Calendar of Physics Talks Vienna

Applied Newton-Cartan Geometry

Speaker:	Eric Bergshoeff (Univ. of Groningen, NL)
Abstract:	I will give an introduction into the non-relativistic version of Riemannian geometry, which is called Newton-Cartan geometry. The corresponding non-relativistic gravity theory, called Newton-Cartan gravity, has received a renewed attention due to unexpected applications as a new tool to examine the (non-perturbative) properties of non-relativistic quantum field theories. I will explain the basic construction of Newton-Cartan gravity plus some of its generalizations thereby putting an emphasis on how these different theories can be obtained by taking limits or reductions of General Relativity.
Date:	Tue, 21.03.2017
Time:	14:15
Duration:	60 min
Location:	Fakult�t f�r Physik, Erwin-Schr�dinger-H�rsaal, Boltzmanngasse 5, 5. Stock
Contact:	S. Fredenhagen, H. Steinacker

Higher order perturbations of Anti-de Sitter space and time-periodic solutions of vacuum Einstein equations

Speaker:	Andrzej Rostworowski (Cracow)
Abstract:	Motivated by the problem of stability of Anti-de Sitter (AdS) spacetime, I will discuss nonlinear gravitational perturbations of maximally symmetric solutions of vacuum Einstein equations in general and the case of AdS in particular. I will present the evidence that, similarly to the self-gravitating scalar field at spherical symmetry, the negative cosmological constant allows for the existence of globally regular, asymptotically AdS, time-periodic solutions of vacuum Einstein equations that bifurcate from linear eigenfrequencies of AdS. Interestingly, preliminary results ndicate that the number of time-periodic solutions bifurcating from a given eigenfrequency equals the multiplicity of this eigenfrequency. The talk will be based on the recent preprint https://arxiv.org/abs/1701.07804
Date:	Thu, 23.03.2017
Time:	14:00
Duration:	60 min
Location:	Arbeitsgruppe Gravitation, W�hringer Strasse 17, Raum 218, 2. Stock, 1090 Wien
Contact:	P.T. Chrusciel