Article
Chemistry, Physical
Xuechen Zheng, Chaoqun Zhang, Junzi Liu, Lan Cheng
Summary: “This paper reports the development of analytic gradients for the relativistic coupled-cluster singles and doubles method augmented with a non-iterative triples method (CCSD(T)). Efficient CC geometry optimizations with spin-orbit coupling are enabled using an all-electron exact two-component Hamiltonian with atomic mean-field spin-orbit integrals (X2CAMF). The applicability of the implementation is demonstrated through benchmark calculations of equilibrium structures, harmonic vibrational frequencies, rotational constants, and infrared spectrum for methyl halides and a radioactive molecular ion.”
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Nuclear
Yu. D. Chernichenko
Summary: Exact solutions of relativistic quasipotential equations in the configuration representation are found for the s-state wave function for a composite system of two arbitrary-mass relativistic spinor quarks interacting via a Coulomb-like chromodynamic potential. The quantization conditions for the energy levels of the meson s-wave state in different spinor structures are determined, along with expressions for the relativistic threshold resummation S factor corresponding to a Coulomb-like chromodynamic potential and properties of this factor. New regularities in the behavior of the threshold S factor are revealed in the study.
PHYSICS OF ATOMIC NUCLEI
(2021)
Article
Optics
Jacek Zatorski, Vojtech Patkos, Krzysztof Pachucki
Summary: We perform a calculation of quantum electrodynamics effects in excited states with l > 1 of arbitrary twobody systems up to alpha 6 order. The results obtained are valid for hadronic atoms, as long as the strong interaction effects are negligible. We demonstrate that for circular states with l similar to n, the effective expansion parameter is Z alpha/n, which extends the applicability of the derived formulas to heavy ions. Moreover, inclusion of higherorder terms is feasible, which indicates that accurate measurements of excited states of, for example, muonic or antiprotonic hydrogenic ions can be used to determine the fundamental constants and to search for the existence of yet unknown long-range interactions.
Article
Computer Science, Interdisciplinary Applications
Yi Wang, Guoxi Ni, Xiao Xu
Summary: In this paper, a modified UGKS method is proposed to solve the collisional Vlasov Maxwell equations for stimulated Raman scattering in two dimension, considering the Coulomb collisions. The validity is verified through a series of typical problems.
COMPUTERS & FLUIDS
(2022)
Article
Astronomy & Astrophysics
Gerardo Alvarez, Aniket Joglekar, Mehrdad Phoroutan-Mehr, Hai-Bo Yu
Summary: Neutron stars' dense environment makes them an excellent target for studying dark matter interactions with the Standard Model. This study investigates the heating of neutron stars caused by the capture of inelastic dark matter, which avoids direct detection constraints. It derives analytical expressions for the maximal mass gap allowed for the scattering process and applies them to calculate the capture rate in neutron stars. The constraints from neutron stars can exceed those from terrestrial searches, including direct detection and collider experiments, making them an important target for exploring dark matter.
Article
Mechanics
Xizhuo Chen, Haitao Yu
Summary: In this study, a novel micropolar peridynamic model is proposed to simulate the fracture behaviors of rock masses with arbitrary joints. The rock masses are discretized into material points linked through ordinary and joint bonds. Peridynamic parameters are introduced to ensure consistency with continuum mechanics. A stress-based failure criterion is proposed to describe dynamic fracture of jointed rocks. The model is verified using experimental observations and numerical examples demonstrate its accuracy in capturing wave transmission and crack development in rocks with different joint sets. The influence of joint geometry on failure characteristics is also investigated.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Tommaso Armadillo, Roberto Bonciani, Simone Devoto, Narayan Rana, Alessandro Vicini
Summary: We present an algorithm to evaluate multiloop Feynman integrals with an arbitrary number of internal massive lines, with the masses being in general complex-valued, and its implementation in the Mathematica package SeaSyde. The implementation solves by series expansions the system of differential equations satisfied by the Master Integrals. At variance with respect to other existing codes, the analytical continuation of the solution is performed in the complex plane associated to each kinematical invariant. We present the results of the evaluation of the Master Integrals relevant for the NNLO QCD-EW corrections to the neutral-current Drell-Yan processes.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Abdullah Guvendi, Semra Gurtas Dogan
Summary: This study investigated the relativistic dynamics of two oppositely charged fermions interacting with an external magnetic field, without considering charge-charge interaction. By choosing the symmetric gauge for the interaction with the magnetic field, a precise solution was obtained for the corresponding fully-covariant two-body Dirac equation. The dynamic symmetry of the system allowed for the determination of relativistic Landau levels without using group theoretical methods.
Article
Physics, Particles & Fields
Zhi-Yong Zhou, Zhiguang Xiao
Summary: The general appearance of two-pole structures is demonstrated in a relativistic Friedrichs-Lee model combined with a relativistic quark pair creation model. These structures account for the origin of various enigmatic states and contribute significantly to phase shifts in scattering processes in a single channel approximation. This relativistic scheme offers insights into understanding the properties of non-q (q) over bar states and suggests that such structures are worth studying from theoretical and experimental perspectives.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Thermodynamics
Yanan Camaraza-Medina, Abel Hernandez-Guerrero, J. Luis Luviano-Ortiz
Summary: View factor calculation is essential in radiation heat transfer, but there is a lack of analytical expressions for complex surface combinations. This study introduces an analytical method to calculate the view factor for 11 combinations of perpendicular or parallel rectangular surfaces, and compares the results with existing methods.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Mathematics
Delia Ionescu-Kruse, Rossen Ivanov
Summary: This paper investigates the two-dimensional water-wave problem in a fluid volume with a general non-zero vorticity field, involving the nonlinear equations of motion for the free surface and volume variables in the fluid domain. The Dirichlet-Neumann operator and the Green function of the Laplace operator are used to provide new explicit expressions for these variables. The interaction between a point vortex and the free surface is studied as an example, obtaining coupled equations for the dynamics of the point vortex and the time evolution of the free surface variables in the small-amplitude long-wave Boussinesq and KdV regimes.
JOURNAL OF DIFFERENTIAL EQUATIONS
(2023)
Article
Physics, Particles & Fields
O. Tarasov
Summary: The method of functional reduction for dimensionally regularized one-loop Feynman integrals with massive propagators is explained, based on the author's proposed functional relations. Explicit formulae are provided for simplifying one-loop scalar integrals by expressing them as ratios of polynomials in masses and kinematic invariants. It is shown that a general scalar n-point integral can be expressed as a linear combination of integrals depending only on n variables, and these integrals are explicitly given in terms of hypergeometric functions of (n - 1) dimensionless variables.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Optics
Wanli Lu, Huajin Chen, Shiyang Liu, Zhifang Lin
Summary: An arbitrary conical angle is introduced to study the propagation properties of circular Airy beams beyond the paraxial approximation. It is found that the nonparaxiality becomes obvious for large conical angles, and the field intensity at the focal point can be enhanced by adjusting the conical angle. Moreover, the longitudinal component of the field is enhanced and the longitudinal gradient of the field intensity is enlarged for large conical angles, suggesting the possibility of stable optical trapping for microparticles.
Article
Engineering, Mechanical
Mate Antali, Gabor Stepan
Summary: This paper analyzes the general kinematics and dynamics of a rigid body in contact with two rigid surfaces in the presence of dry friction, exploring the characteristics of contact forces and the conditions of static friction forces in two-point rolling. The issue is resolved by analyzing the system's vector field, leading to a method to determine the conditions for the realization of two-point rolling without slipping based on the concept of limit directions of codimension-2 discontinuities.
NONLINEAR DYNAMICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Saeed Shamloo, Meysam Imani
Summary: This study investigates the effect of the adjacency of two strip footings on the bearing capacity of rock masses using upper bound analysis and finite element method. The research shows that the distance between the footings plays a significant role in how they interact with each other and affect the ultimate bearing capacity of the rock masses. By varying parameters, the maximum distance of mutual influence between the two footings and the impact of reducing the distance between footings on the bearing capacity can be determined.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Physics, Multidisciplinary
S. M. Dorkin, L. P. Kaptari, B. Kaempfer
Article
Physics, Multidisciplinary
L. P. Kaptari, A. Kotikov, N. Yu Chernikova, P. Zhang
Article
Physics, Nuclear
Yu D. Chernichenko
PHYSICS OF ATOMIC NUCLEI
(2019)
Article
Physics, Multidisciplinary
L. P. Kaptari, B. Kaempfer, Pengming Zhang
EUROPEAN PHYSICAL JOURNAL PLUS
(2019)
Article
Physics, Multidisciplinary
L. P. Kaptari, B. Kaempfer
Article
Physics, Multidisciplinary
Yu. D. Chernichenko
Summary: The new form factor components of a bound state of two fermions with equal masses in a relativistic scenario were obtained, with consideration given to the vector current case. This study was conducted within the framework of the relativistic quasipotential approach, transitioning to a three-dimensional relativistic configurational representation for two relativistic particles with equal masses and spin 1/2.
NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
(2021)
Article
Physics, Nuclear
Yu D. Chernichenko
Summary: A new relativistic semiclassical expression for the leptonic decay widths of vector mesons composed of two quarks with equal masses is derived and compared with nonrelativistic analogs. The effect of the spins of equal-mass quarks forming vector mesons on the behavior of the leptonic decay widths is analyzed within the relativistic quasipotential approach.
PHYSICS OF ATOMIC NUCLEI
(2022)
Article
Physics, Nuclear
Yu. D. Chernichenko
Summary: Exact solutions of relativistic quasipotential equations in the configuration representation are found for the s-state wave function for a composite system of two arbitrary-mass relativistic spinor quarks interacting via a Coulomb-like chromodynamic potential. The quantization conditions for the energy levels of the meson s-wave state in different spinor structures are determined, along with expressions for the relativistic threshold resummation S factor corresponding to a Coulomb-like chromodynamic potential and properties of this factor. New regularities in the behavior of the threshold S factor are revealed in the study.
PHYSICS OF ATOMIC NUCLEI
(2021)
Article
Physics, Multidisciplinary
Yu D. Chernichenko, L. P. Kaptari, O. P. Solovtsova
NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
(2020)
Article
Physics, Nuclear
Yu. D. Chernichenko
PHYSICS OF ATOMIC NUCLEI
(2020)
Proceedings Paper
Quantum Science & Technology
Sergey Dorkin, Leonid Kaptari, Burkhard Kaempfer
XXIV INTERNATIONAL BALDIN SEMINAR ON HIGH ENERGY PHYSICS PROBLEMS: RELATIVISTIC NUCLEAR PHYSICS AND QUANTUM CHROMODYNAMICS (BALDIN ISHEPP XXIV)
(2019)
Article
Astronomy & Astrophysics
L. P. Kaptari, A. V. Kotikov, N. Yu. Chernikova, Pengming Zhang