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Title: Propagation in a thermal graviton background
Author: Arteaga Barriel, Daniel
Parentani, Renaud
Verdaguer Oms, Enric, 1950-
Keywords: Gravetat quàntica
Teoria quàntica de camps
Espai i temps
Partícules (Física nuclear)
Quantum gravity
Quantum field theory
Space and time
Particles (Nuclear physics)
Issue Date: 2004
Publisher: The American Physical Society
Abstract: It is well known that radiative corrections evaluated in nontrivial backgrounds lead to effective dispersion relations which are not Lorentz invariant. Since gravitational interactions increase with energy, gravity-induced radiative corrections could be relevant for the trans-Planckian problem. As a first step to explore this possibility, we compute the one-loop radiative corrections to the self-energy of a scalar particle propagating in a thermal bath of gravitons in Minkowski spacetime. We obtain terms which originate from the thermal bath and which indeed break the Lorentz invariance that possessed the propagator in the vacuum. Rather unexpectedly, however, the terms which break Lorentz invariance vanish in the high three-momentum limit. We also found that the imaginary part, which gives the rate of approach to thermal equilibrium, vanishes at one loop.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review D, 2004, vol. 70, núm. 4, p. 044019-1-044019-15
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ISSN: 0556-2821
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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