# E-lab Seminar

## Upcoming

Date | Tue Apr 16 2024 |
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Speaker |
Hiromi Ebisu (YITP, Kyoto University) |

Title | Fracton topological phases in view of multipole symmetry |

Abstract | Fracton topological phases now have diverse research interests, involving various branches of physics, such as condensed matter physics, and high-energy physics. Distinctive feature of these phases is that mobility constraints are imposed on fractionalized quasi-particle excitations (i.e., anyons), giving rise to sub-extensive ground state degeneracy on a torus geometry. Due to this property, one faces an issue with the UV/IR mixing, implying incapability to resort to preexisting theoretical frameworks, such as topological field theories. In this talk, we discuss a new type of symmetry, which has emerged in the context of the fracton topological phases -- multipole symmetry, associated with conservation of multipoles (e.g, dipole) as well as global charges. We propose BF theories, consisting of gauge fields related to such a symmetry and see how fracton topological phases can be constructed. *This talk is based on recent joint works with M. Honda and T. Nakanishi arXiv:2310.06701 |

Remarks | |

Slide/Video |

Date | Tue Apr 23 2024 |
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Speaker |
Shuhei Iguro (Nagoya U) |

Title | TBA |

Abstract | TBA |

Remarks | |

Slide/Video |

Date | Tue Apr 30 2024 |
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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. |

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Slide/Video |

Date | Mon May 13 2024 |
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Speaker |
Jonathan Harper (YITP, Kyoto U) |

Title | TBA |

Abstract | TBA |

Remarks | |

Slide/Video |

Date | Tue May 28 2024 |
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Speaker |
Pak Hang Chris Lau (Osaka U) |

Title | TBA |

Abstract | TBA |

Remarks | |

Slide/Video |

## Past

Date | Speaker | Title | Slide/Video |
---|---|---|---|

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 |