Black Hole Astrophysics in AdS Braneworlds

Abstract

We consider astrophysics of large black holes localized on the brane in the infinite RandallSundrum model. Using their description in terms of a conformal field theory (CFT) coupled to gravity, deduced in Ref.[1], we show that they undergo a period of rapid decay via Hawking radiation of CFT modes. For example, a black hole of mass few × M ⊙ would shed most of its mass in ∼ 10 4 − 10 5 years if the AdS radius is L ∼ 10 −1 mm, currently the upper bound from table-top experiments. Since this is within the mass range of X-ray binary systems containing a black hole, the evaporation enhanced by the hidden sector CFT modes could cause the disappearance of X-ray sources on the sky. This would be a striking signature of RS2 with a large AdS radius. Alternatively, for shorter AdS radii, the evaporation would be slower. In such cases, the persistence of X-ray binaries with black holes already implies an upper bound on the AdS radius of L < ∼ 10 −2 mm, an order of magnitude better than the bounds from table-top experiments. The observation of primordial black holes with a mass in the MACHO range M ∼ 0.1 − 0.5 M ⊙ and an age comparable to the age of the universe would further strengthen the bound on the AdS radius to L < ∼ few × 10 −6 mm. 1 roberto.emparan@cern.ch 2

Non-relativistic limit of Randall-Sundrum model: solutions, applications and constraints

“…Figure 2 shows that for such values of l the difference between the approximate and exact formulas is negligible. It is worth noting that close constraints were found in the table-top inverse square law experiments [13] and from astrophysical observations [14]- [18].…”

Extra dimensions at the CERN LHC via mini-black holes: Effective Kerr-Newman brane-world effects

“…. .,'' so that ' & 0:1 mm [30,44] provides a more accurate magnitude limit improvement on the bulk curvature '. The Weyl ''electric'' term E carries an imprint of high-energy effects sourcing Kaluza-Klein (KK) modes.…”

Measurements of Black Hole Spins and Tests of Strong-Field General Relativity

“…Fig. 7 illustrates an example of constraining the size of a large extra dimension using the properties of the black hole in XTE J1118+480 (following Emparan et al 2002). In theories with one large extra dimension, black holes evaporate significantly faster compared to what is predicted by general relativity.…”