Now showing items 1-20 of 46

• #### Aspects of Symmetry in de Sitter Space ﻿

(2014-06-06)
We study various aspects of symmetry in four-dimensional de Sitter space (dS$_4$).
• #### Asymptotic Symmetries and Charges in De Sitter Space ﻿

(Institute of Physics Publishing, 2011)
The asymptotic symmetry group (ASG) at future null infinity $(I^+)$ of four-dimensional de Sitter spacetimes is defined and shown to be given by the group of three-dimensional diffeomorphisms acting on $I^+$. Finite ...
• #### Asymptotic symmetries of Yang-Mills theory ﻿

(Springer Science + Business Media, 2014)
Asymptotic symmetries at future null infinity (I +) of Minkowski space for electrodynamics with massless charged fields, as well as non-Abelian gauge theories with gauge group G, are considered at the semiclassical level. ...
• #### Black hole deconstruction ﻿

(Springer-Verlag, 2012)
A D4-D0 black hole can be deconstructed into a bound state of D0 branes with a D6-D6 pair containing worldvolume fluxes. The exact spacetime solution is known and resembles a D0 accretion disk surrounding a D6-D6 core. We ...
• #### Black Hole Superradiance From Kerr/CFT ﻿

(Springer Verlag, 2010)
The superradiant scattering of a scalar field with frequency and angular momentum (w,m) by a near-extreme Kerr black hole with mass and spin (M, J) was derived in the seventies by Starobinsky, Churilov, Press and Teukolsky. ...
• #### Black holes as incompressible fluids on the sphere ﻿

(Springer-Verlag, 2012)
We consider finite deformations of the p + 2-dimensional Schwarzschild geometry which obey the vacuum Einstein equation, preserve the mean curvature and induced conformal metric on a sphere a distance λ from the horizon ...
• #### BMS supertranslations and Weinberg’s soft graviton theorem ﻿

(Springer Science + Business Media, 2015)
Recently it was conjectured that a certain infinite-dimensional “diagonal” subgroup of BMS supertranslations acting on past and future null infinity (I − and I +) is an exact symmetry of the quantum gravity S-matrix, and ...
• #### Central Charge for $AdS_2$ Quantum Gravity ﻿

(Institute of Physics, 2009)
Two-dimensional Maxwell-dilaton quantum gravity on $AdS_2$ with radius $\ell$ and a constant electric field $E$ is studied. In conformal gauge, this is equivalent to a CFT on a strip. In order to maintain consistent ...
• #### CFT Duals for Extreme Black Holes ﻿

(Institute of Physics Publishing, 2009)
It is argued that the general four-dimensional extremal Kerr-Newman-AdS-dS black hole is holographically dual to a (chiral half of a) two-dimensional CFT, generalizing an argument given recently for the special case of ...
• #### Chiral Gravity in Three Dimensions ﻿

(Springer, 2008)
Three dimensional Einstein gravity with negative cosmological constant $-1/\ell^2$ deformed by a gravitational Chern-Simons action with coefficient $1/\mu$ is studied in an asymptotically $AdS_3$ spacetime. It is ...
• #### Chiral Gravity, Log Gravity, and Extremal CFT ﻿

(American Physical Society, 2010)
We show that the linearization of all exact solutions of classical chiral gravity around the AdS3 vacuum have positive energy. Non-chiral and negative-energy solutions of the linearized equations are infrared divergent at ...
• #### Chiral Liouville Gravity ﻿

(Springer Science + Business Media, 2013)
Classical two-dimensional Liouville gravity is often considered in conformal gauge which has a residual left and right Virasoro symmetry algebra. We consider an alternate, chiral, gauge which has a residual right Virasoro ...
• #### Chiral Scale and Conformal Invariance in 2D Quantum Field Theory ﻿

(American Physical Society, 2011)
It is well known that a local, unitary Poincaré-invariant 2D quantum field theory with a global scaling symmetry and a discrete non-negative spectrum of scaling dimensions necessarily has both a left and a right local ...
• #### D-brane Construction of the 5D NHEK Dual ﻿

(Springer-Verlag, 2012)
Extremal but non-supersymmetric charged black holes with $SU(2)_L$ spin in IIB string theory compactified to five dimensions on $K^3 \times S^1$ are considered. These have a near-horizon or NHEK region with an enhanced ...
• #### The Einstein and the Navier-Stokes Equations: Connecting the Two ﻿

(2013-02-22)
This thesis establishes a precise mathematical connection between the Einstein equations of general relativity and the incompressible Navier-Stokes equation of fluid dynamics. We carry out a holographic analysis which ...
• #### Fast plunges into Kerr black holes ﻿

(Springer Nature, 2015)
Most extreme-mass-ratio-inspirals of small compact objects into supermassive black holes end with a fast plunge from an eccentric last stable orbit. For rapidly rotating black holes such fast plunges may be studied in the ...
• #### Five Problems in Quantum Gravity ﻿

(Elsevier, 2009)
We present five open problems in quantum gravity which one might reasonably hope to solve in the next decade. Hints appearing in the literature are summarized for each one.
• #### Force-free electrodynamics around extreme Kerr black holes ﻿

(Springer Science + Business Media, 2014)
Plasma-filled magnetospheres can extract energy from a spinning black hole and provide the power source for a variety of observed astrophysical phenomena. These magnetospheres are described by the highly nonlinear equations ...
• #### From Navier-Stokes to Einstein ﻿

(Springer-Verlag, 2012)
We show by explicit construction that for every solution of the incompressible Navier-Stokes equation in $p + 1$ dimensions, there is a uniquely associated “dual” solution of the vacuum Einstein equations in $p + 2$ ...
• #### From Petrov-Einstein to Navier-Stokes ﻿

(2014-06-06)
The fluid/gravity correspondence relates solutions of the incompressible Navier-Stokes equation to metrics which solve the Einstein equations. We propose propose two possible approaches to establish this correspondence: ...