Уважаемые коллеги!
Очередной семинар ФФ состоится
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Во вторник, 1 декабря 2020, в 18:10 (Nsk time), удаленно с помощью
системы Zoom.
Адрес для подключения к видеоконференции.
https://zoom.us/j/95201892381Идентификатор конференции: 952 0189 2381
Будут представлены три 20 мин доклада аспирантов ФФ.
1. "Inner tracker for Super Charm-Tau Factory detector"
Докладчик: аспирант НГУ Vijayanand Kuttikattu Vadakepattu
Аннотация:
At present, the Budker Institute of nuclear physics is developing a Super
Charm-Tau factory with high luminosity and a universal detector. The
tracking system of the detector comprises an Inner tracker and Drift
chamber. Here I present the different candidates for the Inner tracker and
progress on their simulation and prototyping studies.
2. "On deformations of classical mechanics due to Planck-scale physics"
Докладчик: аспирант НГУ Abhijit Sen
Аннотация:
Expected modifications of quantum canonical commutation relations due to
quantum-gravity effects near the plank scale are well known. The
corresponding modifications in classical mechanics is usually done by
modifying the Poisson's brackets. In this talk, we point out that there is
an interesting alternative opportunity. Koopman-Von Neumann's Hilbert
space formulation of classical mechanics allows, as Sudarshan noted, to
consider the classical mechanics as a hidden variable quantum system (that
is, a quantum system in which some quantum variables are hidden for
classical observers - this is opposite to the usual hidden variable
theories there the hidden variables are classical). The Planck scale
modification of this encompassing quantum system naturally induces the
corresponding modification of dynamics in the classical substrate and in
fact destroys classicality.
3. "Parameters of lognormal mass spectrum of Primordial Black Holes (PBH)"
Докладчик: аспирант НГУ SHILADITYA POREY
Primordial Black Holes (PBHs) are considered a viable candidate for the
dark matter mystery. Although PBHs were formed at the very early epoch of
the evolutionary history of the universe, they can be formed following
various mechanisms. In their paper [Dolgov & Silk, 1993
[journals.aps.org]] Prof. Dolgov with Prof. Silk proposed a mechanism of
PBHs formation where they showed that the initial mass spectrum of those
must be of the lognormal form. With the supposition that all of the
supermassive black holes in the contemporary universe are primordial ones
and the number density of galaxies is equal to the number density of
intermediate-mass black holes, we tried to estimate the parameters of that
lognormal mass spectrum at the present time. It was found in our other
paper that the mass distribution of the coalescing black holes, registered
through gravitational waves by LIGO interferometer, is indeed of lognormal
form with the peak at 17 solar masses, which is close to that obtained in
our first work. Such value of the central mass was predicted theoretically
by Prof. Dolgov and Prof. Postnov [arXiv:2004.11669 [arxiv.org]].
Comparison of the mass distribution of black holes analyzed in our paper
with that based on the assumption of their astrophysical origin strongly
disfavors the latter. So the primordial origin of the LIGO black holes
remains probably the only viable option.
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Пожалуйста, ваши предложения по докладам на семинаре присылайте по
e-mail или сообщайте по телефону Шварцу Борису Альбертовичу,
shwartz@inp.nsk.su, тел.: 329 4376, моб.: 913 929 3361
С уважением, Б.Шварц.
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