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【01.15】Seminar:Cosmological Stasis: Theoretical Overview, Model Realizations, and Phenomenological Implications
文章來源:  2025-01-13
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Seminar
報(bào)告題目:Cosmological Stasis: Theoretical Overview, Model Realizations, and Phenomenological Implications?
報(bào)告人:黃飛,?博士后,魏茨曼科學(xué)研究所
主持人:巖斌,副研究員,中國科學(xué)院高能物理研究所
報(bào)告時(shí)間:2025年1月15日(周三),下午15:00
報(bào)告地點(diǎn):圖書館樓319會議室
報(bào)告摘要

Many theories of physics beyond the Standard Model give rise to a surprising phenomenon known as cosmological stasis, in which the abundances of different energy components such as matter, radiation, and vacuum energy remain constant across extended cosmological epochs, even though the universe is expanding. Interestingly, we find that stasis is actually a global dynamical attractor toward which the universe necessarily evolves whenever certain basic conditions are satisfied. As a result, an epoch of cosmological stasis is a common and potentially unavoidable feature within the expansion histories associated with many scenarios for physics beyond the Standard-Model. In this talk, I will provide a theoretical overview of the stasis phenomenon and discuss some of its implications and applications. I will also examine two particular model realizations of stasis: one involves the evaporation of a population of primordial black holes with an extended mass spectrum; the other involves a collection of scalar fields, sequentially undergoing transitions from overdamped to underdamped motion. As we shall see, these realizations of stasis not only emerge naturally within top-down scenarios for new physics, but may also have a number of phenomenological implications, including effects on inflationary observables and modifications to the spectrum of the stochastic gravitational-wave background. They may also potentially serve as the basis for a novel framework for realizing cosmic inflation.

個(gè)人簡介

黃飛,2019年在亞利桑那大學(xué)獲得博士學(xué)位,2019-2022年在加州大學(xué)爾灣分校和中科院理論所擔(dān)任聯(lián)合博士后,目前為魏茨曼科學(xué)研究所博士后。主要從事高能物理唯象學(xué)研究,重點(diǎn)關(guān)注暗物質(zhì)理論和早期宇宙演化。



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