72 research outputs found
Acoustic Black Holes from Abelian Higgs Model with Lorentz Symmetry Breaking
In this paper we derive acoustic black hole metrics in the (3+1) and
(2+1)-dimensional Abelian Higgs model with Lorentz symmetry breaking. In this
set up the sound waves lose the Lorentz boost invariance and suffer a
'birefringence' effect. We have found acoustic black holes and respective
Hawking temperatures depending on the Lorentz violating parameter. Furthermore,
we obtain an acoustic Kerr-like black hole metric with the Lorentz violating
term affecting its rate of loss of mass. We also have shown that for suitable
values of the Lorentz violating parameter a wider spectrum of particle wave
function can be scattered with increased amplitude by the acoustic black hole.Comment: 12 pages, Latex, no figures, version accepted to Phys. Lett.
The ambiguity-free four-dimensional Lorentz-breaking Chern-Simons action
The four dimensional Lorentz-breaking finite and determined Chern-Simons like
action is generated as a one loop perturbative correction via an appropriate
Lorentz-breaking coupling of the gauge field with the spinor field. Unlike the
known schemes of calculations, within this scheme this term is found to be
regularization independent.Comment: Revtex4, 4 page
Lorentz-violating Chern-Simons action under high temperature in massless QED
Lorentz and CPT violating QED with massless fermions at finite temperature is
studied. We show that there is no ambiguity in the induced coefficient of the
Chern-Simons-like term that defines the so-called Carroll-Field-Jackiw model at
high temperature. We also show that this system constitutes an example where
the breaking of CPT and Lorentz symmetries is more severe at high temperature
than in the zero temperature case thus precluding any naive expectations of
Lorentz symmetry restoration.Comment: 6 pages, 1 figure, final version to appear in Phys. Lett.
Superresonance effect from a rotating acoustic black hole and Lorentz symmetry breaking
We investigate the possibility of the acoustic superresonance phenomenon
(analog to the superradiance in black hole physics), i.e., the amplification of
a sound wave by reflection from the ergoregion of a rotating acoustic black
hole with Lorentz symmetry breaking. For rotating black holes the effect of
superradiance corresponds to the situation where the incident waves has
reflection coefficient greater than one, and energy is extracted from them. For
an acoustic Kerr-like black hole its rate of loss of mass is affected by the
Lorentz symmetry breaking. We also have shown that for suitable values of the
Lorentz violating parameter a wider spectrum of particle wave function can be
scattered with increased amplitude by the acoustic black hole.Comment: 9 pages, version to appear in PL
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