AdS and dS Entropy from String Junctions

Abstract

Flux compactifications of string theory exhibiting the possibility of discretely tuning the cosmological constant to small values have been constructed. The highly tuned vacua in this discretuum have curvature radii which scale as large powers of the flux quantum numbers, exponential in the number of cycles in the compactification. By the arguments of Susskind/Witten (in the AdS case) and Gibbons/Hawking (in the dS case), we expect correspondingly large entropies associated with these vacua. If they are to provide a dual description of these vacua on their Coulomb branch, branes traded for the flux need to account for this entropy at the appropriate energy scale. In this note, we argue that simple string junctions and webs ending on the branes can account for this large entropy, obtaining a rough estimate for junction entropy that agrees with the existing rough estimates for the spacing of the discretuum. In particular, the brane entropy can account for the (A)dS entropy far away from string scale correspondence limits.

18 pages, harvmac big

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• Holographic duality with a view toward many-body physics
• Moduli Stabilization from Fluxes in a Simple IIB Orientifold
• The Scaling of the No Scale Potential and de Sitter Model Building
• Simple de Sitter Solutions
• The Cosmological Constant and the String Landscape
• A New Handle on de Sitter Compactifications
• TASI/PiTP/ISS Lectures on Moduli and Microphysics
• Landskepticism: or Why Effective Potentials Don't Count String Models
• On the Conformal Field Theory Duals of type IIA AdS_4 Flux Compactifications
• Orbifold Physics and de Sitter Spacetime