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Calendar of Physics Talks Vienna
| Entanglement between matrix degrees of freedom and QFT counterpart of entanglement island |
| Speaker: | Masanori Hanada (Department of Mathematic, University of Surrey, GB) |
| Abstract: | In gauge/gravity duality, matrix degrees of freedom on the QFT side play important roles for the emergent geometry.In this talk,we discuss how the entanglement in the gravity side can be described as the entanglement between matrix degrees of freedom.Our approach is different from 'target-space entanglement'which was proposed recently by several groups.The examples studied include the evaporation of small black hole, to which our approach provides a natural QFT counterpart of the entanglement island behind the horizon.Specifically,we propose
that the confined degrees of freedom in the partially-deconfined states are the counterpart of the island.Intuitively,the confined sector consists of D-branes sitting behind the horizon and sourcing the exterior geometry.In the context of ER=EPR conjecture,they play the role of Einstein-Rosen bridge.Our proposal applies to the standard gauge/gravity |
| Date: | Tue, 25.01.2022 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Zoom https://univienna.zoom.us/j/3378250147?pwd=T2h2YWJCQ3M2V1AyaDFkT3h4NmR1dz09 ID Meeting: 337 825 0147 Passcode: 475496 |
| Contact: | D. Grumiller, S. Fredenhagen, E. Battista, R. Ruzziconi |
| Thomas angle via Clifford Algebra |
| Speaker: | Helmut Urbantke (Univ. Wien) |
| Abstract: | In this seminar, I derive McFarlane's formula for the Thomas Angle appearing in boost o boost = boost o rotation using Clifford Algebra.
To do this, I first remind how to generate boosts and rotations from reflections. The composition of the latter becomes particularly easy using Clifford(-Dirac) algebra.
Time permitting, I will illustrate the geometry of the situation in relativistic velocity space = hyperbolic 3-space, allowing to identify the Thomas angle with the defect of a geodesic triangle in that space. |
| Date: | Thu, 27.01.2022 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | ZOOM https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09 |
| Contact: | P. Chrusciel, D. Fajman |
| How to Make Lead look like Gold and Decoherence-Free Entropic Gravity: Model and Experimental Tests |
| Speaker: | Denys Bondar (Tulane University) |
| Abstract: | In this talk, I will attempt to cover two seemingly unrelated topics. Yet, the key is that they are related, as will be explained.
Recently, we theoretically unveiled an unexplored flexibility of nonlinear optics that a shaped laser pulse can drive a quantum system to emit light as if it were an arbitrary different system. This realizes an aspect of the alchemist’s dream to make different elements look alike, albeit for the duration of a laser pulse. To understand this methodology, we need to define what “looking alike” means. One visually perceives a physical system due to a difference between light before (i.e., the optical input) and after (i.e., the optical response) interacting with the system of interest. Thus, to make two different systems look alike is equivalent to be able to match their optical responses. This finding has received broad public coverage in such scientific outl |
| Date: | Fri, 28.01.2022 |
| Time: | 16:00 |
| Duration: | 45 min |
| Location: | https://tuwien.zoom.us/j/99712909944?pwd=dmlybGJYa2tTUWdFQlNNRmJ6YWx3dz09 |
| Contact: | Hartmut Abele |
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