113 research outputs found
Charged Unruh effect on geon spacetimes
A topological geon black hole with gauge charges may have a gauge bundle that
necessarily incorporates charge conjugation as a gauge symmetry. This happens
for example for the Reissner-Nordstrom geon. We show that gauging the charge
conjugation leaves an imprint in the Unruh effect: the geon's exterior region
contains non-thermal correlations for particle pairs of the same, rather than
opposite, charge. The phenomenon occurs also in topologically similar Rindler
spacetimes with a background gauge field.Comment: 3 pages, talk given by David E. Bruschi at the 12th Marcel Grossmann
Meetin
Thermodynamics of relativistic quantum fields confined in cavities
We investigate the quantum thermodynamical properties of localised
relativistic quantum fields, and how they can be used as quantum thermal
machines. We study the efficiency and power of energy transfer between the
classical gravitational degrees of freedom, such as the energy input due to the
motion of boundaries or an impinging gravitational wave, and the excitations of
a confined quantum field. We find that the efficiency of energy transfer
depends dramatically on the input initial state of the system. Furthermore, we
investigate the ability of the system to extract energy from a gravitational
wave and store it in a battery. This process is inefficient in optical cavities
but is significantly enhanced when employing trapped Bose Einstein condensates.
We also employ standard fluctuation results to obtain the work probability
distribution, which allows us to understand how the efficiency is related to
the dissipation of work. Finally, we apply our techniques to a setup where an
impinging gravitational wave excites the phononic modes of a Bose Einstein
condensate. We find that, in this case, the percentage of energy transferred to
the phonons approaches unity after a suitable amount of time. These results
give a quantitative insight into the thermodynamic behaviour of relativistic
quantum fields confined in cavities.Comment: 35 pages, 3 figures. Manuscript substantially updated. I. Fuentes
also published as I. Fuentes-Guridi and I. Fuentes-Schulle
Entanglement generation in relativistic cavity motion
We analyse particle creation and mode mixing for a quantum field in an
accelerated cavity, assuming small accelerations but allowing arbitrary
velocities, travel times and travel distances, and in particular including the
regime of relativistic velocities. As an application, we identify a desktop
experimental scenario where the mode mixing resonance frequency in linear
sinusoidal motion or in uniform circular motion is significantly below the
particle creation resonance frequencies of the Dynamical Casimir Effect, and
arguably at the threshold of current technology. The mode mixing acts as a
beamsplitter quantum gate, experimentally detectable not only via fluxes or
particle numbers but also via entanglement generation.Comment: 8 pages, LaTeX with jpconf. Submitted to DICE2012 proceeding
Gravity-induced electric currents
We study the generation of an electric current in an ideal conducting coil,
immersed in a magnetic field, due to the occurrence of a gravitational
perturbation. We show that this effect can be used to detect gravitational
waves impinging on the coil as well as gravitational gradients when the coil
moves in a static background gravitational field. Our work opens the way to
employing induced electric signals to detect dynamical gravitational fields and
for gradiometry.Comment: 11 pages, 4 figure
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