Cosmological Evolution with Brane-bulk Energy Exchange

Abstract

Abstract:The consequences for the brane cosmological evolution of energy exchange between the brane and the bulk are analyzed in detail, in the context of a non-factorizable background geometry with vanishing effective cosmological constant on the brane. A rich variety of brane cosmologies is obtained, depending on the precise mechanism of energy transfer, the equation of state of brane-matter and the spatial topology. An accelerating era is generically a feature of our solutions. In the case of low-density flat universe more dark matter than in the conventional FRW picture is predicted. Spatially compact solutions are found to delay their re-collapse.

Holography and brane–bulk energy exchange

“…Further analysis confirmed these expectations [28] and showed also new solutions indicating tracking behavior between brane and bulk energy density [4]. Several more works [29]- [33] analyzed new cases, or provided some exact solutions [34,35].…”

D‐branes in Standard Model building, gravity and cosmology

“…This is possible if we assume that the diagonal elements of the various contributions to the energy-momentum tensor satisfy the schematic inequality [56]- [59] T…”

“…Such a picture , allows for novel cosmological mechanisms, namely inflow or outflow of matter from the bulk space [172], [56]- [59], that can trigger undesirable (constraining) effects [279], but can also provide natural mechanisms for inflation or late-time acceleration [56]- [59].…”

“…In order to derive solutions that are largely independent of the bulk dynamics, the T 5 term on the right hand side of the same equation must be negligible relative to the second one. This is possible if we assume that the diagonal elements of the various contributions to the energy-momentum tensor satisfy the schematic inequality [56]- [59] T…”

“…(iv) The cosmological evolution on our brane world is driven by matter localized on the brane and also bulk fields ("mirage cosmology" [41]). Such a picture , allows for novel cosmological mechanisms, namely inflow or outflow of matter from the bulk space [172], [56]- [59], that can trigger undesirable (constraining) effects [279], but can also provide natural mechanisms for inflation or late-time acceleration [56]- [59].…”