Now showing items 1-10 of 64
Holography, diffeomorphisms, and scaling violations in the CMB
(IOP Publishing Ltd, 2004-07-01)
We analyze diffeomorphism invariance in inflationary spacetimes regulated by a boundary at late time. We present the action for quadratic fluctuations in the presence of a boundary, and verify that it is gauge invariant ...
Holographic gravitational anomalies
(IOP Publishing Ltd, 2006-01-01)
In the AdS/CFT correspondence one encounters theories that are not invariant under diffeomorphisms. In the boundary theory this is a gravitational anomaly, and can arise in 4k+2 dimensions. In the bulk, there can be ...
De Sitter Holography and the Cosmic Microwave Background
(IOP Publishing Ltd, 2002-04-01)
We interpret cosmological evolution holographically as a renormalisation group flow in a dual euclidean field theory, as suggested by the conjectured dS/CFT correspondence. Inflation is described by perturbing around ...
Rolling tachyons and decaying branes
(IOP Publishing Ltd, 2003-02-01)
We present new rolling tachyon solutions describing the classical decay of D-branes. Our methods are simpler than those appearing in recent works, yet our results are exact in classical string theory. The role of ...
Heterotic strings in two dimensions and new stringy phase transitions
(IOP Publishing Ltd, 2005-08-01)
We discuss heterotic string theories in two dimensions with gauge groups Spin(24) and Spin(8) × E8. After compactification the theories exhibit a rich spectrum of states with both winding and momentum. At special ...
LETTER: The Life and Times of Extremal Black Holes
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 2000-11)
Charged extremal black holes cannot fully evaporate through the Hawking effect and are thus long lived. Over their lifetimes, these black holes take part in a variety of astrophysical processes, including many that lead ...
Spinning up asymptotically flat spacetimes
(IOP Publishing Ltd, 2004-12-07)
We present a method for constructing stationary, asymptotically flat, rotating solutions of Einstein's field equations. One of the spun-up solutions has quasilocal mass but no global mass. It has an ergosphere but no event ...
Entropy of thermally excited black rings
(IOP Publishing Ltd, 2005-10-01)
A string theory description of near extremal black rings is proposed. The entropy is computed and the thermodynamic properties are derived for a large family of black rings that have not yet been constructed in ...
On black hole thermodynamics of 2-D type 0A
(IOP Publishing Ltd, 2004-03-01)
We present a detailed analysis of the thermodynamics of two dimensional black hole solutions to type 0A with q units of electric and magnetic flux. We compute the free energy and derived quantities such as entropy and ...
Microscopic black hole entropy in theories with higher derivatives
(IOP Publishing Ltd, 2005-09-01)
We discuss higher derivative corrections to black hole entropy in theories that allow a near horizon AdS3 × X geometry. In arbitrary theories with diffeomorphism invariance we show how to obtain the spacetime central ...