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Search Results: 1 - 10 of 433280 matches for " J. D. Hayward "
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String-Motivated Model
J. D. Hayward
Physics , 1995, DOI: 10.1103/PhysRevD.52.1019
Abstract: The two-dimensional model which emerges from low-energy considerations of string theory is written down. Solutions of this classical model are noted, including some examples which have nontrivial tachyon field. One such represents the classical backreaction of the tachyon field on the black hole for a two parameter set of tachyon potentials. Assuming the classical black hole background in the `Eddington-Finkelstein' gauge, the tachyon equation is separable and the radial part is solved by a hypergeometric function, which is in general of complex argument. A semi-classical prescription for including the quantum effects of the tachyon field is described, and the resulting equations of motion are found. Special solutions of these equations are written down.
Entropy in the RST Model
J. D. Hayward
Physics , 1994, DOI: 10.1103/PhysRevD.52.2239
Abstract: The RST Model is given boundary term and Z-field so that it is well-posed and local. The Euclidean method is described for general theory and used to calculate the RST intrinsic entropy. The evolution of this entropy for the shockwave solutions is found and obeys a second law.
Quantum Coherence in Two Dimensions
S. W. Hawking,J. D. Hayward
Physics , 1993, DOI: 10.1103/PhysRevD.49.5252
Abstract: The formation and evaporation of two dimensional black holes are discussed. It is shown that if the radiation in minimal scalars has positive energy, there must be a global event horizon or a naked singularity. The former would imply loss of quantum coherence while the latter would lead to an even worse breakdown of predictability. CPT invariance would suggest that there ought to be past horizons as well. A way in which this could happen with wormholes is described.
Optical Conductivity of a t--J Ladder
C. A. Hayward,D. Poilblanc,D. J. Scalapino
Physics , 1995, DOI: 10.1103/PhysRevB.53.R8863
Abstract: The optical conductivity $\sigma(\omega )$ of a doped two-leg t--J ladder is calculated for an electric field polarized parallel to the legs of the ladder. The conductivity has a Drude weight proportional to the hole doping and an apparent threshold for absorption (a pseudo gap) which may be associated with the energy to break a pair. This pseudogap in $\sigma (\omega )$ is present even though the pairs have a modified $d_{x^2-y^2}$-like wave function because the geometry of the ladder leads to quasi-particle states which probe the gap along an antinode.
Failure Mechanisms in Wet Tantalum Capacitors
D. Hayward
Active and Passive Electronic Components , 1976, DOI: 10.1155/apec.2.249
The merger-driven evolution of warm infrared luminous galaxies
J. D. Younger,C. C. Hayward,D. Narayanan,T. J. Cox,L. Hernquist,P. Jonsson
Physics , 2009, DOI: 10.1111/j.1745-3933.2009.00663.x
Abstract: We present a merger-driven evolutionary model for the production of luminous (LIRGs) and ultraluminous infrared galaxies (ULIRGs) with warm IR colours. Our results show that simulations of gas--rich major mergers including star formation, black hole growth, and feedback can produce warm (U)LIRGs. We also find that while the warm evolutionary phase is associated with increased AGN activity, star formation alone may be sufficient to produce warm IR colours. However, the transition can be suppressed entirely - even when there is a significant AGN contribution - when we assume a single-phase ISM, which maximizes the attenuation. Finally, our evolutionary models are consistent with the 25-to-60 micron flux density ratio vs. L_HX/L_IR relation for local LIRGs and ULIRGs, and predict the observed scatter in IR color at fixed L_HX/L_IR. Therefore, our models suggest a cautionary note in the interpretation of warm IR colours: while associated with periods of active black hole growth, they are probably produced by a complex mix of star formation and AGN activity intermediate between the cold star formation dominated phase and the birth of a bright, unobscured quasar.
Evidence for a superfluid density in t--J ladders
C. A. Hayward,D. Poilblanc,R,M. Noack,D. J. Scalapino,W. Hanke
Physics , 1995, DOI: 10.1103/PhysRevLett.75.926
Abstract: Applying three independent techniques, we give numerical evidence for a finite superfluid density in isotropic hole-doped t--J ladders: We show the existence of anomalous flux quantization, emphasising the contrasting behaviour to that found in the `Luttinger liquid' regime stabilised at low electron densities; We consider the nature of the low-lying excitation modes, finding the 1-D analog of the superconducting state; And using a density matrix renormalization group approach, we find long range pairing correlations and exponentially decaying spin-spin correlations.
Deciphering Interplay between Salmonella Invasion Effectors
Robert J. Cain equal contributor,Richard D. Hayward equal contributor,Vassilis Koronakis
PLOS Pathogens , 2008, DOI: 10.1371/journal.ppat.1000037
Abstract: Bacterial pathogens have evolved a specialized type III secretion system (T3SS) to translocate virulence effector proteins directly into eukaryotic target cells. Salmonellae deploy effectors that trigger localized actin reorganization to force their own entry into non-phagocytic host cells. Six effectors (SipC, SipA, SopE/2, SopB, SptP) can individually manipulate actin dynamics at the plasma membrane, which acts as a ‘signaling hub’ during Salmonella invasion. The extent of crosstalk between these spatially coincident effectors remains unknown. Here we describe trans and cis binary entry effector interplay (BENEFIT) screens that systematically examine functional associations between effectors following their delivery into the host cell. The results reveal extensive ordered synergistic and antagonistic relationships and their relative potency, and illuminate an unexpectedly sophisticated signaling network evolved through longstanding pathogen–host interaction.
The Star-Forming Molecular Gas in High Redshift Submillimeter Galaxies
Desika Narayanan,Thomas J. Cox,Christopher Hayward,Joshua D. Younger,Lars Hernquist
Physics , 2009, DOI: 10.1111/j.1365-2966.2009.15581.x
Abstract: We present a model for the CO molecular line emission from high redshift Submillimeter Galaxies (SMGs). By combining hydrodynamic simulations of gas rich galaxy mergers with the polychromatic radiative transfer code, Sunrise, and the 3D non-LTE molecular line radiative transfer code, Turtlebeach, we show that if SMGs are typically a transient phase of major mergers, their observed compact CO spatial extents, broad line widths, and high excitation conditions (CO SED) are naturally explained. In this sense, SMGs can be understood as scaled-up analogs to local ULIRGs. We utilize these models to investigate the usage of CO as an indicator of physical conditions. We find that care must be taken when applying standard techniques. The usage of CO line widths as a dynamical mass estimator from SMGs can possibly overestimate the true enclosed mass by a factor ~1.5-2. At the same time, assumptions of line ratios of unity from CO J=3-2 (and higher lying lines) to CO (J=1-0) will oftentimes lead to underestimates of the inferred gas mass. We provide tests for these models by outlining predictions for experiments which are imminently feasible with the current generation of bolometer arrays and radio-wave spectrometers.
Spin dynamics of the spin-Peierls compound CuGeO_3 under magnetic field
D. Poilblanc,J. Riera,C. A. Hayward,C. Berthier,M. Horvatic
Physics , 1997, DOI: 10.1103/PhysRevB.55.R11941
Abstract: The magnetic field--driven transition in the spin-Peierls system CuGeO_3 associated with the closing of the spin gap is investigated numerically. The field dependence of the spin dynamical structure factor (seen by inelastic neutron scattering) and of the momentum dependent static susceptibility are calculated. In the dimerized phase (H
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