检索结果-南通市图书馆

Prospects for statistical tests of strong-field quantum electrodynamics with high-intensity lasers

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2023年第6期11卷 7-15页

作者： C.Olofsson A.Gonoskov Department of Physics University of GothenburgGothenburgSweden

Exploiting high-energy electron beams colliding into high-intensity laser pulses brings an opportunity to reach high values of the dimensionless rest-frame acceleration χ and thereby invoke processes described by strong-field quantum electrodynamics(SFQED).Measuring deviations from the results of Furry-picture perturbation theory in SFQED at high χ can be valuable for testing existing predictions,as well as for guiding further theoretical developments.Nevertheless,such experimental measurements are challenging due to the probabilistic nature of the interaction processes,dominating signals of low-χ interactions and limited capabilities to control and measure the alignment and synchronization in such collision experiments.Here we elaborate a methodology of using approximate Bayesian computations for drawing statistical inferences based on the results of many repeated experiments despite partially unknown collision parameters that vary between experiments.As a proof-of-principle,we consider the problem of inferring the effective mass change due to coupling with the strong-field environment.

关键词： Bayesian inference strong-field quantum electrodynamics laser accelerator

electrodynamics in Curvilinear Coordinates and the Equation of a Geodesic Line

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Physics 2022年第11期13卷 1382-1402页

作者： Anatoly V. Parfyonov Ulyanovsk State Technical University Ulyanovsk Russia

The creation of the theory of relativity, which discovered the equivalence of mass and energy, showed that the concept of a point charge, used in the formulation of Coulomb’s law, one of the basic laws of classical electrodynamics, contradicts the famous formula establishing the equivalence of mass and energy. But the discovery of quarks makes it possible to present classical electrodynamics in a form free from the indicated contradiction. In the article, having considered the electromagnetic field in a curvilinear coordinate system, a theory has been created that expands our understanding of the electromagnetic field, the nature of quarks, the nature of strong interaction, and the connection between strong interaction and electromagnetic interaction. This theory is based on the principle of equivalence of an electromagnetic field to a free material particle formulated in the article and the law of formation of elementary particles from an electromagnetic field that follows from it.

关键词： electrodynamics Electromagnetic Field Curvilinear Coordinates Quarks Strong Interaction Equation of a Geodesic Line

Simulation of molecular spectroscopy with circuit quantum electrodynamics

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2018年第5期63卷 293-299页

作者： Ling Hu Yue-Chi Ma Yuan Xu Wei-Ting Wang Yu-Wei Ma Ke Liu Hai-Yan Wang Yi-Pu Song Man-Hong Yung Lu-Yan Sun Center for Quantum Information Institute for Interdisciplinary Information Sciences Tsinghua University Beijing 100084 China institute for Quantum-Science and Engineering and Department of Physics South University of Science and Technology of China Shenzhen 518055 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen 518055 China

Spectroscopy is a crucial laboratory technique for understanding quantum systems through their interactions with the electromagnetic radiation.Particularly,spectroscopy is capable of revealing the physical structure of molecules,leading to the development of the maser—the forerunner of the laser.However,real-world applications of molecular spectroscopy are mostly confined to equilibrium states,due to computational and technological constraints;a potential breakthrough can be achieved by utilizing the emerging technology of quantum simulation.Here we experimentally demonstrate through a toy model,a superconducting quantum simulator capable of generating molecular spectra for both equilibrium and non-equilibrium states,reliably producing the vibronic structure of diatomic molecules.Furthermore,our quantum simulator is applicable not only to molecules with a wide range of electronic-vibronic coupling strength,characterized by the Huang-Rhys parameter,but also to molecular spectra not readily accessible under normal laboratory conditions.These results point to a new direction for predicting and understanding molecular spectroscopy,exploiting the power of quantum simulation.

关键词： Molecular spectroscopy Circuit quantum electrodynamics Correlation function Huang-Rhys parameter

Generalized variational principles for boundary value problem of electromagnetic field in electrodynamics

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2010年第4期31卷 471-480页

作者：刘彬王作君郑世科 Key Laboratory of Measurement Technology and Instrumentation of Hebei Province Yanshan University Qinhuangdao 066004 Hebei Province P. R. China

An expression of the generalized principle of virtual work for the boundary value problem of the linear and anisotropic electromagnetic field is given. Using Chien＇s method, a pair of generalized variational principles （GVPs） are established, which directly leads to all four Maxwell＇s equations, two intensity-potential equations, two constitutive equations, and eight boundary conditions. A family of constrained variational principles is derived sequentially. As additional verifications, two degenerated forms are obtained, equivalent to two known variational principles. Two modified GVPs are given to provide the hybrid finite element models for the present problem.

关键词： generalized variational principle （GVP） electromagnetic field electrodynamics boundary value problem finite element method

Two-atom distributed entanglement by detecting the transmission spectrum of a coupled-cavity quantum electrodynamics system

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2015年第9期13卷 73-76页

作者：钟啸林林功伟周凤雪钮月萍龚尚庆 Department of Physics East China University of Science and Technology

A scheme is presented to generate atomic entanglement by detecting the transmission spectrum of a coupled- cavity system. In the scheme, two 3-level atoms are trapped in separate cavities coupled by a short optical fiber, and the atomic entanglement could be realized in a heralded way by detecting the transmission spectrum of the coupled-cavity system.

关键词： Atoms electrodynamics Optical fibers Quantum electronics Quantum theory

Dynamics of Particles Around a Regular Black Hole with Nonlinear electrodynamics

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2016年第11期65卷 509-516页

作者： Abdul Jawad Farhad Ali Mubasher Jamil Ujjal Debnath Department of Mathematics COMSATS Institute of Information Technology Department of Mathematics Kohat University of Science and Technology Department of Mathematics School of Natural Sciences (SNS) National University of Sciences and Technology (NUST) Department of Mathematics Indian Institute of Engineering Science and Technology

We investigate the dynamics of a charged particle being kicked off from its circular orbit around a regular black hole by an incoming massive particle in the presence of magnetic field. The resulting escape velocity, escape energy and the effective potential are analyzed. It is shown that the presence of even a very weak magnetic field helps the charged particles in escaping the gravitational field of the black hole. Moreover the effective force acting on the particle visibly reduces with distance. Thus particle near the black hole will experience higher effective force as compared to when it is far away.

关键词： center of mass energy escape velocity electrodynamics regular black hole

Weak cosmic censorship conjecture in the nonlinear electrodynamics black hole under the charged scalar field

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2020年第1期72卷 89-95页

作者： Tianhao Bai Wei Hong Benrong Mu Jun Tao Center for Theoretical Physics College of PhysicsSichuan UniversityChengdu610065China Physics Teaching and Research Section College of Medical TechnologyChengdu University of Traditional Chinese MedicineChengdu 611137China

In this paper,we study the thermodynamics and the weak cosmic censorship conjecture of the nonlinear electrodynamics black hole under the scattering of a charged complex scalar field.According to the energy and charge fluxes of the scalar field,the variations of this black hole’s energy and charge can be calculated during an infinitesimal time interval.With scalar field scattering,the variation of the black hole is calculated in the extended and normal phase spaces.In the normal phase space,the cosmological constant and the normalization parameter are fixed,and the first and second laws of thermodynamics can also be satisfied.In the extended phase space,the cosmological constant and the normalization parameter are considered as thermodynamic variables,and the first law of thermodynamics is valid,but the second law of thermodynamics is not valid.Furthermore,the weak cosmic censorship conjecture is both valid in the extended and normal phase spaces.

关键词： nonlinear electrodynamics black hole weak cosmic censorship conjecture complex scalar field thermodynamics

Applications of Galilei Covariant electrodynamics to VacuumSubstratum Phenomena in Absolute Space and Time

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 1995年第4期6卷 59-85页

作者： H E. Wilhelm (AED-Technologies, Thermopolis, WY 82443, U.S. A) AED-Technologies Thermopolis WY 82443 U. S. A

The Galilei covariant generalizations of the EM field equations (1984) (including moving media), Schroedinger, and Dirac (1985, 1993) equations for inertial frames S(w) with substratum velocity w are re- viewed. By G-covariant electrodynamics, physical variables, e.g., rod length, clock rate, particle mass, momentum, and energy are G-invariants, determined by the object velocity v-w= vo=G-inv relative to the substratum frame, So(w=0) [v=object velocity relative to observer in S(w)] Galilean measurements using standard (i) contracted rods and (ii) retarded clocks, anisotropic light propagation, and conservation of EM energy and momentum in IFs S(w) are discussed. Fundamental experiments are formulated which permit measurement of substratum (w) induced EM and charge fields, the substratum velocity w, and verification of the G-invariance of the magnetic field, B= Bo=G-inv. The G-invariant Lagrangian and Hamiltonian of a charged particle in EM fields, and the momentum and energy conservation equations in Particle collisions are given for velocities |v-w|electrodynamics is examined for subluminal and superluminal electron velocities. Both the Cerenkov effect in (i) dielectrics for Iv--wl> c(ro) and (ii) vacuum for |v-w| > co are relative to the substratum So, and demonstrate the anisotropy of the vacuum in IFs S(w). G-covariant electrodynamics (relative to substratum) contains Lorentz covariant electrodynamics (relative to observer) in the special case w = 0 (So).

关键词： Vacuum substratum Galilei covariance electrodynamics Quantum mechanics Substratum effects Substratum experiments Failure of special relativity.

Computational electrodynamics The Finite-Difference Time-Domain Method,2nd Bk&CD 2nd ed. /

在线全文

学校读者我要写书评

暂无评论