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Xuan Yang (purple mountain observatory)10/12/2021, 10:20
We have searched for weak fast radio burst (FRB) events using a database containing 568,736,756 transient events detected using the Parkes radio telescope between 1997 and 2001. In order to classify these pulses, and to identify likely FRB candidates, we used a machine learning algorithm based on ResNet. We identified 81 new candidate FRBs and provide details of their positions, event times,...
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TianLe Zhao (University of Science and Technology of China)10/12/2021, 10:40
We study the small scale magnetic reconnection above the radiative inefficient accretion flow around massive black hole via 2D magnetohydrodynamics (MHD) numerical simulation, in order to model the blob formation and ejection from the accretion flow around Sgr A*. The connection of both the newly emerging magnetic field and the pre-existing magnetic field is investigated to check whether blobs...
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Ms Guangxuan Lan (PMO)10/12/2021, 11:00
Gamma-ray bursts (GRBs) are the most luminous explosive transients in the cosmos. Generally, long GRBs (LGRBs) with durations $T_{90}$>2s are believed to be powered by the core collapse of massive stars then thus suggested to be excellent tools to probe the star formation rate (SFR) at high redshifts. However, base on the studies over the last two decades, there is a general agreement on the...
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Ms Zeyang Sun (SJTU)10/12/2021, 11:20
We measure the cross-correlation between galaxy groups constructed from DESI Legacy Imaging Survey DR8 (Yang et al. 2021) and Planck CMB lensing, over overlapping sky area of 16876 deg2. The detections are significant and consistent with the expected signal of the large scale structure of the universe, over group samples of various redshift, mass and richness Ng and over various scale cuts....
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Mr Yu Liu (Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai)10/12/2021, 11:40
Plenty of crucial information about our Universe is encoded in the cosmic large-scale structure (LSS). However, the extractions of these information are usually hindered by the nonlinearities of the LSS, which can be largely alleviated by various techniques known as the reconstruction. In realistic applications, the efficiencies of these methods are always degraded by many limiting factors, a...
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Jiming Yu10/12/2021, 14:00
The discovery of gravitational-wave (GW) signals, produced by the coalescence of stellar-mass binary black holes (SBBHs), opens a new window to study the astrophysical origins and dynamical evolutions of compact binaries. In addition, these GW events can be treated as the standard sirens to constrain various cosmological parameters. Both issues require the host identification for these GW...
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Dr Ziwen Zhang (University of Science and Technology of China)10/12/2021, 14:20
Based on the spectroscopic and shear catalogs for SDSS galaxies in the local Universe, we compare optically-selected active galactic nuclei (AGNs) with control star-forming and quiescent galaxies on galactic, inter-halo and larger scales. We find that AGNs are preferentially found in two specific stages of galaxy evolution: star-burst and `green valley' phases, and that the stellar population...
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Wenke Ren (University of Science and Technology of China)10/12/2021, 14:40
本次报告中我将介绍近期我们从SDSS DR14 quasar catalog中构建出的，目前为止最大的一批极端光变类星体(EVQs)样本，包括其搜寻方法、物理性质和相关物理过程的探讨。EVQs被认为是用来研究变脸(changing-look)类星体以及类星体点燃和熄灭过程(turn on/off)比较理想的样本，对这种传统模型难以解释的短时标大幅度光变源的研究也可以加深我们对星系核活动相关物理过程的认识。因此我们近期从SDSS DR14Q出发结合PAN-STARRS数据，通过谨慎的筛选，找到了14,012个类星体样本，并根据其光谱观测时的高低态进行了分类叠加，分析了不同状态下EVQs与对照组在连续谱和宽发射线上的区别。此外我们还将简要介绍目前针对该样本中个源的研究进展和计划。
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Yunfeng Wei (Xiamen University)10/12/2021, 15:00
Fallback in core-collapse supernovae (CCSNe) plays an important role in determining the properties of the central compact remnants, which might produce a black hole (BH) hyperaccretion system in the centre of a massive CCSN. When the accretion
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rate is extremely high and neutrino cooling is dominant, the hyperaccretion should be in the phase of the neutrino-dominated accretion flows (NDAFs),... -
Mr Lei Zu (purple mountain observatory)10/12/2021, 15:20
Recently, the XENON1T experiments has reported the possible detection of an excess in the electronic recoil spectrum. We use mirror DM and plasma DM model to explain this excess and predict the possible signal in the future nuclear direct detection.
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Danning Liu (TDLI)10/12/2021, 15:40
Di-boson process is one important test of the Standard Model Electroweak Symmetry Breaking, and also
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backgrounds for many new physics searches. The study shows the simulation and precise measurement of di-boson
process in pp collisions at s = 13TeV, using a full dataset corresponding to an integrated luminosity of 139 fb−1
recorded with the ATLAS detector at the LHC. Di-boson process is also... -
Xiaoyu Wang (USTC)10/12/2021, 15:40
Using two sets of large $N$-body simulations, we studied the origins of the correlations between halo assembly time ($z_{\rm f}$), concentration ($v_{\rm max}/v_{\rm 200}$), and spin ($\lambda$) with the large-scale evolved density field at given halo mass, namely, the secondary bias. We find that the secondary bias is a secondary effect resulting from the correlations of halo properties with...
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Mr Yanfeng Hang10/12/2021, 15:40
The scattering amplitudes of massive Kaluza-Klein (KK) states of open and closed bosonic strings play an important role in studying the duality between the gauge and gravity theories. We analyze the structure of vertex operators for the KK strings and derive an extended massive KLT-like relation which connects the $N$-point KK closed-string amplitude to the products of two KK open-string...
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Mr Zhen Wang (TDLI)10/12/2021, 15:40
This study has finished the implementation of NN pixel Clustering algorithm of Athena release 22 in the ATLAS Inner Detector Trigger analysis framework for the b-jet signature. An improvement in the tracking efficiency is observed in release 22 offline tracking. The study also helps to improve the tracking efficiency by modifying the truth level tracking information.
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Mr Fei He (SJTU)10/12/2021, 15:40
In the scanning probe microscope system, the weak signal detection of cantilever vibration is one of the important factors affecting the sensor sensitivity. In our current work, we present a novel design concept for an atomic force microscope (AFM) combined with optomechanics with an ultra-high quality factor and a low thermal noise. The detection system consists of a fixed mirror placed on...
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Yuchen Ding (Shanghai astronomical observatory)10/12/2021, 15:40
We probe the effect of cluster environment to the star formation quenching in galactic thin disks for 18 galaxies (17 early-type, 1 late-type) in the Fornax cluster. High quality data resolving the kinematical and chemical information across the observational plane are obtained through IFU observations with MUSE/VLT. We create population-orbit superposition models to each galaxy, the model...
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Qibin LIU10/12/2021, 15:40
The identification of massive particles decaying into bottom quark pairs is important for the physics program of the ATLAS experiment at the Large Hadron Collider. A neural network (NN) based double b-tagging algorithm named 𝑋→𝑏𝑏 ̅ tagger is developed and calibrations of the tagger are performed using proton-proton collision data corresponding to 139/𝑓𝑏 collected at a centre-of-mass energy of...
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Mr Xiaoyu Chen (Nanjing University)10/12/2021, 15:40
We perform scanning tunneling microscopy/spectroscopy (STM/STS) study on the layered iron based superconductor KCa2Fe4As4F2 with a critical temperature of about 33.5 K. The commonly obtained surface shows full-gap feature with energy gap values close to 4.6 meV. This type of spectrum presents a uniform full gap in space indicating the absence of gap nodes in this superconductor. Quasiparticle...
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Shicong Hu (Institute of High Energy Physics, Chinese Academy of Sciences)10/12/2021, 15:40
Very high energy (VHE,>100 GeV) gamma-rays open a crucial window to explore the "non-thermal Universe". High-sensitivity, unbiased surveys of the gamma-ray sky are important to find new astrophysical objects - both to understand their bulk properties, and to constrain new physics beyond the standard model. Up to now, more than 230 sources are detected mainly by IACT (like Whipple, HESS, MAGIC...
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Ms Tianye Xia (1Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University )10/12/2021, 15:40
Invariant curves are generally closed curves in the Poincare ́ surface of section. Here we study an interesting dynamical phenomenon, first discovered by Binney (1985) in a rotating Kepler potential, where an invariant curve of the surface of section can split into two disconnected line segments under certain conditions, which is distinctively different from the islands of resonant orbits. We...
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Dr Qing Li (Nanjing university)10/12/2021, 15:40
最近，有研究者在几种镍氧化物薄膜 R1-xAxNiO2 (R = La, Pr, Nd; A = Ca, Sr) 中发现了约 5-15 K 的超导电性，这引起了超导和材料相关领域的极大关注。由于其母相 RNiO2 中Ni的 3d9 核外电子排布与铜基高温超导母体极其相似，因此人们认为这两类材料中的超导电性可能具有相同的起源。我们利用高温高压和低温软化学还原相结合的三步合成方法，成功制备了块材 Nd1−xSrxNiO2 (x = 0, 0.2,...
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Dr Ying Xiang (Nanjing University)10/12/2021, 15:40
过渡金属化合物中，因为电荷、自旋、晶格、轨道等自由度之间的相互作用，很多有序态之间具有相似的能量。其中有个常见的态是电子向列相，它的出现破坏了晶体的面内旋转对称性，并经常和其他态共存、互相影响、合作或竞争。而具有kagome晶格的材料包含丰富的奇异电子特性，比如自旋液体、电荷密度波、超导和拓扑态等。最近，新的拓扑kagome金属家族AV3Sb5 (A = K, Rb, or Cs) 被发现，并迅速引起了广泛关注。我们在CsV3Sb5单晶的面内旋转磁场并测量c方向的电阻率，观测到c方向的电阻率无论在超导态还是正常态都具有二度旋转对称性，并且超导态和正常态对应曲线的极值角度方向相互垂直。我们的研究结果为理解CsV3Sb5特殊的物理性质提供了新的思路。
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Mr Guan-Wen Yuan (Purple Mountain Observatory)10/12/2021, 16:40
Dense dark matter is predicted around super-massive black hole (SMBH). Recently, the Event Horizon Telescope and GRAVITY groups, which focus on M87* and Galactic Center, have published their observations, which provide us a good chance to search dark matter.
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Mr Rui Niu (School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei 230026, China)10/12/2021, 17:00
With the continuous upgrade of detectors, more and more gravitational wave (GW) events were captured by the LIGO Scientific Collaboration and Virgo Collaboration (LVC), which offers a new avenue to test General Relativity and explore the nature of gravity. Although, various model-independent tests have been performed by LVC in previous works, it is still interesting to ask what constraints on...
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Chun Huang (Central China Normal University)10/12/2021, 17:20
Link(1992) considered the newly-developed observation could be a strong evidence for external torque interpretation of persistent offset, developed by Ruderman(1991), We conclude in this talk that after 30 years of accumulation of observation data volume, new observational evidence has in turn been able to rule out the external torque explanation in favor of the internal mechanism associated...
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Dr weitao Lv (doctoral students)10/12/2021, 17:40
Microwave Kinetic Inductance Detectors(MKIDs) are very promising superconducting detector arrays used in the field of terahertz astronomy. It has attracted much attention due to its simple implementation of frequency-multiplexing readout technology. The Purple Mountain Observatory(PMO) of the Chinese Academy of Sciences has carried out related research on the MKIDs detector based on the...
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Danying Yu (Shanghai Jiao Tong University)11/12/2021, 09:00
Characterization the equilibrium topological invariants through the dynamics quench process attracts extensive interests very recently. Usually, the characterization of non-equilibrium topological invariants shown during the dynamics quench requires information in both the time and spatial dimensions. We propose the topological holographic quench dynamics in synthetic dimension to characterize...
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Mr 瀚 肖 (上海交通大学)11/12/2021, 09:20
在原子—波导系统中研究光与原子相互作用，有益于在量子信息处理中实现光子传输的灵活操控。近年来，利用量子超导电路平台，人们制备了与波导多点发生耦合的人工巨原子，为波导光子与原子相互作用搭建了多路径的量子干涉通道。耦合腔波导不同于连续波导，人们将动态调制源应用到腔与腔的连接处，可以进一步操控光子的空间分布和频谱分布。我们从理论上探究了，光子在动态调制的耦合腔波导中与二能级巨原子相互作用后的传输特性。研究发现，在特定的参数选择下光子被局域在耦合点附近的谐振腔中，同时被激发的原子表现出亚辐射衰变的特性[arXiv:2111.06764]。为了解释这一光子束缚态的现象，我们提出了基于动量空间的模式分离近似方法，解析表明，初始处于传输态的入射光子被转换到局域态是由波导光子与巨原子相互作用中多路径的量子干涉效应做导致的。此外，我们研究的实空间模型也可以拓展到合成频率维度，利用电光调制器动态调制谐振...
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Mr Siyuan Wan (National Laboratory of Solid State Microstructures and Department of Physics, Center for Superconducting Physics and Materials, Collaborative Innovation Center for Advanced Microstructures, Nanjing University, Nanjing China)11/12/2021, 09:40
在铜氧化物超导体中，由于电子的强关联特性，有许多与超导态共存或者与超导竞争的序。它们中反铁磁序是其中最主要的一个。往往在相图中超导出现的区域长程反铁磁已经被破坏了，但在高掺杂下会出现剩下的短程反铁磁涨落。它们在超导态中所扮演的角色仍然被高度的关注。这里我们利用自旋极化的扫描隧道显微镜，第一次直接观测到在掺杂进最佳掺杂的Bi2Sr2CaCu2O8+δ的Fe原子附近的一个非公度反铁磁序。Fe杂质压制了超导能隙结构中相干峰的强度，破坏了超导相干，但也将短程的非公度反铁磁序钉扎下来。我们的工作揭示了超导与反铁磁的密切关系，为理解高温超导与反铁磁的相互作用与高温超导配对提供了新的认识。
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Dr Xiaoxiang Zhou (Nanjing University)11/12/2021, 10:00
近期新发现的Kagome金属家族AV3Sb5 (A = K, Rb, or Cs)展现出电荷密度波、超导电性以及拓扑非平庸的Dirac能带, 迅速引起凝聚态物理学界的广泛关注，其中电荷密度波的驱动机制及其与超导电性的关系是当前该领域争论的焦点。我们利用红外光谱对CsV3Sb5中的电荷密度波进行了研究。结果显示，在TCDW=91...
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Mr Jiahao Yang (Tsung-Dao Lee Institute)11/12/2021, 10:30
There has been considerable recent progress in identifying candidate materials for the transverse-field Ising chain (TFIC), a paradigmatic model for quantum criticality. Here, we study the local spin dynamical structure factor of different spin components in the quantum disordered region of the TFIC. We show that the low-frequency local dynamics of the spins in the Ising- and transverse-field...
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Xiao Wang (Tsung-Dao Lee Institute)11/12/2021, 10:50
The transverse field Ising chain (TFIC) at its quantum critical point (QCP) in the scaling limit turns to be a central charge 1/2 conformal field theory (CFT). In the vicinity of a small longitudinal magnetic field, eight quasiparticles emerge and the whole system can be described by exceptional $E_{8}$ Lie algebra. This excitation essentially arises from weak confinement due to the...
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Dr 绍峰 段11/12/2021, 11:10
强激光与多体系统相互作用可以诱导非平衡态的新奇物理现象，例如光致超导、光致亚稳态、光激发相干声子模式和光致拓扑缺陷的产生等。激光脉冲泵浦激发固体材料中的电子提供了一种通过非热方式诱导新颖量子态产生的手段，可以在飞秒至皮秒级的时间尺度上操控材料的宏观属性。最近我们的研究发现，利用飞秒激光可以部分翻转三维电荷密度波材料中的周期性晶格扰动，实现瞬时的二维长程有序电子态，这些研究使得激光对量子材料的操控成为当前的研究热点。相应的电子和晶格动力学可以分别由时间分辨角分辨光电子能谱（trARPES）和超快电子衍射（UED）探测。更有趣的是，光诱导的二维电子态的表面有能隙的打开，这可能是光致非平衡态超导的迹象。利用超快激光调制原子的移动是一种实现二维电子态的新方法，并将成为在量子材料中创造新物质相的新方法。
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Yuanyuan Yang11/12/2021, 11:30
铁基超导体是第二大类高温超导材料，其具备丰富的相图，通过改变压力或者施加磁场的方式可以实现不同量子相之间的转变。向列相相变是铁基超导体中备受关注的话题，即在发生温度变化时，伴随着高温四方相向低温正交相的晶格结构的相变，电子结构会发生面内的对称性破缺。利用时间分辨角分辨光电子能谱（trARPES）技术，可以直接的对铁基超导体中电子向列相的起源以及与超导相之间的关联进行探索，进一步理解铁基超导体中高温超导的配对机制。FeSe是晶格结构最简单的铁基超导体，其超导转变温度Tc~8 K，向列相转变温度Ts~90 K,且并没有伴随着磁结构的相变，为探究纯的电子向列相与超导相之间的关联提供了独一无二平台。本研究利用trARPES对FeSe中具备不同轨道特征的能带，在激光泵浦之下的超快演变过程进行了探测。我们发现在超快激光泵浦作用下，...
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Jia-Zheng Ma (Sun-Yat sen University)11/12/2021, 11:50
TBG and moire system have attracted huge interest in both experimantal and theoretical community due to its exotic strong correlated properties and rich phase diagram. However there is still lack of a general theory for arbitrary twisted angle without commensurate approximation. And the superconductive pairing mechanism in TBG is still controversial.
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We propose a new kind of geometric theory... -
Mr Jin Sun (TDLI, SJTU)11/12/2021, 14:00
When the Standard Model Higgs sector is extended with a complex singlet that breaks global lepton number symmetry spontaneously, a massless Goldstone boson called the Majoron $J$ arises. In addition to increasing Higgs invisible decay through mixing, the Majoron can generally have flavor-changing interactions with fermions.
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We find that type-III seesaw model poses such interesting properties... -
Yanjie Zeng (Institute of Theoretical Physics, Chinese Academy of Sciences)11/12/2021, 14:20
We explore the applications of a network of vector sensors, sensitive to certain spatial components of the signals, in identifying the property of light axion or dark photon background. These bosonic fields contribute to vector-like signals in the detectors, including effective magnetic fields triggering the spin precession, effective electric currents in a shielded room, and forces on the...
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Mr Zhou Huang (Shanghai Jiao Tong University)11/12/2021, 14:40
The PandaX-4T experiment will utilize a two-phase liquid/gas xenon time projection chamber to search dark matter. The PandaX-4T is located in the Hall B2 of the Jinping Underground Laboratory with 2400 m overburden. In the commissioning run, 1058 candidate events are identified with 3.7-tonne of liquid xenon target and an exposure of 0.63 tonne·year. A stringent limit to the dark...
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bingzhi li11/12/2021, 15:00
费米实验室的缪子g-2实验对缪子的反常磁矩进行了精确的测量，首批物理结果现已公布。最新的实验结果表明缪子反常磁矩的理论预言与实验测量之间存在4.2σ的偏差，为新物理的存在提供了强有力的证据，预示着世界上可能存在新的未知粒子或者作用力。
缪子反常磁矩由两个角频率的精确测量确定。实验中，缪子受强磁场束缚在储存环内运动，通过统计缪子衰变产生的高能电子数目得到缪子的反常进动频率ω_a。利用脉冲核磁共振技术，测量质子的自旋进动频率ω_p表征强磁场的大小。结合上述两个频率以及缪子在储存环中的分布函数和其他已知常数可以精确的测量缪子的反常磁矩。首批物理结果的测量精度达到了0.46ppm，后继测量结果的精度将进一步提高，预计于2022年发布。
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Lining Mao11/12/2021, 15:30
The uniformity of the gas flow in the chamber and the deformation of the electrode plates are critical to the performance of RPC (Resistance Plate Chamber). In this talk, a new design of RPC with “shifted” spacer configuration and less spacer number is come up. The different behaviors of the flow field, electrode’s deformation and electric field between RPCs with new spacer configuration and...
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Mr Qiuping SHEN (Shanghai Jiao Tong University)11/12/2021, 15:50
Semi-Digital Hadron Calorimeter (SDHCAL) prototype for CEPC is a PFA-based hadron calorimeter that has shown good energy and position resolution with a CERN test beam. Considering the signal time of hadronic shower formed by neutrons is delayed, compared with that from charged hadrons, high-precision time measurement, requiring at least 100ps orders, helps improve separation between
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neutrons... -
Mr Zong Yaoyao11/12/2021, 16:10
原子核的质量是核物理中最基本的物理量之一，原子核质量的预言在核物理以及核天体领域中具有广泛且重要的应用。镜像核质量公式基于同位旋对称性和库仑相互作用，对丰质子区原子核质量进行精确描述，公式的精度达到 110–130 keV。通过奇偶性分组拟合和残差关联效应，质量公式的精度进一步降低到 50–90 keV。通过使用镜像核质量公式，可以对丰质子区原子核的质量进行预言，预言值和最新实验数据精确吻合。
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Mr Min-Huan Chu (Shanghai Jiao Tong University)11/12/2021, 16:30
In this work we present the analysis of Collins-Soper kernel extracted from pion transverse momentum dependent wave functions in the framework of large momentum effective theory from lattice QCD. We use clover fermion action with $2 + 1 + 1$ flavors of highly improved staggered quarks (HISQ), with lattice spacing $a=0.12$fm and volume $L^3\times T=48^3\times64$. The results are obtained based...
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