The cosmological constant in the brane world of string theory on $S^1/Z_2$

Abstract

Orbifold branes in string theory are investigated, and the general field equations on the branes are given explicitly for type II and heterotic string. It is shown that the effective cosmological constant on each of the two branes can be easily lowered to its current observational value, using large extra dimensions. This is also true for type I string. The radion stability is studied by using the Goldberger-Wise mechanism, and shown explicitly that it is stable. Therefore, brane world of string theory provides a viable and built-in mechanism for solving the long-standing cosmological constant problem. Applying the formulas to cosmology, we obtain the generalized Friedmann equations on each of the two branes.

Add two new figures, and some typos are corrected. Version to appear in Physics Letters B

References in corpus (5)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Tests of the Gravitational Inverse-Square Law below the Dark-Energy Length Scale
• Thermodynamics of Apparent Horizon in Brane World Scenario
• The Return of a Static Universe and the End of Cosmology
• Cosmological constant and late transient acceleration of the universe in the Horava-Witten Heterotic M-Theory on S^{1}/Z_{2}

Cited by in corpus (5)

• Growth factor parametrization in curved space
• Finite Temperature Casimir Effect in Kaluza-Klein Spacetime
• Finite temperature Casimir effect in spacetime with extra compactified dimensions
• Colliding branes and formation of spacetime singularities in string theory
• Orbifold Branes in the $M_D\times M_{d^{+}}\times M_{d^{-}}$ Compactification of type II string on $S^1/Z_2$ and their cosmological applications