Electromagnetic perturbations in new brane world scenarios

We study scalar and electromagnetic perturbations of a family of nonsingular nonrotating black hole spacetimes that are solutions in a large class of conformally invariant theories of gravity. The effective potential for scalar perturbations depends on the exact form of the scaling factor. Electromagnetic perturbations do not feel the scaling factor, and the corresponding quasinormal mode spectrum is the same as in the Schwarzschild metric. We find that these black hole metrics are stable under scalar and electromagnetic perturbations. Assuming that the quasinormal mode spectrum for scalar perturbations is not too different from that for gravitational perturbations, we can expect that the calculation of the quasinormal mode spectrum and the observation with gravitational wave detectors of quasinormal modes from astrophysical black holes can constrain the scaling factor and test these solutions.

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“…In spherically symmetric backgrounds, the electromagnetic potential A µ can be expanded in 4-dimensional vector spherical harmonics as [17,18] A…”

Section: Electromagnetic Perturbationsmentioning

confidence: 99%

Scalar perturbations of nonsingular nonrotating black holes in conformal gravity

et al. 2017

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“…The B and D decays into two mesons have been thoroughly studied theoretically with different approaches, pQCD, QCDF, SCET, BBNS factorization, light front models, and much progress has been done on the topic [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. One common thing to these approaches is that different structures appearing in different reactions are identified and conveniently parameterized in terms of parameters (the most popular the Wilson coefficients) that are finally obtained from experimental data.…”

Section: Introductionmentioning

confidence: 99%

Pseudoscalar or vector meson production in non-leptonic decays of heavy hadrons

Oset

2018

Eur. Phys. J. C

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We have addressed the study of non-leptonic weak decays of heavy hadrons ( b , c , B and D), with external and internal emission to give two final hadrons, taking into account the spin-angular momentum structure of the mesons and baryons produced. A detailed angular momentum formulation is developed which leads to easy final formulas. By means of them we have made predictions for a large amount of reactions, up to a global factor, common to many of them, that we take from some particular data. Comparing the theoretical predictions with the experimental data, the agreement found is quite good in general and the discrepancies should give valuable information on intrinsic form factors, independent of the spin structure studied here. The formulas obtained are also useful in order to evaluate meson-meson or meson-baryon loops, for instance of B decays, in which one has PP, PV, VP or VV intermediate states, with P for pseudoscalar mesons and V for vector meson and lay the grounds for studies of decays into three final particles.

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“…Recently we have extended the investigation of black holes in brane-world models to their wave differential scattering cross sections, more specifically considering massless scalar plane waves impinging upon small static neutral and electrically charged black holes in the Arkani-Hamed-Dimopoulos-Dvali model [29,30]. Other authors have previously considered some scattering properties of black holes on brane-world models, as the absorption cross section [16,31,32], shadows [33][34][35][36] and deflections [35,37] and also quasinormal modes [32,[38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Scalar scattering from black holes with tidal charge

Oliveira

2018

Eur. Phys. J. C

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The cross sections of black holes with tidal charge predicted in the context of the Randall-Sundrum brane-world scenario are computed considering the massless scalar field. Results obtained for black holes with different tidal-charge intensities are compared in order to study how this charge modifies the black hole cross sections. Such results are also compared with the ones for Schwarzschild and extreme Reissner-Nordström black holes. The increase of the tidalcharge intensity makes the black hole absorb more and can also be measured by the narrowing of interference fringes of the differential scattering cross section. These results indicate that the effects of the tidal charge are very important in phenomena which take place near the black hole, but can be neglected in the far region. Analytical results are obtained in the high-frequency limit and are shown to excellently agree with the numeric results obtained via the partial-wave method. It is shown numerically that black holes with tidal charge obey the universality of the low-frequency absorption cross section of stationary black holes for the massless scalar field. * ednilton@pq.cnpq.br 1 See refs. [6-10] for some of the most recent constraints on quantum black hole production at the LHC.

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Electromagnetic perturbations in new brane world scenarios

Cited by 21 publications

References 51 publications

Scalar perturbations of nonsingular nonrotating black holes in conformal gravity

Scalar perturbations of nonsingular nonrotating black holes in conformal gravity

Pseudoscalar or vector meson production in non-leptonic decays of heavy hadrons

Scalar scattering from black holes with tidal charge

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