Results for "Soumyabrata Dev"

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Systematic study of color spaces and components for the segmentation of sky/cloud imagesJan 17 2017Sky/cloud imaging using ground-based Whole Sky Imagers (WSI) is a cost-effective means to understanding cloud cover and weather patterns. The accurate segmentation of clouds in these images is a challenging task, as clouds do not possess any clear structure. ... More
TEST: A Terminology Extraction System for Technology Related TermsDec 22 2018Mar 07 2019Tracking developments in the highly dynamic data-technology landscape are vital to keeping up with novel technologies and tools, in the various areas of Artificial Intelligence (AI). However, It is difficult to keep track of all the relevant technology ... More
High-Dynamic-Range Imaging for Cloud SegmentationMar 02 2018Sky/cloud images obtained from ground-based sky-cameras are usually captured using a fish-eye lens with a wide field of view. However, the sky exhibits a large dynamic range in terms of luminance, more than a conventional camera can capture. It is thus ... More
Predicting GPS-based PWV Measurements Using Exponential SmoothingMar 15 2019Global Positioning System (GPS) derived precipitable water vapor (PWV) is extensively being used in atmospheric remote sensing for applications like rainfall prediction. Many applications require PWV values with good resolution and without any missing ... More
Study of Clear Sky Models for SingaporeAug 24 2017The estimation of total solar irradiance falling on the earth's surface is important in the field of solar energy generation and forecasting. Several clear-sky solar radiation models have been developed over the last few decades. Most of these models ... More
Multi-label Cloud Segmentation Using a Deep NetworkMar 15 2019Different empirical models have been developed for cloud detection. There is a growing interest in using the ground-based sky/cloud images for this purpose. Several methods exist that perform binary segmentation of clouds. In this paper, we propose to ... More
WAHRSIS: A Low-cost, High-resolution Whole Sky Imager With Near-Infrared CapabilitiesMay 21 2016Apr 19 2017Cloud imaging using ground-based whole sky imagers is essential for a fine-grained understanding of the effects of cloud formations, which can be useful in many applications. Some such imagers are available commercially, but their cost is relatively high, ... More
Analyzing Solar Irradiance Variation From GPS and CamerasApr 19 2018The total amount of solar irradiance falling on the earth's surface is an important area of study amongst the photo-voltaic (PV) engineers and remote sensing analysts. The received solar irradiance impacts the total amount of generated solar energy. However, ... More
Correlating Satellite Cloud Cover with Sky CamerasAug 24 2017The role of clouds is manifold in understanding the various events in the atmosphere, and also in studying the radiative balance of the earth. The conventional manner of such cloud analysis is performed mainly via satellite images. However, because of ... More
CloudSegNet: A Deep Network for Nychthemeron Cloud Image SegmentationApr 16 2019We analyze clouds in the earth's atmosphere using ground-based sky cameras. An accurate segmentation of clouds in the captured sky/cloud image is difficult, owing to the fuzzy boundaries of clouds. Several techniques have been proposed that use color ... More
Systematic Study of Weather Variables for Rainfall DetectionMay 04 2018Numerous weather parameters affect the occurrence and amount of rainfall. Therefore, it is important to study these parameters and their interdependency. In this paper, different weather and time-related variables -- relative humidity, solar radiation, ... More
A Data-Driven Approach for Accurate Rainfall PredictionJul 10 2019In recent years, there has been growing interest in using Precipitable Water Vapor (PWV) derived from Global Positioning System (GPS) signal delays to predict rainfall. However, the occurrence of rainfall is dependent on a myriad of atmospheric parameters. ... More
A Potential Low Cost Remote Sensing Using GPS Derived PWVMay 04 2018In this paper, the Precipitable Water Vapor (PWV) content of the atmosphere is derived using the Global Positioning System (GPS) signal delays. The PWV values from GPS are calculated at different elevation cut-off angles. It was found that the significant ... More
The ALOS Dataset for Advert Localization in Outdoor ScenesApr 16 2019The rapid increase in the number of online videos provides the marketing and advertising agents ample opportunities to reach out to their audience. One of the most widely used strategies is product placement, or embedded marketing, wherein new advertisements ... More
An Advert Creation System for Next-Gen PublicityAug 01 2018With the rapid proliferation of multimedia data in the internet, there has been a fast rise in the creation of videos for the viewers. This enables the viewers to skip the advertisement breaks in the videos, using ad blockers and 'skip ad' buttons -- ... More
Color-based Segmentation of Sky/Cloud Images From Ground-based CamerasJun 12 2016Sky/cloud images captured by ground-based cameras (a.k.a. whole sky imagers) are increasingly used nowadays because of their applications in a number of fields, including climate modeling, weather prediction, renewable energy generation, and satellite ... More
Estimation of solar irradiance using ground-based whole sky imagersJun 08 2016Ground-based whole sky imagers (WSIs) can provide localized images of the sky of high temporal and spatial resolution, which permits fine-grained cloud observation. In this paper, we show how images taken by WSIs can be used to estimate solar radiation. ... More
WAHRSIS: A Low-cost, High-resolution Whole Sky Imager With Near-Infrared CapabilitiesMay 21 2016Cloud imaging using ground-based whole sky imagers is essential for a fine-grained understanding of the effects of cloud formations, which can be useful in many applications. Some such imagers are available commercially, but their cost is relatively high, ... More
Short-term prediction of localized cloud motion using ground-based sky imagersOct 21 2016Fine-scale short-term cloud motion prediction is needed for several applications, including solar energy generation and satellite communications. In tropical regions such as Singapore, clouds are mostly formed by convection; they are very localized, and ... More
Nighttime sky/cloud image segmentationMay 30 2017Imaging the atmosphere using ground-based sky cameras is a popular approach to study various atmospheric phenomena. However, it usually focuses on the daytime. Nighttime sky/cloud images are darker and noisier, and thus harder to analyze. An accurate ... More
Rough Set Based Color Channel SelectionNov 03 2016Color channel selection is essential for accurate segmentation of sky and clouds in images obtained from ground-based sky cameras. Most prior works in cloud segmentation use threshold based methods on color channels selected in an ad-hoc manner. In this ... More
On the Importance of PWV in Detecting PrecipitationApr 19 2018With a rapid increase in the number of geostationary satellites around the earth's orbit, there has been a renewed interest in using Global Positioning System (GPS) to understand several phenomenon in earth's atmosphere. Such study using GPS devices are ... More
Design of low-cost, compact and weather-proof whole sky imagers for high-dynamic-range capturesApr 19 2017Ground-based whole sky imagers are popular for monitoring cloud formations, which is necessary for various applications. We present two new Wide Angle High-Resolution Sky Imaging System (WAHRSIS) models, which were designed especially to withstand the ... More
Analyzing Cloud Optical Properties Using Sky CamerasAug 24 2017Clouds play a significant role in the fluctuation of solar radiation received by the earth's surface. It is important to study the various cloud properties, as it impacts the total solar irradiance falling on the earth's surface. One of such important ... More
Detecting Rainfall Onset Using Sky ImagesOct 21 2016Ground-based sky cameras (popularly known as Whole Sky Imagers) are increasingly used now-a-days for continuous monitoring of the atmosphere. These imagers have higher temporal and spatial resolutions compared to conventional satellite images. In this ... More
Machine Learning Techniques and Applications For Ground-based Image AnalysisJun 09 2016Ground-based whole sky cameras have opened up new opportunities for monitoring the earth's atmosphere. These cameras are an important complement to satellite images by providing geoscientists with cheaper, faster, and more localized data. The images captured ... More
Estimation of solar irradiance using ground-based whole sky imagersJun 08 2016Apr 06 2017Ground-based whole sky imagers (WSIs) can provide localized images of the sky of high temporal and spatial resolution, which permits fine-grained cloud observation. In this paper, we show how images taken by WSIs can be used to estimate solar radiation. ... More
Towards Timelike Singularity via AdS DualOct 18 2016Jul 05 2017It is well known that Kasner geometry with space-like singularity can be extended to bulk AdS-like geometry, furthermore one can study field theory on this Kasner space via its gravity dual. In this paper, we show that there exists a Kasner-like geometry ... More
Koszul duality in algebraic topology - an historical perspectiveJan 12 2010We survey the topology which led to the original bar and cobar constructions, for both associative algebras and coalgebras and for Lie algebras and commutative coalgebras. These constructions are often viewed as part of the larger theory of Koszul duality ... More
The geometry of the local cohomology filtration in equivariant bordismDec 04 2001Local cohomology techniques in equivariant homotopy theory, introduced by John Greenlees, may be applied to understand homology of classifying spaces through other equivariant data. In this paper we relate the local cohomology filtration to the families ... More
Towards Timelike Singularity via AdS DualOct 18 2016It is well known that Kasner geometry with spacelike singularity can be extended to bulk AdS-like geometry, furthermore one can study field theory on this Kasner space via its gravity dual. In this paper, we show that there exists a Kasner-like geometry ... More
Transversality Obstructions and Equivariant Bordism for G=Z/2Oct 05 1999In this paper we compute homotopical equivariant bordism for the group ${\bf Z/2}$, namely $MO^{\bf Z/2}$, geometric equivariant bordism $\Omega^{\bf Z/2}_*$, and their quotient as modules over geometric bordism. This quotient is a module of stable transversality ... More
The homology of the little disks operadOct 06 2006Feb 20 2010In this expository paper we give an elementary, hands-on computation of the homology of the little disks operad, showing that the homology of a $d-fold loop space is a Poisson algebra. One aim is to familiarize a greater audience with Euclidean configuration ... More
Manifold theoretic compactifications of configuration spacesJun 26 2003Jul 06 2004We present new definitions for and give a comprehensive treatment of the canonical compactification of configuration spaces due to Fulton-MacPherson and Axelrod-Singer in the setting of smooth manifolds, as well as a simplicial variant of this compactification ... More
Operads and knot spacesJul 03 2004Feb 23 2007We show that the Kontsevich operad, as an operad with multiplication, provides a model for the Taylor tower of the functor defined by taking the homotopy fiber of the inclusion of embeddings of an interval in a cube to the corresponding space of immersions. ... More
Computations of Complex Equivariant Bordism RingsOct 05 1999In this paper we compute homotopical bordism rings $MU^G_*$ for abelian compact Lie groups G, giving explicit generators and relations. The key constructions are operations on equivariant bordism which should play an important role in equivariant stable ... More
Prime Power Divisibility,Periodicity and Other Properties of Some Second Order RecurrencesSep 13 2015Sep 30 2015Wall published a paper in 1960 on the Fibonacci sequence where he derived many results concerning the period and prime power divisibility modulo m. His periodicity results have been generalized to second order linear recurrences. Here we study the sequences ... More
Interlinking Heterogeneous Data for Smart Energy SystemsJul 05 2019Smart energy systems in general, and solar energy analysis in particular, have recently gained increasing interest. This is mainly due to stronger focus on smart energy saving solutions and recent developments in photovoltaic (PV) cells. Various data-driven ... More
Polynomials and Second Order Linear RecurrencesAug 23 2016Sep 09 2016One of the most interesting results of the last century was the proof completed by Matijasevich that computably enumerable sets are precisely the diophantine sets [MRDP Theorem, 9], thus settling, based on previously developed machinery, Hilbert's question ... More
Solar Irradiance Forecasting Using Triple Exponential SmoothingJul 16 2018Owing to the growing concern of global warming and over-dependence on fossil fuels, there has been a huge interest in last years in the deployment of Photovoltaic (PV) systems for generating electricity. The output power of a PV array greatly depends, ... More
Cloud Radiative Effect Study Using Sky CameraMar 15 2017The analysis of clouds in the earth's atmosphere is important for a variety of applications, viz. weather reporting, climate forecasting, and solar energy generation. In this paper, we focus our attention on the impact of cloud on the total solar irradiance ... More
A Data-driven Approach to Detecting Precipitation from Meteorological Sensor DataMay 04 2018Precipitation is dependent on a myriad of atmospheric conditions. In this paper, we study how certain atmospheric parameters impact the occurrence of rainfall. We propose a data-driven, machine-learning based methodology to detect precipitation using ... More
The CASE Dataset of Candidate Spaces for Advert ImplantationMar 21 2019With the advent of faster internet services and growth of multimedia content, we observe a massive growth in the number of online videos. The users generate these video contents at an unprecedented rate, owing to the use of smart-phones and other hand-held ... More
Anisotropic Stars II : StabilityMar 20 2003We investigate the stability of self-gravitating spherically symmetric anisotropic spheres under radial perturbations. We consider both the Newtonian and the full general-relativistic perturbation treatment. In the general-relativistic case, we extend ... More
Two-Zero Symmetric Neutrino Mass Matrices in Minimal Supersymmetric SO(10)Jan 14 2008The phenomenological neutrino mass matrix for two-zero symmetric texture has been obtained and used to rule out all possible two-zero symmetric neutrino mass matrices obtained from Yukawa couplings to $\mathbf{10}$ and $\mathbf{126}$ Higgs representations ... More
Improving Style Similarity Metrics of 3D ShapesDec 30 2015The idea of style similarity metrics has been recently developed for various media types such as 2D clip art and 3D shapes. We explore this style metric problem and improve existing style similarity metrics of 3D shapes in four novel ways. First, we consider ... More
Spectral Distortions at Super-KamiokandeJul 17 2006Nov 21 2006We examine the effect of the rise in the survival probability of the electron neutrinos with the decrease in the neutrino energy on the recoil electron spectrum at Super-Kamiokande.
Constraints on Weakly Mixed Sterile Neutrinos in the Light of SNO Salt Phase and 766.3 Ty KamLAND DataApr 26 2005The possibility of flavor transitions into sterile neutrinos (accompanying the dominant LMA transitions) in the solar boron neutrino flux has been examined in a scenario proposed by Hollanda and Smirnov to overcome some generic problems of the pure LMA ... More
Bias-Variance Techniques for Monte Carlo Optimization: Cross-validation for the CE MethodOct 06 2008In this paper, we examine the CE method in the broad context of Monte Carlo Optimization (MCO) and Parametric Learning (PL), a type of machine learning. A well-known overarching principle used to improve the performance of many PL algorithms is the bias-variance ... More
Fox-Neuwirth cell structures and the cohomology of symmetric groupsOct 18 2011Aug 10 2012We use the Fox-Neuwirth cell structure for one-point compactifications of configuration spaces as the starting point for understanding our recent calculation of the mod-two cohomology of symmetric groups. We then use that calculation to give short proofs ... More
Signatures of Supersymmetry in Neutrino TelescopesJun 05 2019We review the prospects of probing $R$-parity violating Supersymmetry (RPV SUSY) at neutrino telescopes using some of the highest energy particles given to us by Nature. The presence of RPV interactions involving ultra-high energy neutrinos with Earth-matter ... More
Localizing Adverts in Outdoor ScenesMay 06 2019Online videos have witnessed an unprecedented growth over the last decade, owing to wide range of content creation. This provides the advertisement and marketing agencies plethora of opportunities for targeted advertisements. Such techniques involve replacing ... More
ADNet: A Deep Network for Detecting AdvertsNov 09 2018Online video advertising gives content providers the ability to deliver compelling content, reach a growing audience, and generate additional revenue from online media. Recently, advertising strategies are designed to look for original advert(s) in a ... More
Anisotropic Stars: Exact SolutionsDec 12 2000We study the effects of anisotropic pressure on the properties of spherically symmetric, gravitationally bound objects. We consider the full general relativistic treatment of this problem and obtain exact solutions for various form of equations of state ... More
Anisotropic Stars: Exact Solutions and StabilityJan 26 2004I report on recent work concerning the existence and stability of self-gravitating spheres with anisotropic pressure. After presenting new exact solutions, Chandrasekhar's variational formalism for radial perturbations is generalized to anisotropic objects ... More
Bordism of semi-free S^1 actionsMar 07 2003Mar 18 2004We calculate geometric and homotopical (or stable) bordism rings associated to semi-free $S^1$ actions on complex manifolds, giving explicit generators for the geometric theory. The classification of semi-free actions with isolated fixed points up to ... More
Leptogenesis in a Hybrid Texture Neutrino Mass ModelMay 25 2010We investigate the CP asymmetry for a hybrid texture of the neutrino mass matrix predicted by $Q_8$ family symmetry in the context of the type-I seesaw mechanism and examine its consequences for leptogenesis. We, also, calculate the resulting Baryon Asymmetry ... More
The CASE Dataset of Candidate Spaces for Advert ImplantationMar 21 2019Apr 29 2019With the advent of faster internet services and growth of multimedia content, we observe a massive growth in the number of online videos. The users generate these video contents at an unprecedented rate, owing to the use of smart-phones and other hand-held ... More
Do quantum fluctuations stabilize an inverted pendulum? A dynamical system studyApr 01 2019We explore analytically the quantum dynamics of a point mass pendulum using the Heisenberg equation of motion. Choosing as variables the mean position of the pendulum, a suitably defined generalised variance and a generalised skewness, we set up a dynamical ... More
Quantum fluctuations stabilize an inverted pendulumApr 01 2019May 08 2019We explore analytically the quantum dynamics of a point mass pendulum using the Heisenberg equation of motion. Choosing as variables the mean position of the pendulum, a suitably defined generalised variance and a generalised skewness, we set up a dynamical ... More
Charged Vaidya Solution Satisfies Weak Energy ConditionDec 08 2015Jun 20 2016The external matter stress-tensor supporting charged Vaidya solution appears to violate weak energy condition in certain region of the spacetime. Motivated by this, a new interpretation of charged Vaidya solution was proposed by Ori [1] in which the energy ... More
A pairing between graphs and treesFeb 25 2005Oct 09 2006We develop a canonical pairing between trees and graphs, which passes to their quotients by Jacobi identities. This pairing is an effective and simple tool for understanding the Lie and Poisson operads, providing canonical duals. In the course of showing ... More
Attenuating Bias in Word VectorsJan 23 2019Word vector representations are well developed tools for various NLP and Machine Learning tasks and are known to retain significant semantic and syntactic structure of languages. But they are prone to carrying and amplifying bias which can perpetrate ... More
Lie coalgebras and rational homotopy theory II: Hopf invariantsSep 29 2008May 23 2011We give a new solution of the "homotopy periods" problem, as highlighted by Sullivan, which places explicit geometrically meaningful formulae first dating back to Whitehead in the context of Quillen's formalism for rational homotopy theory and Koszul-Moore ... More
TeV Scale LeptogenesisJun 02 2015This is a mini-review on the mechanism of leptogenesis, with a special emphasis on low-scale leptogenesis models which are testable in foreseeable laboratory experiments at Energy and Intensity frontiers. We also stress the importance of flavor effects ... More
Neutrino Parameter Space for a Vanishing $ee$ Element in the Neutrino Mass MatrixJul 05 2006May 24 2007The consequences of a texture zero at the $ee$ entry of neutrino mass matrix in the flavor basis, which also implies a vanishing effective Majorana mass for neutrinoless double beta decay, have been studied for Majorana neutrinos. The neutrino parameter ... More
Constraints on the Neutrino Parameters from the `Rise-up' in the Boron Neutrino Spectrum at Low EnergiesSep 28 2004The rise-up in boron neutrino spectrum at low energies has been studied within the framework of `pure LMA' scenario. Indirect bounds on the spectral `upturn' have been obtained from the available solar neutrino data. These bounds have been used to demonstrate ... More
Progressions of reasoning in K-12 mathematicsDec 31 2018We present a research mathematician's perspective on current developments around in K-12 mathematics. We share activities, and highlight the different ways in which students' reasoning can progress, such as amount of abstraction, sophistication of representation, ... More
Bias-Variance Tradeoffs: Novel ApplicationsOct 06 2008We present several applications of the bias-variance decomposition, beginning with straightforward Monte Carlo estimation of integrals, but progressing to the more complex problem of Monte Carlo Optimization (MCO), which involves finding a set of parameters ... More
The topology of spaces of knotsFeb 27 2002Mar 16 2009We present two models for the space of knots which have endpoints at fixed boundary points in a manifold with boundary, one model defined as an inverse limit of spaces of maps between configuration spaces and another which is cosimplicial. These models ... More
Age of High Redshift Objects - a Litmus Test for the Dark Energy ModelsSep 08 2005Dec 26 2005The discovery of the quasar, the APM 08279+5255 at z = 3.91 whose age is 2-3 Gyr has once again led to ``age crisis''. The noticeable fact about this object is that it cannot be accommodated in a universe with $\Omega_m = 0.27$, currently accepted value ... More
Lie coalgebras and rational homotopy theory, I: Graph coalgebrasOct 13 2006Jan 16 2009We develop a new, intrinsic, computationally friendly approach to Lie coalgebras through graph coalgebras, which are new and likely to be of independent interest. Our graph coalgebraic approach has advantages both in finding relations between coalgebra ... More
High Dimensional Discrete Integration by Hashing and OptimizationJun 29 2018Jan 28 2019Recently Ermon et al. (2013) pioneered a way to practically compute approximations to large scale counting or discrete integration problems by using random hashes. The hashes are used to reduce the counting problem into many separate discrete optimization ... More
Spin-photon entanglement interfaces in silicon carbide defect centersAug 11 2016Optically active spins in solid-state systems can be engineered to emit photons that are entangled with the spin in the solid. This allows for applications such as quantum communications, quantum key distribution, and distributed quantum computing. Recently, ... More
Experimental realization of mixed-synchronization in counter-rotating coupled oscillatorsMay 30 2011Recently, a novel mixed-synchronization phenomenon is observed in counter-rotating nonlinear coupled oscillators. In mixed-synchronization state: some variables are synchronized in-phase, while others are out-of-phase. We have experimentally verified ... More
Spin transport and Spin Tunnelling Magneto-Resistance (STMR) of F$|$NCSC$|$F spin valveJun 12 2019In this work, we study the spin transport at the Ferromagnet$|$Noncentrosymmetric Superconductor (F$|$NCSC) junction of a Ferromagnet$|$Noncentrosymmetric Superconductor$|$Ferromagnet (F$|$NCSC$|$F) spin valve. We investigate the Tunnelling Spin-Conductance ... More
Replicating Nanostructures on Silicon by Low Energy Ion BeamsOct 17 2004Jan 06 2005We report on a nanoscale patterning method on Si substrates using self-assembled metal islands and low-energy ion-beam irradiation. The Si nanostructures produced on the Si substrate have a one-to-one correspondence with the self-assembled metal (Ag, ... More
Band Structure of the Fractional Quantum Hall EffectAug 13 1992The eigenstates of interacting electrons in the fractional quantum Hall phase typically form fairly well defined bands in the energy space. We show that the composite fermion theory gives insight into the origin of these bands and provides an accurate ... More
Current induced magnetization dynamics and magnetization switching in superconducting ferromagnetic hybrid (F$|$S$|$F) structuresApr 29 2016Jul 23 2016We investigate the current induced magnetization dynamics and magnetization switching in an unconventional p-wave superconductor sandwiched between two misaligned ferromagnetic layers by numerically solving Landau-Lifshitz-Gilbert equation modified with ... More
Spin-photon entanglement interfaces in silicon carbide defect centersAug 11 2016Nov 20 2016Optically active spins in solid-state systems can be engineered to emit photons that are entangled with the spin in the solid. This allows for applications such as quantum communications, quantum key distribution, and distributed quantum computing. Recently, ... More
A new Measurement of Thermal Conductivity of Iron at high pressures and temperaturesSep 16 2016Thermal conductivity of the most abundant element in the planetary core, Iron (Fe) is measured up to Earth's outer core pressure $\sim 120$ GPa. The measurements are carried out using the laser heated diamond anvil cell facility, where the absorbed power ... More
Evidence for Superconductivity at Ambient Temperature and Pressure in NanostructuresJul 23 2018Despite being a low temperature phenomenon till date, superconductivity has found numerous applications in diverse fields of medicine, science and engineering. The great scientific interest in the phenomenon as well as its practical utility has motivated ... More
q-deformed logistic map with delay feedbackMar 14 2012The delay logistic map with two types of q-deformations: Tsallis and Quantum-group type are studied. The stability of the map and its bifurcation scheme is analyzed as a function of the deformation and delay feedback parameters. Chaos is suppressed in ... More
Crossover regimes in lower dimensional structuresAug 02 2013Modern growth and fabrication techniques can produce lower dimensional structures in the crossover regime. Such structures in the crossover regime can provide tunability of various properties. For example, a zero-dimensional (0-D) structure evolving towards ... More
A new Measurement of Thermal Conductivity of Iron at high pressures and temperaturesSep 16 2016Oct 13 2016Thermal conductivity of the most abundant element in the planetary core, Iron (Fe) is measured up to Earth's outer core pressure $\sim 120$ GPa. The measurements are carried out using the laser heated diamond anvil cell facility, where the absorbed power ... More
The Geometric Block ModelSep 16 2017Jan 24 2018To capture the inherent geometric features of many community detection problems, we propose to use a new random graph model of communities that we call a Geometric Block Model. The geometric block model generalizes the random geometric graphs in the same ... More
Non-vacuum AdS cosmology and comments on gauge theory correlatorAug 30 2016Several time dependent backgrounds, with perfect fluid matter, can be used to construct solutions of Einstein equations in the presence of a negative cosmological constant along with some matter sources. In this work we focus on the non-vacuum Kasner-AdS ... More
A note on AdS cosmology and gauge theory correlatorJan 26 2015May 21 2015Using AdS/CFT prescription, we compute two point Yang-Mills correlator on a constant time slice for the Kasner background. Pushing the surface close to the initial singularity, we find, in some cases, the correlator does not develop pole. This is consistent ... More
Trace Reconstruction: Generalized and ParameterizedApr 21 2019In the beautifully simple-to-state problem of trace reconstruction, the goal is to reconstruct an unknown binary string $x$ given random "traces" of $x$ where each trace is generated by deleting each coordinate of $x$ independently with probability $p<1$. ... More
Connectivity in Random Annulus Graphs and the Geometric Block ModelApr 12 2018Dec 13 2018We provide new connectivity results for {\em vertex-random graphs} or {\em random annulus graphs} which are significant generalizations of random geometric graphs. Random geometric graphs (RGG) are one of the most basic models of random graphs for spatial ... More
Minimal Radiative Neutrino Mass Mechanism for Inverse Seesaw ModelsSep 18 2012Dec 04 2012We study a minimal one-loop radiative mechanism for generating small Majorana neutrino masses in inverse seesaw extensions of the Standard Model with two singlet fermions per family. The new feature of this radiative mechanism is that the one-loop induced ... More
Multi-Lepton Collider Signatures of Heavy Dirac and Majorana NeutrinosDec 29 2011May 23 2012We discuss the possibility of observing multi-lepton signals at the Large Hadron Collider (LHC) from the production and decay of heavy Standard Model (SM) singlet neutrinos added in extensions of SM to explain the observed light neutrino masses by seesaw ... More
Some Discussion on Thermodynamical Behaviour of Modified Chaplygin GasJun 08 2010On going good number of research works establish Modified Chaplygin Gas as one one of the most favoured candidates of Dark Energy. In our present work, new bound on the parameter space of associated model - parameter has been worked out with new explanation. ... More
Electroweak Symmetry Breaking and Proton Decay in SO(10) SUSY-GUT with TeV W_RMar 31 2010In a recent paper, we proposed a new class of supersymmetric SO(10) models for neutrino masses where the TeV scale electroweak symmetry is SU(2)_L\times SU(2)_R\times U(1)_{B-L} making the associated gauge bosons W_R and Z' accessible at the Large Hadron ... More
Shear Dynamics in Higher Dimensional FLRW CosmologyApr 07 2014Apr 10 2014We study the shear dynamics of higher dimensional Friedmann-Lema\^{i}tre-Robertson-Walker (FLRW) cosmology by considering a non-perfect fluid which exerts different pressure in the normal and extra dimensions. We generalise the definition of shear tensor ... More
Heavy Neutrinos at Future CollidersJan 07 2016We discuss the current status and future prospects of heavy neutrino searches at the energy frontier, which might play an important role in vindicating the simplest seesaw paradigm as the new physics responsible for neutrino mass generation. After summarizing ... More
A Combined Astrophysical and Dark Matter Interpretation of the IceCube HESE and Throughgoing Muon EventsApr 13 2018Jul 05 2018We perform a combined likelihood analysis for the IceCube 6-year high-energy starting events (HESE) and 8-year throughgoing muon events above 10 TeV using a two-component neutrino flux model. The two-component flux can be motivated either from purely ... More
Predicting the Effects of News Sentiments on the Stock MarketDec 11 2018Stock market forecasting is very important in the planning of business activities. Stock price prediction has attracted many researchers in multiple disciplines including computer science, statistics, economics, finance, and operations research. Recent ... More
Zero Textures of the Neutrino Mass Matrix from Cyclic Family SymmetryJun 17 2011We present the symmetry realization of the phenomenologically viable Frampton-Glashow-Marfatia (FGM) two zero texture neutrino mass matrices in the flavor basis within the framework of the type (I+II) seesaw mechanism natural to SO(10) grand unification. ... More
CP-odd Weak Basis Invariants for Neutrino Mass Matrices with a Texture Zero and a Vanishing MinorOct 19 2010We construct the $CP$-odd weak basis invariants in the flavor basis for all the phenomenologically viable neutrino mass matrices with a texture zero and a vanishing minor and, also, find the necessary and sufficient conditions for $CP$ invariance . We ... More