Toru Kojo, KEK
[KEK-JAEA Joint Seminar] A quarkyonic matter model for dense QCD and hyperon problems
Hybrid On-site: Room 116, KEK Tokai campus Online: Zoom
Recent neutron star observations combined with the nuclear constraints suggest that QCD matter quickly stiffens at density close to nuclear matter density. We argue that the stiffening is triggered by a transition from nuclear to quark matter. The concept of quarkyonic matter captures relevant features necessary to understand the stiffening. We present an ideal model of quarkyonic matter and apply it to isospin symmetric and a matter of neutral baryons including the strangeness. We argue how the quark description mitigates the hyperon problems in neutron star constraints.
榎戸輝揚, 京都大学理学研究科/理化学研究所開拓研究本部
[金茶会] 宇宙放射線から切り拓く学際研究：高エネルギー大気物理学から月面物理学へ
4号館セミナーホール リモート会場：東海1号館115室、仁科記念棟106室 https://www-conf.kek.jp/kincha/
https://www-conf.kek.jp/kincha/
Ｘ線天文学を始めとする宇宙放射線の測定は、王道の高エネルギー天文学だけではなく、多様な学際研究を生み出している。たとえば、小型の放射線モニタを用いて、雷や雷雲からのガンマ線を測定することで、雷での光核反応の発見、雷雲での粒子加速機構の解明、雷のトリガーの謎などを扱う高エネルギー大気物理学が勃興している。これをシチズンサイエンスで推進すると同時に、放射線の多地点観測を月で展開し、月の水資源を探索する「MoMoTarO (Moon Moisture Targeting Observatory)」を開始した。月面に叩き込まれる銀河宇宙線は、月の表面で高速中性子を発生する。この中性子が表面から漏出する際に、水が存在すると効率よく運動エネルギーを失い、熱・熱外中性子として表面から漏出してくる。月面ローバーに搭載した中性子モニタで水資源を探すとともに、月周回機に搭載すれば中性子の寿命を測定でき、宇宙遠方からのガンマ線バーストを測定すれば、重力波宇宙論にも貢献することができる。宇宙放射線の視点で展開する多様な学際研究を紹介したい。
Muping Chen, WPI-QUP, KEK
Halo-Independent Analysis of Light Dark Matter Direct Detection
Hybrid On-site: Kenkyu honkan, Seminar room Online: Zoom We demonstrate how the HI analysis can be applied to sub-GeV DM scattering off electrons for noble gas targets such as Xe and
We demonstrate how the HI analysis can be applied to sub-GeV DM scattering off electrons for noble gas targets such as Xe and
semiconductor targets such as Ge and Si. In the HI analysis method, properties of the local DM halo velocity distribution are inferred from direct DM detection data, which allows the comparison of different data sets without making any assumption on the uncertain local dark halo characteristics. This method had previously been developed for and applied only to DM scattering off nuclei. We additionally show that in-medium effects could significantly affect HI analysis results for semiconductor targets Ge and Si and thus are essential for proper inference of local DM halo characteristics from direct DM detection data.
Soichiro Shimamori, Osaka University
Non-invertible duality defect and fusion algebras in conformal field theories
Hybrid On-site: Kenkyu honkan, Seminar room Online: Zoom We study non-invertible duality symmetries by gauging a diagonal subgroup of a non-anomalous U(1) × U(1) global symmetry. In
We study non-invertible duality symmetries by gauging a diagonal subgroup of a non-anomalous U(1) × U(1) global symmetry. In
particular, we employ the half-space gauging to c=2 bosonic torus conformal field theory (CFT) in two dimensions and pure U(1) × U(1) gauge theory in four dimensions. In c=2 bosonic torus CFT, we show that the non-invertible symmetry obtained from the diagonal gauging becomes emergent on an irrational CFT point. We also calculate the fusion rules concerning the duality defect. We find out that the fusion algebra is non-commutative. We also obtain a similar result in pure U(1) × U(1) gauge theory in four dimensions. This presentation is based on the joint work with Yuta Nagoya [arXiv: 2309.05294, hep-th] .
西内満美子, QST関西量子科学研究所
[金茶会] レーザー駆動イオン加速研究−小型のイオン加速器実現に向けて
4号館セミナーホール リモート会場：JRB2階大会議室、仁科記念棟106室 https://www-conf.kek.jp/kincha/
https://www-conf.kek.jp/kincha/
高強度レーザーと物質との相互作用により生成される相対論的プラズマは、高エネルギー粒子の発生源として認識されてから四半世紀が経とうとしている。発生するイオンビームの特徴が既存加速器からのイオンビームの特徴と異なるため、小型の加速器を含む、様々な応用先が提唱されてきており、それに向けたビームの良質化の研究が世界において精力的に行われている。本講演では、このレーザー駆動イオン加速研究に関し、歴史、背景、世界的な動向、最先端研究についてご紹介する。
Sean Hartnoll, Cambridge University
The polarised IKKT model
Online (Zoom)
The IKKT matrix model provides a holographic framework in which all spacetime dimensions are emergent. It remains poorly understood, not least because the ’timeless’ nature of the model means that the standard renormalisation group interpretation of the emergent ‘ radial’ dimension is not immediately applicable. I will discuss a supersymmetric deformation of the IKKT integral that gives a practical handle on the model. I will show how well-established phenomena, including brane polarisation in the presence of background fluxes, arise in this context and thereby allow the rudiments of a holographic dictionary to be established.
J. Richard Bond, Canadian Institute for Theoretical Astrophysics, University of Toronto
[KEK-Cosmo special colloquium] Entropy in a Coherent Universe: Quantum Information in the Action of the Cosmic SuperWeb
Seminar room, 3 go-kan
von Neumann of (thermal) quantum entropy fame purportedly responded to Shannon asking what his novel classical information content measure should be called: paraphrasing, entropy, nobody understands it anyway. Nowadays information entropy and thermal entropy have merged as ideas, and expanded to encompass phase info as well as counting info, aka quantum information. Its development and transport through all of the great cosmic epochs of instability accompanying transitions of phase is a unifying story of the Universe. This is a big topic which I will meander through, from the speculative emergence of coherence, through an inflation era, its preheating end in the matter-entropy burst, with attention on the cosmic neutrino background decoupling, cosmic photon thermal decoupling and its Compton scattering decoupling, and entropy development and transport in the gravitationally-unstable nonlinear cosmic web. With applications to observable entropic relics and the cosmic parameters we derive from them, such as the CnuB, CMB, the cosmic infrared background, line intensity mapping, and the thermal state of clusters, groups and the IGM. Whew, and that’s not all: one quest is for information-laden Planck-epoch non- Gaussianities, scalar and tensor, beyond Planck the satellite, and towards LiteBird.
Tomoya Kinugawa, Shinshu University
Gravitational waves from first star remnants
Hybrid On-site: Seminar room, Kenkyu honkan 3F Online: Zoom
We calculated binary evolutions of first stars (Pop III) and showed that the typical chirp mass of Pop III binary black holes is ∼30Msun with a total mass of ∼60Msun and the maximum mass of Pop III BBH is more massive than the limit mass of the pair instability supernovae. Our result, which predicted gravitational wave events like GW150914 and GW190521, can explain the origin of massive stellar binary black hole mergers. In this talk, I will explain Pop III binary evolutions and the properties of Pop III binary black hole mergers. There is a good chance to check indirectly the existence of Pop III massive stars by gravitational waves.
Yu Hamada, DESY
Gravitational wave from current-carrying domain walls
Hybrid On-site: Seminar room, Kenkyu honkan 3F Online: Zoom
Domain walls (DWs) are very common objects that appear in many BSM models with spontaneous breaking of discrete symmetries and have been widely studied in the context of gravitational wave observation. Depending on models, DWs can contain internal degrees of freedom such as fermionic zeromodes (like DW fermion in lattice QCD) or bosonic zeromodes. Such an object is called current-carrying DW as it can carry (dark) electric charge/current. In this talk, we will show gravitational wave spectrum radiated from current-carrying DWs can be quite different from conventional DWs. Particularly they can enhance UV regime of spectrum, increasing the detectability by future gravitational wave instruments.
宮原正也, KEK素核研・QUP
[金茶会] 半導体の技術トレンドと物理実験用ASIC開発
つくば：4号館セミナーホール リモート会場：AQBRC２階会議室、仁科記念棟106室 https://www-conf.kek.jp/kincha/
