Superluminal dispersion relations and the Unruh effect

Details Superluminal dispersion relations and the Unruh effect Superluminal dispersion relations and the Unruh effect

2008-02-05

arxiv.org/abs/0802.0618v3

Phys.Rev.D77:124029,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Final discussion expanded, references added. Version accepted for publication in Phys Rev D

Scientific paper

10.1103/PhysRevD.77.124029

In the context of quantum gravity phenomenology, we study the Unruh effect in the presence of superluminal dispersion relations. In particular, we estimate the response function and the probability rate for an accelerated detector coupled to a massless scalar field, whose dispersion relation becomes essentially quadratic beyond a threshold momentum $k_p$. By means of perturbative analysis, we show that superluminal dispersion induces a correction to the Planckian spectrum, which tends to vanish as $k_p$ increases.

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