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It has been 30 years since the discovery of the Unruh effect. It has played a crucial role in our understanding that the particle content of a field theory is observer dependent. This effect is important in its own right and as a way to understand the phenomenon of particle emission from black holes and cosmological horizons. The Unruh effect is reviewedâ€¦ (More)

Using the Unruh-DeWitt detector, it is shown that a universal and continuous Lorentz transformation of temperature cannot exist for black-body radiation. Since any valid Lorentz transformation of temperature must be able to deal with black-body radiation, it is concluded that a universal and continuous temperature transformation does not exist. âˆ—Permanentâ€¦ (More)

We investigate whether inertial thermometers moving in a thermal bath behave as being hotter or colder. This question is directly related to the classical controversy concerning how temperature transforms under Lorentz transformations. Rather than basing our arguments on thermodynamical hypotheses, we perform straightforward calculations in the context ofâ€¦ (More)

We investigate the decay of accelerated protons and neutrons. Calculations are carried out in the inertial and coaccelerated frames. Particle interpretation of these processes are quite different in each frame but the decay rates are verified to agree in both cases. For the sake of simplicity our calculations are performed in a two-dimensional spacetimeâ€¦ (More)

- LuÃs C. B. Crispino, Atsushi Higuchi, George E. A. Matsas
- Physical review letters
- 2012

- Douglas Fregolente, George E. A. Matsas, Daniel A. T. Vanzella
- 2006

We investigate the possible decay of protons in geodesic circular motion around neutral compact objects. Weak and strong decay rates and the associated emitted powers are calculated using a semi-classical approach. Our results are discussed with respect to distinct ones in the literature, which consider the decay of accelerated protons in electromagneticâ€¦ (More)

We discuss the influence of the background thermal bath on the depolarization of electrons in high-energy storage rings, and on the photon emission associated with the spin flip. We focus, in particular, on electrons at CERN LEP. We show that in a certain interval of solid angles the photon emission is enhanced several orders of magnitude because of theâ€¦ (More)

We quantize the low-energy sector of a massless scalar field in Reissner-NordstrÃ¶m spacetime. This allows the analysis of processes involving soft scalar particles occurring outside charged black holes. In particular, we compute the response of a static scalar source interacting with Hawking radiation using the Unruh ~and the Hartle-Hawking! vacuum. Thisâ€¦ (More)

In 1970 Geroch [1] raised the possibility of violating the ordinary second law of thermodynamics with help of classical black holes. The idea was to bring slowly from infinity a box with proper energy Eb over the event horizon and throw it eventually inside the hole. The cycle would be closed by lifting back the ideal rope, which is assumed to haveâ€¦ (More)

We investigate whether inertial thermometers moving in a thermal bath behave as being hotter or colder. This question is directly related to the classical controversy concerning how temperature transforms under Lorentz transformations. Rather than basing our arguments on thermodynamical hypotheses, we perform straightforward calculations in the context ofâ€¦ (More)