E-lab Seminar
Upcoming
| Date | Mon May 13 2024 |
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| Speaker |
Jonathan Harper (YITP, Kyoto U) |
| Title | Multi-trace measure in AdS3/CFT2 |
| Abstract | The multi-trace generalizes the trace of many copies of the reduced density matrix of a quantum state by considering tensor contractions of the various parties with respect to a general finite symmetry group. Analogous to the entanglement entropy, the multi-trace can then be used to define "multi-trace measures", potential measures of multi-party entanglement. I will highlight how this structure allows for an equivalent geometric description in terms of q-point functions of twist operators for 2d CFTs and provide several examples. For a static time slice of AdS3 I will describe a particular class of minimal surfaces which form trivalent networks of geodesics and through geometric arguments provide evidence that these surfaces describe a measure of multipartite entanglement. By relating these surfaces to Ryu-Takayanagi surfaces I will show that this multipartite contribution is related to the angles of intersection of the bulk geodesics. A proposed boundary dual, the multi-entropy, is an example of such a multi-trace measure. Throughout the talk I will emphasize several related mathematical frameworks including: Riemann surfaces, handlebody orbifolds, and semi-classical Liouville theory. |
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| Slide/Video |
| Date | Tue May 21 2024 |
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| Speaker |
Adil Jueid (IBS) |
| Title | New Physics Searches at Future Muon Colliders |
| Abstract | In this talk I will discuss the potential of future multi-TeV muon colliders in finding new physics. First, I will show some comparative order of magnitude estimates of different indicators for particle production muon colliders. I will then briefly discuss the challenges we may encounter in physics analyses. Finally, I will discuss in detail some new physics cases focusing mostly on neutrino mass and dark matter models. |
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| Slide/Video |
| Date | Tue May 28 2024 |
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| Speaker |
Pak Hang Chris Lau (Osaka U) |
| Title | TBA |
| Abstract | TBA |
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| Slide/Video |
| Date | Mon Jun 03 2024 |
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| Speaker |
Takashi Hiramatsu (Rikkyo University) |
| Title | Dynamical simulations of colliding superconducting strings |
| Abstract | I am going to talk about the numerical results of the collisions of elastic superconducting strings, also referred to as current-carrying strings, formed in a U(1)_local x U(1)_global field-theory model, reported in our recent paper arXiv:2312.16091. The breaking of U(1)_local leads to string formation via the Higgs mechanism, while the scalar field of the second U(1)_global carries the current, which condenses onto the string. We construct straight and static superconducting string solutions numerically and identify the regions in which they exist in the model parameter space. Using our field-theoretic simulation code, we then perform dynamical simulations for colliding superconducting strings with various collision angles and collision velocities. We then find that the outcome of the collision process can be classified into four categories: (i) regular intercommutation, (ii) double intercommutation, (iii) bound state, and (iv) expanding string solution, which is summarised diagramatically in the parameter space of the collision velocity and angle. The numerical experiments in the present study have some implications for future work on the time evolution of cosmic superconducting string networks. The impact of such strings on cosmology and astrophysics will also be discussed. |
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