Bouncing and cyclic string gas cosmologies (2008)
Greene, Brian, Kabat, Daniel, Marnerides, Stefanos
We show that, in the presence of a string gas, simple higher-derivative modifications to the effective action for gravity can lead to bouncing and cyclic cosmological models. The modifications bound...
Pseudo-redundant vacuum energy (2008)
Batra, Puneet, Hinterbichler, Kurt, Hui, Lam, Kabat, Daniel
We discuss models that can account for today's dark energy. The underlying cosmological constant may be Planck scale but starts as a redundant coupling which can be eliminated by a field...
Eikonal Quantum Gravity and Planckian Scattering* (2007)
(D.O.E.) under contract #DE-AC02-76ER03069.
Canonical Quantization And Braid Invariance Of 2+1 Gravity Coupled To Point (2007)
Particles Daniel, Daniel Kabat, Miguel E. Ortiz
: We investigate the canonical quantization of gravity coupled to pointlike matter in 2+1 dimensions, starting from the usual point particle action, and working in the first order formalism. By...
Local bulk operators in AdS/CFT and the fate of the BTZ singularity (2007)
Hamilton, Alex, Kabat, Daniel, Lifschytz, Gilad, Lowe, David A.
This paper has two parts. First we review the description of local bulk operators in Lorentzian AdS in terms of non-local operators in the boundary CFT. We discuss how bulk locality arises in pure...
Local bulk operators in AdS/CFT: A holographic description of the black hole interior (2006)
Hamilton, Alex, Kabat, Daniel, Lifschytz, Gilad, Lowe, David A.
To gain insight into how bulk locality emerges from the holographic conformal field theory, we reformulate the bulk to boundary map in as local a way as possible. In previous work, we carried out...
Holographic representation of local bulk operators (2006)
Hamilton, Alex, Kabat, Daniel, Lifschytz, Gilad, Lowe, David A.
The Lorentzian AdS/CFT correspondence implies a map between local operators in supergravity and non-local operators in the CFT. By explicit computation we construct CFT operators which are dual to...
A note on the Coulomb branch of susy Yang-Mills (2005)
Kabat, Daniel, Lifschytz, Gilad
We compute the force between oppositely charged W bosons in the large N limit of Yang-Mills with 16 supercharges broken to SU(N) x U(1) by a finite Higgs vev. We clarify some issues regarding Wilson...
Local bulk operators in AdS/CFT: a boundary view of horizons and locality (2005)
Hamilton, Alex, Kabat, Daniel, Lifschytz, Gilad, Lowe, David A.
We develop the representation of local bulk fields in AdS by non-local operators on the boundary, working in the semiclassical limit and using AdS_2 as our main example. In global coordinates we show...
String windings in the early universe (2004)
Easther, Richard, Greene, Brian R., Jackson, Mark G., Kabat, Daniel
We study string dynamics in the early universe. Our motivation is the proposal of Brandenberger and Vafa, that string winding modes may play a key role in decompactifying three spatial dimensions. We...
A First-Quantized Formalism for Cosmological Particle Production (2003)
Hamilton, Alex J., Kabat, Daniel, Parikh, Maulik K.
We show that the amount of particle production in an arbitrary cosmological background can be determined using only the late-time positive-frequency modes. We don't refer to modes at early times, so...
Brane gases in the early universe: thermodynamics and cosmology (2003)
Easther, Richard, Greene, Brian R., Jackson, Mark G., Kabat, Daniel
We consider the thermodynamic and cosmological properties of brane gases in the early universe. Working in the low energy limit of M-theory we assume the universe is a homogeneous but anisotropic...
Stretched horizons, quasiparticles and quasinormal modes (2003)
Iizuka, Norihiro, Kabat, Daniel, Lifschytz, Gilad, Lowe, David A.
We propose that stretched horizons can be described in terms of a gas of non-interacting quasiparticles. The quasiparticles are unstable, with a lifetime set by the imaginary part of the lowest...
Quasiparticle picture of black holes and the entropy--area relation (2002)
Iizuka, Norihiro, Kabat, Daniel, Lifschytz, Gilad, Lowe, David A.
We propose an effective description of 0-brane black holes, in which the black hole is modeled as a gas of non-interacting quasi-particles in the dual quantum mechanics. This simple model is shown to...
Brane gas cosmology in M-theory: late time behavior (2002)
Easther, Richard, Greene, Brian R., Jackson, Mark G., Kabat, Daniel
We investigate the late-time behavior of a universe containing a supergravity gas and wrapped 2-branes in the context of M-theory compactified on T^10. The supergravity gas tends to drive uniform...
QCD vacuum structure in strong magnetic fields (2002)
Kabat, Daniel, Lee, Kimyeong, Weinberg, Erick
We study the response of the QCD vacuum to strong magnetic fields, using a potential model for the quark-antiquark interaction. We find that production of spin-polarized u-ubar pairs is energetically...
de Sitter entropy from conformal field theory (2002)
Kabat, Daniel, Lifschytz, Gilad
We propose that the entropy of de Sitter space can be identified with the mutual entropy of a dual conformal field theory. We argue that unitary time evolution in de Sitter space restricts the total...
Probing black holes in non-perturbative gauge theory (2001)
Iizuka, Norihiro, Kabat, Daniel, Lifschytz, Gilad, Lowe, David A.
We use a 0-brane to probe a ten-dimensional near-extremal black hole with N units of 0-brane charge. We work directly in the dual strongly-coupled quantum mechanics, using mean-field methods to...
Black hole entropy from non-perturbative gauge theory (2001)
Kabat, Daniel, Lifschytz, Gilad, Lowe, David A.
We present the details of a mean-field approximation scheme for the quantum mechanics of N D0-branes at finite temperature. The approximation can be applied at strong 't Hooft coupling. We find that...
Testing cosmological supersymmetry breaking (2001)
Kabat, Daniel, Rajaraman, Arvind
Banks has proposed a relation between the scale of supersymmetry breaking and the cosmological constant in de Sitter space. His proposal has a natural extension to a general FRW cosmology, in which...
Black Hole Thermodynamics from Calculations in Strongly-Coupled Gauge Theory (2000)
Kabat, Daniel, Lifschytz, Gilad, Lowe, David A.
We develop an approximation scheme for the quantum mechanics of N D0-branes at finite temperature in the 't Hooft large-N limit. The entropy of the quantum mechanics calculated using this...
Black Hole Thermodynamics from Calculations in Strongly-Coupled Gauge Theory (2000)
The Erwin, Schrodinger International Boltzmanngasse, Gilad Lifschytz, Daniel Kabat, Daniel Kabat, ...
this report we describe a set of approximations that can be applied to the quantum mechanics in the regime of interest. Using these techniques we calculate the nite temperature partition function of...
Approximations for strongly-coupled supersymmetric quantum mechanics (1999)
Kabat, Daniel, Lifschytz, Gilad
We advocate a set of approximations for studying the finite temperature behavior of strongly-coupled theories in 0+1 dimensions. The approximation consists of expanding about a Gaussian action, with...
Gauge theory origins of supergravity causal structure (1999)
Kabat, Daniel, Lifschytz, Gilad
We discuss the gauge theory mechanisms which are responsible for the causal structure of the dual supergravity. For D-brane probes we show that the light cone structure and Killing horizons of...
Tachyons and Black Hole Horizons in Gauge Theory (1998)
Kabat, Daniel, Lifschytz, Gilad
Any probe which crosses the horizon of a black hole should be absorbed. In M(atrix) theory, for 0-brane probes of Schwarzschild black holes, we argue that the relevant absorption mechanism is a...
Spherical membranes in Matrix theory (1997)
Kabat, Daniel, Taylor, Washington
We consider membranes of spherical topology in uncompactified Matrix theory. In general for large membranes Matrix theory reproduces the classical membrane dynamics up to 1/N corrections; for certain...
Wilson Lines and T-Duality in Heterotic M(atrix) Theory (1997)
We study the M(atrix) theory which describes the $E_8 \times E_8$ heterotic string compactified on $S^1$, or equivalently M-theory compactified on an orbifold $(S^1/\integer_2) \times S^1$, in the...
D-branes and Short Distances in String Theory (1996)
Douglas, Michael R., Kabat, Daniel, Pouliot, Philippe, Shenker, Stephen H.
We study the behavior of D-branes at distances far shorter than the string length scale~$l_s$. We argue that short-distance phenomena are described by the IR behavior of the D-brane world-volume...
A Comment on Zero-brane Quantum Mechanics (1996)
Kabat, Daniel, Pouliot, Philippe
We consider low energy, non-relativistic scattering of two Dirichlet zero-branes as an exercise in quantum mechanics. For weak string coupling and sufficiently small velocity, the dynamics is...
Black Hole Entropy and Entropy of Entanglement (1995)
We compare the one-loop corrections to the entropy of a black hole, from quantum fields of spin zero, one-half, and one, to the entropy of entanglement of the fields. For fields of spin zero and...
We investigate the canonical quantization of gravity coupled to pointlike matter in 2+1 dimensions. Starting from the usual point particle action in the first order formalism, we introduce auxiliary...
Validity of the Eikonal Approximation (1992)
We summarize results on the reliability of the eikonal approximation in obtaining the high energy behavior of a two particle forward scattering amplitude. Reliability depends on the spin of the...