8 августа в 11:00 в зале заседаний (2 этаж) Института физики состоится научный семинар на тему: «Black Holes in Quantum Gravity»
Докладчик: Kellog Stelle, Professor of Physics, Imperial College, Faculty of Natural Sciences, Department of Physics, London.
Язык семинара: английский
Анонс:
Einstein’s general relativity theory of gravity is now brilliantly passing all observational and experimental tests to which it has been subjected. However, at it’s basis there is a fundamental contradiction: it displays a deep incompatibility with the quantum theory, the other revolutionary development of 20th century physics. A key problem is its uncontrollable behavior in the ultraviolet, i.e. at infinitesimally short distances. While a final resolution to this essential problem of quantized gravity has not yet been reached, some aspects of the resulting effective theory can nonetheless be explored. In a Feynman diagram loop expansion, the first quantum corrections involve terms in the gravitational action which are quadratic in the Riemann curvature tensor. About these, there is good news and bad news. The good news is that if one steps back and includes such terms in the gravitational action, the quantum theory is stabilized in the proliferation of ultraviolet divergences which plagues the classical Einstein theory. The bad news is that new, quantum, instabilities appear in the ultraviolet. Regardless of the ultimate resolution of this ultraviolet problem, one may still see what properties such a quantum corrected theory may have in the infrared, i.e. larger or intermediate distances. Here some interesting things happen, in particular with “classical” solutions to the quantum corrected effective theory. New types of black hole and also non black hole solutions appear, unknown in Einstein theory. The talk will give an overview of such new phenomena and their possible relation to stability properties of small black holes.