New counterterms induced by trans-Planckian physics in semiclassical gravity

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dc.creatorNacir, Diana López
dc.creatorMazzitelli, Francisco D.
dc.date2007-11-28
dc.date.accessioned2026-07-07T11:54:26Z
dc.date.available2026-07-07T11:54:26Z
dc.descriptionWe consider free and self-interacting quantum scalar fields satisfying modified dispersion relations in the framework of Einstein-Aether theory. Using adiabatic regularization, we study the renormalization of the equation for the mean value of the field in the self-interacting case, and the renormalization of the semiclassical Einstein-Aether equations for free fields. In both cases we consider Bianchi type I background spacetimes. Contrary to what happens for {\it free} fields in {\it flat} Robertson-Walker spacetimes, the self-interaction and/or the anisotropy produce non-purely geometric terms in the adiabatic expansion, i.e terms that involve both the metric $g_{μν}$ and the aether field $u_μ$. We argue that, in a general spacetime, the renormalization of the theory would involve new counterterms constructed with $g_{μν}$ and $u_μ$, generating a fine-tuning problem for the Einstein-Aether theory.
dc.identifierhttps://arxiv.org/abs/0711.4554
dc.identifierhttp://arxiv.org/abs/0711.4554
dc.identifierPhys.Rev.D78:044001,2008
dc.identifierdoi:10.1103/PhysRevD.78.044001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/204898
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleNew counterterms induced by trans-Planckian physics in semiclassical gravity
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