Results for "Peter H. Tsang"

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Schwinger Generating Functional Derivation of LHC Elastic Proton-Proton Scattering AmplitudesNov 12 2018Nov 30 2018A recent Schwinger Generating Functional based formulation, by H.M.Fried,Y.Gabellini,T.Grandou and Y-M.Sheu and P.H.Tsang provided gauge-invariant, exact, non-perturbative solutions for QCD. After choosing a renormalization scheme and assuming a simpler ... More
Effective locality and chiral symmetry breaking in $QCD$May 14 2019A few years ago the use of standard functional manipulations was demonstrated to imply an unexpected property satisfied by the fermionic Green's functions of QCD, and called \textit{effective locality}. This feature of QCD is non-perturbative as it results ... More
Chiral Symmetry Breaking out of QCD Effective LocalityOct 11 2018The QCD non-perturbative property of Effective Locality whose essential meaning has been disclosed recently, is here questioned about the chiral symmetry breaking phenomenon, one of the two major issues of the non-perturbative phase of QCD. As a first ... More
Comparison of Non-Perturbative, Gauge-Invariant, Realistic QCD with ISR Elastic pp Scattering DataNov 08 2016Using previously-described, functional techniques for exact solutions to QCD processes, a simplified version of the amplitudes provides high-quality fits to the ISR data. Qualitative generalizations to initial LHC data are suggested, and are presently ... More
Comparison of Gluon Bundle based QCD Curves with ISR Elastic pp Scattering DataNov 08 2016Nov 30 2016Using previously described, functional techniques for solutions to QCD processes, a simplified version of the amplitudes provides fits to the ISR data.
Comparison of Gluon Bundle based QCD Curves with ISR Elastic pp Scattering DataNov 08 2016May 16 2017Using previously described functional techniques for exact, non-perturbative, gauge-invariant renormalized QCD processes, a simplified version of the amplitudes - in which forms akin to Pomerons naturally appear - provides fits to ISR Elastic pp scattering ... More
A physical version of the QCD confinement scale(s)Feb 15 2015We suggest a physical definition of the confinement mass scale in QCD in the framework of non-perturbative, gauge invariant QCD, where all possible gluons exchanged between any pair of quark lines are included; and we insist that a stable, quark bound ... More
Quantum theory of optical temporal phase and instantaneous frequency. II. Continuous time limit and state-variable approach to phase-locked loop designFeb 18 2009May 21 2009We consider the continuous-time version of our recently proposed quantum theory of optical temporal phase and instantaneous frequency [Tsang, Shapiro, and Lloyd, Phys. Rev. A 78, 053820 (2008)]. Using a state-variable approach to estimation, we design ... More
Quantum theory of optical temporal phase and instantaneous frequencyApr 03 2008Nov 18 2008We propose a general quantum theory of optical phase and instantaneous frequency in the time domain for slowly varying optical signals. Guided by classical estimation theory, we design homodyne phase-locked loops that enable quantum-limited measurements ... More
Deep Neural Network Classifier for Variable Stars with Novelty Detection CapabilityMay 14 2019Common variable star classifiers are built only with the goal of producing the correct class labels, leaving much of the multi-task capability of deep neural networks unexplored. We present a periodic light curve classifier that combines a recurrent neural ... More
BSM Kaon Mixing at the Physical PointFeb 27 2017We present new preliminary results for bag parameters and ratios of the BSM kaon mixing operators measured at the physical point. The results are obtained from simulations of domain wall fermion QCD with 2+1 flavours with an Iwasaki gauge, and now include ... More
Optimized Random Deployment of Energy Harvesting Sensors for Field Reconstruction in Analog and Digital Forwarding SystemsMay 19 2015This work examines the large-scale deployment of energy harvesting sensors for the purpose of sensing and reconstruction of a spatially correlated Gaussian random field. The sensors are powered solely by energy harvested from the environment and are deployed ... More
Discrete diffusion Lyman-alpha radiative transferSep 28 2017Jun 09 2018Due to its accuracy and generality, Monte Carlo radiative transfer (MCRT) has emerged as the prevalent method for Ly$\alpha$ radiative transfer in arbitrary geometries. The standard MCRT encounters a significant efficiency barrier in the high optical ... More
Asymptotic Performance Evaluation of Battery Swapping and Charging Station for Electric VehiclesJul 22 2017Jul 26 2017A battery swapping and charging station (BSCS) is an energy refueling station, where i) electric vehicles (EVs) with depleted batteries (DBs) can swap their DBs for fully-charged ones, and ii) the swapped DBs are then charged until they are fully-charged. ... More
Exact solutions for periodic and solitary matter waves in nonlinear latticesDec 11 2010We produce three vast classes of exact periodic and soliton solutions to the one-dimensional Gross-Pitaevskii equation (GPE) with the pseudopotential in the form of a nonlinear lattice (NL), induced by a spatially periodic modulation of the local nonlinearity. ... More
Empirical tests of the black hole no-hair conjecture using gravitational-wave observationsMay 12 2018Nov 22 2018We show that second-generation gravitational-wave detectors at their design sensitivity will allow us to directly probe the ringdown phase of binary black hole coalescences. This opens the possibility to test the so-called black hole no-hair conjecture ... More
An exploratory study of heavy domain wall fermions on the latticeFeb 12 2016We report on an exploratory study of domain wall fermions (DWF) as a lattice regularisation for heavy quarks. Within the framework of quenched QCD with the tree-level improved Symanzik gauge action we identify the DWF parameters which minimise discretisation ... More
Domain Wall Charm Physics with Physical Pion Masses: Decay constants, bag and $ξ$ parametersNov 30 2015We provide an overview of RBC/UKQCD's charm project on 2+1 flavour physical pion mass ensembles using M\"obius Domain Wall Fermions for the light as well as for the charm quark. We discuss the analysis strategy in detail and present results at the different ... More
Beyond the Standard Model Kaon Mixing with Physical MassesDec 12 2018Dec 15 2018We present results from a calculation of beyond the standard model (BSM) kaon mixing including data physical with light quark masses. We simulate $N_f=2+1$ QCD with Iwasaki gauge and domain wall fermion action on 8 ensembles, spanning 3 lattice spacings ... More
Charm Physics with Domain Wall Fermions and Physical Pion MassesNov 21 2016We present RBC/UKQCD's charm project using $N_f=2+1$ flavour ensembles with inverse lattice spacings in the range $1.73-2.77\,\mathrm{GeV}$ and two physical pion mass ensembles. Domain wall fermions are used for the light as well as the charm quarks. ... More
The decay constants ${\mathbf{f_D}}$ and ${\mathbf{f_{D_{s}}}}$ in the continuum limit of ${\mathbf{N_f=2+1}}$ domain wall lattice QCDJan 10 2017We present results for the decay constants of the $D$ and $D_s$ mesons computed in lattice QCD with $N_f=2+1$ dynamical flavours. The simulations are based on RBC/UKQCD's domain wall ensembles with both physical and unphysical light-quark masses and lattice ... More
BSM Kaon Mixing at the Physical PointOct 25 2017Oct 31 2017We present a progress update on the calculation of beyond the standard model (BSM) kaon mixing matrix elements at the physical point. Simulations are performed using 2+1 flavour domain wall lattice QCD with the Iwasaki gauge action at 3 lattice spacings ... More
A new approach to analytic, non-perturbative, gauge-invariant QCD renormalization is described, with applications to high energy elastic pp-scatteringNov 25 2015A new non-perturbative, gauge-invariant model QCD renormalization is applied to high energy elastic pp-scattering. The differential cross-section deduced from this model displays a diffraction dip that resembles those of experiments. Comparison with ISR ... More
Conservative error measures for classical and quantum metrologyMay 12 2016The classical and quantum Cram\'er-Rao bounds have become standard measures of parameter-estimation uncertainty for a variety of sensing and imaging applications in recent years, but their assumption of unbiased estimators potentially undermines their ... More
Mismatched Quantum Filtering and Entropic InformationOct 01 2013Jan 27 2014Quantum filtering is a signal processing technique that estimates the posterior state of a quantum system under continuous measurements and has become a standard tool in quantum information processing, with applications in quantum state preparation, quantum ... More
Beating the spatial standard quantum limits via adiabatic soliton expansionApr 18 2006May 09 2006Spatial quantum enhancement effects are studied under a unified framework. It is shown that the multiphoton absorption rate of photons with a quantum-enhanced lithographic resolution is reduced, not enhanced, contrary to popular belief. The use of adiabatic ... More
Quantum limits to optical point-source localizationNov 11 2014Jul 27 2015Motivated by the importance of optical microscopes to science and engineering, scientists have pondered for centuries how to improve their resolution and the existence of fundamental resolution limits. In recent years, a new class of microscopes that ... More
Hopf-Galois structures on a Galois $S_n$-extensionDec 16 2018In this paper, we shall determine the exact number of Hopf-Galois structures on a Galois $S_n$-extension, where $S_n$ denotes the symmetric group on $n$ letters.
Non-existence of Hopf-Galois structures and bijective crossed homomorphismsMay 28 2018Sep 15 2018By work of C. Greither and B. Pareigis as well as N. P. Byott, the enumeration of Hopf-Galois structures on a Galois extension of fields with Galois group $G$ may be reduced to that of regular subgroups of $\mbox{Hol}(N)$ isomorphic to $G$ as $N$ ranges ... More
On the self-duality of rings of integers in tame and abelian extensionsMar 09 2017Dec 06 2018Let $L/K$ be a tame and Galois extension of number fields with group $G$. It is well-known that any ambiguous ideal in $L$ is locally free over $\mathcal{O}_KG$ (of rank one), and so it defines a class in the locally free class group of $\mathcal{O}_KG$, ... More
On the multiple holomorph of a finite almost simple groupApr 22 2019Let $G$ be a group and write $\mbox{Perm}(G)$ for its symmetric group. The holomorph $\mbox{Hol}(G)$ of $G$ is defined to be the normalizer of the subgroup of left translations in $\mbox{Perm}(G)$. Its normalizer $\mbox{NHol}(G)$ in $\mbox{Perm}(G)$ in ... More
An Exact, Finite, Gauge-Invariant, Non-Perturbative Model of QCD RenormalizationDec 05 2014Mar 03 2015A particular choice of renormalization, within the simplifications provided by the non-perturbative property of Effective Locality, leads to a completely finite, renormalized theory of QCD, in which all correlation functions can, in principle, be defined ... More
Comparison of QCD Curves with Elastic pp Scattering DatsApr 24 2019Using previously described functional techniques for some non--perturbative, gauge invariant, renormalized QCD processes, a simplified version of the amplitudes --- in which forms akin to Pomerons naturally appear --- provides fits to ISR and LHC--TOTEM ... More
Comparison of QCD Curves with Elastic pp Scattering DataApr 24 2019Apr 30 2019Using previously described functional techniques for some non--perturbative, gauge invariant, renormalized QCD processes, a simplified version of the amplitudes --- in which forms akin to Pomerons naturally appear --- provides fits to ISR and LHC--TOTEM ... More
Comparison of QCD Curves with Elastic pp Scattering DataApr 24 2019Apr 29 2019Using previously described functional techniques for some non--perturbative, gauge invariant, renormalized QCD processes, a simplified version of the amplitudes --- in which forms akin to Pomerons naturally appear --- provides fits to ISR and LHC--TOTEM ... More
Cavity quantum electro-opticsFeb 27 2010Jun 30 2010The quantum dynamics of the coupling between a cavity optical field and a resonator microwave field via the electro-optic effect is studied. This coupling has the same form as the opto-mechanical coupling via radiation pressure, so all previously considered ... More
Fundamental Quantum Limit to Multiphoton Absorption Rate for Monochromatic LightFeb 04 2008Jul 22 2008The local multiphoton absorption rate for an arbitrary quantum state of monochromatic light, taking into account the photon number, momentum, and polarization degrees of freedom, is shown to have an upper bound that can be reached by coherent fields. ... More
Quantum temporal correlations and entanglement via adiabatic control of vector solitonsMar 10 2006May 29 2007It is shown that optical pulses with a mean position accuracy beyond the standard quantum limit can be produced by adiabatically expanding an optical vector soliton followed by classical dispersion management. The proposed scheme is also capable of entangling ... More
Cavity quantum electro-optics. II. Input-output relations between traveling optical and microwave fieldsMay 11 2011Aug 12 2011In the previous paper [M. Tsang, Phys. Rev. A 81, 063837 (2010), e-print arXiv:1003.0116], I proposed a quantum model of a cavity electro-optic modulator, which can coherently couple an optical cavity mode to a microwave resonator mode and enable novel ... More
A Bayesian quasi-probability approach to inferring the past of quantum observablesMar 13 2014Apr 01 2014I describe a method of inferring the past of quantum observables given the initial state and the subsequent measurement results using Wigner quasi-probability representations. The method is proved to be compatible with logic for large subclasses of quantum ... More
Shattering Flares During Close Encounters of Neutron StarsJul 12 2013We demonstrate that resonant shattering flares can occur during close passages of neutron stars in eccentric or hyperbolic encounters. We provide updated estimates for the rate of close encounters of compact objects in dense stellar environments, which ... More
Testing quantum mechanics: a statistical approachJun 12 2013Jan 27 2014As experiments continue to push the quantum-classical boundary using increasingly complex dynamical systems, the interpretation of experimental data becomes more and more challenging: when the observations are noisy, indirect, and limited, how can we ... More
Continuous Quantum Hypothesis TestingOct 23 2011Apr 27 2012I propose a general quantum hypothesis testing theory that enables one to test hypotheses about any aspect of a physical system, including its dynamics, based on a series of observations. For example, the hypotheses can be about the presence of a weak ... More
Time-Symmetric Quantum Theory of SmoothingApr 13 2009Jul 14 2009Smoothing is an estimation technique that takes into account both past and future observations, and can be more accurate than filtering alone. In this Letter, a quantum theory of smoothing is constructed using a time-symmetric formalism, thereby generalizing ... More
Galois module structure of the square root of the inverse different over maximal ordersJul 25 2016Let $K$ be a number field with ring of integers $\mathcal{O}_K$ and let $G$ be a \mbox{finite group of} odd order. Given a $G$-Galois $K$-algebra $K_h$, let $A_h$ be the square root of the inverse different of $K_h/K$, which exists by Hilbert's formula. ... More
On the Galois module structure of the square root of the inverse different in abelian extensionsJul 16 2014Jun 09 2015Let $K$ be a number field with ring of integers $\mathcal{O}_K$ and $G$ a finite group of odd order. If $K_h$ is a weakly ramified $G$-Galois $K$-algebra, then its square root $A_h$ of the inverse different is a locally free $\mathcal{O}_{K}G$-module ... More
N derivatives are necessary for order N+1 convergence in quadrature: a converse resultJan 28 2014Results on the error bounds of quadrature methods are well known - most state that if the method has degree N, and the integrand has N derivatives, then the error is order N+1. We prove here a converse: that if the integrand fails to have N derivatives, ... More
Volterra filters for quantum estimation and detectionSep 07 2015Dec 14 2015The implementation of optimal statistical inference protocols for high-dimensional quantum systems is often computationally expensive. To avoid the difficulties associated with optimal techniques, here I propose an alternative approach to quantum estimation ... More
Quantum transition-edge detectorsMay 08 2013Aug 14 2013Small perturbations to systems near critical points of quantum phase transitions can induce drastic changes in the system properties. Here I show that this sensitivity can be exploited for weak-signal detection applications. This is done by relating a ... More
Ultimate Energy Densities for Electromagnetic PulsesMar 06 2008The ultimate electric and magnetic energy densities that can be attained by bandlimited electromagnetic pulses in free space are calculated using an ab initio quantized treatment, and the quantum states of electromagnetic fields that achieve the ultimate ... More
On the Relationship between Resolution Enhancement and Multiphoton Absorption Rate in Quantum LithographyJul 17 2006Feb 28 2007The proposal of quantum lithography [Boto et al., Phys. Rev. Lett. 85, 2733 (2000)] is studied via a rigorous formalism. It is shown that, contrary to Boto et al.'s heuristic claim, the multiphoton absorption rate of a ``NOON'' quantum state is actually ... More
Hopf-Galois structures of isomorphic type on a non-abelian characteristically simple extensionNov 28 2018Mar 15 2019Let $L/K$ be a finite Galois extension whose Galois group $G$ is non-abelian and characteristically simple. Using tools from graph theory, we shall give a closed formula for the number of Hopf-Galois structures on $L/K$ with associated group isomorphic ... More
On the realizable classes of the square root of the inverse different in the unitary class groupSep 21 2015Dec 08 2015Let $K$ be a number field with ring of integers $\mathcal{O}_K$ and let $G$ be a finite abelian group of odd order. Given a $G$-Galois $K$-algebra $K_h$, let $A_h$ denote its square root of the inverse different, which exists by Hilbert's formula. If ... More
Multiparameter Heisenberg limitMar 17 2014Feb 01 2016Using a quantum version of the Bell-Ziv-Zakai bound, I derive a Heisenberg limit to multiparameter estimation for any Gaussian prior probability density. The mean-square error lower bound is shown to have a universal quadratic scaling with respect to ... More
Linear Corotation Torques in Non-Barotropic DisksOct 31 2013Jan 13 2014I derive a fully analytic expression for the linear corotation torque to first order in eccentricity for planets in non-barotropic protoplanetary disks, taking into account the effect of disk entropy gradients. This torque formula is applicable to both ... More
Protoplanetary Disk Resonances and Type I MigrationJul 20 2011Oct 03 2011Waves reflected by the inner edge of a protoplanetary disk are shown to significantly modify Type I migration, even allowing the trapping of planets near the inner disk edge for small planets in a range of disk parameters. This may inform the distribution ... More
Optimal waveform estimation for classical and quantum systems via time-symmetric smoothing. II. Applications to atomic magnetometry and Hardy's paradoxSep 13 2009The quantum smoothing theory [Tsang, Phys. Rev. Lett. 102, 250403 (2009); Phys. Rev. A, in press (e-print arXiv:0906.4133)] is extended to account for discrete jumps in the classical random process to be estimated, discrete variables in the quantum system, ... More
Optimal waveform estimation for classical and quantum systems via time-symmetric smoothingJun 22 2009Aug 11 2009Classical and quantum theories of time-symmetric smoothing, which can be used to optimally estimate waveforms in classical and quantum systems, are derived using a discrete-time approach, and the similarities between the two theories are emphasized. Application ... More
Decoherence of Quantum-Enhanced Timing AccuracyApr 05 2007Quantum enhancement of optical pulse timing accuracy is investigated in the Heisenberg picture. Effects of optical loss, group-velocity dispersion, and Kerr nonlinearity on the position and momentum of an optical pulse are studied via Heisenberg equations ... More
Quantum Imaging beyond the Diffraction Limit by Optical Centroid MeasurementsJan 30 2009Jun 22 2009I propose a quantum imaging method that can beat the Rayleigh-Abbe diffraction limit and achieve de Broglie resolution without requiring a multiphoton absorber as the detector. Using the same non-classical states of light as those for quantum lithography, ... More
Subdiffraction incoherent optical imaging via spatial-mode demultiplexingAug 09 2016I propose a spatial-mode demultiplexing (SPADE) scheme for the far-field imaging of arbitrary incoherent optical sources. For an object too small to be resolved by direct imaging under the diffraction limit, I show that SPADE can estimate the moments ... More
Video Contents Prior Storing Server for Optical Access NetworkApr 08 2015One of the most important multimedia applications is Internet protocol TV (IPTV) for next-generation networks. IPTV provides triple-play services that require high-speed access networks with the functions of multicasting and quality of service (QoS) guarantees. ... More
Spectral phase conjugation via extended phase matchingJun 15 2005Nov 21 2005It is shown that the copropagating three-wave-mixing parametric process, with appropriate type-II extended phase matching and pumped with a short second-harmonic pulse, can perform spectral phase conjugation and parametric amplification, which shows a ... More
Subdiffraction incoherent optical imaging via spatial-mode demultiplexingAug 09 2016Nov 15 2016I propose a spatial-mode demultiplexing (SPADE) measurement scheme for the far-field imaging of arbitrary incoherent optical sources. For any object too small to be resolved by direct imaging under the diffraction limit, I show that SPADE can estimate ... More
The parametrized probabilistic finite-state transducer probe game player fingerprint modelJan 29 2014Fingerprinting operators generate functional signatures of game players and are useful for their automated analysis independent of representation or encoding. The theory for a fingerprinting operator which returns the length-weighted probability of a ... More
Quantum metrology with open dynamical systemsJan 24 2013Jun 12 2013This paper studies quantum limits to dynamical sensors in the presence of decoherence. A modified purification approach is used to obtain tighter quantum detection and estimation error bounds for optical phase sensing and optomechanical force sensing. ... More
Ziv-Zakai Error Bounds for Quantum Parameter EstimationNov 15 2011May 10 2012I propose quantum versions of the Ziv-Zakai bounds as alternatives to the widely used quantum Cram\'er-Rao bounds for quantum parameter estimation. From a simple form of the proposed bounds, I derive both a "Heisenberg" error limit that scales with the ... More
Quantum Nonlocality in Weak-Thermal-Light InterferometryAug 08 2011Nov 17 2011In astronomy, interferometry of light collected by separate telescopes is often performed by physically bringing the optical paths together in the form of Young's double-slit experiment. Optical loss severely limits the efficiency of this so-called direct ... More
Realizable classes and embedding problemsFeb 07 2016Jul 25 2016Let $K$ be a number field with ring of integers $\mathcal{O}_K$ and let $G$ be a finite group. Given a $G$-Galois $K$-algebra $K_h$, let $\mathcal{O}_h$ denote its ring of integers. If $K_h/K$ is tame, then a classical theorem of E. Noether implies that ... More
Energy-Efficient Delay-Constrained Transmission and Sensing for Cognitive Radio SystemsMay 02 2012May 08 2012In this work we study energy-efficient transmission for Cognitive Radio (CR) which opportunistically operates on Primary User's (PU's) channel through spectrum sensing. Spectrum sensing and compulsory idling (for incumbent protection) introduce energy-overheads ... More
Charm physics with Moebius Domain Wall FermionsJan 04 2015We present results showing that Domain Wall fermions are a suitable discretisation for the simulation of heavy quarks. This is done by a continuum scaling study of charm quarks in a M\"obius Domain Wall formalism using a quenched set-up. We find that ... More
Isotopic Scaling in Nuclear ReactionsMar 26 2001A three parameter scaling relationship between isotopic distributions for elements with Z$\leq 8$ has been observed that allows a simple description of the dependence of such distributions on the overall isospin of the system. This scaling law (termed ... More
Charge carrier induced barrier height reduction at organic heterojunctionsAug 07 2008In order to provide an accurate theoretical description of current density voltage (J-V) characteristics of an organic heterojunction device over a wide range of electric fields at various temperatures, it is proposed that an accumulation of charge carriers ... More
Simultaneous Multi-frequency Topological Edge Modes between One-dimensional Photonic CrystalsFeb 11 2016Mar 09 2016We show theoretically that, in the limit of weak dispersion, one-dimensional (1D) binary centrosymmetric photonic crystals can support topological edge modes in all photonic band gaps. By analyzing their bulk band topology, these "harmonic" topological ... More
Improved mirror position estimation using resonant quantum smoothingMay 13 2015Quantum parameter estimation, the ability to precisely obtain a classical value in a quantum system, is very important to many key quantum technologies. Many of these technologies rely on an optical probe, either coherent or squeezed states to make a ... More
Optimal Hierarchical Radio Resource Management for HetNets with Flexible BackhaulApr 15 2015Apr 20 2018Providing backhaul connectivity for macro and pico base stations (BSs) constitutes a significant share of infrastructure costs in future heterogeneous networks (HetNets). To address this issue, the emerging idea of flexible backhaul is proposed. Under ... More
Charm physics with physical light and strange quarks using domain wall fermionsFeb 03 2015We present a study of charm physics using RBC/UKQCD 2+1 flavour physical point domain wall fermion ensembles for the light quarks as well as for the valence charm quark. After a brief motivation of domain wall fermions as a suitable heavy quark discretisation ... More
SU(3)-breaking ratios for $D_{(s)}$ and $B_{(s)}$ mesonsDec 20 2018We present results for the $SU(3)$ breaking ratios of decay constants $f_{D_s}/f_D$ and $f_{B_s}/f_B$ and - for the first time with physical pion masses - the ratio of bag parameters $B_{B_s}/B_{B_d}$, as well as the ratio $\xi$, forming the ratio of ... More
Neutron-proton asymmetry dependence of spectroscopic factors in Ar isotopesNov 25 2009Feb 24 2010Spectroscopic factors have been extracted for proton rich 34Ar and neutron rich 46Ar using the (p,d) neutron transfer reaction. The experimental results show little reduction of the ground state neutron spectroscopic factor of the proton rich nucleus ... More
The Discovery of an X-ray/UV Stellar Flare from the Late-K/Early-M Dwarf LMC 335May 28 2012We report the discovery of an X-ray/UV stellar flare from the source LMC 335, captured by XMM-Newton in the field of the Large Magellanic Cloud. The flare event was recorded continuously in X-ray for its first 10 hours from the precursor to the late decay ... More
Recent Tevatron Results on CP-ViolationAug 26 2014Sep 02 2014Using their full Tevatron Run II data sets, the CDF and D0 Experiments present measurements of CP-violating asymmetries in the charmless decay of bottom baryons Lambda-b => p pi-, Lambda-b => p K-, and also for Bs0 => K- pi+, B0 => K+ pi-, Ds => phi pi, ... More
Getting the astrophysics and particle physics of dark matter out of next-generation direct detection experimentsOct 25 2009Apr 06 2010The next decade will bring massive new data sets from experiments of the direct detection of weakly interacting massive particle (WIMP) dark matter. The primary goal of these experiments is to identify and characterize the dark-matter particle species. ... More
Dark matter in the solar system III: The distribution function of WIMPs at the Earth from gravitational captureFeb 09 2009In this last paper in a series of three on weakly interacting massive particle (WIMP) dark matter in the solar system, we focus on WIMPs bound to the system by gravitationally scattering off of planets. We present simulations of WIMP orbits in a toy solar ... More
Renewal theory and computable convergence rates for geometrically ergodic Markov chainsMar 24 2005We give computable bounds on the rate of convergence of the transition probabilities to the stationary distribution for a certain class of geometrically ergodic Markov chains. Our results are different from earlier estimates of Meyn and Tweedie, and from ... More
Tevatron Collider Operations and PlansJun 03 2004Run II of the Tevatron Collider is reviewed, emphasizing operations through March 15, 2004. The Run II Luminosity Upgrade plans and luminosity projections through 2009 are discussed.
WIMP astronomy and particle physics with liquid-noble and cryogenic direct-detection experimentsMar 26 2011Jan 18 2012Once weakly-interacting massive particles (WIMPs) are unambiguously detected in direct-detection experiments, the challenge will be to determine what one may infer from the data. Here, I examine the prospects for reconstructing the local speed distribution ... More
Mapping the allowed parameter space for decaying dark matter modelsJan 21 2010Apr 12 2010I consider constraints on a phenomenological decaying-dark-matter model, in which two weakly-interacting massive particle (WIMP) species have a small mass splitting, and in which the heavier particle decays to the lighter particle and a massless particle ... More
Dark matter in the solar system I: The distribution function of WIMPs at the Earth from solar captureFeb 09 2009The next generation of dark matter (DM) direct detection experiments and neutrino telescopes will probe large swaths of dark matter parameter space. In order to interpret the signals in these experiments, it is necessary to have good models of both the ... More
Dark matter in the solar system II: WIMP annihilation rates in the SunFeb 09 2009We calculate the annihilation rate of weakly interacting massive particles (WIMPs) in the Sun as a function of their mass and elastic scattering cross section. One byproduct of the annihilation, muon neutrinos, may be observed by the next generation of ... More
The role of cold and hot gas flows in feeding early-type galaxy formationOct 16 2014We study the evolution of the gaseous components in massive simulated galaxies and show that their early formation is fuelled by cold, low entropy gas streams. At lower redshifts of z<3 the simulated galaxies are massive enough to support stable virial ... More
Constant cross section of loops in the solar coronaSep 04 2012The corona of the Sun is dominated by emission from loop-like structures. When observed in X-ray or extreme ultraviolet emission, these million K hot coronal loops show a more or less constant cross section. In this study we show how the interplay of ... More
Assembly Histories and Observational Properties of Simulated Early-type GalaxiesOct 24 2012We demonstrate that massive simulated galaxies assemble in two phases, with the initial growth dominated by compact in situ star formation, whereas the late growth is dominated by accretion of old stars formed in subunits outside the main galaxy. We also ... More
Dark Matter: A Brief ReviewJan 18 2012From astronomical observations, we know that dark matter exists, makes up 23% of the mass budget of the Universe, clusters strongly to form the load-bearing frame of structure for galaxy formation, and hardly interacts with ordinary matter except gravitationally. ... More
Dark matter bound to the Solar System: consequences for annihilation searchesMay 15 2009One method to search for particle dark matter is to hunt down its annihilation products. In the Solar System, three potential types of signals of annihilation have been identified: neutrinos and gamma-rays from the Sun, and neutrinos from the Earth. Each ... More
An extended liouville equation for variable particle number systemsSep 28 1998Oct 07 1998It is well-known that the Liouville equation of statistical mechanics is restricted to systems where the total number of particles (N) is fixed. In this paper, we show how the Liouville equation can be extended to systems where the number of particles ... More
Survey of excited state neutron spectroscopic factors for Z=8-28 nucleiOct 10 2008Jan 14 2009We have extracted 565 neutron spectroscopic factors of sd and fp shell nuclei by systematically analyzing more than 2000 measured (d,p) angular distributions. We are able to compare 125 of the extracted spectroscopic factors to values predicted by large-basis ... More
Spectrum analysis with quantum dynamical systemsMar 07 2016Measuring the power spectral density of a stochastic process, such as a stochastic force or magnetic field, is a fundamental task in many sensing applications. Quantum noise is becoming a major limiting factor to such a task in future technology, especially ... More
Far-field Super-resolution of Thermal Electromagnetic Sources at the Quantum LimitApr 04 2016Jul 06 2016We obtain the ultimate quantum limit for estimating the transverse separation of two thermal point sources using a given imaging system with limited spatial bandwidth. Via the quantum Cramer-Rao bound, we show that, contrary to the Rayleigh limit in conventional ... More
Third Order Intermodulation Power Estimation for N Sinusoidal ChannelsNov 23 2013In this paper analysis is given to find the third order intermodulation power given sinusoids are fed into a nonlinear device. A simple expression of the third order intermodulation power is given for the case that the center frequencies of the input ... More
Corotational Instability of Inertial-Acoustic Modes in Black Hole Accretion Discs and Quasi-Periodic OscillationsOct 01 2008Nov 14 2008We study the global stability of non-axisymmetric p-modes (also called inertial-acoustic modes) trapped in the inner-most regions of accretion discs around black holes. We show that the lowest-order (highest-frequency) p-modes, with frequencies $\omega=(0.5-0.7) ... More