报告题目：From Entanglement Entropy & Swampland Bounds to TTbardeformations
报告地点：吉林大学前卫校区物理楼302，在线报告（ZOOMID： 829 6003 8091 Passcode: 369963）
报告摘要：We investigate entanglement entropies in thecontext of the DS/dS correspondence. Interestingly, we find that there exists aone parameter family of bulk minimal surfaces that all have the same area. Wealso show that in the presence of extra matter fields the former entanglemententropy always exceeds the dS entropy. We interpret this result in the contextof entropy bounds in de Sitter space and the swampland program.
Furthermore, we consider the entanglement entropies in(A)dS(d+1) in the presence of a hard radial cutoff and compute the entanglemententropy for generic intervals on the cutoff slice analytically and interpretthem in terms of TTbar deformations. Surprisingly, we find that we may writethe entanglement entropies formally in the same way as the entanglement entropyfor antipodal points on the sphere by introducing an effective radiusReff=Rcos(βϵ).Geometrically, this is equivalent to following the TTbar trajectory until thegeneric interval corresponds to antipodal points on the sphere. Finally, wematch the entanglement entropies for antipodal points explicitly on the fieldtheory and gravitational side by considering the Wald entropies.
报告人简介：Sebastian Grieninger obtained his PhD in 2020from the Friedrich-Schiller University of Jena, Germany under the supervisionof Prof. Martin Ammon. During his PhD, he was granted a Fulbright scholarshipto visit the University of Washington, Seattle (USA) for 19 months. At theUniversity of Washington he was working under the supervision of Prof. AndreasKarch on quantum information theoretic aspects of Holography in particular onentanglement entropies and swampland bounds in context of the so-called DS/dScorrespondence and T\bar T deformations. In his Master and PhD thesis, heinvestigated the far- and close-to-equilibrium effects of chiral anomalies and(spontaneously) broken spacetime symmetries on the transport behavior ofstrongly coupled field theories. After his PhD, he was granted a DAADscholarship to join the group of Prof. Anton Rebhan at the Vienna University ofTechnology in Austria for 6 months. As of November 2020, he is a PostdoctoralResearcher in the group of Prof. Karl Landsteiner and Dr. Daniel Areán at theInstitute for Theoretical Physics at the Universidad Autónoma de Madrid/CSIC inSpain.