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U duality and M theory

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R2 corrections and non-perturbative dualities of N = 4 string ground states

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Action Principle for Newtonian Gravity.

An action is derived whose equations of motion contain the Poisson equation of Newtonian gravity, allowing for the effect of gravitational time dilation due to strong gravitational fields.
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The Phase Structure of Higher-Dimensional Black Rings and Black Holes

We construct an approximate solution for an asymptotically flat, neutral, thin rotating black ring in any dimension D ≥ 5 by matching the near-horizon solution for a bent boosted black string, to a…
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Nonrelativistic strings and limits of the AdS/CFT correspondence

Using target space null reduction of the Polyakov action, we find a novel covariant action for strings moving in a torsional Newton-Cartan geometry. Sending the string tension to zero while rescaling…
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Eisenstein Series and String Thresholds

Abstract:We investigate the relevance of Eisenstein series for representing certain G(ℤ)-invariant string theory amplitudes which receive corrections from BPS states only. G(ℤ) may stand for any of…
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Hořava-Lifshitz gravity from dynamical Newton-Cartan geometry

A bstractRecently it has been established that torsional Newton-Cartan (TNC) geometry is the appropriate geometrical framework to which non-relativistic field theories couple. We show that when these…
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Essentials of blackfold dynamics

We develop and significantly generalize the effective worldvolume theory for higher-dimensional black holes recently proposed by the authors. The theory, which regards the black hole as a black brane…
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Nonrelativistic Chern-Simons theories and three-dimensional Hořava-Lifshitz gravity

We show that certain three-dimensional Ho\ifmmode \check{r}\else \v{r}\fi{}ava-Lifshitz gravity theories can be written as Chern-Simons gauge theories on various nonrelativistic algebras. The…
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Relating non-relativistic string theories

Non-relativistic string theories promise to provide simpler theories of quantum gravity as well as tractable limits of the AdS/CFT correspondence. However, several apparently distinct…
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