We give a general (metric independent) derivation of the relation Th = K 2π connecting the black hole temperature (Th) with the surface gravity (K), following the tunneling interpretation of Hawking radiation. This derivation is valid even beyond the semi classical regime i. e. when quantum effects are not negligible. The formalism is then applied to a spherically symmetric, stationary noncommu...

We show that spherical accretion onto astrophysical black holes can be considered as a natural example of analogue system. We provide, for the first time, an exact analytical scheme for calculating the analogue Hawking temperature and surface gravity for general relativistic accretion onto astrophysical black holes. Our calculation may bridge the gap between the theory of transonic astrophysica...

We studied the efficiency and effects of the multiple sensory cues of tiger moths on echolocating bats. We used the northern long-eared bat, Myotis septentrionalis, a purported moth specialist that takes surface-bound prey (gleaning) and airborne prey (aerial hawking), and the dogbane tiger moth, Cycnia tenera, an eared species unpalatable to bats that possesses conspicuous colouration and soun...

International migration is an important factor in social, cultural and political change in East Asian. The paper discusses both emigration and immigration countries, using the Philippines as an example for the former, and Japan and Malaysia for the latter. It is argued that population mobility is an important element of the cross-border flows and transnational networks that constitute globaliza...

We investigate whether or not the Hawking-Page phase transition is possible to occur in three dimensions. Starting with the simplest class of LanczosLovelock action, thermodynamic behavior of all AdS-type black holes without charge falls into two classes: Schwarzschild-AdS black holes in even dimensions and Chern-Simons black holes in odd dimensions. The former class can provide the Hawking-Pag...

The brick-wall model seeks to explain the Bekenstein-Hawking entropy as a wall-contribution to the thermal energy of ambient quantum fields raised to the Hawking temperature. Reservations have been expressed concerning the self-consistency of this model. For example, it predicts large thermal energy densities near the wall, producing a substantial mass-correction and, presumably, a large gravit...

A bstract We discuss modifications to the Hawking spectrum that arise when asymptotic states are supertranslated or superrotated. For supertranslations we find nontrivial off-diagonal phases in two-point correlator although emission is eventually left unchanged, as previously pointed out literature. In contrast, superrotations give rise which manifest themselves and depend nontrivially on assoc...