Modified Dispersion Relations and the Unruh Effect

por Massimiliano Rinaldi (Universita' di Bologna)

lunes 21 jul. 2008 15:00 → 16:00 Europe/Madrid

Sala Seminarios (Dpto. de Física Teórica (UVEG))

It is well known that an ideal detector moving on an accelerated trajectory in Minkowski space registers an exactly thermal bath of radiation. This result relies upon (among other things) the linear dispersion displayed by a relativistic scalar field. However, there are reasons to believe that local Lorentz invariance does not hold above a certain energy scale, when perturbative effects of a yet unknown quantum gravity are no longer negligible. We therefore consider the Unruh effect in the presence of Lorentz-breaking, non-linear dispersion relations, and we show that the corrections to the thermal spectrum are exponentially suppressed, in line with the robustness of Hawking radiation.