Results for "Wes Armour"

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Science Pipelines for the Square Kilometre ArrayNov 20 2018The Square Kilometre Array (SKA) will be both the largest radio telescope ever constructed and the largest Big Data project in the known Universe. The first phase of the project will generate on the order of 5 zettabytes of data per year. A critical task ... More
Observations of transients and pulsars with LOFAR international stationsJul 02 2012The LOw FRequency ARray - LOFAR is a new radio telescope that is moving the science of radio pulsars and transients into a new phase. Its design places emphasis on digital hardware and flexible software instead of mechanical solutions. LOFAR observes ... More
ALFABURST: A realtime fast radio burst monitor for the Arecibo telescopeNov 13 2015Fast radio bursts (FRBs) constitute an emerging class of fast radio transient whose origin continues to be a mystery. Realizing the importance of increasing coverage of the search parameter space, we have designed, built, and deployed a realtime monitor ... More
Monte Carlo Study of Strongly-Interacting Degenerate Fermions: a Model for Voltage-Biased Bilayer GrapheneFeb 01 2013Feb 07 2013We formulate a model of N_f=4 flavors of relativistic fermion in 2+1d in the presence of a chemical potential mu coupled to two flavor doublets with opposite sign, akin to isopsin chemical potential in QCD. This is argued to be an effective theory for ... More
A polyphase filter for many-core architecturesNov 11 2015Apr 21 2016In this article we discuss our implementation of a polyphase filter for real-time data processing in radio astronomy. We describe in detail our implementation of the polyphase filter algorithm and its behaviour on three generations of NVIDIA GPU cards, ... More
Strong Interaction Effects at a Fermi Surface in a Model for Voltage-Biased Bilayer GrapheneSep 11 2015Monte Carlo simulation of a 2+1 dimensional model of voltage-biased bilayer graphene, consisting of relativistic fermions with chemical potential mu coupled to charged excitations with opposite sign on each layer, has exposed non-canonical scaling of ... More
Graphene as a Lattice Field TheoryJan 08 2015We introduce effective field theories for the electronic properties of graphene in terms of relativistic fermions propagating in 2+1 dimensions, and outline how strong inter-electron interactions may be modelled by numerical simulation of a lattice field ... More
The Implementation of a Real-Time Polyphase FilterNov 12 2014In this article we study the suitability of dierent computational accelerators for the task of real-time data processing. The algorithm used for comparison is the polyphase filter, a standard tool in signal processing and a well established algorithm. ... More
Monte Carlo Simulation of the Semimetal-Insulator Phase Transition in Monolayer GrapheneOct 29 2009A 2+1 dimensional fermion field theory is proposed as a model for the low-energy electronic excitations in monolayer graphene. The model consists of N=2 four-component Dirac fermions moving in the plane and interacting via a contact interaction between ... More
An Analysis of the Hadronic Spectrum from Lattice QCDSep 27 2006I begin by discussing the basic ideas of quantum field theory (QFT). I provide a review of symmetries in physics and then move on to discuss the quark model. I then review lattice gauge theory with particular attention paid to lattice QCD and some of ... More
An analysis of the vector meson spectrum from lattice QCDSep 12 2003We re-analyse meson sector data from the CP-PACS collaboration's dynamical simulations. Our analysis uses several different approaches, and compares the standard naive linear fit with the Adelaide Anzatz. We find that setting the scale using the J parameter ... More
Right-angled Artin groups with non-path-connected boundaryOct 26 2012We place conditions on the presentation graph of a right-angled Artin group that guarantee the standard CAT(0) cube complex on which the group acts geometrically has non-path-connected boundary.
Reproductive Value in Graph-structured PopulationsJul 17 2013Evolutionary graph theory has grown to be an area of intense study. Despite the amount of interest in the field, it seems to have grown separate from other subfields of population genetics and evolution. In the current work I introduce the concept of ... More
A Real-time Single Pulse Detection Algorithm for GPUsNov 29 2016The detection of non-repeating events in the radio spectrum has become an important area of study in radio astronomy over the last decade due to the discovery of fast radio bursts (FRBs). We have implemented a single pulse detection algorithm, for NVIDIA ... More
Quantum master equation descriptions of a nanomechanical resonator coupled to a single-electron transistorOct 10 2005We analyse the quantum dynamics of a nanomechanical resonator coupled to a normal-state single-electron transistor (SET). Starting from a microscopic description of the system, we derive a master equation for the SET island charge and resonator which ... More
Pulsar Acceleration Searches on the GPU for the Square Kilometre ArrayNov 23 2015Nov 24 2015Pulsar acceleration searches are methods for recovering signals from radio telescopes, that may otherwise be lost due to the effect of orbital acceleration in binary systems. The vast amount of data that will be produced by next generation instruments ... More
Geometric Classification of 4-Dimensional SuperalgebrasMar 21 2013We give a geometric classification of 4-dimensional superalgebras over an algebraic closed field.
GREENBURST: a commensal fast radio burst search back-end for the Green Bank TelescopeMar 13 2019We describe the design and deployment of GREENBURST, a commensal Fast Radio Burst (FRB) search system at the Green Bank Telescope. GREENBURST uses the dedicated L-band receiver tap to search over the 960$-$1920 MHz frequency range for pulses with dispersion ... More
Subfactors and Hadamard MatricesApr 09 2007To any complex Hadamard matrix H one associates a spin model commuting square, and therefore a hyperfinite subfactor. The standard invariant of this subfactor captures certain "group-like" symmetries of H. To gain some insight, we compute the first few ... More
Transport via a quantum shuttleApr 24 2002Nov 18 2002We investigate the effect of a quantised vibrational mode on electron tunneling through a chain of three quantum dots. The outer dots are coupled to voltage leads, but the position of the central dot is not rigidly fixed. Motion of the central dot modulates ... More
Validation of Information FusionJul 22 2016We motivate and offer a formal definition of validation as it applies to information fusion systems. Common definitions of validation compare the actual state of the world with that derived by the fusion process. This definition conflates properties of ... More
A classification of right-angled Coxeter groups with no 3-flats and locally connected boundaryJun 22 2012If $(W,S)$ is a right-angled Coxeter system and $W$ has no $\mathbb Z^3$ subgroups, then it is shown that the absence of an elementary separation property in the presentation diagram for $(W,S)$ implies all CAT(0) spaces acted on geometrically by $W$ ... More
Quantum Interference and Inelastic Scattering in a Model Which-Way DeviceSep 09 2002Sep 09 2002A which-way device is one which is designed to detect which of 2 paths is taken by a quantum particle, whether Schr\"odinger's cat is dead or alive. One possible such device is represented by an Aharonov-Bohm ring with a quantum dot on one branch. A charged ... More
Transport via a Quantum ShuttleSep 09 2002We investigate the effect of quantisation of vibrational modes on a system in which the transport path is through a quantum dot mounted on a cantilever or spring such that tunnelling to and from the dot is modulated by the oscillation. We consider here ... More
Commissioning of ALFABURST: initial tests and resultsFeb 13 2016Fast Radio Bursts (FRBs) are apparently one-time, relatively bright radio pulses that have been observed in recent years. The origin of FRBs is currently unknown and many instruments are being built to detect more of these bursts to better characterize ... More
Environmental Evolutionary Graph TheoryNov 13 2013Understanding the influence of an environment on the evolution of its resident population is a major challenge in evolutionary biology. Great progress has been made in homogeneous population structures while heterogeneous structures have received relatively ... More
On Exactly Solvable PotentialsSep 02 1995We investigate two methods of obtaining exactly solvable potentials with analytic forms.
Synchronization of micromasersOct 13 2016We investigate synchronization effects in quantum self-sustained oscillators theoretically using the micromaser as a model system. We use the probability distribution for the relative phase as a tool for quantifying the emergence of preferred phases when ... More
CO Line Emission from Compact Nuclear Starburst Disks Around Active Galactic NucleiApr 13 2012There is substantial evidence for a connection between star formation in the nuclear region of a galaxy and growth of the central supermassive black hole. Furthermore, starburst activity in the region around an active galactic nucleus (AGN) may provide ... More
Probing the quantum coherence of a nanomechanical resonator using a superconducting qubit II: ImplementationApr 14 2008We describe a possible implementation of the nanomechanical quantum superposition generation and detection scheme described in the preceding, companion paper [Armour A D and Blencowe M P 2008 New. J. Phys. Submitted]. The implementation is based on the ... More
Josephson photonics with a two-mode superconducting circuitMar 02 2015We analyze the quantum dynamics of two electromagnetic oscillators coupled in series to a voltage biased Josephson junction. When the applied voltage leads to a Josephson frequency across the junction which matches the sum of the two mode frequencies, ... More
Dephasing and thermal smearing in an electromechanical which-path deviceOct 07 2001In an electromechanical which-path device electrons travelling through an Aharonov-Bohm ring with a quantum dot in one of the arms are dephased by an interaction with the fundamental flexural mode of a radio-frequency cantilever, leading to a reduction ... More
Non-linear dynamics of a driven nanomechanical single electron transistorJan 30 2013Apr 10 2013We analyze the response of a nanomechanical resonator to an external drive when it is also coupled to a single-electron transistor (SET). The interaction between the SET electrons and the mechanical resonator depends on the amplitude of the mechanical ... More
Propagating and evanescent waves in absorbing mediaJun 07 2002Jan 10 2003We compare the behavior of propagating and evanescent light waves in absorbing media with that of electrons in the presence of inelastic scattering. The imaginary part of the dielectric constant results primarily in an exponential decay of a propagating ... More
An Electromechanical Which-Path InterferometerJan 11 2001Aug 28 2001We investigate the possibility of an electromechanical which-path interferometer, in which electrons travelling through an Aharonov-Bohm ring incorporating a quantum dot in one of the arms are dephased by an interaction with the fundamental flexural mode ... More
Amplitude Noise Squeezing in Cavity-Driven Oscillations of a Mechanical ResonatorSep 24 2009Feb 02 2010We analyze the amplitude and phase noise of limit-cycle oscillations in a mechanical resonator coupled parametrically to an optical cavity driven above its resonant frequency. At a given temperature the limit-cycle oscillations have lower amplitude noise ... More
SETIBURST: A Robotic, Commensal, Realtime Multi-Science Backend for the Arecibo TelescopeJan 17 2017Radio astronomy has traditionally depended on observatories allocating time to observers for exclusive use of their telescopes. The disadvantage of this scheme is that the data thus collected is rarely used for other astronomy applications, and in many ... More
GUICop: Approach and Toolset for Specification-based GUI TestingJul 06 2016Aug 21 2016Oracles used for testing graphical user interface (GUI) programs are required to take into consideration complicating factors such as variations in screen resolution or color scheme when comparing observed GUI elements to expected GUI elements. Researchers ... More
Evolutionary Game Dynamics in Populations with Heterogeneous StructuresDec 10 2013Evolutionary graph theory is a well established framework for modelling the evolution of social behaviours in structured populations. An emerging consensus in this field is that graphs that exhibit heterogeneity in the number of connections between individuals ... More
KeV scale new fermion from a hidden sectorMar 29 2019Apr 06 2019We studied a simple model of hidden sector consists of a Dirac fermion $\chi$ and a spontaneously broken $U(1)_s$ symmetry. The dark sector is connected to the Standard Model(SM) via three righthanded SM singlet neutrinos, $N_R$'s, and the kinetic mixing ... More
Lattice Simulations near the Semimetal-Insulator Phase Transition of GrapheneAug 02 2009We present results from Monte Carlo simulations of a three dimensional fermionic field theory which can be derived from a model of graphene in which electrons interact via a screened Coulomb potential. For our simulations we employ lattice gauge theory ... More
Monte Carlo simulation of monolayer graphene at non-zero temperatureMay 05 2011Aug 09 2011We present results from lattice simulations of a monolayer graphene model at non-zero temperature. At low temperatures for sufficiently strong coupling the model develops an excitonic condensate of particle-hole pairs corresponding to an insulating phase. ... More
Probing the quantum coherence of a nanomechanical resonator using a superconducting qubit: I. Echo schemeApr 14 2008We propose a scheme in which the quantum coherence of a nanomechanical resonator can be probed using a superconducting qubit. We consider a mechanical resonator coupled capacitively to a Cooper-pair box and assume that the superconducting qubit is tuned ... More
Quantum-classical correspondence for a dc-biased cavity resonator--Cooper-pair transistor systemJun 29 2011We investigate the quantum versus classical dynamics of a microwave cavity-coupled-Cooper pair transistor (CPT) system, where an applied dc bias causes the system to self-oscillate via the ac Josephson effect. Varying the dc bias allows the self-oscillation ... More
Electronic and photonic counting statistics as probes of non-equilibrium quantum dynamicsJun 07 2016When a mesoscopic conductor is coupled to a high-quality electromagnetic cavity the flow of charges and the flux of photons leaking out of the cavity can both depend strongly on the coupled quantum dynamics of the system. Using a voltage-biased Josephson ... More
Noise properties of two single electron transistors coupled by a nanomechanical resonatorJun 16 2005Jun 24 2005We analyze the noise properties of two single electron transistors (SETs) coupled via a shared voltage gate consisting of a nanomechanical resonator. Working in the regime where the resonator can be treated as a classical system, we find that the SETs ... More
A Minimal Model of Majoronic Dark Radiation and Dark MatterJun 18 2014Sep 25 2014We extend the singlet Majoron model of dark radiation by adding another singlet scalar of unit lepton charge. The spontaneous breaking of global $U(1)_L$ connects dark radiation with neutrino mass generation via the type-I seesaw mechanism. The model ... More
Study of Gauged Lepton Symmetry Signatures at CollidersMay 25 2018Aug 10 2018We construct a new gauged $U(1)_\ell$ lepton number model which is anomaly-free for each SM generation. The active neutrino masses are radiatively generated with a minimal scalar sector. The phenomenology and collider signals are studied. The interference ... More
An Effective Operators Analysis of Leptonic CP Violation : Bridging High and Low Energy ProcessesAug 05 2005Nov 15 2005We study the leptonic CP violation by employing the complete set of dimension-six pure leptonic effective operators. Connection among the observable at different energy scales can be made by the running of the renormalization group equations. Explicitly, ... More
Neutrino Masses in 5D Orbifold SU(5) Unification Models without Right-handed SingletsAug 19 2003We explore a mechanism for radiatively generating neutrino Majorana masses in a 5 dimensional orbifold SU(5) unification model without introducing right-handed singlets. The model is non-supersymmetric and the extra dimension is compactified via a $s_1/(Z_2\times ... More
Alternative Interpretation of the Tevatron Top EventsOct 29 1998Nov 01 1998We propose an alternative interpretation of the top events discovered at the Tevatron in 1995. Given that the charge of the $b$ quark jet cannot be measured for the whole sample with certainty, the signal can be due to a quark of charge -4/3 at the reported ... More
An Effective Operators Analysis of CP Violation : The Semileptonic CaseDec 27 2005Aiming at a model-independent analysis of possible new physics effects in semileptonic processes at various energy scales, we list and study a complete set of $SU(3)_c\times SU(2)_L\times U(1)_Y$ invariant 4-Fermi operators which consist of a pair of ... More
Charged Lepton Electric Dipole Moments from TeV Scale Right-handed NeutrinosNov 16 2004Feb 14 2005We study the connection between charged lepton electric dipole moments, $d_l$ $(l=e,\mu,\tau)$, and seesaw neutrino mass generation in a simple two Higgs doublet extension of the Standard Model plus three right-handed neutrinos (RHN) $N_a$, $a=1,2,3$. ... More
Fitting Precision Electroweak Data with Exotic Heavy QuarksSep 28 1999Oct 02 1999The 1999 precision electroweak data from LEP and SLC persist in showing some slight discrepancies from the assumed standard model, mostly regarding $b$ and $c$ quarks. We show how their mixing with exotic heavy quarks could result in a more consistent ... More
GUICop: Approach and Toolset for Specification-based GUI TestingJul 06 2016Nov 17 2016Oracles used for testing graphical user interface (GUI) programs are required to take into consideration complicating factors such as variations in screen resolution or color scheme when comparing observed GUI elements to expected GUI elements. Researchers ... More
Renormalization Group Study of the Minimal Majoronic Dark Radiation and Dark Matter ModelApr 07 2016Jul 19 2016We study the 1-loop renormalization group equation running in the simplest singlet Majoron model constructed by us earlier to accommodate the dark radiation and dark matter content in the universe. A comprehensive numerical study was performed to explore ... More
Lepton Flavor Violation in Extra Dimension ModelsJan 18 2005Models involving large extra spatial dimension(s) have interesting predictions on lepton flavor violating processes. We consider some 5D models which are related to neutrino mass generation or address the fermion masses hierarchy problem. We study the ... More
Neutrino masses and gauged $U(1)_\ell$ lepton numberJul 25 2018Oct 04 2018We investigate the tree-level neutrino mass generation in the gauged $U(1)_\ell$ lepton model recently proposed by us [arXiv:1805.10382]. With the addition of one Standard Model(SM) singlet, $\phi_1(Y=0, \ell=1)$, and one SM triplet scalar, $T(Y=-1,\ell=0)$, ... More
Alternative Perspective on Gauged Lepton Number and Implications for Collider PhysicsAug 24 2018A new anomaly-free gauged $U(1)_\ell$ lepton-number model is studied. Two standard model lepton generations acquire the same but oppositive sign $U(1)_\ell$ charges, while four exotic chiral leptons cancel the anomalies of the remaining lepton family. ... More
A model for Neutrino Masses and Dark Matter with the Discrete Gauge SymmetryApr 20 2011Jan 21 2012A simple renormalizable U(1) gauge model is constructed to explain the smallness of the active neutrino masses and provide the stable cold dark matter candidate simultaneously. The local U(1) symmetry is assumed to be spontaneously broken by a scalar ... More
KeV scale new fermion from a hidden sectorMar 29 2019We studied a simple model of hidden sector consists of a Dirac fermion $\chi$ and a spontaneously broken $U(1)_s$ symmetry. The dark sector is connected to the Standard Model(SM) via three righthanded SM singlet neutrinos, $N_R$'s, and the kinetic mixing ... More
CP violation in 5D Split Fermions ScenarioOct 29 2002We give a new configuration of split fermion positions in one extra dimension with two different Yukawa coupling strengths for up-type, $h_u$, and down-type, $h_d$, quarks at $\frac{h_u}{h_d}=36.0$. The new configurations can give enough CP violating ... More
Phenomenology of a 5D Orbifold $SU(3)_W$ Unification modelDec 16 2003We study the phenomenology of a 5D $SU(3)_W$ model on a $S_1/(Z_2\times Z'_2)$ orbifold in which the minimal scalar sector plays an essential role of radiatively generating neutrino Majorana masses without the benefits of right-handed singlets. We carefully ... More
The Star Formation Laws of Eddington-Limited Star-Forming DisksJan 29 2013Two important avenues into understanding the formation and evolution of galaxies are the Kennicutt-Schmidt (KS) and Elmegreen-Silk (ES) laws. These relations connect the surface densities of gas and star formation (\sigmagas\ and \sigmastar, respectively) ... More
The importance of an accurate target wave function in variational calculations for (e^{+}-H_{2}) scatteringOct 01 2008Nov 03 2008Using the complex Kohn method, we have calculated variational values of phase shifts and the annihilation parameter, Z_{eff}, for the elastic scattering of positrons by molecular hydrogen. Our results are sensitive to small changes in the accuracy of ... More
Anomaly-free singularities in the generalized Kohn variational methodOct 27 2008Jan 09 2009We have carried out an analysis of singularities in Kohn variational calculations for low energy e^{+}-H_{2} elastic scattering. Provided that a sufficiently accurate trial wavefunction is used, we argue that our implementation of the Kohn variational ... More
Equivalence of the generalized and complex Kohn variational methodsJan 08 2010Mar 11 2010For Kohn variational calculations on low energy positron hydrogen molecule elastic scattering, we prove that the phase shift approximation obtained using the complex Kohn method is precisely equal to a value which can be obtained immediately via the real-generalized ... More
Entanglement and decoherence of a micromechanical resonator via coupling to a Cooper boxDec 20 2001We analyse the quantum dynamics of a micromechanical resonator capacitively coupled to a Cooper box. With appropriate quantum state control of the Cooper box, the resonator can be driven into a superposition of spatially separated states. The Cooper box ... More
Quantum current noise from a Born-Markov master equationJan 30 2012Aug 28 2012We present a formalism for calculating the non-symmetrized quantum current noise within the Born-Markov approximation for the master equation. The formalism is particularly well suited to obtaining the current noise for quantum transport in mesoscopic ... More
Classical dynamics of a nano-mechanical resonator coupled to a single-electron transistorJul 22 2003We analyze the dynamics of a nano-mechanical resonator coupled to a single-electron transistor (SET) in the regime where the resonator behaves classically. A master equation is derived describing the dynamics of the coupled system which is then used to ... More
Phase Transitions in Trajectories of a Superconducting Single-Electron Transistor Coupled to a ResonatorJan 11 2012May 30 2012Recent progress in the study of dynamical phase transitions has been made with a large-deviation approach to study trajectories of stochastic jumps using a thermodynamic formalism. We study this method applied to an open quantum system consisting of a ... More
Josephson junction cavity systems as cousins of the quantum optical micromaserMar 11 2019We explore the similarities and differences between simple theoretical models developed to describe the quantum optical micromaser and Josephson-photonics devices. Whilst the micromaser has long been recognised as an important model for the dynamics of ... More
Mechanical Lamb-shift analogue for the Cooper-pair boxSep 12 2001We estimate the correction to the Cooper-pair box energy level splitting due to the quantum motion of a coupled micromechanical gate electrode. While the correction due to zero-point motion is very small, it should be possible to observe thermal motion-induced ... More
Current noise of a superconducting single electron transistor coupled to a resonatorJun 09 2008Jul 21 2008We analyze the current and zero-frequency current noise properties of a superconducting single electron resonator (SSET) coupled to a resonator, focusing on the regime where the SSET is operated in the vicinity of the Josephson quasiparticle resonance. ... More
Quantum dynamics of a resonator driven by a superconducting single-electron transistor: a solid-state analogue of the micromaserAug 07 2006Feb 09 2007We investigate the behavior of a quantum resonator coupled to a superconducting single-electron transistor tuned to the Josephson quasiparticle resonance and show that the dynamics is similar in many ways to that found in a micromaser. Coupling to the ... More
Improved Acceleration of the GPU Fourier Domain Acceleration Search AlgorithmNov 29 2017We present an improvement of our implementation of the Correlation Technique for the Fourier Domain Acceleration Search (FDAS) algorithm on Graphics Processor Units (GPUs) (Dimoudi & Armour 2015; Dimoudi et al. 2017). Our new improved convolution code ... More
ALFABURST: A commensal search for Fast Radio Bursts with AreciboOct 30 2017Nov 22 2017ALFABURST has been searching for Fast Radio Bursts (FRBs) commensally with other projects using the Arecibo L-band Feed Array (ALFA) receiver at the Arecibo Observatory since July 2015. We describe the observing system and report on the non-detection ... More
Refugee Resettlement Housing ScoutSep 28 2016According to the United States High Commission for Refugees (UNHCr), there are 65.3 million forcibly displaced people in the world today, 21.5 million of them being refugees. This has led to an unprecedented refugee crisis which has led countries to accept ... More
Atomic Scale Design and Three-Dimensional Simulation of Ionic Diffusive Nanofluidic ChannelsMar 02 2015Recent advance in nanotechnology has led to rapid advances in nanofluidics, which has been established as a reliable means for a wide variety of applications, including molecular separation, detection, crystallization and biosynthesis. Although atomic ... More
Lepton Universality, Rare Decays and Split FermionsMar 22 2002Jun 20 2002We investigate the constraint on the split fermions in extra dimensions by considering the universality of $W$ leptonic decays $W\to l_i \nu_i$, the charged lepton decays $l_i \ra l_j\nu_i\bar{\nu}_j$, and the lepton flavor violating process $l_i\ra \bar{l}_j ... More
New constraint from Electric Dipole Moments on chargino baryogenesis in MSSMMay 08 2002Sep 12 2002A commonly accepted mechanism of generating baryon asymmetry in the minimal supersymmetric standard model (MSSM) depends on the CP violating relative phase between the gaugino mass and the Higgsino mu term. The direct constraint on this phase comes from ... More
An effective gauge-Higgs operators analysis of new physics associated with the HiggsMar 28 2013Aug 14 2013We study the new physics(NP) related to the recent discovered 125 GeV Higgs by employing an important subset of the standard model(SM) gauge invariant dimension-six operators constructed by the the SM Higgs and gauge fields. Explicitly, we perform a model-independent ... More
ResumeNet: A Learning-based Framework for Automatic Resume Quality AssessmentOct 05 2018Recruitment of appropriate people for certain positions is critical for any companies or organizations. Manually screening to select appropriate candidates from large amounts of resumes can be exhausted and time-consuming. However, there is no public ... More
Persistent Homology for The Quantitative Prediction of Fullerene StabilityDec 07 2014Persistent homology is a relatively new tool often used for \emph{qualitative} analysis of intrinsic topological features in images and data originated from scientific and engineering applications. In this paper, we report novel \emph{quantitative} predictions ... More
Quantum trajectory phase transitions in the micromaserMar 04 2011Mar 07 2011We study the dynamics of the single atom maser, or micromaser, by means of the recently introduced method of thermodynamics of quantum jump trajectories. We find that the dynamics of the micromaser displays multiple space-time phase transitions, i.e., ... More
Dynamics of a nanomechanical resonator coupled to a superconducting single-electron transistorJul 27 2005We present an analysis of the dynamics of a nanomechanical resonator coupled to a superconducting single electron transistor (SSET) in the vicinity of the Josephson quasiparticle (JQP) and double Josephson quasiparticle (DJQP) resonances. For weak coupling ... More
Charge noise at Cooper-pair resonancesMay 18 2010Aug 25 2010We analyze the charge dynamics of a superconducting single-electron transistor (SSET) in the regime where charge transport occurs via Cooper-pair resonances. Using an approximate description of the system Hamiltonian, in terms of a series of resonant ... More
Dynamical multistability in a quantum-dot laserAug 14 2018Jan 30 2019We study the dynamical multistability of a solid-state single-atom laser implemented in a quantum-dot spin valve. The system is formed by a resonator that interacts with a two-level system in a dot in contact with two ferromagnetic leads of antiparallel ... More
Spectral properties of a resonator driven by a superconducting single-electron transistorDec 22 2009We analyze the spectral properties of a resonator coupled to a superconducting single electron transistor (SSET) close to the Josephson quasiparticle resonance. Focussing on the regime where the resonator is driven into a limit-cycle state by the SSET, ... More
Initial Results from the ALFABURST SurveyOct 25 2017Here, we present initial results from the ALFABURST radio transient survey, which is currently running in a commensal mode with the ALFA receiver at the Arecibo telescope. We observed for a total of 1400 hours and have detected single pulses from known ... More
UCov: a User-Defined Coverage Criterion for Test Case Intent VerificationJul 11 2014The goal of regression testing is to ensure that the behavior of existing code is not altered by new program changes. The primary focus of regression testing should be on code associated with: a) earlier bug fixes; and b) particular application scenarios ... More
Serverless computing provides on-demand high performance computing for biomedical researchJul 31 2018Cloud computing offers on-demand, scalable computing and storage, and has become an essential resource for the analyses of big biomedical data. The usual approach to cloud computing requires users to reserve and provision virtual servers. An emerging ... More
Prospects for Detecting light bosons at the FCC-ee and CEPCMar 01 2018Jun 11 2018We look at the prospects for detecting light bosons, $X$, at proposed Z factories assuming a production of $10^{12}$ Z bosons. Such a large yield is within the design goals of future FCC-ee and CEPC colliders. Specifically we look at the cases where $X$ ... More
Constraints on New Scalars from the LHC 125 GeV Higgs SignalJun 22 2012Aug 07 2012We study the implications the recent results from the LHC Higgs searches have on scalar new physics. We study the impact on both the Higgs production and decay from scalars with and without colour, and in cases where decoupling do and do not happen. We ... More
Phenomenology from a U(1) gauged hidden sectorJun 15 2007We consider the phenomenological consequences of a hidden Higgs sector extending the Standard Model (SM), in which the matter content are uncharged under the SM gauge groups. We consider a simple case where the hidden sector is gauged under a U(1) with ... More
Testing Realistic Quark Mass Matrices in the Custodial Randall-Sundrum Model with Flavor Changing Top DecaysJun 04 2008Nov 05 2008We study quark mass matrices in the Randall-Sundrum (RS) model with bulk symmetry $SU(2)_L \times SU(2)_R \times U(1)_{B-L}$. The Yukawa couplings are assumed to be within an order of magnitude of each other, and perturbative. We find that quark mass ... More
A One-Hop Information Based Geographic Routing Protocol for Delay Tolerant MANETsFeb 26 2016Jun 21 2017Delay and Disruption Tolerant Networks (DTNs) may lack continuous network connectivity. Routing in DTNs is thus a challenge since it must handle network partitioning, long delays, and dynamic topology. Meanwhile, routing protocols of the traditional Mobile ... More
Neutrino Masses in a 5D $SU(3)_W$ TeV Unification ModelJan 30 2003We study the generation of neutrino masses in the $SU(3)_W$ electroweak unified theory in $M_4\times S_1/(Z_2\times Z'_2)$ spacetime. By appropriate orbifolding, the bulk symmetry $SU(3)_W$ is broken into $SU(2)_L \times U(1)_Y$ at one of the fixed points, ... More
Coincidental Correctness in the Defects4J BenchmarkAug 28 2018Jan 30 2019Coincidental correctness (CC) arises when a defective program produces the correct output despite the fact that the defect within was exercised. Researchers have recognized the negative impact of coincidental correctness, and the authors have previously ... More
Signal for a light singlet scalar at the LHCNov 15 2017Mar 16 2018In the general Higgs portal like models, the extra neutral scalar, $S$, can mix with the Standard Model (SM) Higgs boson, $H$. We perform an exploratory study focusing on the direct search for such a light singlet $S$ at the Large Hadron Collider (LHC). ... More