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Results for "Rathin Desai"

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Quantifying Error in the Presence of Confounders for Causal InferenceJul 10 2019Estimating average causal effect (ACE) is useful whenever we want to know the effect of an intervention on a given outcome. In the absence of a randomized experiment, many methods such as stratification and inverse propensity weighting have been proposed ... More
GMRT Archive Processing ProjectDec 06 2018The GMRT Online Archive now houses over 120 terabytes of interferometric observations obtained with the GMRT since the observatory began operating as a facility in 2002. The utility of this vast data archive, likely the largest of any Indian telescope, ... More
Abelian Gauge Extension of Standard Model: Dark Matter and Radiative Neutrino MassFeb 13 2012May 04 2012We study a simple extension of Standard Model where the gauge group is extended by an additional $U(1)_X$ gauge symmetry. Neutrino mass arise both at tree level as well as radiatively by the anomaly free addition of one singlet fermion $N_R$ and two triplet ... More
Baryogenesis through R-parity violationAug 02 1996We consider generation of baryon asymmetry of the universe through $R-$parity violation in a scenario in which out-of-equilibrium condition is satisfied by making the electroweak phase transition to be first order. We study all the $R-$parity violating ... More
Baryon Number Violation in Particle DecaysOct 30 2001It has been argued in the past that in baryogenesis via out-of-equilibrium decays one must consider loop diagrams that contain more than one baryon number violating coupling. In this note we argue that the requirement with regard to baryon number violating ... More
Common Radiative Origin of Active and Sterile Neutrino MassesOct 21 2013Jan 08 2014Sterile neutrinos with sub-electron volt (eV) masses have recently received serious attention due to the tantalizing hints from reactor neutrino experiments as well as cosmology. While the nine year old Wilkinson Mass Anisotropy Probe experiment suggests ... More
Discovering $CP$ violation in neutrino oscillation experiment using neutrino beam from electron captureSep 02 2012May 02 2014Considering the recently obtained value of $\theta_{13}$ from Daya Bay and other reactor experiments we have studied the prospects of considering mono-energetic neutrino beam in studying $CP$ violation in the leptonic sector. Using a neutrino beam from ... More
Magic baseline and magic energy in neutrino oscillation with non-standard interactionsApr 06 2010Feb 18 2011We have discussed conditions under which probability of oscillation ($\nu_e\rightarrow \nu_{\mu}$) is independent of CP violating phase $\delta$. The condition of magic baseline on its length is well-known. We have proposed another condition which is ... More
Neutrino oscillation with flavor non-eigenstates and CP-violating Majorana phasesDec 29 2009We analyze neutrino oscillation for the general case when the initial neutrino is not in a pure flavor state. We show that, after such a neutrino beam propagates for a while, the probability of detecting any pure flavor state depends even on the CP-violating ... More
Dark matter mass from relic abundance, extra $U(1)$ Gauge boson and Active-Sterile Neutrino MixingJun 24 2019In a model with extra $U(1)$ gauge to Standard Model gauge group we have shown the allowed region of masses of extra gauge boson and the dark matter which is the lightest one among other right-handed Majorana fermions present in the model. To obtain this ... More
Seesaw Neutrino Mass and New U(1) Gauge SymmetryOct 30 2008Feb 28 2009The three electroweak doublet neutrinos $\nu_{e,\mu,\tau}$ of the Standard Model may acquire small seesaw masses, using either three Majorana fermion singlets $N$ or three Majorana fermion triplets $(\Sigma^+,\Sigma^0,\Sigma^-)$. It is well-known that ... More
Supersymmetric Model of Muon Anomalous Magnetic Moment and Neutrino MassesAug 21 2001We propose the novel lepton-number relationship $L_\tau = L_e + L_\mu$, which is uniquely realized by the interaction $(\hat \nu_e \hat \mu - \hat e \hat \nu_\mu) \hat \tau^c$ in supersymmetry and may account for a possibly large muon anomalous magnetic ... More
Three Inequivalent Mass-Degenerate Majorana Neutrinos and a Model of Their Splitting for Neutrino OscillationsApr 20 2000The mass matrix of three Majorana neutrinos of equal mass is not necessarily proportional to the identity matrix, but expressible in terms of two angles and one phase. We discuss how such a mass matrix may be stable or unstable against radiative corrections. ... More
Common Origin of Active and Sterile Neutrino Masses with Dark MatterNov 17 2014We propose an abelian extension of the Standard Model which can explain the origin of eV scale masses and mixing for active and sterile neutrinos and at the same time providing a natural cold dark matter candidate. One of the three active neutrinos acquires ... More
Discovery reach of $CP$ violation and non-standard interactions in low energy neutrino factoryOct 17 2012Apr 21 2014In low energy neutrino factory ($E_{\mu}< 10$GeV) using MIND detector, we have studied the optimization of $CP$ violation discovery reach in the leptonic sector for different baselines and different parent muon energy considering only Standard Model interactions ... More
Common Origin of 3.55 keV X-Ray Line and Galactic Center Gamma Ray Excess in a Radiative Neutrino Mass ModelMar 20 2015Sep 21 2015We attempt to simultaneously explain the recently observed 3.55 keV X-ray line in the analysis of XMM-Newton telescope data and the galactic center gamma ray excess observed by the Fermi gamma ray space telescope within an abelian gauge extension of standard ... More
Can R-parity violating supersymmetry be seen in long baseline beta-beam experiments?Aug 03 2006Sep 18 2006Long baseline oscillation experiments may well emerge as test beds for neutrino interactions as are present in R-parity violating supersymmetry. We show that flavour diagonal (FDNC) and flavour changing (FCNC) neutral currents arising therefrom prominently ... More
A new three flavor oscillation solution of the solar neutrino deficit in R-parity violating supersymmetryMay 14 2001May 19 2001We present a solution of the solar neutrino deficit using three flavors of neutrinos within the R-parity non-conserving supersymmetric model. In vacuum, mass and mixing is restricted to the nu(mu)-nu(tau) sector only, which we choose in consistency with ... More
New U(1) Gauge Model of Radiative Lepton Masses with Sterile Neutrino and Dark MatterDec 17 2015Feb 22 2016An anomaly-free U(1) gauge extension of the standard model (SM) is presented. Only one Higgs doublet with a nonzero vacuum expectation is required as in the SM. New fermions and scalars as well as all SM particles transform nontrivially under this U(1), ... More
The neutrino mass scale and the mixing angle $θ_{13}$ for quasi-degenerate Majorana neutrinosMar 30 2007Apr 17 2007Considering a general mass matrix for quasi-degenerate neutrinos and treating the experimentally known oscillation parameters as inputs, we study the correlation between the degenerate mass scale $(m)$ and the mixing angle $\theta_{13}$. We find that, ... More
Counting and Enumerating Galled NetworksDec 20 2018Galled trees are widely studied as a recombination model in population genetics. This class of phylogenetic networks is generalized into galled networks by relaxing a structural condition. In this work, a linear recurrence formula is given for counting ... More
Frequentist model comparison tests of sinusoidal variations in measurements of Newton's gravitational constantJul 13 2016Jan 20 2017Anderson et al have claimed to find evidence for periodic sinusoidal variations (period=5.9 years) in measurements of Newton's Gravitational constant. These claims have been disputed by Pitkin. Using Bayesian model comparison, he argues that a model with ... More
Collider signatures for dark matter and long-lived particles with Pythia 8Jul 11 2018We describe the implementation of four models for production of dark matter or as- sociated particles at the LHC based on the simplest extensions of the Standard Model. The first kind of models include dark matter production via s-channel mediators. This ... More
Limit on graviton mass from galaxy cluster Abell 1689Aug 22 2017Jan 19 2018To date, the only limit on graviton mass using galaxy clusters was obtained by Goldhaber and Nieto in 1974, using the fact that the orbits of galaxy clusters are bound and closed, and extend up to 580 kpc. From positing that only a Newtonian potential ... More
Do Pulsar Radio Fluxes violate the Inverse-Square Law?Dec 18 2015Mar 16 2016Singleton et al (2009) have argued that the flux of pulsars measured at 1400 MHz shows an apparent violation of the inverse-square law with distance ($r$), and it is consistent with $1/r$ scaling. They deduced this from the fact that the convergence error ... More
Inner Loop Optimizations in Mapping Single Threaded Programs to HardwareNov 04 2014In the context of mapping high-level algorithms to hardware, we consider the basic problem of generating an efficient hardware implementation of a single threaded program, in particular, that of an inner loop. We describe a control-flow mechanism which ... More
Nonthermal $CP$ violation in soft leptogenesisJan 26 2015May 04 2015Soft leptogenesis is a mechanism which generates the matter-antimatter asymmetry of the Universe via the out-of-equilibrium decays of heavy sneutrinos in which soft supersymmetry breaking terms play two important roles: they provide the required $CP$ ... More
Non-standard interaction in neutrino oscillations and recent Daya Bay, T2K experimentsJan 14 2012Aug 30 2012We study the possible constraints on non-standard interaction(NSIs) in a model independent way by considering the recent results from T2K and Daya Bay neutrino oscillations experiments. Using perturbation method we present generic formulas (suitable for ... More
Spin-$S$ designer hamiltonians and the square lattice $S=1$ Haldane nematicApr 21 2019We introduce a strategy to write down lattice models of spin rotational symmetric Hamiltonians with arbitrary spin-$S$ that are Marshall positive and can be simulated efficiently using world line Monte Carlo methods. As an application of our approach ... More
Median statistics estimate of the neutron lifetimeDec 23 2018We construct the error distributions for the neutron lifetime using a subset of measurements compiled in the 2018 edition of Particle Data Group (PDG), as well as a few recent measurements, which are not yet included in PDG. We then checked the Gaussianity ... More
Bound on the graviton mass from Chandra X-ray cluster sampleNov 23 2018We present new limits on the graviton mass using a sample of 12 relaxed galaxy clusters, for which temperature and gas density profiles were estimated by Vikhlinin et al (astro-ph/0507092) using Chandra X-ray observations. For this purpose, we first calculate ... More
Classification of Gamma-Ray Burst durations using robust model-comparison techniquesDec 25 2016Feb 25 2017Gamma-Ray Bursts (GRBs) have been conventionally bifurcated into two distinct categories dubbed "short" and "long", depending on whether their durations are less than or greater than two seconds respectively. However, many authors have pointed to the ... More
Generalized cofactors and decomposition of Boolean satisfiability problemsDec 07 2014We propose an approach for decomposing Boolean satisfiability problems while extending recent results of \cite{sul2} on solving Boolean systems of equations. Developments in \cite{sul2} were aimed at the expansion of functions $f$ in orthonormal (ON) ... More
The Dynamics of Genetic Draft in Rapidly Adapting PopulationsMay 30 2013The accumulation of beneficial mutations on many competing genetic backgrounds in rapidly adapting populations has a striking impact on evolutionary dynamics. This effect, known as clonal interference, causes erratic fluctuations in the frequencies of ... More
Projective cofactor decompositions of Boolean functions and the satisfiability problemMar 15 2016Given a CNF formula $F$, we present a new algorithm for deciding the satisfiability (SAT) of $F$ and computing all solutions of assignments. The algorithm is based on the concept of \emph{cofactors} known in the literature. This paper is a fallout of ... More
Generalized Lomb-Scargle analysis of $\rm{^{90}Sr/^{90}Y}$ decay rate measurements from the Physikalisch-Technische BundesanstaltJan 10 2018We apply the generalized Lomb-Scargle (LS) periodogram to independently confirm the claim by Sturrock et al (arXiv:1605.03088) of oscillation at a frequency of 11/year in the decay rates of $\rm{^{90}Sr/^{90}Y}$ from measurements at the Physikalisch Technische ... More
Combined homotopy and Galerkin stability analysis of Mathieu-like equationsNov 24 2018We propose homotopy analysis method in combination with Galerkin projections to obtain transition curves of Mathieu-like equations. While constructing homotopy, we think of convergence-control parameter as a function of embedding parameter and call it ... More
Signals of supersymmetry with inaccessible first two families at the Large Hadron ColliderJan 30 2009Jul 28 2009We investigate the signals of supersymmetry (SUSY) in a scenario where only the third family squarks and sleptons can be produced at the Large Hadron Collider (LHC), in addition to the gluino, charginos and neutralinos. The final states in such cases ... More
Separation of pulsar signals from noise with supervised machine learning algorithmsApr 15 2017Feb 10 2018We evaluate the performance of four different machine learning (ML) algorithms: an Artificial Neural Network Multi-Layer Perceptron (ANN MLP ), Adaboost, Gradient Boosting Classifier (GBC), XGBoost, for the separation of pulsars from radio frequency interference ... More
On the Complexity of Newman's Community Finding Approach for Biological and Social NetworksFeb 04 2011Apr 11 2012Given a graph of interactions, a module (also called a community or cluster) is a subset of nodes whose fitness is a function of the statistical significance of the pairwise interactions of nodes in the module. The topic of this paper is a model-based ... More
Damped random walks and the characteristic polynomial of the weighted Laplacian on a graphJun 22 2005Jan 15 2012For $\lambda>0$, we define a $\lambda$-damped random walk to be a random walk that is started from a random vertex of a graph and stopped at each step with probability $\frac{\lambda}{1+\lambda}$, otherwise continued with probability $\frac{1}{1+\lambda}$. ... More
An independent assessment of significance of annual modulation in COSINE-100 dataJul 16 2019We perform an independent search for annual modulation in the recently released COSINE-100 data, which could be induced by dark matter scatterings. We test the hypothesis that the data contains a sinusoidal modulation against the null hypothesis, that ... More
On a Connection Between Small Set Expansions and Modularity Clustering in Social NetworksNov 13 2011Feb 11 2014In this paper we explore a connection between two seemingly different problems from two different domains: the small-set expansion problem studied in unique games conjecture, and a popular community finding approach for social networks known as the modularity ... More
Projective cofactor decompositions of Boolean functions and the satisfiability problemMar 15 2016May 08 2017Given a CNF formula $F$, we present a new algorithm for deciding the satisfiability (SAT) of $F$ and computing all solutions of assignments. The algorithm is based on the concept of \emph{cofactors} known in the literature. This paper is a fallout of ... More
Generalized Lomb-Scargle analysis of $\rm{^{90}Sr/^{90}Y}$ decay rate measurements from the Physikalisch-Technische BundesanstaltJan 10 2018Jul 02 2018We apply the generalized Lomb-Scargle (LS) periodogram to independently confirm the claim by Sturrock et al (arXiv:1605.03088) of oscillation at a frequency of 11/year in the decay rates of $\rm{^{90}Sr/^{90}Y}$ from measurements at the Physikalisch Technische ... More
Natural response of non-smooth oscillators using homotopy analysis combined with Galerkin projectionsNov 24 2018We propose homotopy analysis method in combination with Galerkin projections to approximate the natural response of non-smooth oscillators with discontinuities of type Heaviside, signum, modulus etc. While constructing the homotopy, we think of convergence-control ... More
Light neutrinos from massless texture and below TeV seesaw scaleApr 28 2010Aug 07 2011We present general conditions on Dirac and Majorana mass terms under which a type-I seesaw mechanism can lead to three exactly massless neutrinos at the tree level. We depict several examples where the conditions are satisfied and relate some of them ... More
Do tau lepton branching fractions obey Benford's law?Sep 28 2017May 04 2018According to Benford's law, the most significant digit in many datasets is not uniformly distributed, but obeys a well defined power law distribution with smaller digits appearing more often. Among one of the myriad particle physics datasets available, ... More
Constraints on supersymmetry with light third family from LHC dataNov 11 2011Oct 03 2012We present a re-interpretation of the recent ATLAS limits on supersymmetry in channels with jets (with and without b-tags) and missing energy, in the context of light third family squarks, while the first two squark families are inaccessible at the 7 ... More
Limit on graviton mass using stacked galaxy cluster catalogs from SPT-SZ, Planck-SZ and SDSS-redMaPPerSep 29 2018In the last few years, there has been a resurgence of interest in obtaining observational bounds on the graviton mass, following the detection of gravitational waves, because of the versatility of massive graviton theories in resolving multiple problems ... More
Statistical Significance of spectral lag transition in GRB 160625BJun 05 2017Jul 30 2017Recently Wei et al (arXiv:1612.09425) have found evidence for a transition from positive time lags to negative time lags in the spectral lag data of GRB 160625B. They have fit these observed lags to a sum of two components: an assumed functional form ... More
Pattern Formation in Laser Induced MeltingDec 23 1993A laser focussed onto a semiconductor film can create a disordered lamellae pattern of coexisting molten-solid regions. We present a continuum model based on the higher reflectivity of the molten regions. For large latent heat, this model becomes equivalent ... More
Non-Gaussian Error Distributions of Galactic Rotation Speed MeasurementsOct 18 2017Feb 20 2018We construct the error distributions for the galactic rotation speed ($\Theta_0$) using 137 data points from measurements compiled in De Grijs et al. (arXiv:1709.02501), with all observations normalized to the galactocentric distance of 8.3 kpc. We then ... More
R-parity violating resonant stop production at the Large Hadron ColliderFeb 11 2010Sep 20 2010We have investigated the resonant production of a stop at the Large Hadron Collider, driven by baryon number violating interactions in supersymmetry. We work in the framework of minimal supergravity models with the lightest neutralino being the lightest ... More
Median statistics estimates of Hubble and Newton's ConstantJan 07 2017Jan 10 2017Robustness of any statistics depends upon the number of assumptions it makes about the measured data. We point out the advantages of median statistics using toy numerical experiments and demonstrate its robustness, when the number of assumptions we can ... More
Bound on the graviton mass from Chandra X-ray cluster sampleNov 23 2018Mar 28 2019We present new limits on the graviton mass using a sample of 12 relaxed galaxy clusters, for which temperature and gas density profiles were derived by Vikhlinin et al (astro-ph/0507092) using Chandra X-ray observations. These limits can be converted ... More
On Cycles in Random GraphsSep 30 2010We consider the geometric random (GR) graph on the $d-$dimensional torus with the $L_\sigma$ distance measure ($1 \leq \sigma \leq \infty$). Our main result is an exact characterization of the probability that a particular labeled cycle exists in this ... More
Classifying Exoplanets with Gaussian Mixture ModelAug 02 2017Jun 01 2018Recently, Odrzywolek and Rafelski (arXiv:1612.03556) have found three distinct categories of exoplanets, when they are classified based on density. We first carry out a similar classification of exoplanets according to their density using the Gaussian ... More
Baryogenesis in a supersymmetric model without R-parityOct 02 1996We propose a simple scenario for baryogenesis in supersymmetric models where baryon number is broken alongwith R-parity. The lightest supersymmetric particle (neutralino) decays to three quarks and $CP-$ violation comes from interference of tree and one ... More
TeV scale Leptogenesis from decay of next to lightest NeutralinoFeb 08 2016We show that in $R$-parity violating Minimal Supersymmetric Standard Model (MSSM), both TeV scale leptogenesis and sub-eV neutrino mass are possible after considering three body decay of next to lightest neutralino with only first order lepton number ... More
A Hybrid Classification Algorithm to Classify Engineering Students' Problems and PerksApr 08 2016The social networking sites have brought a new horizon for expressing views and opinions of individuals. Moreover, they provide medium to students to share their sentiments including struggles and joy during the learning process. Such informal information ... More
Supersymmetry and Generic BSM Models in PYTHIA 8Sep 27 2011Jun 28 2012We describe the implementation of supersymmetric models in PYTHIA 8, including production and decay of superparticles and allowing for violation of flavour, CP, and R-parity. We also present a framework for importing generic new-physics matrix elements ... More
Non-parametric reconstruction of an inflaton potential from Einstein-Cartan-Sciama-Kibble gravity with particle productionOct 18 2015The coupling between spin and torsion in the Einstein-Cartan-Sciama-Kibble theory of gravity generates gravitational repulsion at very high densities, which prevents a singularity in a black hole and may create there a new universe. We show that quantum ... More
Insights from the Wikipedia Contest (IEEE Contest for Data Mining 2011)Jan 07 2014The Wikimedia Foundation has recently observed that newly joining editors on Wikipedia are increasingly failing to integrate into the Wikipedia editors' community, i.e. the community is becoming increasingly harder to penetrate. To sustain healthy growth ... More
Steady-states and kinetics of ordering in bus-route models: connection with the Nagel-Schreckenberg modelMar 13 2000A Bus Route Model (BRM) can be defined on a one-dimensional lattice, where buses are represented by "particles" that are driven forward from one site to the next with each site representing a bus stop. We replace the random sequential updating rules in ... More
Optimal properties of the canonical tight probabilistic frameMay 09 2017A probabilistic frame is a Borel probability measure with finite second moment whose support spans $\mathbb{R}^d$. A Parseval probabilistic frame is one for which the associated matrix of the second moments is the identity matrix in $\mathbb{R}^d$. Each ... More
Associating vectors in $\CC^n$ with rank 2 projections in $\RR^{2n}$: with applicationsMar 08 2017We will see that vectors in $\CC^n$ have natural analogs as rank 2 projections in $\RR^{2n}$ and that this association transfers many vector properties into properties of rank two projections on $\RR^{2n}$. We believe that this association will answer ... More
Curvature autocorrelations in domain growth dynamicsApr 22 1998Oct 29 1999We show how the interface curvature autocorrelation function (ICAF) and associated structure factor (ICSF), of relevance in non-equilibrium pattern-formation problems where sharp interfaces are present, provide new and interesting information on domain ... More
Kinetics of phase ordering on curved surfacesApr 22 1998Nov 09 1999An interface description and numerical simulations of model A kinetics are used for the first time to investigate the intra-surface kinetics of phase ordering on corrugated surfaces. Geometrical dynamical equations are derived for the domain interfaces. ... More
A search for evidence of solar rotation in Super-Kamiokande solar neutrino datasetApr 22 2016Jun 06 2016We apply the generalized Lomb-Scargle (LS) periodogram, proposed by Zechmeister and Kurster, to the solar neutrino data from Super-Kamiokande (Super-K) using data from its first five years. For each peak in the LS periodogram, we evaluate the statistical ... More
Constraints on frequency-dependent violations of Shapiro delay from GW150914Feb 15 2016Mar 16 2016On 14th September 2015, a transient gravitational wave (GW150914) was detected by the two LIGO detectors at Hanford and Livingston from the coalescence of a binary black hole system located at a distance of about 400 Mpc. We point out that GW150914 experienced ... More
Spin-$S$ designer hamiltonians and the square lattice $S=1$ Haldane nematicApr 21 2019May 29 2019We introduce a strategy to write down lattice models of spin rotational symmetric Hamiltonians with arbitrary spin-$S$ that are Marshall positive and can be simulated efficiently using world line Monte Carlo methods. As an application of our approach ... More
Exploiting Uncertainty of Loss Landscape for Stochastic OptimizationMay 30 2019We introduce novel variants of momentum by incorporating the variance of the stochastic loss function. The variance characterizes the confidence or uncertainty of the local features of the averaged loss surface across the i.i.d. subsets of the training ... More
Galactic Shapiro Delay to the Crab Pulsar and limit on Einstein's Equivalence PrincipleDec 08 2016We calculate the total galactic Shapiro delay to the Crab pulsar by including the contributions from the dark matter as well as baryonic matter along the line of sight. The total delay due to dark matter potential is about 3.4 days. For baryonic matter, ... More
Galactic Shapiro Delay to the Crab Pulsar and limit on Einstein's Equivalence Principle ViolationDec 08 2016Jan 17 2018We calculate the total galactic Shapiro delay to the Crab pulsar by including the contributions from the dark matter as well as baryonic matter along the line of sight. The total delay due to dark matter potential is about 3.4 days. For baryonic matter, ... More
The Galactic One-Way Shapiro Delay to PSR B1937+21Oct 28 2015Apr 18 2016The time delay experienced by a light ray as it passes through a changing gravitational potential by a non-zero mass distribution along the line of sight is usually referred to as Shapiro delay. Shapiro delay has been extensively measured in the Solar ... More
On Continuous-space Embedding of Discrete-parameter Queuing SystemsJun 09 2016We consider the problem of embedding a discrete parameter queueing system into continuous space by using simulation-based interpolation. We first show that a discrete-time Geom/Geom/1 queue with service time $T$ can be exactly simulated by making the ... More
The impact of macroscopic epistasis on long-term evolutionary dynamicsAug 18 2014Nov 13 2014Genetic interactions can strongly influence the fitness effects of individual mutations, yet the impact of these epistatic interactions on evolutionary dynamics remains poorly understood. Here we investigate the evolutionary role of epistasis over 50,000 ... More
Stress-driven instability in growing multilayer filmsJul 29 2002Jan 02 2003We investigate the stress-driven morphological instability of epitaxially growing multilayer films, which are coherent and dislocation-free. We construct a direct elastic analysis, from which we determine the elastic state of the system recursively in ... More
Next-to-minimal dark matter at the LHCApr 06 2018Jul 11 2018We examine the collider signatures of a WIMP dark matter scenario comprising a singlet fermion and an SU(2) n-plet fermion, with a focus on n=3 and n=5. The singlet and n-plet masses are of the order of the electroweak scale. The n-plet contains new charged ... More
Social Data Analysis: A Study on Friend Rating InfluenceFeb 24 2017Social Networking accounts for a significant chunk of interest among various online activities~\cite{smith2009social}. The proclivity of being social, online, has been ingrained in us so much that we are actively producing content for the rest of the ... More
Estimation of treatment effects following a sequential trial of multiple treatmentsJun 26 2019When a clinical trial is subject to a series of interim analyses as a result of which the study may be terminated or modified, final frequentist analyses need to take account of the design used. Failure to do so may result in overstated levels of significance, ... More
Variational Inference as an alternative to MCMC for parameter estimation and model selectionMar 17 2018Jun 20 2018Most applications of Bayesian Inference for parameter estimation and model selection in astrophysics involve the use of Markov Chain Monte Carlo (MCMC) techniques. In this work, we introduce Variational Inference as an alternative to solve these problems, ... More
Deleterious passengers in adapting populationsMay 15 2014Most new mutations are deleterious and are eventually eliminated by natural selection. But in an adapting population, the rapid amplification of beneficial mutations can hinder the removal of deleterious variants in nearby regions of the genome, altering ... More
The equivalence between weak and strong purifying selectionOct 16 2012Weak purifying selection, acting on many linked mutations, may play a major role in shaping patterns of molecular evolution in natural populations. Yet efforts to infer these effects from DNA sequence data are limited by our incomplete understanding of ... More
Nonlinear Bias and the Convective Fisher EquationMar 07 1994We combine random walks, growth and decay, and convection, in a Monte Carlo simulation to model 1D interface dynamics with fluctuations. The continuum limit corresponds to the deterministic Fisher equation with convection. We find qualitatively the same ... More
Beneficial mutation-selection balance and the effect of linkage on positive selectionDec 11 2006When beneficial mutations are rare, they accumulate by a series of selective sweeps. But when they are common, many beneficial mutations will occur before any can fix, so there will be many different mutant lineages in the population concurrently. In ... More
Charge ordering and self-assembled nanostructures in a fcc Coulomb lattice gasJan 06 2015The compositional ordering of Ag, Pb, Sb, Te ions in (AgSbTe$_{2}$)$_{x}$(PbTe)$_{2(1-x)}$ systems possessing a NaCl structure is studied using a Coulomb lattice gas (CLG) model on a face-centered cubic (fcc) lattice and Monte Carlo simulations. Our results ... More
Multimodel Response Assessment for Monthly Rainfall Distribution in Some Selected Indian Cities Using Best Fit Probability as a ToolAug 10 2017Aug 09 2018We carry out a study of the statistical distribution of rainfall precipitation data for 20 cites in India. We have determined the best-fit probability distribution for these cities from the monthly precipitation data spanning 100 years of observations ... More
A Probabilistic Proof of the Perron-Frobenius TheoremAug 15 2018The Perron-Frobenius theorem plays an important role in many areas of management science and operations research. This paper provides a probabilistic perspective on the theorem, by discussing a proof that exploits a probabilistic representation of the ... More
Neutron-induced strike: Study of multiple node charge collection in 14nm FinFETsJun 11 2017FinFETs have replaced the conventional bulk CMOS transistors in the sub-20nm technology. One of the key issues to consider is, the vulnerability of FinFET based circuits to multiple node charge collection due to neutron-induced strikes. In this paper, ... More
An explicit reconstruction algorithm for the transverse ray transform of a second rank tensor field from three axis dataNov 17 2015We give an explicit plane-by-plane filtered back-projection reconstruction algorithm for the transverse ray transform of symmetric second rank tensor fields on Euclidean 3-space, using data from rotation about three orthogonal axes. We show that in the ... More
Epitaxial growth in dislocation-free strained alloy films: Morphological and compositional instabilitiesMay 23 2002The mechanisms of stability or instability in the strained alloy film growth are of intense current interest to both theorists and experimentalists. We consider dislocation-free, coherent, growing alloy films which could exhibit a morphological instability ... More
Constraints on differential Shapiro delay between neutrinos and photons from IceCube-170922AJul 13 2018Feb 19 2019On 22nd September 2017, the IceCube Collaboration detected a neutrino with energy of about 290 TeV from the direction of the gamma-ray blazar TXS 0506+056, located at a distance of about 1.75 Gpc. During the same time, enhanced gamma-ray flaring was also ... More
Role of Temporal Diversity in Inferring Social Ties Based on Spatio-Temporal DataNov 10 2016The last two decades have seen a tremendous surge in research on social networks and their implications. The studies includes inferring social relationships, which in turn have been used for target advertising, recommendations, search customization etc. ... More
An updated analysis of radion-higgs mixing in the light of LHC dataJul 14 2013We explore the constraints on the parameter space of a Randall-Sundrum warped geometry scenario, where a radion field arises out of the attempt to stabilise the radius of the extra compact spacelike dimension, using the most recent data from higgs searches ... More
Production of a Higgs pseudoscalar plus two jets in hadronic collisionsAug 10 1998We consider the production of a Higgs pseudoscalar accompanied by two jets in hadronic collisions. We work in the limit that the top quark is much heavier than the Higgs pseudoscalar and use an effective Lagrangian for the interactions of gluons with ... More
Bounds on the decay of the auto-correlation in phase ordering dynamicsSep 24 1994We obtain bounds on the decay exponent lambda of the autocorrelation function in phase ordering dynamics. For non-conserved order parameter, we recover the Fisher and Huse inequality, lambda > = d/2. If the order parameter is conserved we also find lambda ... More
Imprints of r-process heating on fall-back accretion: distinguishing black hole-neutron star from double neutron star mergersDec 11 2018Dec 14 2018Mergers of compact binaries containing two neutron stars (NS-NS), or a neutron star and a stellar-mass black hole (NS-BH), are likely progenitors of short-duration gamma ray bursts (SGRBs). A fraction >20% of SGRBs are followed by temporally-extended ... More
Constraints on invisible Higgs decay in MSSM in the light of diphoton rates from the LHCFeb 23 2012We examine the parameter space of the purely phenomenological minimal super- symmetric standard model (MSSM), without assuming any supersymmetry breaking scheme. We find that a large region of the parameter space can indeed yield the lightest neutral ... More