Article
Physics, Multidisciplinary
Ko Sanders
Summary: In this study, we investigate separable and physically reasonable states in relativistic quantum field theory. Specifically, we examine the minimum energy density required for the existence of separable states between spacelike separated regions. This research provides insights into the interplay between entanglement entropy and energy density, which is important in various fields including black hole thermodynamics. We focus on a linear scalar quantum field in a four-dimensional globally hyperbolic spacetime with a trivial topology. For general spacelike separated regions A and B, we prove the existence of a separable quasi-free Hadamard state. Moreover, we present a more precise construction for massive free scalar fields in Minkowski spacetime, ensuring the separability between any two regions in an inertial time slice with distance greater than R. The energy density of these states is also shown to be bounded.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Astronomy & Astrophysics
Antoine Tilloy
Summary: Variational method is a powerful approach to solve many-body quantum problems nonperturbatively, but faces challenges in relativistic quantum field theory due to the need to meet three seemingly incompatible requirements. In the case of numerical evidence, the error decreases faster than any power law in the number of parameters, while the cost remains only polynomial.
Article
Physics, Multidisciplinary
Nahuel Miron Granese, Alejandra Kandus, Esteban Calzetta
Summary: Thermal and turbulent fluctuations play a significant role in relativistic fluids, and they can be translated into quantum field theory problems using the Martin-Siggia-Rose technique.
Article
Physics, Particles & Fields
Lucrezia Ravera, Utku Zorba
Summary: We present non-and ultra-relativistic Jackiw- Teitelboim (JT) supergravity as metric BF theories based on the extended Newton-Hooke and extended AdS Carroll superalgebras in two spacetime dimensions, respectively. The extended Newton-Hooke structure, and, in particular, the invariant metric necessary for the BF construction of non-relativistic JT supergravity, is obtained by performing an expansion of the N = 2 AdS(2) superalgebra. Finally, we provide the Carrollian JT supergravity action in the BF formalism.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Fernando Romero-Lopez, Akaki Rusetsky, Nikolas Schlage, Carsten Urbach
Summary: The paper presents a general method for deriving the energy shift of an interacting system of N spinless particles using nonrelativistic effective field theory, with relativistic corrections explicitly included. This method is applied to obtain the ground state of N particles and the first excited state of two and three particles to a certain order, based on the threshold parameters of relativistic scattering amplitudes. The resulting expressions are used to analyze the N-particle ground state energy shift in the complex phi (4) theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Computer Science, Interdisciplinary Applications
G. Gaigalas, D. Kato
Summary: The latest version of the grasp2018 package extends the multiconfigurational Dirac-Hartree-Fock method to account for crystal field effects in complex systems. Instead of using simplified treatments, this program uses a fully ab-initio method to handle crystal field effects, with examples provided in the source directory for CF_Hamiltonian program usage.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Lixin Lu, Hang Hu, Andrew J. Jenkins, Xiaosong Li
Summary: As relativistic corrections become stronger for late-row elements, the fully perturbative treatment may not be adequate for accurate descriptions of chemical properties. In this work, a determinant-based Kramers-unrestricted exact-two-component multi-reference second-order perturbation method is introduced, which includes relativistic corrections with a perturbative dynamic correlation.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2022)
Article
Physics, Multidisciplinary
Philip Kurian
Summary: This paper derives a relativistic expression for the energy shift of free electron systems in the presence of weak electromagnetic fields, starting from the Dirac Hamiltonian. The average relativistic energy shift is found to be independent of electron spin-polarization coefficients and larger than the analogous Zeeman shift predicted in quantum mechanics. Furthermore, the paper discusses how to discern between achiral and completely polarized states in the non-relativistic limit, and explores the mesoscopic and macroscopic manifestations of electron spin states in the physical world with implications for complex systems like biology.
Article
Chemistry, Inorganic & Nuclear
Robert Polly, Bianca Schacherl, Joerg Rothe, Tonya Vitova
Summary: Relativistic multiconfigurational all-electron ab initio calculations, including spin-orbit interaction, accurately reproduce experimental results for uranyl's 3d4f resonant 5f inelastic X-ray scattering (RIXS) map. The calculated data provide insights into the fine structure splitting of 4f orbitals induced by trans di-oxo bonds in uranyl, allowing for a clear understanding of energy differences between 5f and 4f orbitals. Ab initio calculations show the versatility of multiconfigurational protocols in studying RIXS maps of systems containing actinides.
INORGANIC CHEMISTRY
(2021)
Article
Physics, Particles & Fields
Fabian Mueller, Jin-Yi Pang, Akaki Rusetsky, Jia-Jun Wu
Summary: In this paper, a three-particle quantization condition on the lattice is formulated in a manifestly relativistic-invariant form using a generalization of the non-relativistic effective field theory (NREFT) approach. The inclusion of higher partial waves is explicitly addressed, and the quantization condition is partially diagonalized into irreducible representations of the octahedral group in both the center-of-mass frame and moving frames. By generating synthetic data in a toy model, the relativistic invariance of the three-body bound state spectrum is explicitly demonstrated.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
X. B. Li, L. F. Gan, J. Wang, J. L. Jiao, S. Jin, H. B. Zhuo, C. T. Zhou, S. P. Zhu, X. T. He, B. Qiao
Summary: A semiclassical method is developed to study the spin evolution of a relativistic electron in a fully relativistic laser pulse, showing deviations from the classical method in terms of spin operator mean values. The study also proposes an experimental setup utilizing an asymmetric field of a single-cycle laser to observe the total change of spin easily after interaction.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Nuclear
D. Anchishkin
Summary: This article proposes a quantum generalization of the Cooper-Frye recipe and calculates the single-particle spectrum in relativistic collisions within the framework of thermal quantum field theory. By solving the initial-value problem of particle radiation from a space-like hypersurface, a single-particle spectrum is obtained using the 'lesser' Green's function associated with the fireball environment. Specific conditions for particle emission are considered based on this result.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2022)
Article
Physics, Multidisciplinary
Russell B. B. Thompson
Summary: This article summarizes the quantum-classical isomorphism for self-consistent field theory, which represents quantum particles in space-time as classical one-dimensional threads in a five-dimensional thermal space-time. Introduced by Feynman, this isomorphism has been shown to be the same as quantum density functional theory and can explain a range of quantum phenomena. The advantages of using the 5D picture include fewer postulates, no measurement problem, and the use of classical concepts in the higher dimensional space. However, limitations such as the interpretation of entanglement and spin are discussed.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2023)
Article
Chemistry, Physical
Xiang Yuan, Lucas Visscher, Andre Severo Pereira Gomes
Summary: This paper presents the implementation of a module for generating natural orbitals (NOs) for correlated wavefunctions, particularly the second order Moller-Plesset perturbation frozen natural orbitals (MP2FNOs), as part of a novel implementation of relativistic coupled cluster theory. The study finds that MP2FNOs accelerate the convergence of correlation energy uniformly across the Periodic Table and reliable estimates for energy and molecular properties can be obtained by truncating the virtual molecular orbital spaces to about half their original size.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
O. Novak, M. Diachenko, R. Kholodov
Summary: The probability of photoionization of a heavy hydrogen-like ion is calculated using relativistic perturbation theory. The accurate account of the Coulomb potential of a heavy nucleus is achieved by solving the Dirac equation. The obtained probability is compared to the nonrelativistic limit and to nonperturbative results from numerical solutions of the time-dependent Dirac equation. Suppression of ionization is observed in the secondary ionization channel at a photon frequency approximately equal to mc(2)/PLANCK CONSTANT OVER TWO PI omega.
Article
Physics, Nuclear
Yu D. Chernichenko
PHYSICS OF ATOMIC NUCLEI
(2015)
Article
Physics, Nuclear
Yu. D. Chernichenko
PHYSICS OF ATOMIC NUCLEI
(2017)
Article
Physics, Nuclear
V. V. Kondratjuk, Yu. D. Chernichenko
PHYSICS OF ATOMIC NUCLEI
(2018)
Article
Physics, Nuclear
Yu. D. Chernichenko
PHYSICS OF ATOMIC NUCLEI
(2018)
Article
Physics, Nuclear
Yu. D. Chernichenko
PHYSICS OF ATOMIC NUCLEI
(2014)
Article
Physics, Nuclear
Yu. D. Chernichenko
PHYSICS OF ATOMIC NUCLEI
(2019)
Article
Physics, Nuclear
Yu D. Chernichenko
PHYSICS OF ATOMIC NUCLEI
(2019)
Article
Physics, Multidisciplinary
Yu D. Chernichenko, L. P. Kaptari, O. P. Solovtsova
Summary: The paper presents a new resummation of the S-factor for a composite system of two interacting relativistic spin-1/2 particles, focusing on the behavior of the S-factor under different conditions and the impact of spin on the S-factor. It establishes a connection between the new and previously obtained S-factors for different types of particles.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
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)
Article
Physics, Multidisciplinary
Yu. D. Chernichenko
NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
(2017)
Article
Physics, Multidisciplinary
Yu D. Chernichenko, V. V. Kondratjuk
NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
(2018)
