177 research outputs found
Alternative Derivation of the Correspondence Between Rindler and Minkowski Particles
We develop an alternative derivation of Unruh and Wald's seminal result that
the absorption of a Rindler particle by a detector as described by uniformly
accelerated observers corresponds to the emission of a Minkowski particle as
described by inertial observers. Actually, we present it in an inverted
version, namely, that the emission of a Minkowski particle corresponds in
general to either the emission or the absorption of a Rindler particle.Comment: 7 pages, no-figures, REVTE
Elementary particles under the lens of the black holes
After a brief review of the historical development and CLASSICAL properties
of the BLACK HOLES, we discuss how our present knowledge of some of their
QUANTUM properties shed light on the very concept of ELEMENTARY PARTICLE. As an
illustration, we discuss in this context the decay of accelerated protons,
which may be also relevant to astrophysics.Comment: 6 pages, Proceedings of the XXIII Brazilian National Meeting on
Particles Physics and Fields. To appear in special issue of the Brazilian
Journal of Physic
Do static sources outside a Schwarzschild black hole radiate?
We show that static sources coupled to a massless scalar field in
Schwarzschild spacetime give rise to emission and absorption of zero-energy
particles due to the presence of Hawking radiation. This is in complete analogy
with the description of the bremsstrahlung by a uniformly accelerated charge
from the coaccelerated observers' point of view. The response rate of the
source is found to coincide with that in Minkowski spacetime as a function of
its proper acceleration. This result may be viewed as restoration of the
equivalence principle by the Hawking effect.Comment: 13 page
Interaction of Hawking radiation and a static electric charge
We investigate whether the equality found for the response of static scalar
sources interacting (i) with {\em Hawking radiation in Schwarzschild spacetime}
and (ii) with the Fulling-Davies-Unruh thermal bath in the Rindler wedge is
maintained in the case of electric charges. We find a finite result in the
Schwarzschild case, which is computed exactly, in contrast with the divergent
result associated with the infrared catastrophe in the Rindler case, i.e. in
the case of uniformly accelerated charges in Minkowski spacetime. Thus, the
equality found for scalar sources does not hold for electric charges.Comment: 8 pages (REVTEX
Fermion Helicity Flip in Weak Gravitational Fields
The helicity flip of a spin- Dirac particle
interacting gravitationally with a scalar field is analyzed in the context of
linearized quantum gravity. It is shown that massive fermions may have their
helicity flipped by gravity, in opposition to massless fermions which preserve
their helicity.Comment: RevTeX 3.0, 8 pages, 3 figures (available upon request), Preprint
IFT-P.013/9
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