Potentials between D-branes in a supersymmetric model of space-time foam

被引：61

作者：

Ellis, J ^{[1
]}

Mavromatos, NE

Westmuckett, M

机构：

[1] CERN, Dept Phys, TH Div, CH-1211 Geneva, Switzerland

[2] Kings Coll London, Dept Phys, London WC2R 2LS, England

来源：

PHYSICAL REVIEW D | 2005年 / 71卷 / 10期

关键词：

D O I：

10.1103/PhysRevD.71.106006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study a supersymmetric model of space-time foam with two stacks each of eight D8-branes with equal string tensions, separated by a single bulk dimension containing D0-brane particles that represent quantum fluctuations. The ground-state configuration with static D-branes has zero vacuum energy, but, when they move, the interactions among the D-branes and D-particles due to the exchanges of strings result in a nontrivial, positive vacuum energy. We calculate its explicit form in the limits of small velocities and large or small separations between the D-branes and/or the D-particles. This nontrivial vacuum energy appears as a central-charge deficit in the noncritical stringy sigma model describing perturbative string excitations on a moving D-brane. These calculations enable us to characterize the ground state of the D-brane/D-particle system, and provide a framework for discussing brany inflation and the possibility of residual dark energy in the present-day Universe.

引用

页数：13

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