[ 素粒子論セミナー ]

Implications of anomaly-free axion for Higgs bosons in 3HDM

講演者

Kodai Sakurai (Tohoku U.)

日時

2022年5月24日(火)15:40-16:40

場所

H701

概要

クリックして概要を表示・非表示

Axion (or axion-like particle) is a prominent candidate of light dark matter (DM). It emerged as the pseudo Nambu-Goldstone boson originated from the breaking of global U(1) symmetry. If the mass scale is keV, axion usually suffers from the severe constraint from the X-ray bounds. However, a fascinating axion, which can evade such a severe constraint, was proposed as an anomaly-free axion. In this talk, I will discuss a three Higgs doublet model (3HDM) as a UV complete model where the anomaly-free axion is embodied. I will show the synergy between the anomaly-free axion and the heavy Higgs bosons predicted in this concrete model.

南部コロキウム

概要

半定期的に開催

詳しくはこちら


これまでに開催したセミナー

スクールの案内


これまでに開催したスクール

これまでの開催情報

セミナー

[ 素粒子論セミナー ]

Symmetry Protected Topological Criticality

講演者

Linhao Li (Tokyo U.)

日時

2022年5月10日(火)15:40-16:40

場所

Online (D501)

概要

クリックして概要を表示・非表示

Symmetry protected topological (SPT) phases are one of the simplest, yet nontrivial, gapped systems that go beyond the Landau paradigm. In this work, we study the notion of SPT for critical systems, namely, symmetry protected topological criticality (SPTC). We discuss a systematic way of constructing a large class of SPTCs using decorated defect construction, study the physical observables that characterize the nontrivial topological signatures of SPTCs, and discuss the stability under symmetric perturbations. Our exploration of SPTC is mainly based on several previous studies of gapless SPT: gapless symmetry protected topological order, symmetry enriched quantum criticality and intrinsically gapless topological phases. We partially reinterpret these previous studies in terms of decorated defect construction, and discuss their generalizations.

[ 素粒子論セミナー ]

CFT duals of three-dimensional de Sitter gravity

講演者

Tatsuma Nishioka (Osaka U.)

日時

2022年4月26日(火)15:40-16:40

場所

H701

概要

クリックして概要を表示・非表示

We present a class of dS/CFT correspondence between two-dimensional CFTs and three-dimensional de Sitter spaces. We argue that such a CFT includes an SU(2) WZW model in the critical level limit k → −2, which corresponds to the classical gravity limit. We can generalize this dS/CFT by considering the SU(N) WZW model in the critical level limit k →−N, dual to the higher spin gravity on a three-dimensional de Sitter space. We confirm that under this proposed duality the classical partition function in the gravity side can be reproduced from CFT calculations.

[ 素粒子論セミナー ]

Some phenomenological aspects of 2HDM

講演者

Tanmoy Mondal (Osaka U.)

日時

2022年4月19日(火)15:40-16:40

場所

H701

概要

クリックして概要を表示・非表示

I will talk about some phenomenological aspects of the two Higgs doublet model(2HDM). The 2HDM can explain the muon anomalous magnetic moment with a light pseudoscalar. I will discuss the prospect of discovering such particles at the lepton collider like ILC. Then I will discuss how an extension of 2HDM can connect neutrino mass and muon anomalous magnetic moment.

[ 原子核実験セミナー ]

Nuclear Incompressibility: 
How Collective Excitation Modes of a Nucleus Characterize Astrophysical Processes

講演者

Dr. Umesh Garg
(Professor, Department of Physics, University of Notre Dame)

日時

2022年2月3日(木)11:15-12:45

場所

オンライン

概要

クリックして概要を表示・非表示

The Nuclear Incompressibility parameter is one of three important components characterizing the nuclear equation of state (EOS). It has crucial bearing on diverse nuclear and astrophysical phenomena, including radii of neutron stars, strength of supernova collapse, emission of neutrinos in supernova explosions, and collective flow in medium- and high-energy nuclear collisions. In this talk I will review current status of the research on direct experimental determination of nuclear incompressibility via the compressional-mode giant resonances. In particular, measurements on a series of Sn and Cd isotopes have provided an "experimental" value for the asymmetry term of the nuclear incompressibility; this term is important for the EOS of neutron stars. We also find that the GMR centroid energies of the in both Sn and Cd isotopes are significantly lower than the theoretical predictions, pointing to the possible role of superfluidity in nuclear incompressibility.
----------
IPC intensive lecture will be also given online by Prof. Umesh Garg during Feb 1-4.
----------
問い合わせ先:川畑 貴裕 (理学研究科物理学専攻)

スクール

高エネルギー物理春の学校

2015年6月10-12日

物理院生春の学校

2015年3月9-11日

ICEPPシンポジウム

2015年2月8-11日