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String Theory Effects on FiveDimensional Black Hole Physics
, 2008
"... We review recent developments in understanding quantum/string corrections to BPS black holes and strings in fivedimensional supergravity. These objects are solutions to the effective action obtained from Mtheory compactified on a CalabiYau threefold, including the oneloop corrections determined ..."
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We review recent developments in understanding quantum/string corrections to BPS black holes and strings in fivedimensional supergravity. These objects are solutions to the effective action obtained from Mtheory compactified on a CalabiYau threefold, including the oneloop corrections determined by anomaly cancellation and supersymmetry. We introduce the offshell formulation of this theory obtained through the conformal supergravity method and review the methods for investigating supersymmetric solutions. This leads to quantum/string corrected attractor geometries, as well as asymptotically flat black strings and spinning black holes. With these solutions in hand, we compare our results with analogous studies in fourdimensional stringcorrected supergravity, emphasizing the distinctions between the four and five dimensional theories.
Almost BPS black holes
, 812
"... k.goldstein [at] uu.nl, s.katmadas [at] uu.nl Abstract: We study nonBPS black hole solutions to ungauged supergravity with 8 supercharges coupled to vector multiplets in four and five dimensions. We identify a large class of five dimensional nonBPS solutions, which we call “almost BPS”, that are s ..."
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k.goldstein [at] uu.nl, s.katmadas [at] uu.nl Abstract: We study nonBPS black hole solutions to ungauged supergravity with 8 supercharges coupled to vector multiplets in four and five dimensions. We identify a large class of five dimensional nonBPS solutions, which we call “almost BPS”, that are supersymmetric on local patches and satisfy a first order flow governed by harmonic functions. By dimensional reduction, they give rise to new nonBPS solutions in four dimensions. These solutions allow for some nontrivial asymptotic moduli and multiple centres, similar to their globally supersymmetric cousins. We explicitly discuss a single centre and a two centre example.
Nearhorizon branescan revived
, 804
"... In 1987 two versions of the branescan of Ddimensional super pbranes were put forward. The first pinpointed those (p, D) slots consistent with kappasymmetric GreenSchwarz type actions; the second generalized the membrane at the end of the universe idea to all those superconformal groups describi ..."
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In 1987 two versions of the branescan of Ddimensional super pbranes were put forward. The first pinpointed those (p, D) slots consistent with kappasymmetric GreenSchwarz type actions; the second generalized the membrane at the end of the universe idea to all those superconformal groups describing pbranes on the boundary of AdSp+2 ×S D−p−2. Although the second version predicted D3 and M5 branes in addition to those of the first, it came unstuck because the 1/2 BPS solitonic branes failed to exhibit the required symmetry enhancement in the nearhorizon limit, except in the nondilatonic cases (p = 2, D = 11), (p = 3, D = 10) and (p = 5, D = 11). Just recently, however, it has been argued that the fundamental D = 10 heterotic string does indeed display a nearhorizon enhancement to OSp(82) as predicted by the branescan, provided α ′ corrections are taken into account. If this logic could be extended to the other strings and branes, it would resolve this 21yearold paradox and provide a wealth of new AdS/CFT dualities, which we tabulate.
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"... Corrections to the statistical entropy of five dimensional black holes This article has been downloaded from IOPscience. Please scroll down to see the full text article. JHEP06(2009)024 ..."
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Corrections to the statistical entropy of five dimensional black holes This article has been downloaded from IOPscience. Please scroll down to see the full text article. JHEP06(2009)024
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, 2008
"... iv ter 5, where we implicitly construct a worldsheet CFT as the IR limit of an N = 2 gauge theory. Spacetime torsion (nonKählerity) is incorporated via a twodimensional GreenSchwarz mechanism in which a doublet of axions cancels the gauge anomaly. We also argue that these models are smoothly exte ..."
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iv ter 5, where we implicitly construct a worldsheet CFT as the IR limit of an N = 2 gauge theory. Spacetime torsion (nonKählerity) is incorporated via a twodimensional GreenSchwarz mechanism in which a doublet of axions cancels the gauge anomaly. We also argue that these models are smoothly extendable to solutions of the exact betafunction equations. By string dualities, these solutions provide a microscopic description of certain type IIB RRflux vacua. Finally, in chapter 6 we use recent developments to argue that there exists a holographic dual for the CFT living on a stack of N heterotic strings in R 4,1 × T 5; this should also be describable by an exact worldsheet CFT. We use supergravity to show that the global supergroup of the background is Osp(4 ∗ 4), with an affine extension given, surprisingly, by a nonlinear, N = 8 superconformal algebra. We also suggest a correspondence between supergroups with 16 supercharges and T n compactification with 0 ≤ n ≤ 7.Contents
Nearhorizon branescan revived
, 804
"... In 1987 two versions of the branescan of Ddimensional super pbranes were put forward. The first pinpointed those (p,D) slots consistent with kappasymmetric GreenSchwarz type actions; the second generalized the membrane at the end of the universe idea to all those superconformal groups describin ..."
Abstract
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In 1987 two versions of the branescan of Ddimensional super pbranes were put forward. The first pinpointed those (p,D) slots consistent with kappasymmetric GreenSchwarz type actions; the second generalized the membrane at the end of the universe idea to all those superconformal groups describing pbranes on the boundary of AdSp+2 ×SD−p−2. Although the second version predicted D3 and M5 branes in addition to those of the first, it came unstuck because the 1/2 BPS solitonic branes failed to exhibit the required symmetry enhancement in the nearhorizon limit, except in the nondilatonic cases (p = 2,D = 11), (p = 3,D = 10) and (p = 5,D = 11). Just recently, however, it has been argued that the fundamental D = 10 heterotic string does indeed display a nearhorizon enhancement to OSp(82) as predicted by the branescan, provided α ′ corrections are taken into account. If this logic could be extended to the other strings and branes, it would resolve this 21yearold paradox and provide a wealth of new AdS/CFT dualities, which we tabulate.
Nearhorizon branescan revived
, 804
"... In 1987 two versions of the branescan of Ddimensional super pbranes were put forward. The first pinpointed those (p,D) slots consistent with kappasymmetric GreenSchwarz type actions; the second generalized the membrane at the end of the universe idea to all those superconformal groups describin ..."
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In 1987 two versions of the branescan of Ddimensional super pbranes were put forward. The first pinpointed those (p,D) slots consistent with kappasymmetric GreenSchwarz type actions; the second generalized the membrane at the end of the universe idea to all those superconformal groups describing pbranes on the boundary of AdSp+2 ×SD−p−2. Although the second version predicted D3 and M5 branes in addition to those of the first, it came unstuck because the 1/2 BPS solitonic branes failed to exhibit the required symmetry enhancement in the nearhorizon limit, except in the nondilatonic cases (p = 2,D = 11), (p = 3,D = 10) and (p = 5,D = 11). Just recently, however, it has been argued that the fundamental D = 10 heterotic string does indeed display a nearhorizon enhancement to OSp(28) as predicted by the branescan, provided α ′ corrections are taken into account. If this logic could be extended to the other strings and branes, it would resolve this 21yearold paradox and provide new AdS/CFT dualities.
Resolving Gravitational Singularities
, 808
"... Abstract. We review recent progress on the resolution of gravitational singularities in string theory. The main example is the fundamental string in five dimensions which is singular in the standard supergravity description but regular after taking into account higher derivative corrections determin ..."
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Abstract. We review recent progress on the resolution of gravitational singularities in string theory. The main example is the fundamental string in five dimensions which is singular in the standard supergravity description but regular after taking into account higher derivative corrections determined by anomalies and supersymmetry. The application of the AdS/CFT correspondence to geometries that require higher derivatives for regularity poses interesting challenges. 1.