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Silk damping in scalar-induced gravitational waves: a novel probe for new physics

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 79-85页

作者： Yan-Heng Yu Sai Wang theoretical Physics division Institute of High Energy Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences

Silk damping is well known in the study of cosmic microwave background（CMB） and accounts for suppression of the angular power spectrum of CMB on large angular multipoles. In this article, we study the effect of Silk damping on the scalar-induced gravitational waves（SIGWs）. Resulting from the dissipation of cosmic fluid, the Silk damping notably suppresses the energydensity spectrum of SIGWs on scales comparable to a diffusion scale at the decoupling time of weakly-interacting particles. The effect offers a novel observable for probing the underlying particle interaction, especially for those mediated by heavy gauge bosons beyond the standard model of particles. We anticipate that pulsar timing arrays are sensitive to gauge bosons with mass ～10～3-10～4 GeV, while space-and ground-based interferometers to those with mass ～10～7-1012GeV, leading to essential complements to on-going and future experiments of high-energy physics.

关键词： scalar-induced gravitational waves Silk damping new physics

Schamel equation in an inhomogeneous magnetized sheared flow plasma with q-nonextensive trapped electrons

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Chinese Physics B 2018年第2期27卷 428-434页

作者： Shaukat Ali Shan Qamar-ul-Haque theoretical Physics division (TPD) PINSTECH

An investigation is carried out for understanding the properties of ion–acoustic（IA） solitary waves in an inhomogeneous magnetized electron-ion plasma with field-aligned sheared flow under the impact of q-nonextensive trapped electrons. The Schamel equation and its stationary solution in the form of solitary waves are obtained for this inhomogeneous plasma. It is shown that the amplitude of IA solitary waves increases with higher trapping efficiency（β）, while the width remains almost the same. Further, it is found that the amplitude of the solitary waves decreases with enhanced normalized drift speed, shear flow parameter and the population of the energetic particles. The size of the nonlinear solitary structures is calculated to be a few hundred meters and it is pointed out that the present results are useful to understand the solar wind plasma.

关键词： sheared flow plasma density inhomogeniety electron trapping

Damped electrostatic ion acoustic solitary wave structures in quantum plasmas with Bohm potential and spin effects

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Chinese Physics B 2019年第1期28卷 460-465页

作者： S Hussain H Hasnain Mahnaz Q.Haseeb theoretical Physics division(TPD) Department of Physics COMSATS University

Nonlinear properties of ion acoustic solitary waves are studied in the case of dense magnetized plasmas. The degenerate electrons with relative density effects from their spin states in the same direction and from equally probable up and down spinning states are taken up separately. Quantum statistical as well as quantum tunneling effects for both types of electrons are taken. The ions have large inertia and are considered classically, whereas the electrons are degenerate. The collisions of ions and electrons with neutral atoms are considered. We derive the deformed Korteweg de–Vries(DKdV)equation for small amplitude electrostatic potential disturbances by employing the reductive perturbation technique. The Runge–Kutta method is applied to solve numerically the DKdV equation. The analytical solution of DKdV is also presented with time dependence. We discuss the profiles for velocity, amplitude, and time variations in solitons for the cases when all the electrons are spinning in the same direction and for the case when there is equal probability of electrons having spin up and spin down. We have found that the wave is unstable because of the collisions between neutral gas molecules and the charged plasmas particles in the presence of degenerate electrons.

关键词： degenerate plasma collisions spin-up spin-down

Magnetosonic Shocks in Ultra-Relativistic Dissipative Degenerate Plasmas

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Chinese Physics Letters 2016年第8期33卷 77-80页

作者： S.Hussain N.Akhtar N.Mustafa theoretical Physics division PINSTECHP.O.Nilore

Magnetosonic shock structures in dissipative magnetized degenerate electron ion plasma are studied. The two fluid quantum magnetohydrodynamic equations for non-degenerate ions and ultra-relativistic degenerate electron fluids with the Maxwell equations are presented. Using the reductive perturbation technique the Korteweg de Vries Burgers （KdVB） equation is derived and its solution is presented with the tanh method. Astrophysical plasma parameters are used to study the effects of variation of plasma density, magnetic field intensity and kinematic viscosity on the propagation characteristics of nonlinear shock structures in such plasma systems.

关键词： in on is et de of that

Detecting Quantumness in the n-cycle Exclusivity Graphs

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Chinese Physics Letters 2019年第8期36卷 19-22页

作者： Jie Zhou Hui-Xian Meng Jing-Ling Chen theoretical Physics division Chern Institute of Mathematics Nankai University

Quantum contextuality is one kind of quantumness that distinguishes quantum mechanics from classical *** the simplest exclusivity graph,quantum contextuality of the n-cycle graph has been reviewed,while only for odd n the quantumness can be *** by this,we propose the degree of non-commutativity and the degree of uncertainty to measure the quantumness in the n-cycle *** desired,these two measures can detect the quantumness of any n-cycle graph when n≥4.

关键词： Quantum Graphs cycle

Connecting Quantum Contextuality and Genuine Multipartite Nonlocality with the Quantumness Witness

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Chinese Physics Letters 2016年第1期33卷 6-9页

作者：陈旭苏洪轶陈景灵 theoretical Physics division Chern Institute of MathematicsNankai University

The Clauser Horne--Shimony-Holt-type noncontextuality inequality and the Svetliehny inequality are derived from the Alicki-van Ryn quantumness witness. Thus connections between quantumness and quantum contextuality, a... 详细信息

关键词： that or of on from it is Connecting Quantum Contextuality and Genuine Multipartite Nonlocality with the Quantumness Witness have with form been

Nonlocality Distillation and Trivial Communication Complexity for High-Dimensional Systems

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Chinese Physics Letters 2016年第8期33卷 5-9页

作者：李艳叶向军陈景灵 theoretical Physics division Chern Institute of MathematicsNankai University

A nonlocality distillation protocol for arbitrary high-dimensional systems is proposed. We study the nonlocality distillation in the 2-input d-output bi-partite case. Firstly, we give the one-parameter nonlocal boxes and their correlated distilling protocol. Then, we generalize the one-parameter nonlocality distillation protocol to the twoparameter case. Furthermore, we introduce a contracting protocol testifying that the 2-input d-output nonlocal boxes make communication complexity trivial.

关键词： for on of it in Nonlocality Distillation and Trivial Communication Complexity for High-Dimensional Systems is

Aharonov-Anandan Phases in Lipkin-Meskov-Glick Model

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Communications in theoretical Physics 2011年第8期56卷 247-252页

作者：杨大宝陈景灵 theoretical Physics division Chern Institute of MathematicsNankai University

In the system of several interacting spins,geometric phases have been researched ***,the studies are mainly focused on the adiabatic case (Berry phase),so it is necessary for us to study the non-adiabaticcounterpart (Aharonov and Anandan phase).In this paper,we analyze both the non-degenerate and degenerate geometricphase of Lipkin-Meskov-Glick type model,which has many application in Bose-Einstein condensates and ***,in order to calculate degenerate geometric phases,the Floquet theorem and decomposition ofoperator are *** the general formula is achieved.

关键词： geometric phase spin chain models calculations for few-body systems

Coarse-grained description of q-deformation top and t-j model

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Science China Mathematics 1998年第4期41卷 422-430页

作者：陈景灵王宙斐葛墨林薛康 theoretical Physical division Nankai Institute of Mathematics Tianjin China

From RTT relations the integrable Hamiltonian of the trigonometric Goryachev\|Chaplygin gyrostat is established, which can be reduced to the Hamiltonian of t\|j model by using multi\|fermion realization of \%SU\-q(2)\... 详细信息

关键词： coarse\|grained description t\|j model \%G\|C\% top.