Supergravity Approach to Tachyon Potential in Brane-Antibrane Systems

Abstract

Using an exact supergravity solution representing the Dp-\bar{Dp} system, it is demonstrated that one can construct a supergravity analogue of the tachyon potential. Remarkably, the (regularized) minimum value of the potential turns out to be V(T_{0})=-2m with m denoting the ADM mass of a single Dp-brane. This result, in a sense, appears to confirm that Sen's conjecture for the tachyon condensation on unstable D-branes is indeed correct although the analysis used here is semi-classical in nature and hence should be taken with some care. Also shown is the fact that the tachyon mass squared m^2_{T} (which has started out as being negative) can actually become positive definite and large as the tachyon rolls down toward the minimum of its potential. It indeed signals the possibility of successful condensation of the tachyon since it shows that near the minimum of its potential, tachyon can become heavy enough to disappear from the massless spectrum. Some cosmological implications of this tachyon potential in the context of ``rolling tachyons'' is also discussed.

26 pages, 2 eps figures, Corrected reference, To appear in JHEP

References in corpus (7)

• Rolling Tachyon
• Tachyon Matter
• Field Theory of Tachyon Matter
• Cosmological Evolution of the Rolling Tachyon
• Inflation from a Tachyon Fluid?
• TeV scale 5D $SU(3{)}_W$ unification and the fixed point anomaly cancellation with chiral split multiplets
• Dynamical Decay of Brane-Antibrane and Dielectric Brane

Cited by in corpus (10)

• Tachyon Dynamics in Open String Theory
• Extended tachyon field, Chaplygin gas and solvable k-essence cosmologies
• Inflation from a Tachyon Fluid?
• Dynamical Decay of Brane-Antibrane and Dielectric Brane
• Gravitational Approach to Tachyon Matter
• Gauge Fields and Scalars in Rolling Tachyon Backgrounds
• Hamilton-Jacobi Formalism for Tachyon Inflation
• Constraints on tachyon inflationary models with an AdS/CFT correspondence
• Fubini instantons in curved space
• Open string tachyon is the stringy inflaton