of the Institute of Theoretical Physics

- February 25, 2014
- (Re)constructing spherically symmetric metrics in general relativity
*Sante Carloni*- ÚTF
- (seminar in Czech language)
- March 4, 2014
- On the existence and properties of helically symmetric systems
*Martin Scholtz*- ÚTF
- (seminar in Czech language)
- March 11, 2014
- Algebraic structure of Kundt geometries in any dimension
*Robert varc*- ÚTF
- (seminar in Czech language)
- March 18, 2014
- Spectral states of active galactic nuclei from simultaneous X-ray and UV measurements by XMM-Newton
*Dr. Jiří Svoboda*- Prague Relativistic Astrophysics Group, Astronomical Institute of the Czech Academy of Sciences
- (seminar in Czech language)
- March 25, 2014
- On non-linear electrodynamics: Einstein, Hoffmann, Born, Infeld, ...
*Dr. Tayebeh Tahamtan*- Department of Physics, Eastern Mediterranean University, North Cyprus
- April 1, 2014
- Geometric methods of constructing generic off-diagonal exact solutions in gravity
*Prof. Sergiu Vacaru*- Alexandru Ioan Cuza University, Iasi, Romania
- April 8, 2014
- The complex morphology of active galactic nuclei: where do we stand ?
*Dr. Frédéric Marin*- Prague Relativistic Astrophysics Group, Astronomical Institute of the Czech Academy of Sciences
- April 29, 2014
- PP-waves as non-Abelian duals of flat metric
*prof. Ladislav Hlavatý*- Department of Physics, FJFI ČVUT
- May 6, 2014
- Kinematical Hilbert space for Einstein-Cartan theory: Continuous tensor product and integral representation of fundamental variables
*dr. Marián Pilc*- UniCredit Bank
- May 13, 2014
- Scalar perturbations in f(R)-cosmology
*Mgr. Jan Novák*- Mathematical Institute, ASCR
- May 20, 2014
- Effects of primordial curvature perturbations on the value of the cosmological constant
*Prof. Antonio Enea Romano*- Group of Phenomenology of Fundamental Interactions, University of Antioquia, Medellín / Yukawa Institute for Theoretical Physics, Kyoto University
- May 27, 2014
- Extended teleparallel gravities: general properties
*Dr. Diego Saez Gomez*- Department of Theoretical Physics and History of Science, Faculty of Science and Technology, University of Basque Country, Bilbao
Teleparallel gravity is a gauge theory for the translation group defined in the tangent bundle of a Riemannian spacetime, where the so-called tetrad plays the role of the dynamical field of the theory and is parallely transported (absolute parallelism condition) by assuming the Weitzenböck connection instead of the Levi-Civita connection, leading to a non-null torsion but a null scalar curvature. Whereas teleparallel gravity is equivalent to general relativity, its extensions, also known as f(T) gravities in analogy to f(R) gravity, give rise to new features and interesting properties but are not equivalent to f(R) gravity. In this talk, I will review some of the last analysis about f(T) gravity, including the violation of the local Lorentz invariance, the construction of conformal invariant actions or the non-existence of extra gravitational wave modes, among other issues.

- June 27, 2014
- !!! MIMOŘÁDNĚ V PÁTEK V 10:00 !!!
- Induced fermionic current in toroidally compactified spacetimes with applications to cylindrical and toroidal nanotubes
*Prof. Stefano Bellucci*- Laboratori Nazionali di Frascati, INFN Roma
- August 12, 2014
- Testing modified gravity in the solar system
*dr. Ali Mozaffari*- Department of Physics, Imperial College London
- August 19, 2014
- Hawking radiation as perceived by different observers
*dr. Luis Barbado*- Institute of Astrophysics of Andalusia (CSIC), Granada
In this talk, I will introduce a method for studying the perception of Hawking radiation by different observers outside a black hole, and for different vacuum states of the radiation field. The analysis is performed in terms of an effective-temperature function that varies along the trajectory of each observer. With this tool, I will show that not all observers crossing the horizon of a black hole in free-fall will fail to detect radiation, and that indeed it is not necessary to strictly form an horizon for obtaining Hawking radiation. Also, the radiation temperature perceived by a generic observer following an arbitrary radial trajectory outside the black hole (when it is possible to talk about a temperature) can be calculated directly from the local characteristics of its trajectory, in a way which has a clear physical interpretation. Finally, our results also point to a self-consistent buoyancy scenario near black holes, due to Hawking radiation.

- August 25, 2014
- !!! on MONDAY at 10:00 !!!
- The (un)bearable lightness of matter-gravity couplings
*dr. Vincenzo Vitagliano*- CENTRA, Instituto Superior Tecnico, Lisboa
I will give a pedagogical review of Metric-Affine theories of Gravity (MAG), theories for which the metric and the affine connection are independent quantities (namely in the Palatini approach) and whose actions include covariant derivatives of the matter fields, with the covariant derivative naturally defined using the independent connection. MAG straightforwardly admit the presence of direct couplings involving matter and connection. I will summarize some physical consequences of such theories.

- August 26, 2014
- Gravitational waves and self-force computation for a compact object around a super-massive black hole
*dr. Patxi Ritter*- Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, CNRS, Orléans
The description of extreme-mass-ratio binary systems is a challenging problem in gravitational wave physics with significant relevance for the future space interferometer eLISA/NGO. The main difficulty lies in the evaluation of the effects of the small body's gravitational field on itself. To that end, an accurate computation of the perturbations produced by the small body with respect to the background geometry of the large object (a massive black-hole) is required. After a presentation of the theoretical perturbative framework for EMRIs, I will present a numerical procedure to generate EMRI wave-forms and compute the self-force in the Regge-Wheeler gauge.

- September 9, 2014
- Black hole chemistry
*dr. David Kubizňák*- Perimeter Institute for Theoretical Physics, Waterloo, Ontario
- (seminar in Czech language)
The mass of a black hole has traditionally been identified with its energy. We describe a new perspective on black hole thermodynamics, one that identifies the mass of a black hole with chemical enthalpy, and the cosmological constant as thermodynamic pressure. This leads to an understanding of black holes from the viewpoint of chemistry, in terms of concepts such as Van der Waals fluids, reentrant phase transitions, triple points, and isolated critical point. Both charged and rotating black holes exhibit novel chemical-type phase behaviour, hitherto unseen.

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© December 15, 2014; Oldřich Semerák

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