Four-derivative interactions in asymptotically safe gravity (2009)
Benedetti, Dario, Machado, Pedro F., Saueressig, Frank
We summarize recent progress in understanding the role of higher-derivative terms in the asymptotic safety scenario of gravity. Extending previous computations based on the functional renormalization...
Quantum mirror symmetry and twistors (2009)
Alexandrov, Sergei, Saueressig, Frank
Using the twistor approach to hypermultiplet moduli spaces, we derive the worldsheet, D(-1), and D1-instanton contributions to the generalized mirror map, relating Type IIA and Type IIB string theory...
Taming perturbative divergences in asymptotically safe gravity (2009)
Benedetti, Dario, Machado, Pedro F., Saueressig, Frank
We use functional renormalization group methods to study gravity minimally coupled to a free scalar field. This setup provides the prototype of a gravitational theory which is perturbatively...
Asymptotic safety in higher-derivative gravity (2009)
Benedetti, Dario, Machado, Pedro F., Saueressig, Frank
We study the non-perturbative renormalization group flow of higher-derivative gravity employing functional renormalization group techniques. The beta-functions give rise to a non-trivial ultraviolet...
D-instantons and twistors (2008)
Alexandrov, Sergei, Pioline, Boris, Saueressig, Frank, Vandoren, Stefan
Finding the exact, quantum corrected metric on the hypermultiplet moduli space in Type II string compactifications on Calabi-Yau threefolds is an outstanding open problem. We address this issue by...
Linear perturbations of quaternionic metrics - II. The quaternionic-Kahler case (2008)
Alexandrov, Sergei, Pioline, Boris, Saueressig, Frank, Vandoren, Stefan
We extend the twistor methods developed in our earlier work on linear deformations of hyperkahler manifolds [arXiv:0806.4620] to the case of quaternionic-Kahler manifolds. Via Swann's construction,...
Linear perturbations of Hyperkahler metrics (2008)
Alexandrov, Sergei, Pioline, Boris, Saueressig, Frank, Vandoren, Stefan
We study general linear perturbations of a class of 4d real-dimensional hyperkahler manifolds obtainable by the (generalized) Legendre transform method. Using twistor methods, we show that...
On the renormalization group flow of f(R)-gravity (2008)
Machado, Pedro F., Saueressig, Frank
We use the functional renormalization group equation for quantum gravity to construct a non-perturbative flow equation for modified gravity theories of the form $S = \int d^dx \sqrt{g} f(R)$. Based...
On the renormalization group flow of f(R)-gravity (2007)
Machado, Pedro F., Saueressig, Frank
We use the functional renormalization group equation for quantum gravity to construct a non-perturbative flow equation for modified gravity theories of the form $S = \int d^dx \sqrt{g} f(R)$. Based...
Recent results in four-dimensional non-perturbative string theory (2007)
We review recent progress in understanding non-perturbative instanton corrections to the hypermultiplet moduli space in type II string compactifications on Calabi-Yau threefolds.
Functional Renormalization Group Equations, Asymptotic Safety, and Quantum Einstein Gravity (2007)
Reuter, Martin, Saueressig, Frank
These lecture notes provide a pedagogical introduction to a specific continuum implementation of the Wilsonian renormalization group, the effective average action. Its general properties and, in...
Membrane instantons from mirror symmetry (2007)
Robles-Llana, Daniel, Saueressig, Frank, Theis, Ulrich, Vandoren, Stefan
We use mirror symmetry to determine and sum up a class of membrane instanton corrections to the hypermultiplet moduli space metric arising in Calabi-Yau threefold compactifications of type IIA...
Special geometry of euclidean supersymmetry II. Hypermultiplets and the $c$-map (2007)
Mayer, Christoph, Mohaupt, Thomas, Saueressig, Frank, Cortés, Vicente
We construct two new versions of the c-map which allow us to obtain the target manifolds of hypermultiplets in euclidean theories with rigid Script $N = 2$ supersymmetry. While the minkowskian...
Conifold singularities, resumming instantons and non-perturbative mirror symmetry (2007)
Saueressig, Frank, Vandoren, Stefan
We determine the instanton corrected hypermultiplet moduli space in type IIB compactifications near a Calabi-Yau conifold point where the size of a two-cycle shrinks to zero. We show that...
Orientifolding in N=2 Superspace (2007)
Robles-Llana, Daniel, Rocek, Martin, Saueressig, Frank, Theis, Ulrich, Vandoren, Stefan
We discuss orientifold projections on superspace effective actions for hypermultiplets. We present a simple and new mechanism that allows one to find the Kahler potential and complex structure for...
Tensor supermultiplets and toric quaternion-Kahler geometry (2007)
De Wit, Bernard, Saueressig, Frank
We review the relation between 4n-dimensional quaternion-Kahler metrics with n+1 abelian isometries and superconformal theories of n+1 tensor supermultiplets. As an application we construct the class...
Orientifolding in N = 2 Superspace (2007)
Robles-Llana, D., Rocek, M., Saueressig, Frank, Theis, U., Vandoren, S.
We discuss orientifold projections on superspace effective actions for hypermultiplets. We present a simple and new mechanism that allows one to find the K¨ahler potential and complex structure for...
Robles-Llana, Daniel, Rocek, Martin, Saueressig, Frank, Theis, Ulrich, Vandoren, Stefan
We find the D(-1) and D1-brane instanton contributions to the hypermultiplet moduli space of type IIB string compactifications on Calabi-Yau threefolds. These combine with known perturbative and...
Membrane and fivebrane instantons from quaternionic geometry (2006)
Alexandrov, Sergei, Saueressig, Frank, Vandoren, Stefan
We determine the one-instanton corrections to the universal hypermultiplet moduli space coming both from Euclidean membranes and NS-fivebranes wrapping the cycles of a (rigid) Calabi-Yau threefold....
Off-shell N=2 tensor supermultiplets (2006)
De Wit, Bernard, Saueressig, Frank
A multiplet calculus is presented for an arbitrary number n of N=2 tensor supermultiplets. For rigid supersymmetry the known couplings are reproduced. In the superconformal case the target spaces...
String loop corrected hypermultiplet moduli spaces (2006)
Robles-Llana, Daniel, Saueressig, Frank, Vandoren, Stefan
Using constraints from supersymmetry and string perturbation theory, we determine the string loop corrections to the hypermultiplet moduli space of type II strings compactified on a generic...
Some exact results in four-dimensional non-perturbative string theory (2006)
Robles-Llana, D., Rocek, M., Saueressig, Frank, Theis, U., Vandoren, S.
We find the D(−1) and D1-brane instanton contributions to the hypermultiplet moduli space of type IIB string compactifications on Calabi–Yau threefolds. These combine with known perturbative and...
Membrane and fivebrane instantons from quaternionic (2006)
Alexandrov, S., Saueressig, Frank, Vandoren, S.
We determine the one-instanton corrections to the universal hypermultiplet moduli space coming both from Euclidean membranes and NS-fivebranes wrapping the cycles of a (rigid) Calabi-Yau threefold....
String loop corrected hypermultiplet moduli spaces (2006)
Robles-Llana, D., Saueressig, Frank, Vandoren, S.
Using constraints from supersymmetry and string perturbation theory, we determine the string loop corrections to the hypermultiplet moduli space of type II strings compactified on a generic...
On de Sitter Vacua in Type IIA Orientifold Compactifications (2005)
Saueressig, Frank, Theis, Ulrich, Vandoren, Stefan
This letter discusses the orientifold projection of the quantum corrections to type IIA strings compactified on rigid Calabi-Yau threefolds. It is shown that N=2 membrane instanton effects give a...
Membrane Instantons and de Sitter Vacua (2005)
Davidse, Marijn, Saueressig, Frank, Theis, Ulrich, Vandoren, Stefan
We investigate membrane instanton effects in type IIA strings compactified on rigid Calabi-Yau manifolds. These effects contribute to the low-energy effective action of the universal hypermultiplet....
Special geometry of Euclidean supersymmetry II: hypermultiplets and the c-map (2005)
Cortes, Vicente, Mayer, Christoph, Mohaupt, Thomas, Saueressig, Frank
We construct two new versions of the c-map which allow us to obtain the target manifolds of hypermultiplets in Euclidean theories with rigid N =2 supersymmetry. While the Minkowskian para-c-map is...
Conifold Cosmologies in IIA String Theory (2005)
Mohaupt, Thomas, Saueressig, Frank
We discuss the extension of our recent work hep-th/0410272, hep-th/0410273 to general conifold transitions and type-IIA string theory.
On de Sitter vacua in type IIA orientifold compactifications (2005)
Saueressig, Frank, Theis, U., Vandoren, S.
This letter discusses the orientifold projection of the quantum corrections to type IIA strings compactified on rigid Calabi-Yau threefolds. It is shown that N = 2 membrane instanton effects give a...
Membrane instantons and de Sitter vacua (2005)
Davidse, M., Saueressig, Frank, Theis, U., Vandoren, S.
We investigate membrane instanton effects in type IIA strings compactified on rigid Calabi-Yau manifolds. These effects contribute to the low-energy effective action of the universal hypermultiplet....
Effective Supergravity Actions for Conifold Transitions (2004)
Mohaupt, Thomas, Saueressig, Frank
We construct gauged supergravity actions which describe the dynamics of M-theory on a Calabi-Yau threefold in the vicinity of a conifold transition. The actions explicitly include N charged...
Dynamical Conifold Transitions and Moduli Trapping in M-Theory Cosmology (2004)
Mohaupt, Thomas, Saueressig, Frank
We study five-dimensional Kasner cosmologies in the vicinity of a conifold locus occurring in a time-dependent Calabi-Yau compactification of M-theory. The dynamics of M2-brane winding modes, which...
Topological Phase Transitions in Calabi-Yau Compactifications of M-Theory (2004)
We construct five-dimensional gauged supergravity actions which describe flop and conifold transitions in M-theory compactified on Calabi-Yau threefolds. While the vector multiplet sector is...
Phase Space Analysis of Quintessence Cosmologies with a Double Exponential Potential (2004)
Jarv, Laur, Mohaupt, Thomas, Saueressig, Frank
We use phase space methods to investigate closed, flat, and open Friedmann-Robertson-Walker cosmologies with a scalar potential given by the sum of two exponential terms. The form of the potential is...
Topological phase transitions in Calabi-Yau compactifications of M-theory / (2004)
Jena, University, Diss., 2004 (Nicht für den Austausch).
Space-Time Singularities and the Kahler Cone (2003)
Jarv, Laur, Mayer, Christoph, Mohaupt, Thomas, Saueressig, Frank
We review recent results on the interplay between the five-dimensional space-time and the internal manifold in Calabi-Yau compactifications of M-theory. Black string, black hole and domain wall...
Special Geometry of Euclidean Supersymmetry I: Vector Multiplets (2003)
Cortes, Vicente, Mayer, Christoph, Mohaupt, Thomas, Saueressig, Frank
We construct the general action for Abelian vector multiplets in rigid 4-dimensional Euclidean (instead of Minkowskian) N=2 supersymmetry, i.e., over space-times with a positive definite instead of a...
Singular compactifications and cosmology (2003)
Jarv, Laur, Mohaupt, Thomas, Saueressig, Frank
We summarize our recent results of studying five-dimensional Kasner cosmologies in a time-dependent Calabi-Yau compactification of M-theory undergoing a topological flop transition. The dynamics of...
Effective Supergravity Actions for Flop Transitions (2003)
Jarv, Laur, Mohaupt, Thomas, Saueressig, Frank
We construct a family of five-dimensional gauged supergravity actions which describe flop transitions of M-theory compactified on Calabi-Yau threefolds. While the vector multiplet sector can be...
M-theory cosmologies from singular Calabi-Yau compactifications (2003)
Jarv, Laur, Mohaupt, Thomas, Saueressig, Frank
We study five-dimensional Kasner cosmologies in a time-dependent Calabi-Yau compactification of M-theory undergoing a flop transition. The dynamics of the additional states, which become massless at...