Comparing decay rates for black holes and D-branes

Abstract

We compute the leading order (in coupling) rate of emission of low energy quanta from a slightly nonextremal system of 1 and 5 D-branes. We also compute the classical cross-section, and hence the Hawking emission rate, for low energy scalar quanta for the black hole geometry that corresponds to these branes (at sufficiently strong coupling). These rates are found to agree with each other.Comment: harvmac, 17 pages; minor typos and a reference correcte

Microscopic formulation of black holes in string theory

“…In terms of (C.28) the above identification (C.38) reads 2u ≡ 2u + 2πinτ (C. 39) Note that this identification is in addition to (C.29). The two identifications defines for us two independent cycles in the u-plane.…”

“…Both cases (a) and (b) are compared with the D1-D5 conformal field theory calculations in Section 8 where we find exact agreement with the results of Section 3. The agreement involves new first principles calculations in the D-brane conformal field theory which involve significant conceptual departures from the phenomenological approach adopted in the early calculations (see [38,39,40] for the original papers and [41] for a review). We mention the new points in detail in Section 8 (esp.…”

“…For the semiclassical absorption/emission [38,39,40], all we need is the equation for propagation of the fluctuation h ab (or φ) on the black hole metric g µν . We will denote the minimal scalar fluctuation generically by the symbol ϕ; since it couples only to the five-dimensional Einstein metric (3.4), the equation of motion is…”

Open cosmic strings in black hole space-times

“…Therefore, these strings can carry radiation from inside the horizon to the horizon and that radiation can escape out to infinity in the form of Hawking radiation. The thermal nature of the radiation can be related to the thermodynamics of the massless modes moving on the world-sheet (for instance as discussed in [20]). It is interesting to note that in this scenario we are not dealing with the full quantum gravitational effects.…”

Probing 4-dimensional non-supersymmetric black holes carrying D0- and D6-brane charges

“…In recent years spectacular progress has been made towards a microscopic derivation of black hole thermodynamics based on string theory models [1,2,3,4,5,6,7,8]. 1 Central to this development has been the existence of Dirichlet p-brane solitons (Dp-branes) of string theory, and a description of their dynamics in terms of open strings.…”