Title: Beyond Einstein? What black holes and cosmology tell us?

Speaker: Prof.Bum-Hoon Lee(韩国西江大学)

  Bum-Hoon Lee(李範勷)教授于1989年在美国哥伦比亚大学获得博士学位，随后任韩国汉阳大学和西江大学教授。2005年至2014年，他推动了量子时空中心(CQUeST)的建设，并担任中心首位主任。2015年起，先后任韩国高能物理理事会和亚太理论物理中心(APCTP)主席、韩国物理学会(KPS)会长等职。荣获2023年韩国物理学会SungBong奖，2022年保障研究伦理贡献部长奖，2022年总统奖章，2012年促进基础研究贡献部长奖。担任多个国际物理期刊的编辑。论文引用超过3000次，H指数头32,研究方向包括引力、宇宙学和弦理论。

Abstract:

Is Einstein's theory of gravity and the standard cosmological model fullysatisfactory? Despite their significant achievements, theoretical argumentssuggest possible modifications to Einstein's gravity. Recent observations revealincdiscrepancies in the measurement of the Hubble constant, along with the effectsof cosmic birefringence, suggest the potential need for theories beyond Einstein'sframework, particularly those involving higher curvature scenarios. We introducedilaton-Einstein-Gauss-Bonnet (dEGB) gravity in four dimensions as a simpleextension of general relativity, Black holes, which are essential for quiding ustowards the quantum domain, will be explored through their thermodynamicproperties, particularly via holographic methods. Unlike Einstein's gravity, dEGBgravity imposes a minimum mass threshold for black hole formation. Incosmology, we summarize the evolution of the universe according to the standardmodel and highlight new features of dEGB cosmology, including a novel phasethat emerges at higher temperatures and its physical implications.

2025-05-21, 16:30

物理学院322