It has been $30\phantom{\rule{0.3em}{0ex}}\text{years}$ since the discovery of Unruh effect. played a crucial role in our understanding that particle content field theory is observer dependent. This effect important its own right and as way to understand phenomenon emission from black holes cosmological horizons. The reviewed here with particular emphasis on applications. A number recent developments are also commented some controversies discussed. Effort made clarify what seem be common...

We use the Unruh effect to investigate how teleportation of quantum states is affected when one entangled qubits used in process under influence some external force. In order reach a comprehensive understanding, detailed analysis acceleration on such qubit system performed. particular, we calculate mutual information and concurrence between two show that latter has ``sudden death'' at finite acceleration, whose value will depend time interval along which detector accelerated.

We investigate the weak decay of uniformly {\em accelerated protons} in context standard} Quantum Field Theory. Because mean proper} lifetime a particle is scalar, same value for this observable must be obtained inertial and coaccelerated frames. are only able to achieve equality by considering Fulling-Davies-Unruh effect. This reflects fact that effect mandatory consistency There no question about its existence provided one accepts validity standard Theory flat spacetime.

We examine a nearly extreme macroscopic Reissner-Nördstrom black hole in the context of semiclassical gravity. The absorption rate associated with quantum tunneling process scalar particles whereby this can acquire enough angular momentum to violate weak cosmic-censorship conjecture is shown be nonzero.

We use the Unruh effect to analyze dynamics of classical and quantum correlations for a two-qubit system when one them is uniformly accelerated finite amount proper time. show that correlation completely destroyed in limit infinite acceleration, while remains nonzero. In particular, we such exhibit so-called sudden-change behavior as function acceleration. Eventually, discuss how our results can be interpreted lies vicinity event horizon Schwarzschild black hole.

Although the Unruh effect can be rigorously considered as well tested free quantum field theory itself, it would nice to provide experimental evidence of its existence. This is not easy because linear acceleration needed reach a temperature 1 K order ${10}^{20}\text{ }\text{ }\mathrm{m}/{\mathrm{s}}^{2}$. Here, we propose simple experiment reachable under present technology whose result may directly interpreted in terms thermal bath. Instead waiting for experimentalists perform it, use...

We discuss the emission of radiation from general sources in quantum scalar, electromagnetic and gravitational fields using Rindler coordinate frame, which is suitable for a uniformly accelerated observer, Minkowski vacuum. In particular, we point out that, to recover usual Larmor interaction picture, it necessary incorporate Unruh effect. Thus, observation classical could be seen as vindicating effect sense that not correctly reproduced this context unless taken into account.

Abstract We discuss the information loss issue for completely evaporating black holes in context of a globally hyperbolic spacetime that maintains unchanged entire semiclassical picture except “last evaporation breath,” which pertains to full quantum gravity. Even though observers outside hole cannot access enters horizon, there is no actual imposed by causal structure since it carried over from one Cauchy surface next (provided local evolution unitary).

The bremsstrahlung effect associated with a point charge constant proper acceleration is discussed from the of view frame coaccelerating charge. In this immersed in so-called Fulling-Davies-Unruh thermal bath. It shown that emission photon source as described by inertial observer can be interpreted accelerated either or absorption zero-energy Rindler explicit calculations rate photons fixed transverse momentum agrees combined and same frame. A discussion on issue detectability these...

We analyze the problem of neutrino oscillations via a fermionic particle detector model inspired by physics Fermi theory weak interactions. The naturally leads to description emission and absorption neutrinos in terms localized two-level systems. By explicitly including source as part dynamics, formalism is shown recover standard results for without mention ``flavor states,'' which are ill defined quantum field theory. This illustrates how models provide powerful theoretical tool approach...

We discuss the Gupta-Bleuler quantization of free electromagnetic field outside static black holes in Boulware vacuum. use a gauge which reduces to Feynman Minkowski spacetime. also its relation with gauges used previously. Then we apply low-energy sector this theory investigate some phenomena. First, response rate charge Schwarzschild hole four dimensions. Next, motivated by string physics, compute absorption cross sections plane waves for and extreme Reissner-Nordstr\"om arbitrary...

The bremsstrahlung effect is analyzed in the frame coaccelerating with charge. In particular, it shown that usual rate of photon emission a given transverse momentum computed inertial can be interpreted as combined (adsorption) zero-energy Rindler photons into (from) thermal bath calculated particle rest frame.

We revisit the mechanism for violating weak cosmic-censorship conjecture (WCCC) by overspinning a nearly-extreme charged black hole. The consists of an incoming massless neutral scalar particle, with low energy and large angular momentum, tunneling into investigate effect momentum particle on background geometry address recent claims that such backreaction would invalidate mechanism. show incident does not constitute obvious impediment to success quantum mechanism, although induced turns out...

Void of any inherent structure in classical physics, the vacuum has revealed to be incredibly crowded with all sorts processes relativistic quantum physics. Yet, its direct effects are usually so subtle that remains almost as evasive Here, contrast, we report on discovery a novel effect according which is compelled play an unexpected central role astrophysical context. We show formation stars may lead energy density field exponential growth. The vacuum-driven evolution would then follow...

Recently, the inverse $\ensuremath{\beta}$-decay rate calculated with respect to uniformly accelerated observers (experiencing Unruh thermal bath) was revisited. Concerns have been raised regarding compatibility of inertial and observers' results when neutrino mixing is taken into account. Here, we show that these concerns are unfounded by discussing properties bath neutrinos explicitly calculating decay rates according both sets observers, confirming thus they in agreement. The effect...

The behavior of uniformly accelerated detectors in the Minkowski and Rindler vacua is analyzed when detector coupled to a scalar field during finite amount time $T$. We point out that logarithmic ultraviolet divergences reported literature are due instantaneous switching detector. explicitly show this by considering switched on off continuously. usual Planckian spectrum for excitation probability recovered limit $T\ensuremath{\rightarrow}+\ensuremath{\infty}$.

The absorption cross section of black holes has been investigated for various fields. Nevertheless, the Schwarzschild electromagnetic field only calculated in low- and high-frequency approximations until now. Here we compute it numerically arbitrary frequencies.

We investigate the decay of accelerated protons and neutrons. Calculations are carried out in inertial coaccelerated frames. Particle interpretation these processes quite different each frame but rates verified to agree both cases. For sake simplicity our calculations performed a two-dimensional spacetime since conclusions not conceptually affected by this.

We analyze the field radiation due to a general source in inertial and accelerated frames classical massless scalar theory Minkowski spacetime. The particle numbers these are defined further justified context of quantum mechanics. simple relation between two expressions shows how some aspects Fulling-Davies-Unruh thermal bath present theory. Finally we show our results an operator algebra can be used obtain expression for effect. also comment on expected analogue Schwarzschild black hole.

We compute numerically the absorption cross section of a canonical acoustic hole for sound waves with arbitrary frequencies. Our outputs are in full agreement expected low- and high-frequency limits.

We investigate the low-frequency absorption cross section of electromagnetic waves for extreme Reissner-Nordstrom black holes in higher dimensions. first construct exact solutions to relevant wave equations zero-frequency limit. In most cases it is possible use these find transmission coefficients partial calculate five and six spacetime that this dominated by modes with l=2 spherical-harmonic expansion rather than those l=1, as might have been expected, because mixing between gravitational...

The interplay between acceleration and radiation harbors remarkable surprising consequences. One of the most striking is that Larmor emitted by a charge can be seen as consequence Unruh thermal bath. Indeed, this connection effect classical bremsstrahlung was used recently to propose an experiment confirm (as directly possible) existence This situation may sound puzzling in two ways: first, because strictly quantum while one, second, crucial role played zero-frequency Rindler photons...