The Case for Deep, Wide-Field Cosmology (2009)
Scranton, Ryan, Albrecht, Andreas, Caldwell, Robert, Cooray, Asantha, Dore, Olivier, Habib, Salman, ...
Much of the science case for the next generation of deep, wide-field optical/infrared surveys has been driven by the further study of dark energy. This is a laudable goal (and the subject of a...
Exploring Dark Energy with Next-Generation Photometric Redshift Surveys (2009)
Zhan, Hu, Albrecht, Andreas, Cooray, Asantha, Habib, Salman, Heavens, Alan, Heitmann, Katrin, ...
The coming decade will be an exciting period for dark energy research, during which astronomers will address the question of what drives the accelerated cosmic expansion as first revealed by type Ia...
Heitmann, Katrin, Higdon, David, White, Martin, Habib, Salman, Williams, Brian J., Wagner, Christian
The power spectrum of density fluctuations is a foundational source of cosmological information. Precision cosmological probes targeted primarily at investigations of dark energy require accurate...
The Coyote Universe I: Precision Determination of the Nonlinear Matter Power Spectrum (2008)
Heitmann, Katrin, White, Martin, Wagner, Christian, Habib, Salman, Higdon, David
Near-future cosmological observations targeted at investigations of dark energy pose stringent requirements on the accuracy of theoretical predictions for the clustering of matter. Currently, N-body...
Schneider, Michael D., Knox, Lloyd, Habib, Salman, Heitmann, Katrin, Higdon, David, Nakhleh, Charles
We describe an approximate statistical model for the sample variance distribution of the non-linear matter power spectrum that can be calibrated from limited numbers of simulations. Our model retains...
X-ray Observations of Optically Selected Giant Elliptical-Dominated Galaxy Groups (2008)
Voevodkin, Alexey, Miller, Christopher J., Borozdin, Konstantin, Heitmann, Katrin, Habib, Salman, Ricker, Paul, ...
We present a combined optical and X-ray analysis of three optically selected X-ray bright groups with giant elliptical galaxies in the center. These massive ellipticals were targeted for XMM-Newton...
The Structure of Halos: Implications for Group and Cluster Cosmology (2008)
Lukić, Zarija, Reed, Darren, Habib, Salman, Heitmann, Katrin
The dark matter halo mass function is a key repository of cosmological information over a wide range of mass scales, from individual galaxies to galaxy clusters. N-body simulations have established...
Quantum And Classical Dynamics Of Atoms In A Magneto-optical Lattice (2008)
Shohini Ghose, Paul M. Alsing, Ivan H. Deutsch, Poul Jessen, D. L. Haycock, Tanmoy Bhattacharya, ...
Abstract. The transport of ultra-cold atoms in magneto-optical potentials provides a clean setting in which to investigate the distinct predictions of classical versus quantum dynamics for a system...
Evrard, August E., Bialek, James, Busha, Michael T., White, Martin, Habib, Salman, Heitmann, Katrin, ...
Abstract not available.
Evrard, August E., Bialek, James, Busha, Michael T., White, Martin, Habib, Salman, Heitmann, Katrin, ...
Abstract not available.
Evrard, August E., Bialek, James, Busha, Michael T., White, Martin, Habib, Salman, Heitmann, Katrin, ...
Abstract not available.
Evrard, August E., Bialek, James, Busha, Michael T., White, Martin, Habib, Salman, Heitmann, Katrin, ...
Abstract not available.
Evrard, August E., Bialek, James, Busha, Michael T., White, Martin, Habib, Salman, Heitmann, Katrin, ...
Abstract not available.
Comment on "Gravitationally Induced Neutrino-Oscillation Phases" (2007)
Tanmoy Bhattacharya, Salman Habib, Emil Mottola
We critically examine the recent claim of a "new effect" of gravitationally induced quantum mechanical phases in neutrino oscillations. A straightforward exercise in the Schwarzschild...
Modeling Particle Accelerators using C++ and the POOMA Framework (2007)
Graham Mark, William F. Humphrey, Julian C. Cummings, Timothy J. Clel, Robert D. Ryne, Salman Habib
This paper concerns the use of C++ and the POOMA Framework [1] to model high-intensity particle accelerators. This work is part of the Computational Accelerator Physics Grand Challenge, sponsored by...
Energy-Momentum Tensor in an Expanding Universe (2007)
. We study a quantum scalar field in a de Sitter universe. The initial state of the system is of adiabatic order four, and not necessarily de Sitter invariant. We define an adiabatic number basis in...
The Cosmic Code Comparison Project (2007)
Heitmann, Katrin, Lukic, Zarija, Fasel, Patricia, Habib, Salman, Warren, Michael S., White, Martin, ...
Current and upcoming cosmological observations allow us to probe structures on smaller and smaller scales, entering highly nonlinear regimes. In order to obtain theoretical predictions in these...
The Halo Mass Function: High-Redshift Evolution and Universality (2007)
Lukic, Zarija, Heitmann, Katrin, Habib, Salman, Bashinsky, Sergei, Ricker, Paul M.
We study the formation of dark matter halos in the concordance LCDM model over a wide range of redshifts, from z=20 to the present. Our primary focus is the halo mass function, a key probe of...
Habib, Salman, Heitmann, Katrin, Higdon, David, Nakhleh, Charles, Williams, Brian
Several cosmological measurements have attained significant levels of maturity and accuracy over the last decade. Continuing this trend, future observations promise measurements of the statistics of...
Semiclassics of the Chaotic Quantum-Classical Transition (2006)
Greenbaum, Benjamin D., Habib, Salman, Shizume, Kosuke, Sundaram, Bala
We elucidate the basic physical mechanisms responsible for the quantum-classical transition in one-dimensional, bounded chaotic systems subject to unconditioned environmental interactions. We show...
Feedback cooling of atomic motion in cavity QED (2006)
Steck, Daniel A., Jacobs, Kurt, Mabuchi, Hideo, Habib, Salman, Bhattacharya, Tanmoy
We consider the problem of controlling the motion of an atom trapped in an optical cavity using continuous feedback. In order to realize such a scheme experimentally, one must be able to perform...
Heitmann, Katrin, Higdon, David, Nakhleh, Charles, Habib, Salman
The complexity and accuracy of current and future precision cosmology observational campaigns has made it essential to develop an efficient technique for directly combining simulation and...
Capturing Halos at High Redshifts (2006)
Heitmann, Katrin, Lukic, Zarija, Habib, Salman, Ricker, Paul M.
We study the evolution of the mass function of dark matter halos in the concordance LCDM model at high redshift. We employ overlapping (multiple-realization) numerical simulations to cover a wide...
Nonequilibrium and Nonlinear Dynamics in Geomaterials I : The Low Strain Regime (2006)
Pasqualini, Donatella, Heitmann, Katrin, TenCate, James A., Habib, Salman, Higdon, David, Johnson, Paul A.
Members of a wide class of geomaterials are known to display complex and fascinating nonlinear and nonequilibrium dynamical behaviors over a wide range of bulk strains, down to surprisingly low...
Emergence of chaos in quantum systems far from the classical limit (2006)
Habib, Salman, Jacobs, Kurt Aaron, Shizume, Kosuke
Yes
Feedback cooling of atomic motion in cavity QED (2006)
Steck, Daniel A., Jacobs, Kurt Aaron, Mabuchi, Hideo, Habib, Salman, Bhattacharya, Tanmoy
Yes
Emergence of chaos in quantum systems far from the classical limit (2006)
Habib, Salman, Jacobs, Kurt Aaron, Shizume, Kosuke
Yes
Feedback cooling of atomic motion in cavity QED (2006)
Steck, Daniel A., Jacobs, Kurt Aaron, Mabuchi, Hideo, Habib, Salman, Bhattacharya, Tanmoy
Yes
Feedback cooling of atomic motion in cavity QED (2006)
Steck, Daniel A., Jacobs, Kurt Aaron, Mabuchi, Hideo, Habib, Salman, Bhattacharya, Tanmoy
Feedback cooling of atomic motion in cavity QED (2006)
Steck, Daniel A., Jacobs, Kurt Aaron, Mabuchi, Hideo, Habib, Salman, Bhattacharya, Tanmoy
Shapes and Sizes of Voids in the LCDM Universe: Excursion Set Approach (2005)
Shandarin, Sergei, Feldman, Hume A., Heitmann, Katrin, Habib, Salman
We study the global distribution and morphology of dark matter voids in a LCDM universe using density fields generated by N-body simulations. Voids are defined as isolated regions of the low-density...
A Faraday Rotation Search for Magnetic Fields in Large Scale Structure (2005)
Xu, Yongzhong, Kronberg, Philipp P., Habib, Salman, Dufton, Quentin W.
Faraday rotation of radio source polarization provides a measure of the integrated magnetic field along the observational lines of sight. We compare a new, large sample of Faraday rotation measures...
Feedback cooling of atomic motion in cavity QED (2005)
Steck, Daniel A., Jacobs, Kurt, Mabuchi, Hideo, Habib, Salman, Bhattacharya, Tanmoy
We consider the problem of controlling the motion of an atom trapped in an optical cavity using continuous feedback. In order to realize such a scheme experimentally, one must be able to perform...
Crotts, Arlin, Garnavich, Peter, Priedhorsky, William, Habib, Salman, Heitmann, Katrin, Wang, Yun, ...
JEDI will probe dark energy in three independent ways by measuring the expansion history of the universe: (1) using type Ia supernovae as cosmological standard candles over a range of distances, (2)...
Chaos and Quantum Mechanics (2005)
Habib, Salman, Bhattacharya, Tanmoy, Greenbaum, Benjamin, Jacobs, Kurt, Shizume, Kosuke, Sundaram, Bala
The relationship between chaos and quantum mechanics has been somewhat uneasy -- even stormy, in the minds of some people. However, much of the confusion may stem from inappropriate comparisons using...
Nonlinear Quantum Dynamics (2005)
Habib, Salman, Bhattacharya, Tanmoy, Doherty, Andrew, Greenbaum, Benjamin, Hopkins, Asa, Jacobs, Kurt, ...
The vast majority of the literature dealing with quantum dynamics is concerned with linear evolution of the wave function or the density matrix. A complete dynamical description requires a full...
Lidz, Adam, Heitmann, Katrin, Hui, Lam, Habib, Salman, Rauch, Michael, Sargent, Wallace L. W.
The analysis of the Lyman-alpha forest of absorption lines in quasar spectra has emerged as a potentially powerful technique to constrain the linear matter power spectrum. In most previous work, the...
Inflationary Perturbations and Precision Cosmology (2005)
Habib, Salman, Heinen, Andreas, Heitmann, Katrin, Jungman, Gerard
Inflationary cosmology provides a natural mechanism for the generation of primordial perturbations which seed the formation of observed cosmic structure and lead to specific signals of anisotropy in...
The Quantum Emergence of Chaos (2004)
Habib, Salman, Jacobs, Kurt, Shizume, Kosuke
The dynamical status of isolated quantum systems, partly due to the linearity of the Schrodinger equation is unclear: Conventional measures fail to detect chaos in such systems. However, when quantum...
Robustness of Cosmological Simulations I: Large Scale Structure (2004)
Heitmann, Katrin, Ricker, Paul M., Warren, Michael S., Habib, Salman
The gravitationally-driven evolution of cold dark matter dominates the formation of structure in the Universe over a wide range of length scales. While the longest scales can be treated by...
The Nonlinear Cosmological Matter Power Spectrum with Massive Neutrinos I: The Halo Model (2004)
Abazajian, Kevork, Switzer, Eric R., Dodelson, Scott, Heitmann, Katrin, Habib, Salman
Measurements of the linear power spectrum of galaxies have placed tight constraints on neutrino masses. We extend the framework of the halo model of cosmological nonlinear matter clustering to...
Inverse-Scattering Theory and the Density Perturbations from Inflation (2004)
Habib, Salman, Heitmann, Katrin, Jungman, Gerard
Inflationary cosmology provides a successful paradigm for solving several problems, notably the generation of density perturbations which seed the formation of observed cosmic structure. We show how...
The Emergence of Classical Dynamics in a Quantum World (2004)
Bhattacharya, Tanmoy, Habib, Salman, Jacobs, Kurt
Ever since the advent of quantum mechanics, it has been clear that the atoms composing matter do not obey Newton's laws. Instead, their behavior is described by the Schroedinger equation....
Quantum feedback control of atomic motion in an optical cavity (2004)
Steck, Daniel A., Jacobs, Kurt, Mabuchi, Hideo, Bhattacharya, Tanmoy, Habib, Salman
We study quantum feedback cooling of atomic motion in an optical cavity. We design a feedback algorithm that can cool the atom to the ground state of the optical potential with high efficiency...
Characterizing Inflationary Perturbations: The Uniform Approximation (2004)
Habib, Salman, Heinen, Andreas, Heitmann, Katrin, Jungman, Gerard, Molina-Paris, Carmen
The spectrum of primordial fluctuations from inflation can be obtained using a mathematically controlled, and systematically extendable, uniform approximation. Closed-form expressions for power...
Gaussian Dynamics is Classical Dynamics (2004)
A direct comparison of quantum and classical dynamical systems can be accomplished through the use of distribution functions. This is useful for both fundamental investigations such as the nature of...
Nonlinear and Nonequilibrium Dynamics in Geomaterials (2004)
TenCate, James A., Pasqualini, Donatella, Habib, Salman, Heitmann, Katrin, Higdon, David, Johnson, Paul A.
The transition from linear to nonlinear dynamical elasticity in rocks is of considerable interest in seismic wave propagation as well as in understanding the basic dynamical processes in consolidated...
The Semiclassical Regime of the Chaotic Quantum-Classical Transition (2004)
Greenbaum, Benjamin D., Habib, Salman, Shizume, Kosuke, Sundaram, Bala
An analysis of the semiclassical regime of the quantum-classical transition is given for open, bounded, one dimensional chaotic dynamical systems. Environmental fluctuations -- characteristic of all...
Quantum Feedback Control of Atomic Motion in an Optical Cavity (2004)
Steck, Daniel A., Jacobs, Kurt Aaron, Mabuchi, Hideo, Bhattacharya, Tanmoy, Habib, Salman
We study quantum feedback cooling of atomic motion in an optical cavity. We design a feedback algorithm that can cool the atom to the ground state of the optical potential with high efficiency...
Cooling a Nano-Mechanical Resonator using Feedback: Towards Quantum Behavior (2004)
Hopkins, Asa, Jacobs, Kurt Aaron, Habib, Salman, Schwab, Keith
No
Quantum Feedback Control of Atomic Motion in an Optical Cavity (2004)
Steck, Daniel A., Jacobs, Kurt Aaron, Mabuchi, Hideo, Bhattacharya, Tanmoy, Habib, Salman
We study quantum feedback cooling of atomic motion in an optical cavity. We design a feedback algorithm that can cool the atom to the ground state of the optical potential with high efficiency...
Cooling a Nano-Mechanical Resonator using Feedback: Towards Quantum Behavior (2004)
Hopkins, Asa, Jacobs, Kurt Aaron, Habib, Salman, Schwab, Keith
No
Quantum Feedback Control of Atomic Motion in an Optical Cavity (2004)
Steck, Daniel A., Jacobs, Kurt Aaron, Mabuchi, Hideo, Bhattacharya, Tanmoy, Habib, Salman
We study quantum feedback cooling of atomic motion in an optical cavity. We design a feedback algorithm that can cool the atom to the ground state of the optical potential with high efficiency...
Cooling a Nano-Mechanical Resonator using Feedback: Towards Quantum Behavior (2004)
Hopkins, Asa, Jacobs, Kurt Aaron, Habib, Salman, Schwab, Keith
Quantum Feedback Control of Atomic Motion in an Optical Cavity (2004)
Steck, Daniel A., Jacobs, Kurt Aaron, Mabuchi, Hideo, Bhattacharya, Tanmoy, Habib, Salman
We study quantum feedback cooling of atomic motion in an optical cavity. We design a feedback algorithm that can cool the atom to the ground state of the optical potential with high efficiency...
Cooling a Nano-Mechanical Resonator using Feedback: Towards Quantum Behavior (2004)
Hopkins, Asa, Jacobs, Kurt Aaron, Habib, Salman, Schwab, Keith
Quantum Feedback Control of Atomic Motion in an Optical Cavity (2003)
Steck, Daniel A., Jacobs, Kurt, Mabuchi, Hideo, Bhattacharya, Tanmoy, Habib, Salman
We study quantum feedback cooling of atomic motion in an optical cavity as a prototypical nonlinear quantum control problem. We design a feedback algorithm that can cool the atom to the ground state...
The transition to classical chaos in a coupled quantum system through continuous measurement (2003)
Ghose, Shohini, Alsing, Paul, Deutsch, Ivan, Bhattacharya, Tanmoy, Habib, Salman, Jacobs, Kurt
Continuous observation of a quantum system yields a measurement record that faithfully reproduces the classically predicted trajectory provided that the measurement is sufficiently strong to localize...
Feedback cooling of a nanomechanical resonator (2003)
Hopkins, Asa, Jacobs, Kurt, Habib, Salman, Schwab, Keith
Cooled, low-loss nanomechanical resonators offer the prospect of directly observing the quantum dynamics of mesoscopic systems. However, the present state of the art requires cooling down to the...
Continuous Quantum Measurement and the Quantum to Classical Transition (2002)
Bhattacharya, Tanmoy, Habib, Salman, Jacobs, Kurt
While ultimately they are described by quantum mechanics, macroscopic mechanical systems are nevertheless observed to follow the trajectories predicted by classical mechanics. Hence, in the regime...
Quantum And Classical Dynamics Of Atoms In A Magneto-optical Lattice (2002)
Ghose, Shohini, Alsing, Paul M., Deutsch, Ivan H., Jessen, Poul S., Haycock, David L., Bhattacharya, Tanmoy, ...
The transport of ultra-cold atoms in magneto-optical potentials provides a clean setting in which to investigate the distinct predictions of classical versus quantum dynamics for a system with...
The Inflationary Perturbation Spectrum (2002)
Habib, Salman, Heitmann, Katrin, Jungman, Gerard, Molina-Paris, Carmen
Motivated by the prospect of testing inflation from precision cosmic microwave background observations, we present analytic results for scalar and tensor perturbations in single-field inflation...
Recovering classical dynamics from coupled quantum systems through continuous measurement (2002)
Ghose, Shohini, Alsing, Paul M., Deutsch, Ivan H., Bhattacharya, Tanmoy, Habib, Salman, Jacobs, Kurt
We study the role of continuous measurement in the quantum to classical transition for a system with coupled internal (spin) and external (motional) degrees of freedom. Even when the measured...
Quantum-Classical Transition in Nonlinear Dynamical Systems (2002)
Habib, Salman, Jacobs, Kurt, Mabuchi, Hideo, Ryne, Robert, Shizume, Kosuke, Sundaram, Bala
Viewed as approximations to quantum mechanics, classical evolutions can violate the positive semidefiniteness of the density matrix. The nature of the violation suggests a classification of dynamical...
The delta-function-kicked rotor: Momentum diffusion and the quantum-classical boundary (2001)
Bhattacharya, Tanmoy, Habib, Salman, Jacobs, Kurt, Shizume, Kosuke
We investigate the quantum-classical transition in the delta-kicked rotor and the attainment of the classical limit in terms of measurement-induced state-localization. It is possible to study the...
Robust control in the quantum domain (2001)
Doherty, Andrew, Doyle, John, Mabuchi, Hideo, Jacobs, Kurt, Habib, Salman
Recent progress in quantum physics has made it possible to perform experiments in which individual quantum systems are monitored and manipulated in real time. The advent of such new technical...
The Quantum-Classical Transition in Nonlinear Dynamical Systems (2000)
Habib, Salman, Jacobs, Kurt, Mabuchi, Hideo, Ryne, Robert, Shizume, Kosuke, Sundaram, Bala
Viewed as approximations to quantum mechanics, classical evolutions can violate the positive-semidefiniteness of the density matrix. The nature of this violation suggests a classification of...
A Second-Order Stochastic Leap-Frog Algorithm for Langevin Simulation (2000)
Langevin simulation provides an effective way to study collisional effects in beams by reducing the six-dimensional Fokker-Planck equation to a group of stochastic ordinary differential equations....
Quantum feedback control and classical control theory (2000)
Doherty, Andrew C., Habib, Salman, Jacobs, Kurt, Mabuchi, Hideo, Tan, Sze M.
We introduce and discuss the problem of quantum feedback control in the context of established formulations of classical control theory, examining conceptual analogies and essential differences. We...
Attractor states and infrared scaling in de Sitter space (2000)
Anderson, Paul R., Eaker, Wayne, Habib, Salman, Molina-Paris, Carmen, Mottola, Emil
The renormalized expectation value of the energy-momentum tensor for a scalar field with any mass m and curvature coupling xi is studied for an arbitrary homogeneous and isotropic physical initial...
Exact and approximate dynamics of the quantum mechanical O(N) model (2000)
Mihaila, Bogdan, Athan, Tara, Cooper, Fred, Dawson, John, Habib, Salman
We study a quantum dynamical system of N, O(N) symmetric, nonlinear oscillators as a toy model to investigate the systematics of a 1/N expansion. The closed time path (CTP) formalism melded with an...
Robust control in the quantum domain (2000)
Doherty, Andrew, Doyle, John, Mabuchi, Hideo, Jacobs, Kurt, Habib, Salman
Progress in quantum physics has made it possible to perform experiments in which individual quantum systems are monitored and manipulated in real time. The advent of such new technical capabilities...
A Second-Order Stochastic Leap-Frog Algorithm for Multiplicative Noise Brownian Motion (1999)
A stochastic leap-frog algorithm for the numerical integration of Brownian motion stochastic differential equations with multiplicative noise is proposed and tested. The algorithm has a second-order...
Quantum feedback control and classical control theory (1999)
Doherty, Andrew C., Habib, Salman, Jacobs, Kurt, Mabuchi, Hideo, Tan, Sze M.
We introduce and discuss the problem of quantum feedback control in the context of established formulations of classical control theory, examining conceptual analogies and essential differences. We...
Computation of the Lyapunov spectrum for continuous-time dynamical systems and discrete maps (1999)
Janaki, TM, Rangarajan, Govindan, Habib, Salman, Ryne, Robert D
In this paper, we describe in detail a method of computing Lyapunov exponents for a continuous-time dynamical system and extend the method to discrete maps. Using this method, a partial Lyapunov...
Dynamics of Kinks: Nucleation, Diffusion and Annihilation (1999)
We investigate the nucleation, annihilation, and dynamics of kinks in a classical (1+1)-dimensional Phi^4 field theory at finite temperature. From large scale Langevin simulations, we establish that...
Thermal vortex dynamics in a two-dimensional condensate (1999)
Sasik, R., Bettencourt, Luis M. A., Habib, Salman
We carry out an analytical and numerical study of the motion of an isolated vortex in thermal equilibrium, the vortex being defined as the point singularity of a complex scalar field $\psi(\r,t)$...
Energy-Momentum Tensor of Particles Created in an Expanding Universe (1999)
Habib, Salman, Molina-Paris, Carmen, Mottola, Emil
We present a general formulation of the time-dependent initial value problem for a quantum scalar field of arbitrary mass and curvature coupling in a FRW cosmological model. We introduce an adiabatic...
Continuous Quantum Measurement and the Emergence of Classical Chaos (1999)
Bhattacharya, Tanmoy, Habib, Salman, Jacobs, Kurt
We formulate the conditions under which the dynamics of a continuously measured quantum system becomes indistinguishable from that of the corresponding classical system. In particular, we demonstrate...
Controlling One-Dimensional Langevin Dynamics on the Lattice (1999)
Bettencourt, Luis M. A., Habib, Salman, Lythe, Grant
Stochastic evolutions of classical field theories have recently become popular in the study of problems such as determination of the rates of topological transitions and the statistical mechanics of...
The quantum roll in d-dimensions and the large-d expansion (1998)
Mihaila, Bogdan, Dawson, John F., Cooper, Fred, Brewster, Mary, Habib, Salman
We investigate the quantum roll for a particle in a $d$-dimensional ``Mexican hat'' potential in quantum mechanics, comparing numerical simulations in $d$-dimensions with the results of a large-$d$...
Statistical Mechanics of Double sinh-Gordon Kinks (1998)
Habib, Salman, Khare, Avinash, Saxena, Avadh
We study the classical thermodynamics of the double sinh-Gordon (DSHG) theory in 1+1 dimensions. This model theory has a double well potential, thus allowing for the existence of kinks and antikinks....
Does Inflationary Particle Production suggest Omega_m < 1? (1998)
We study a class of FRW spacetimes with a nonminimally coupled light massive scalar field. Values of the coupling parameter xi
How Wigner Functions Transform Under Symplectic Maps (1998)
It is shown that, while Wigner and Liouville functions transform in an identical way under linear symplectic maps, in general they do not transform identically for nonlinear symplectic maps. Instead...
Lyapunov Exponents without Rescaling and Reorthogonalization (1998)
Rangarajan, Govindan, Habib, Salman, Ryne, Robert D
We present a new method for the computation of Lyapunov exponents utilizing representations of orthogonal matrices applied to decompositions of M or $M \~{M}$ where M is the tangent map. This method...
Decoherence, Chaos, and the Correspondence Principle (1998)
Habib, Salman, Shizume, Kosuke, Zurek, Wojciech Hubert
We present evidence that decoherence can produce a smooth quantum-to-classical transition in nonlinear dynamical systems. High-resolution tracking of quantum and classical evolutions reveals...
Lyapunov Exponents without Rescaling and Reorthogonalization (1998)
Rangarajan, Govindan, Habib, Salman, Ryne, Robert D.
We present a new method for the computation of Lyapunov exponents utilizing representations of orthogonal matrices applied to decompositions of M or MM_trans where M is the tangent map. This method...
Lyapunov Exponents without Rescaling and Reorthogonalization (1998)
Rangarajan, Govindan, Habib, Salman, Ryne, Robert D
We present a new method for the computation of Lyapunov exponents utilizing representations of orthogonal matrices applied to decompositions of M or $M \~{M}$ where M is the tangent map. This method...
Exact Thermodynamics of the Double sinh-Gordon Theory in 1+1-Dimensions (1997)
Khare, Avinash, Habib, Salman, Saxena, Avadh
We study the classical thermodynamics of a 1+1-dimensional double-well sinh-Gordon theory. Remarkably, the Schrodinger-like equation resulting from the transfer integral method is quasi-exactly...
Nonequilibrium Dynamics of Symmetry Breaking in Lambda Phi^4 Field Theory (1996)
Cooper, Fred, Habib, Salman, Kluger, Yuval, Mottola, Emil
The time evolution of O(N) symmetric lambda Phi^4 scalar field theory is studied in the large N limit. In this limit the mean field and two-point correlation function evolve together as a...
Chaos in Time Dependent Variational Approximations to Quantum Dynamics (1996)
Cooper, Fred, Dawson, John, Habib, Salman, Ryne, Robert D.
Dynamical chaos has recently been shown to exist in the Gaussian approximation in quantum mechanics and in the self-consistent mean field approach to studying the dynamics of quantum fields. In this...
Winding Transitions at Finite Energy and Temperature: An O(3) Model (1996)
Habib, Salman, Mottola, Emil, Tinyakov, Peter
Winding number transitions in the two dimensional softly broken O(3) nonlinear sigma model are studied at finite energy and temperature. New periodic instanton solutions which dominate the...
Comment on "Gravitationally Induced Neutrino-Oscillation Phases" (1996)
Bhattacharya, Tanmoy, Habib, Salman, Mottola, Emil
We critically examine the recent claim (gr-qc/9603008) of a ``new effect'' of gravitationally induced quantum mechanical phases in neutrino oscillations. A straightforward exercise in the...
Dissipation and Decoherence in Mean Field Theory (1995)
Habib, Salman, Kluger, Yuval, Mottola, Emil, Paz, Juan Pablo
The time evolution of a closed system of mean fields and fluctuations is Hamiltonian, with the canonical variables parameterizing the general time-dependent Gaussian density matrix of the system....
Classical Dynamics for Linear Systems: The Case of Quantum Brownian Motion (1995)
It has long been recognized that the dynamics of linear quantum systems is classical in the Wigner representation. Yet many conceptually important linear problems are typically analyzed using such...
Statistical Mechanics of Nonlinear Coherent Structures: Kinks in the Phi^6 Model (1995)
We study the thermodynamics of kinks in the Phi^6 model using a Langevin code implemented on a massively parallel computer. This code can be used to study first order dynamical phase transitions...
Phi^4 Kinks: Statistical Mechanics (1994)
Some recent investigations of the thermal equilibrium properties of kinks in a $1+1$-dimensional, classical $\Phi^4$ field theory are reviewed. The distribution function, kink density, correlation...
Finite Energy Instantons in the O(3) Non-Linear Sigma Model (1994)
Tinyakov, Peter G., Mottola, Emil, Habib, Salman
We consider winding number transitions in the two dimensional O(3) non-linear sigma model, modified by a suitable conformal symmetry breaking term. We discuss the general properties of the relevant...
Semiquantum Chaos and the Large N Expansion (1994)
Cooper, Fred, Dawson, John, Habib, Salman, Kluger, Yuval, Meredith, Dawn, Shepard, Harvey
We consider the dynamical system consisting of a quantum degree of freedom $A$ interacting with $N$ quantum oscillators described by the Lagrangian \bq L = {1\over 2}\dot{A}^2 + \sum_{i=1}^{N}...
Symplectic Computation of Lyapunov Exponents (1994)
Habib, Salman, Ryne, Robert D.
A recently developed method for the calculation of Lyapunov exponents of dynamical systems is described. The method is applicable whenever the linearized dynamics is Hamiltonian. By utilizing the...
We consider a simple quantum system subjected to a classical random force. Under certain conditions it is shown that the noise-averaged Wigner function of the system follows an integro-differential...
Chaos and Noise in Galactic Potentials (1994)
Habib, Salman, Kandrup, Henry E., Mahon, M. Elaine
ABBREVIATED ABSTRACT: This paper summarises an investigation of the effects of weak friction and noise in time-independent, nonintegrable potentials which admit both regular and stochastic orbits....
Symplectic Calculation of Lyapunov Exponents (1994)
Habib, Salman, Ryne, Robert D.
The Lyapunov exponents of a chaotic system quantify the exponential divergence of initially nearby trajectories. For Hamiltonian systems the exponents are related to the eigenvalues of a symplectic...
Chaos and Noise in a Truncated Toda Potential (1994)
Habib, Salman, Kandrup, Henry E., Mahon, M. Elaine
Results are reported from a numerical investigation of orbits in a truncated Toda potential which is perturbed by weak friction and noise. Two significant conclusions are shown to emerge: (1) Despite...
Habib, Salman, Holz, Daniel E., Kheyfets, Arkady, Matzner, Richard A., Miller, Warner A., Tolman, Brian W.
LAGEOS is an accurately-tracked, dense spherical satellite covered with 426 retroreflectors. The tracking accuracy is such as to yield a medium term (years to decades) inertial reference frame...
Non-Equilibrium Quantum Fields in the Large N Expansion (1994)
Cooper, Fred, Habib, Salman, Kluger, Yuval, Mottola, Emil, Paz, Juan Pablo, Anderson, Paul R.
An effective action technique for the time evolution of a closed system consisting of one or more mean fields interacting with their quantum fluctuations is presented. By marrying large $N$ expansion...
Alexander, Francis J., Habib, Salman, Kovner, Alex
We investigate the thermal equilibrium properties of kinks in a classical $\F^4$ field theory in $1+1$ dimensions. From large scale Langevin simulations we identify the temperature below which a...
Multiplicative Noise: Applications in Cosmology and Field Theory (1993)
Physical situations involving multiplicative noise arise generically in cosmology and field theory. In this paper, the focus is first on exact nonlinear Langevin equations, appropriate in a...
Statistical Mechanics of Kinks in (1+1)-Dimensions (1992)
Alexander, Francis J., Habib, Salman
We investigate the thermal equilibrium properties of kinks in a classical $\phi^4$ field theory in $1+1$ dimensions. The distribution function, kink density, and correlation function are determined...
Nonlinear Noise in Cosmology (1992)
Habib, Salman, Kandrup, Henry E.
This paper derives and analyzes exact, nonlocal Langevin equations appropriate in a cosmological setting to describe the interaction of some collective degree of freedom with a surrounding...
Stochastic Inflation:The Quantum Phase Space Approach (1992)
In this paper a quantum mechanical phase space picture is constructed for coarse-grained free quantum fields in an inflationary Universe. The appropriate stochastic quantum Liouville equation is...
Quantum fields in curved spaces : kinetic theory / (1988)
Thesis (Ph. D.)--University of Maryland at College Park, 1988.
Robert Ryne Salman, Salman Habib, Thomas P. Wangler
Beam halo is an important issue for accelerator driven transmutation technologies and other applications of CW proton accelerators. These projects include, for example, the accelerator transmutation...