讲座预告|8月26日-30日

报告人

章颖理/Ying-li Zhang (同济大学)

报告时间

2024年8月26日 14:30

报告地点

理论物理所 南楼6620

Primordial black holes (PBHs) are a kind of black holes which may form during the primordial epoch of the universe. In this talk, I will discuss two different mechanisms of formation of PBHs (namely PBHs from enhancement of primordial curvature perturbations, and PBHs from the collapse of bubbles) in double-field inflationary models. 

章颖理研究员于2013年在日本京都大学取得博士学位，导师为Misao Sasaki。之后分别于京都大学基础物理学研究所（YITP）、中国科学院国家天文台国家天文台、英国朴茨茅斯大学引力与宇宙学研究所（ICG）、东京理科大学、东京工业大学从事博士后研究员工作。2020年入职同济大学任特聘研究员。2024年担任中国科学院理论物理研究所彭桓武青年研究员。他的研究方向为理论宇宙学，研究课题主要包括暴胀模型、原初黑洞与修正引力理论。

Microwave-shielding has proven to be a powerful technique for producing degenerate quantum gases of polar molecules as well as assembling ultracold polyatomic molecules. Here, I will review our efforts in controlling the interactions of ultracold molecules using microwave fields, enabling us to stabilize the molecular gases and evaporate them to temperatures well below the Fermi temperature. The shape, symmetry, and depth of the intermolecular potential can be flexibly controlled by the polarization, strength, and frequency of the microwave field. This is a unique feature of microwave-shielded polar molecules that is distinguished from ultracold atoms. It allows us to observe field-linked resonances in collisions of polar molecules, providing a universal tool for independently controlling the dipolar and contact interactions of molecules, as well as creating exotic long-range tetratomic molecules. In the end, I will discuss the perspectives of a p-wave superfluid of dimers and its crossover to a Bose-Einstein condensate of tetramers.

Xin-Yu Luo is an independent research group leader at the Max-Planck-Institute for Quantum Optics. He has been focusing on experiments of quantum manipulation and precision measurements with ultracold atoms and polar molecules. His current research interest is to understand and control the collisions of ultracold polar molecules and, subsequently, investigate strongly interacting dipolar quantum many-body systems.

I will present the latest calculation of HVP contributions to muon anomaly with Lattice QCD from Budapest-Marseille-Wuppertal collaboration (BMWc). The result leads to a prediction 714.1(2.2)(2.5)[3.3]x10-10 that differs from the experimental measurement of a_μ by only 0.9 standard deviations. This provides a remarkable validation of the standard model to 0.37 ppm. Since the largest systematic uncertainty comes from the ratio between the intrinsic QCD scale and fermion masses, we measure the precise Ω baryon mass in lattice units at seven lattice spacings down to a=0.048 fm with N_f=2+1+1 staggered quarks, including QED and strong-isospin corrections. We perform these measurements by solving the Generalized Eigenvalue Problem, adapted to staggered fermions to fully resolve the negative parity and excited states. The most precise intrinsic QCD scale parameter  w_0=0.17245(22)(46)[51] fm in the continuum limit at physical quark masses is determined using the physical Ω baryon mass, with unprecedented 0.3 percent precision.

Dr. Gen Wang graduated from University of Kentucky, US and current postdoc at Aix Marseille University, France under Budapest-Marseille-Wuppertal collaboration. His main research interest is on high-precision lattice calculation of the hadron structure, such as muon anomalous magnetic moment, proton spin decompositions and standard model parameter determinations.