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We obtain dS and AdS generalized Reissner-Nordstrom like black holegeometries in a curved D3-brane frame-work, underlying a noncommutative gaugetheory on the brane-world. The noncommutative scaling limit is explored toinvestigate a possible tunneling of an AdS vacuum in string theory to dS vacuumin its low energy gravity theory. The Hagedorn transition is invoked into itsself-dual gauge theory to decouple the gauge nonlinearity from the dS geometry,which in turn is shown to describe a pure dS vacuum.Comment: 7-page

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Tunneling between de Sitter and anti-de Sitter black holes in a noncommutative<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="normal">D</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>-brane formalism

Tunneling between de Sitter and anti-de Sitter black holes in a noncommutativeD3-brane formalism