ITP OpenIR中国科学院理论物理研究所http://ir.itp.ac.cn/:802020-10-28T00:15:03Z2020-10-28T00:15:03ZWeyl symmetry inspired inflation and dark matterTang, YongWu, Yue-Lianghttp://ir.itp.ac.cn/:80/handle/311006/271312020-06-16T07:50:14Z2020-06-16T07:50:14ZTitle: Weyl symmetry inspired inflation and dark matter
Authors: Tang, Yong; Wu, Yue-Liang
Description: Motivated by the Weyl scaling gauge symmetry, we present a theoretical framework to explain cosmic inflation and dark matter simultaneously. This symmetry has been resurrected in recent attempts to formulate the gauge theory of gravity. We show the inspired inflation model is well consistent with current observations and will be probed further by future experiments. Furthermore, we clarify and prove the stability of Weyl gauge boson in the general theory with multiple scalars. We show the massive Weyl gauge boson can be a dark matter candidate and give the correct relic abundance. (C) 2020 The Author(s). Published by Elsevier B.V.2020-06-16T07:50:14ZVortex lattice in a rotating holographic superfluidXia, Chuan-YinZeng, Hua-BiZhang, Hai-QingNie, Zhang-YuTian, YuLi, Xinhttp://ir.itp.ac.cn/:80/handle/311006/271302020-06-16T07:50:14Z2020-06-16T07:50:14ZTitle: Vortex lattice in a rotating holographic superfluid
Authors: Xia, Chuan-Yin; Zeng, Hua-Bi; Zhang, Hai-Qing; Nie, Zhang-Yu; Tian, Yu; Li, Xin
Description: By utilizing the AdS/CFT correspondence, we explore the dynamics of strongly coupled superfluid vortices in a disk with constant angular velocity at a finite temperature. Each vortex in the vortex lattice is quantized with vorticity n = 1 by the direct inspection of their phases. As the angular velocity of the disk is greater than a critical value, the first vortex will be excited as expected from theoretical predictions. Subsequent vortices are also generated by increasing the rotation of the disk, resulting in remarkable step transitions of the angular velocity which excite each individual vortex. When the vortex number is large enough, the density of vortices is found to be linearly proportional to the angular velocity, which matches the Feynman relation very well. We also find that varying the temperature does not alter this Feynman relation.2020-06-16T07:50:14ZVariation of shear moduli across superconducting phase transitionsLabat, DimitriKotetes, PanagiotisAndersen, Brian M.Paul, Indranilhttp://ir.itp.ac.cn/:80/handle/311006/271292020-06-16T07:50:13Z2020-06-16T07:50:13ZTitle: Variation of shear moduli across superconducting phase transitions
Authors: Labat, Dimitri; Kotetes, Panagiotis; Andersen, Brian M.; Paul, Indranil
Description: We study how shear moduli of a correlated metal change across superconducting phase transitions. Using a microscopic theory we explain why for most classes of superconductors this change is small. The Fe-based and the A15 systems are notable exceptions where the change is boosted by five orders of magnitude. We show that this boost is a consequence of enhanced nematic correlation. The theory explains the unusual temperature dependence of the orthorhombic shear and the back-bending of the nematic transition line in the superconducting phase of the Fe-based systems.2020-06-16T07:50:13ZUnveiling CP property of top-Higgs coupling with graph neural networks at the LHCRen, JieWu, LeiYang, Jin Minhttp://ir.itp.ac.cn/:80/handle/311006/271282020-06-16T07:50:12Z2020-06-16T07:50:12ZTitle: Unveiling CP property of top-Higgs coupling with graph neural networks at the LHC
Authors: Ren, Jie; Wu, Lei; Yang, Jin Min
Description: The top-Higgs coupling plays an important role in particle physics and cosmology. The precision measurements of this coupling can provide an insight to new physics beyond the Standard Model. In this paper, we propose to use Message Passing Neural Network (MPNN) to reveal the CP nature of top-Higgs interaction through semi-leptonic channel pp -> t(-> bl(-) v(l))(t) over bar(->(b) over bar jj)h(-> b (b) over bar). Using the test statistics constructed from the event classification probabilities given by the MPNN, we find that the pure CP-even and CP-odd components can be well distinguished at the LHC, with at most 300 fb(-1) experimental data. (C) 2020 The Authors. Published by Elsevier B.V.2020-06-16T07:50:12ZUnpolarized isovector quark distribution function from lattice QCD: A systematic analysis of renormalization and matchingLiu, Yu-ShengChen, Jiunn-WeiHuo, Yi-KaiJin, LuchangSchlemmer, MaximilianSchaefer, AndreasSun, PengWang, WeiYang, Yi-BoZhang, Jian-HuiZhang, Qi-AnZhang, KuanZhao, Yonghttp://ir.itp.ac.cn/:80/handle/311006/271272020-06-16T07:50:10Z2020-06-16T07:50:10ZTitle: Unpolarized isovector quark distribution function from lattice QCD: A systematic analysis of renormalization and matching
Authors: Liu, Yu-Sheng; Chen, Jiunn-Wei; Huo, Yi-Kai; Jin, Luchang; Schlemmer, Maximilian; Schaefer, Andreas; Sun, Peng; Wang, Wei; Yang, Yi-Bo; Zhang, Jian-Hui; Zhang, Qi-An; Zhang, Kuan; Zhao, Yong
Description: We present a detailed lattice QCD study of the unpolarized isovector quark parton distribution function (PDF) using a large-momentum effective theory framework. We choose a quasi-PDF defined by a spatial correlator which is free from mixing with other operators of the same dimension. In the lattice simulation, we use a Gaussian-momentum-smeared source at M-pi = 356 MeV and P-z is an element of {1.8, 2.3} GeV. To control the systematics associated with the excited states, we explore five different source-sink separations. The nonperturbative renormalization is conducted in a regularization-independent momentum subtraction scheme, and the matching between the renormalized quasi-PDF and (MS) over bar PDF is calculated based on perturbative QCD up to one-loop order. Systematic errors due to renormalization and perturbative matching are also analyzed in detail. Our results for light-cone PDF are in reasonable agreement with the latest phenomenological analysis.2020-06-16T07:50:10ZTwo-loop octagons, algebraic letters and (Q)over-bar equationsHe, SongLi, ZhenjieZhang, Chihttp://ir.itp.ac.cn/:80/handle/311006/271262020-06-16T07:50:09Z2020-06-16T07:50:09ZTitle: Two-loop octagons, algebraic letters and (Q)over-bar equations
Authors: He, Song; Li, Zhenjie; Zhang, Chi
Description: We compute the symbol of the first two-loop amplitudes in planar N = 4 SYM with algebraic letters, the eight-point Next to Maximally Helicity Violating (NMHV) amplitude (or the dual octagon Wilson loops). We show how to apply (Q) over bar equations of [S. Caron-Huot and S. He, J. High Energy Phys. 07 (2012) 174] for computing the differential of two-loop n-point NMHV amplitudes and present the result for n = 8 explicitly. The symbol alphabet for octagon consists of 180 independent rational letters and 18 algebraic ones involving Gram-determinant square roots. We comment on all-loop predictions for final entries and aspects of the result valid for all multiplicities.2020-06-16T07:50:09ZTwo faces of greedy leaf removal procedure on graphsZhao, Jin-HuaZhou, Hai-Junhttp://ir.itp.ac.cn/:80/handle/311006/271252020-06-16T07:50:09Z2020-06-16T07:50:09ZTitle: Two faces of greedy leaf removal procedure on graphs
Authors: Zhao, Jin-Hua; Zhou, Hai-Jun
Description: The greedy leaf removal (GLR) procedure on a graph is an iterative removal of any vertex with degree one (leaf) along with its nearest neighbor (root). Its result has two faces: a residual subgraph as a core, and a set of removed roots. While the emergence of cores on uncorrelated random graphs was solved analytically, a theory for roots is ignored except in the case of Erdos- Renyi random graphs. Here we analytically study roots on random graphs. We further show that, with a simple geometrical interpretation and a concise mean-field theory of the GLR procedure, we reproduce the zero-temperature replica symmetric estimation of relative sizes of both minimal vertex covers and maximum matchings on random graphs with or without cores.2020-06-16T07:50:09ZTriangle singularity in the B--> K- pi X-0 (3872) reaction and sensitivity to the X(3872) massSakai, ShuntaroOset, EulogioGuo, Feng-Kunhttp://ir.itp.ac.cn/:80/handle/311006/271242020-06-16T07:50:08Z2020-06-16T07:50:08ZTitle: Triangle singularity in the B--> K- pi X-0 (3872) reaction and sensitivity to the X(3872) mass
Authors: Sakai, Shuntaro; Oset, Eulogio; Guo, Feng-Kun
Description: We have done a study of the B--> K-pi X-0(3872) reaction by means of a triangle mechanism via the chain of reactions: B--> K-D*(0);(D) over bar*(0); D*(0)-> pi D-0(0); D-0(D) over bar*(0)-> X(3872). We show that this mechanism generates a triangle singularity in the pi X-0(3872) invariant mass for a very narrow window of the X(3872) mass, around the present measured values, and show that the peak positions and the shape of the mass distributions arc sensitive to the X(3872) mass, such that a measurement of the reaction can serve to improve on the present values of this mass. In particular, we point out that the X(3872) mass relative to the D-0(D) over bar*(0) threshold may be extracted from the asymmetry of the pi X-0 line shape.2020-06-16T07:50:08ZTransport performance of coupled Brownian particles in rough ratchetLiu Chen-HaoLiu Tian-YuHuang Ren-ZhongGao Tian-FuShu Yao-Genhttp://ir.itp.ac.cn/:80/handle/311006/271222020-06-16T07:50:07Z2020-06-16T07:50:07ZTitle: Transport performance of coupled Brownian particles in rough ratchet
Authors: Liu Chen-Hao; Liu Tian-Yu; Huang Ren-Zhong; Gao Tian-Fu; Shu Yao-Gen
Description: Molecular motor is a kind of protein macromolecule, which moves along the microfilament or microtubule in cell directionally and participates in all kinds of intracellular life activities fully. In order to study the directional motion of molecular motor, a series of ratchet models have been proposed. However, the potentials used in most of the ratchet models are smooth sawtooth potential or harmonic potential. Recently, the experimental studies show that intracellular impurities, spatial inhomogeneity or the folding process of protein can yield deviation from a smooth ratchet profile. This kind of deviation will roughen the known smooth potential. In fact, the roughness of potential is not only closely related to the properties of protein, but also has an important implication in transition rate. Therefore, the rough ratchet will be used to simulate the interaction between molecular motor and trajectory in this work. In addition, experimental researches show that there is a class of molecular motor that can move directionally without dragging load in organism. According to the theory presented by Wang and Oster (Wang H, Oster G 2002 Europhys. Lett. 57 134), the directional transport capability of this kind of motor can be investigated by means of Stokes efficiency. The higher the Stokes efficiency of the motor, the stronger the ability of the motor to use external input energy for directional motion. Here in this work, the overdamped Brownian transport of the two harmonically interacting particles is investigated, and the performance of transport is analyzed by studying the mean velocity and Stokes efficiency of the dimer induced by the introduction of roughness into the potential profile. The influences of the amplitude of perturbation, the wavenumber, the coupling strength and the free length of coupled Brownian particles on the directional transport performance are discussed in detail. According to the structure of ratchet, it is found that the roughness can either restrain or enhance the ratchet performance. It is shown that the appropriate amplitude and wavenumber of rough ratchet can promote the directional transport and enhance the Stokes efficiency of coupled Brownian particles. Moreover, one can distinguish between the optimal value of the coupling strength and free length that leads to a local maximum current. In addition, the directional transport of rough ratchet can be reversed by modulating the suitable coupling strength and free length. The conclusions obtained in this paper can provide theoretical guidance for understanding the motion behavior of molecular motor in experiment, and can also provide experimental inspiration for developing the nanometer machines and realizing the particle separation technology.2020-06-16T07:50:07ZTrans-Planckian censorship of multistage inflation and dark energyLi, Hao-HaoYe, GenCai, YongPiao, Yun-Songhttp://ir.itp.ac.cn/:80/handle/311006/271212020-06-16T07:50:07Z2020-06-16T07:50:07ZTitle: Trans-Planckian censorship of multistage inflation and dark energy
Authors: Li, Hao-Hao; Ye, Gen; Cai, Yong; Piao, Yun-Song
Description: We explore the bound of the trans-Planckian censorship conjecture on an inflation model with multiple stages. We show that if the first inflationary stage is responsible for the primordial perturbations in the cosmic microwave background window, the e-folding number of each subsequent stage will be bounded by the energy scale of the fast stage. This seems to imply that the lifetime of the current era of accelerated expansion (regarded as one of the multiple inflationary stages) might be a probe for distinguishing inflation from its alternatives. We also present a multistage inflation model in a landscape consisting of anti-dc Sitter vacua separated by potential barriers.2020-06-16T07:50:07Z