Talk detail

Participant	Flambaum, Victor
Institution	University of New South Wales - - Sydney - - Australia

Session	EG2	Accepted	Yes	Order	4	Time	15' + 3'
Talk	Oral abstract	Title	Astrophysical evidences for the variation of fundamental constants and proposals of laboratory tests.
Co-authors
Abstract	There are new results for the variation of the fine structure constant alpha, based on the quasar absorption spectra data. These results indicate the variation of alpha in space. The spatial variation can explain fine tuning of the fundamental constants which allows humans (and any life) to appear. We appeared in the area of the Universe where the values of the fundamental constants are consistent with our existence. There is an agreement between the results obtained using different telescopes and different redshifts. Also, now there are no contradiactions between the results obtained by different groups. These astrophysical results may be used to predict the variation effects for atomic clocks which are very small and require improvement of the sensitivity by 1-2 orders of magnitude. This improvement may be achieved using 229Th nuclear clocks where the effect of the variation is hugely enhanced. There are also enhanced effects in multiply charged ions, and certain atomic and molecular transitions.

Session	BH3	Accepted	Yes	Order	2	Time	10'
Talk	Oral abstract	Title	Quantum effects around gravitating bodies: narrow resonances and black hole absorption properties without an event horizon
Co-authors	J.C.Berengut, G.H.Gossel, G.F. Gribakin, Y. Stadnik
Abstract	We investigate quantum properties of particles in the gravitational fields of near black-hole object of radius R that slightly exceeds the Schwarzschild radius Rs. Quantum particles scattered by the gravitational field of such an object possess a dense spectrum of narrow resonances whose lifetimes and density tend to infinity in the black-hole limit. The cross section of particle capture into these resonances is equal to the absorption cross section for a black hole; thus, a non-singular static metric acquires black-hole properties before the actual formation of a black hole [1]. Additionally we examine the Schwarzschild interior metric which develops a pressure singularity before R = Rs (at R=9Rs/8). Narrow resonances still occur in the scattering problem, but the absorption vanishes at zero-energy scattering (in contrast to the black hole case). The absorption cross-section is finite for non-zero energy particles [1]. [1] V. V. Flambaum, G. H. Gossel, and G. F. Gribakin, accepted to Phys. Rev. D (2012), arXiv:1012.2134.