Date:  1st Dec. 2022, 10:00am

Speaker: Yawen Sun (孙雅文）

Affiliation: UCAS 

Tencent/VooV Meeting ID: 973-6909-6865

Online Meeting Link: https://meeting.tencent.com/dm/ZGVDkboF0pFP

Abstract:

In this talk I will show that gapless modes in relativistic hydrodynamics could become topologically nontrivial by weakly breaking the conservation of energy momentum tensor in a specific way. One possible origin for the non-conservation terms of the energy momentum tensor is an external gravitational field which could be generated by a specific coordinate transformation from the flat spacetime. This suggests that topologically trivial modes could become topologically nontrivial by being observed in a special non-inertial reference frame. A holographic realization of this system will be introduced, which is further confirmed by matching the Ward identities and hydrodynamic modes of both sides. This observation is also generalized to fermionic systems, where a topologically nontrivial Weyl semimetal could be observed from a trivial Dirac fermion by a special elastic accelerating observer.

Introduction of Speaker:

孙雅文，本科毕业于中国科学技术大学，2010年于中科院理论物理研究所取得物理博士学位。先后在莱顿大学、西班牙国家科学院理论物理所从事博士后研究工作，2015-06~2017-09西班牙国家科学院理论物理所玛丽居里学者。现就职于中国科学院大学。研究领域为高能理论物理，引力，弦论，黑洞物理，引力/规范对偶。