2020-07-13
(月) 初期宇宙・相対論速報UTAPwiki/セミナー/初期宇宙・相対論速報
Thermodynamical interpretation for the second law of Cosmology †
↑Ido Ben-Dayan †
The area of a future holographic screen increases monotonically. Associating this area with entropy results in a generalized second law for Cosmology (GSLC). Unlike black hole horizons, screens relevant to Cosmology have no thermodynamical interpretation.
Past efforts have tried to express thermodynamical quantities related to gravity in terms of phase space variables and microstates. Such phase space constructions of black holes and accelerated observers have been carried out. We will utilize this notion for holographic screens.
Relating the entropy of the screens to spacetime degrees of freedom surface density derived from a phase space enables us to identify the entropy of any holographic screen as the entropy detected by accelerating observers due to their acceleration. Using Unruh's temperature and the equivalence principle, this gives the holographic screens' temperature and yields a thermodynamical interpretation of the GSLC.
2020-07-13
(月) 観測的宇宙論速報
2020-07-16
(木) 宇宙物理学セミナーUTAPwiki/セミナー/宇宙物理学セミナー
Speaker: Yusuke Yamada
Title: Quantum tunneling and related phenomena
Abstract:
Quantum tunneling is a hallmark of nonclassical physics. Such a phenomenon is relevant to microscopic physics to cosmology. In this talk, I will briefly review examples of tunneling phenomena mostly in cosmology. In tunneling phenomena, the notion of decay rate of a state is one of the most important quantities. I will review how the decay rate is precisely defined and computed in a modern way. For simplicity, I will discuss it in quantum mechanics, but the formulation is straightforwardly applied to quantum field theory as well.
I will discuss several topics, but the topic discussed in detail is based on the following paper : A. Andreassen, D. Farhi, W. Frost, M. D. Schwartz, Phys.Rev.D 95 (2017) 8, 085011
※Notice: This is scheduled to be the last seminar in this semester.
2020-07-20
(月) 初期宇宙・相対論速報UTAPwiki/セミナー/初期宇宙・相対論速報
†
↑Soichiro Hashiba †
2020-07-20
(月) 観測的宇宙論速報
担当者：Hajime Fukushima (Tsukuba)
内容：添付ファイル [添付] 参照
Author(s)TitleYear, Journal,Number(,Link)Y. SutoJinsei Ippan ni Sotairon2010, ISBN978-4-13-063354-3
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