383 citations
- Universität HamburgDE29 papers
- Stockholm UniversitySE25 papers
- University of WaterlooCA22 papers
- Sapienza University of RomeIT14 papers
- University of L'AquilaIT12 papers
- Chalmers University of TechnologySE11 papers
- KTH Royal Institute of TechnologySE11 papers
- Laboratoire de Physique Théorique et Hautes EnergiesFR11 papers
- University of ViennaAT11 papers
- ETH ZurichCH10 papers
- Max Planck Institute for Gravitational PhysicsDE10 papers
- Nordic Institute for Theoretical PhysicsSE9 papers
5 papers · 1 filter
One-Loop Kahler Metric of D-Branes at Angles
Marcus Berg, Michael Haack, Jin U Kang
We evaluate string one-loop contributions to the Kahler metric of D-brane moduli (positions and Wilson lines), in toroidal orientifolds with branes at angles. Contributions due to…
Scalar Cosmological Perturbations
Claes Uggla, John Wainwright
Scalar perturbations of Friedmann-Lemaitre cosmologies can be analyzed in a variety of ways using Einstein's field equations, the Ricci and Bianchi identities, or the conservation…
Modular invariant Frobenius algebras from ribbon Hopf algebra automorphisms
Jurgen Fuchs, Christoph Schweigert, Carl Stigner
For any finite-dimensional factorizable ribbon Hopf algebra H and any ribbon automorphism omega of H, we establish the existence of the following structure: an H-bimodule F_omega a…
The initial singularity of ultrastiff perfect fluid spacetimes without symmetries
J. Mark Heinzle, Patrik Sandin
We consider the Einstein equations coupled to an ultrastiff perfect fluid and prove the existence of a family of solutions with an initial singularity whose structure is that of ex…
Cosmological Perturbation Theory Revisited
Claes Uggla, John Wainwright
Increasingly accurate observations are driving theoretical cosmology toward the use of more sophisticated descriptions of matter and the study of nonlinear perturbations of FL cosm…