E-lab Seminar
Upcoming
| Date | Tue Apr 30 2024 |
|---|---|
| Speaker |
Takahiro Terada (Nagoya Univ.) |
| Title | Probing the early Universe with gravitational waves -- topics on pulsar timing arrays and induced gravitational waves -- |
| Abstract | The detection of gravitational waves (GWs) by the LIGO-Virgo-KAGRA collaboration has opened a new era of GW astronomy, and the evidence of nanohertz GWs found by pulsar timing arrays (PTAs) may be the beginning of GW cosmology. Because of their feeble interactions, GWs emitted in the early Universe can reach us, so they may give us some information about the early Universe, in which new physics beyond the Standard Model of Particle Physics may be relevant. In this talk, we will focus on the secondary GWs induced by primordial curvature perturbations. We discuss their implications for PTAs and primordial black holes. |
| Remarks | |
| Slide/Video |
| Date | Mon May 13 2024 |
|---|---|
| Speaker |
Jonathan Harper (YITP, Kyoto U) |
| Title | TBA |
| Abstract | TBA |
| Remarks | |
| Slide/Video |
| Date | Tue May 28 2024 |
|---|---|
| Speaker |
Pak Hang Chris Lau (Osaka U) |
| Title | TBA |
| Abstract | TBA |
| Remarks | |
| Slide/Video |
| Date | Mon Jun 03 2024 |
|---|---|
| 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. |
| Remarks | |
| Slide/Video |
Past
| Date | Speaker | Title | Slide/Video |
|---|---|---|---|
| 4/23 |
Syuhei Iguro (KMI) |
Recent progress in b->c tau nu | |
| 4/16 |
Hiromi Ebisu (YITP, Kyoto University) |
Fracton topological phases in view of multipole symmetry | |
| 2/27 |
Alessandro Valenti (Basel U.) |
Perturbative running of the topological angles | |
| 2/20 |
Tsunehide Kuroki (Toyota Technological Institute) |
Tensor Network of Kondo Problem and holography ー温故知新ー |
slide1
video1 |
| 2/6 |
Juan William Pedersen (University of Tokyo) |
Quantum Simulation of the Finite Temperature Schwinger Model via Quantum Imaginary Time Evolution | video1 |
| 1/30 |
Kazuki Sakurai (Warsaw University) |
Quantum Information at Colliders | video1 |
| 1/23 |
Yosuke Imamura (Tokyo Institute of Technology) |
Giant Graviton Expansions for Orbifolds and Orientifolds |
slide1
video1 |
| 1/16 |
Yoshihiro Shigekami (Shanghai Jiao Tong University) |
Probing CP Violation in Dark Sector through the Electron Electric Dipole Moment | video1 |
| 1/9 |
Pratik Nandy (Riken) |
Operator growth and Quantum chaos in SYK model | video1 |