Article

# Scattering of gravitational radiation by a Schwarzschild black-hole.

Department of Physics, New York University, New York, NY 10012, USA.

Nature (Impact Factor: 42.35). 09/1970; 227(5261):936-8. DOI: 10.1038/227936a0 Source: PubMed

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**ABSTRACT:**We evaluate the massless scalar field quasi-normal frequencies of Schwarzschild black hole in the quintessence background, using the third-order WKB approximation method. Results show that quintessence decreases the oscillation frequency while increases the damping time of the scalar field. Moreover, with the increase of the quintessential state parameter ω q (the ratio of the pressure to the energy density), the imaginary parts’ absolute values of the quasi-normal frequencies increase monotonously. This indicates that the scalar field decays more rapidly in the larger ω q quintessence state, which agrees with the cases of other perturbation fields for black holes in the quintessence background. For the special case of SdS black hole ( ω q =‑1), the oscillation frequency and the damping rate increase with the decrease of the normalization factor c (corresponding to the cosmological constant Λ in SdS black hole).European Physical Journal C 09/2013; · 5.44 Impact Factor -
##### Article: VALIDITY OF EMPARAN–HOROWITZ-MYERS ARGUMENT IN HAWKING RADIATION INTO MASSLESS SPIN-2 FIELDS

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**ABSTRACT:**The Hawking radiation for massless spin-2 fields is numerically studied when the spacetime background is (4+n)-dimensional Schwarzschild black hole phase. In order to check the validity of the Emparan–Horowitz–Myers argument, black holes radiate mainly on the brane, we assume that the radial equation for the massless spin-2 fields propagating on the brane obeys the master equation approximately. The transmission coefficient is computed explicitly by making use of the Hawking–Hartle theorem. It is shown that the total emission rates into the bulk are dominant compared to the rates on the visible brane when n ≥ 3. However, the bulk-to-brane relative emissivities per degree of freedom always remain O(1) roughly. The experimental significance of these results in the production of mini-black holes in future colliders is briefly discussed.Modern Physics Letters A 11/2011; 22(22). · 1.34 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**We investigated quasinormal frequencies (QNFs) in black brane with hyperscaling violating by using the continued fractions method. We calculate QNF of massless scalar field and electromagnetic field both with zero spatial momentum, find that QNFs have negative imaginary frequency suggesting black brane with hyperscaling violation is stable under those perturbations.Modern Physics Letters A 12/2013; 28(37):50145-. · 1.34 Impact Factor

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