AdS_3/LCFT_2 -- Correlators in Cosmological Topologically Massive Gravity (2009)
For cosmological topologically massive gravity at the chiral point we calculate momentum space 2- and 3-point correlators of operators in the postulated dual CFT on the cylinder. These operators are...
Bouncing universe and non-BPS branes (2009)
Loewenfeld, Philipp Höffer V., Kang, Jin U, Moeller, Nicolas, Sachs, Ivo
We describe string frame bouncing universe scenarios involving the creation and annihilation of a non-BPS D9-brane in type IIA superstring theory. We find several classes of solutions, in which the...
Quasi-Normal Modes for Logarithmic Conformal Field Theory (2008)
We generalize the one-to one correspondence between quasi normal modes in 3- dimensional anti deSitter black holes and the poles of the retarded correlators in the boundary conformal field theory to...
Quasi-Normal Modes in Topologically Massive Gravity (2008)
Sachs, Ivo, Solodukhin, Sergey N.
We determine the black hole quasi-normal mode spectrum for tensor perturbations in topologically massive AdS-gravity. In the special case of chiral gravity quasi-normal modes are absent despite of...
Resolution of Curvature Singularities in Higher Derivative Gravity (2008)
Loewenfeld, Philipp Höffer V., Sachs, Ivo
We consider possible resolutions of singularities in a contracting anisotropic universe for a class of higher derivative gravity theories. We give evidence that for our models the big crunch...
Factorization Conjecture and the Open/Closed String Correspondence (2008)
Marcus Baumgartl, Ivo Sachs, Samson L. Shatashvili
We present evidence for the factorization of the world-sheet path integrals for 2d con-formal field theories on the disk into bulk and boundary contributions. This factorization is then used to...
Open-Closed String Correspondence in Open String Field Theory (2008)
We address the problem of describing different closed string backgrounds in background independent open string field theory: A shift in the closed string background corresponds to a collective...
Three-Dimensional Black Holes and String Theory (2007)
Danny Birmingham, Ivo Sachs, Siddhartha Sen
The exact decay rate for emission of massless minimally coupled scalar fields by a non-extremal black hole in 2 + 1 dimensions is obtained. At low energy, the decay rate into scalars with zero...
Stringy NJL and Gross-Neveu models at finite density and temperature (2007)
Davis, Joshua L., Gutperle, Michael, Kraus, Per, Sachs, Ivo
Nonlocal stringy versions of the Nambu-Jona-Lasinio and Gross-Neveu models arise in a certain limit of holographic QCD. We analyze the phase structure at finite density and temperature at strong...
Low energy effective action in N=2 Yang-Mills as an integrated anomaly (2005)
Based on chiral ring relations and anomalies, as described by Cachazo, Douglas, Seiberg and Witten, we argue that the holomorphic effective action in N=2 Yang-Mills theory can be understood as an...
Low energy effective action in N=2 Yang-Mills as an integrated anomaly (2005)
Based on chiral ring relations and anomalies, as described by Cachazo, Douglas, Seiberg and Witten, we argue that the holomorphic effective action in N=2 Yang-Mills theory can be understood as an...
Factorization Conjecture and the Open/Closed String Correspondence (2004)
Baumgartl, Marcus, Sachs, Ivo, Shatashvili, Samson L.
We present evidence for the factorization of the world-sheet path integrals for 2d conformal field theories on the disk into bulk and boundary contributions. This factorization is then used to...
We review different applications of quasinormal modes to black hole physics, string theory and thermalisation in quantum field theory. In particular, we describe the the relation between quasi normal...
Relaxation in Conformal Field Theory, Hawking-Page Transition, and Quasinormal/Normal Modes (2002)
Birmingham, Danny, Sachs, Ivo, Solodukhin, Sergey N.
We study the process of relaxation back to thermal equilibrium in $(1+1)$-dimensional conformal field theory at finite temperature. When the size of the system is much larger than the inverse...
Conformal Field Theory Interpretation of Black Hole Quasi-normal Modes (2001)
Birmingham, Danny, Sachs, Ivo, Solodukhin, Sergey N.
We obtain exact expressions for the quasi-normal modes of various spin for the BTZ black hole. These modes determine the relaxation time of black hole perturbations. Exact agreement is found between...
Sachs, Ivo, Solodukhin, Sergey N.
A holographic correspondence between data on horizon and space-time physics is investigated. We find similarities with the AdS/CFT correspondence, based on the observation that the optical metric...
Exact Results for the BTZ Black Hole (2001)
Birmingham, Danny, Sachs, Ivo, Sen, Siddhartha
In this review, we summarize exact results for the three-dimensional BTZ black hole. We use rigorous mathematical results to clarify the general structure and properties of this black hole spacetime...
On Metric Perturbations in Brane-World Scenarios (2000)
In this note we reconsider linearised metric perturbations in the one-brane Randall-Sundrum Model. We present a simple formalism to describe metric perturbations caused by matter perturbations on the...
Non-Abelian Field Theory of stable non-BPS Branes (2000)
We derive the action for the non-abelian field theory living on parallel non-BPS D3-branes in type IIA theory on the orbifold T^4/I_4(-1)^F_L. The classical moduli space for the massless scalars...
Microscopic- versus Effective Coupling in N=2 Yang-Mills With Four Flavours (1999)
We determine the instanton corrections to the effective coupling in SU(2), N=2 Yang-Mills theory with four flavours to all orders. Our analysis uses the S(2,Z)-invariant curve and the two instanton...
Electric Black Holes in Type 0 String Theory (1999)
We discuss AdS_{2+1} (BTZ) black holes arising in type 0 string theory corresponding to D1-D5 and F1-NS5 bound states. In particular we describe a new family of non-dilatonic solutions with only...
Quantization of AdS_3 Black Holes in External Fields (1998)
2+1-dimensional Anti-deSitter gravity is quantized in the presence of an external scalar field. We find that the coupling between the scalar field and gravity is equivalently described by a perturbed...
Entropy of Three-Dimensional Black Holes in String Theory (1998)
Birmingham, Danny, Sachs, Ivo, Sen, Siddhartha
It is observed that the three-dimensional BTZ black hole is a supersymmetric solution of the low-energy field equations of heterotic string theory compactified on an Einstein space. The solution...