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입자이론물리 그룹에서 KIAS의 박미옥 박사님과 서강대학교 양현석 교수님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.


Date/time: 2018. 12. 21(Fri.) 15:00


Place: Room number 31317


Speaker: Dr. Miok Park (KIAS)


Title: Quasilocal Smarr Relations


Abstract:  A quasilocal Smarr relation is obtained from Euler’s theorem for n-dimensional
asymptotically flat spacetimes and it is checked through several examples by calculating
quasilocal variables using the Brown-York quasilocal formalism, along with Mann-Marolf
counterterms. To find the entropy in the quasilocal frame, we define a quasilocal free energy from the Euclidean gravity action with a Tolman temperature. We discovered that the quasilocal free energy definition is not altered by a surface pressure term, and the entropy obtained through this method agrees with the usual Bekenstein-Hawking entropy. We also check that the quasilocal free energy combined with the quasilocal Euclidean action value is consistent with our quasilocal Smarr relation.


Date/time: 2018. 12. 21(Fri.) 16:30


Place: Room number 31317


Speaker: Prof. Hyun Seok Yang (Sogang University)


Title: Expanding Universe and Dynamical Compactification Using Yang-Mills Instantons


Abstract:  We consider an eight-dimensional Einstein-Yang-Mills theory to explore whether Yang-Mills instantons formed in extra dimensions can induce the dynamical instability of our four-dimensional spacetime. We show that the Yang-Mills instantons in extra dimensions can trigger the expansion of our universe in four-dimensional spacetime as well as the dynamical compactification of extra dimensions. We also discuss a possibility to realize a reheating mechanism via the quantum back-reaction from the contracting tiny internal space with a smeared instanton.


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