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42 papers · 1 filter
Noncommutative Geometry and D-Branes
Pei-Ming Ho, Yong-Shi Wu
We apply noncommutative geometry to a system of N parallel D-branes, which is interpreted as a quantum space. The Dirac operator defining the quantum differential calculus is ident…
Modeling the decoherence of spacetime
John T. Whelan
The question of whether unobserved short-wavelength modes of the gravitational field can induce decoherence in the long-wavelength modes (``the decoherence of spacetime'') is addre…
Giant persistent current in free-electron model with flat Fermi surface
E. V. Tsiper, A. L. Efros
For the first time the persistent current in a 2D free-electron system has been calculated analytically. The tight binding model is considered on a square lattice with filling fact…
Which Chiral Symmetry is Restored in High Temperature QCD?
Claude Bernard, Tom Blum, Carleton DeTar +7
Sigma models for the high temperature phase transition in quantum chromodynamics (QCD) suggest that at high temperature the SU(N_f) x SU(N_f) chiral symmetry becomes exact, but the…
Head-on collision of unequal mass black holes: close-limit predictions
Zeferino Andrade, Richard Price
The close-limit method has given approximations in excellent agreement with those of numerical relativity for collisions of equal mass black holes. We consider here colliding holes…
An exact self-consistent gravitational shock wave in semiclassical gravity
Carlos O. Lousto, Francisco D. Mazzitelli
We find a self-consistent pp-gravitational shock wave solution to the semiclassical Einstein equations resulting from the approach to the effective action. We model the renor…