Nuclear Theory·nucl-th

Wednesday·May 18, 2022

12 papers—1 primary·11 cross-listed

01
[Submitted on 17 May 2022]
Discrete ambiguities in a partial-wave analysis of pseudoscalar photoproduction with truncation in total angular momentum
A.Fix🇷🇺 · I.Dementjev🇷🇺
The discrete ambiguities appearing in the complete experiment problem for single pseudoscalar meson photoproduction within truncated partial-wave analysis are discussed. It is shown that, in addition to the double ambiguity known from previous works, it is always necessary to take into account another ambiguity arising when truncation in total angular momentum is employed.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2205.08074 [pdf]
J.Phys.G(2023)·3 citations
02
[Submitted on 16 May 2022] (cross-list from hep-ph)
Quantum Simulation of Light-Front QCD for Jet Quenching in Nuclear Environments
Xiaojun Yao🇺🇸
We develop a framework to simulate jet quenching in nuclear environments on a quantum computer. The formulation is based on the light-front Hamiltonian dynamics of QCD. The Hamiltonian consists of three parts relevant for jet quenching studies: kinetic, diffusion and splitting terms. In the basis made up of $n$ -particle states in momentum space, the kinetic Hamiltonian is diagonal. Matrices representing the diffusion and splitting parts are sparse. The diffusion part of the Hamiltonian depends on classical background gauge fields, which need to be sampled classically before constructing quantum circuits for the time evolution. The cost of the sampling scales linearly with the time length of the evolution and the momentum grid volume. The framework automatically keeps track of quantum interference and thus it can be applied to study the Landau-Pomeranchuk-Migdal effect in cases with more than two coherent splittings, which is beyond the scope of state-of-the-art analyses, no matter whether the medium is static or expanding, thin or thick, hot or cold. We apply this framework to study a toy model and gluon in-medium radiation on a small lattice. The essence of the Landau-Pomeranchuk-Migdal effect is observed in the quantum simulation results of both the toy model and the gluon case, which is quantum decoherence caused by medium interactions that suppresses the total radiation probability.
Comments:
56 pages, 9 figures; v2: add a section on the simulation of the LPM effect in gluon radiation; v3: added more discussions in introduction, modified discussions of simulation results
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2205.07902 [pdf]
23 citations
03
[Submitted on 16 May 2022] (cross-list from astro-ph.HE)
Oscillating Magnetized Color Superconducting Quark Stars
Marcos Osvaldo Celi🇦🇷 · Mauro Mariani🇦🇷 · Milva Gabriela Orsaria🇦🇷 · Lucas Tonetto🇮🇹
The main objective of this work is to study the structure, composition, and oscillation modes of color superconducting quark stars with intense magnetic fields. We adopted the MIT bag model within the color superconductivity CFL framework, and we included the effects of strong magnetic fields to construct the equation of state of stable quark matter. We calculated observable quantities, such as the mass, radius, frequency, and damping time of the oscillation fundamental $f$ mode of quark stars, taking into account current astrophysical constraints. The results obtained show that color superconducting magnetized quark stars satisfy the constraints imposed by the observations of massive pulsars and gravitational wave events. Furthermore, the quantities associated with the oscillation $f$ mode of these objects fit the universal relationships for compact objects. In the context of the new multi-messenger gravitational wave astronomy era and the future asteroseismology of neutron stars, we hope that our results contribute to the understanding of the behavior of dense matter and compact objects.
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
arXiv:
2205.07928 [pdf]
Universe(2022)·3 citations
04
[Submitted on 16 May 2022] (cross-list from cs.LG)
Application of multilayer perceptron with data augmentation in nuclear physics
Hüseyin Bahtiyar · Derya Soydaner · Esra Yüksel
Neural networks have become popular in many fields of science since they serve as promising, reliable and powerful tools. In this work, we study the effect of data augmentation on the predictive power of neural network models for nuclear physics data. We present two different data augmentation techniques, and we conduct a detailed analysis in terms of different depths, optimizers, activation functions and random seed values to show the success and robustness of the model. Using the experimental uncertainties for data augmentation for the first time, the size of the training data set is artificially boosted and the changes in the root-mean-square error between the model predictions on the test set and the experimental data are investigated. Our results show that the data augmentation decreases the prediction errors, stabilizes the model and prevents overfitting. The extrapolation capabilities of the MLP models are also tested for newly measured nuclei in AME2020 mass table, and it is shown that the predictions are significantly improved by using data augmentation.
Subjects:
Machine Learning (cs.LG); Nuclear Theory (nucl-th)
arXiv:
2205.07953 [pdf]
Appl.Soft Comput.(2022)·4 citations
05
[Submitted on 16 May 2022] (cross-list from nucl-ex)
Horizons: Nuclear Astrophysics in the 2020s and Beyond
H. Schatz🇺🇸 · A. D. Becerril Reyes🇺🇸 · A. Best🇮🇹 · E. F. Brown🇺🇸 · K. Chatziioannou🇺🇸 · K. A. Chipps🇺🇸 · C. M. Deibel🇺🇸 · R. Ezzeddine🇺🇸 · D. K. Galloway🇦🇺 · C. J. Hansen🇩🇪 · F. Herwig🇨🇦 · A. P. Ji🇺🇸 and 153 other authors
Nuclear Astrophysics is a field at the intersection of nuclear physics and astrophysics, which seeks to understand the nuclear engines of astronomical objects and the origin of the chemical elements. This white paper summarizes progress and status of the field, the new open questions that have emerged, and the tremendous scientific opportunities that have opened up with major advances in capabilities across an ever growing number of disciplines and subfields that need to be integrated. We take a holistic view of the field discussing the unique challenges and opportunities in nuclear astrophysics in regards to science, diversity, education, and the interdisciplinarity and breadth of the field. Clearly nuclear astrophysics is a dynamic field with a bright future that is entering a new era of discovery opportunities.
Comments:
96 pages. Submitted to Journal of Physics G
Subjects:
Nuclear Experiment (nucl-ex); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
arXiv:
2205.07996 [pdf]
J.Phys.G(2022)·48 citations
06
[Submitted on 17 May 2022] (cross-list from hep-th)
Gyrohydrodynamics: Relativistic spinful fluid with strong vorticity
Zheng Cao🇨🇳 · Koichi Hattori🇨🇳 · Masaru Hongo🇯🇵 · Xu-Guang Huang🇨🇳 · Hidetoshi Taya🇯🇵
We develop a relativistic (quasi-)hydrodynamic framework, dubbed the gyrohydrodynamics, to describe fluid dynamics of many-body systems with spin under strong vorticity based on entropy-current analysis. This framework generalizes the recently-developed spin hydrodynamics to the regime where the spin density is at the leading order in derivatives but suppressed by another small parameter, the Planck constant $ℏ$ , due to its quantum nature. Our analysis shows that the complete first-order constitutive relations of gyrohydrodynamics involve seventeen transport coefficients and are highly anisotropic.
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2205.08051 [pdf]
PTEP(2022)·56 citations
07
[Submitted on 17 May 2022] (cross-list from hep-ph)
Semi-inclusive Diffractive Deep Inelastic Scattering at Small- $x$
Yoshitaka Hatta🇺🇸 · Bo-Wen Xiao🇨🇳 · Feng Yuan🇺🇸
Inspired by a recent study of Iancu, Mueller and Triantafyllopoulos [1] and earlier papers by Golec-Biernat and Wusthoff [2,3], we propose semi-inclusive diffractive deep inelastic scattering (SIDDIS) to investigate the gluon tomography in the nucleon and nuclei at small- $x$ . The relevant diffractive quark and gluon parton distribution functions (DPDF) can be computed in terms of the color dipole S-matrices in the fundamental and adjoint representations, respectively. Novel correlations from the gluon tomography in the dipole S-matrix can be experimentally studied through the DPDFs in these processes at the future electron-ion collider (EIC).
Comments:
Added appendices, 10 pages, 5 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2205.08060 [pdf]
PRD(2022)·62 citations
08
[Submitted on 17 May 2022] (cross-list from hep-ph)
Restriction on the form of quark anomalous magnetic moment from lattice QCD results
Mamiya Kawaguchi🇨🇳 · Mei Huang🇨🇳
The quark anomalous magnetic moment (AMM) is dynamically generated through the spontaneous chiral symmetry breaking. It has been revealed that even though its exact form is still unknown, the quark AMM is essential to explore quark matter properties and QCD phase structure under external magnetic fields. In this study, we take three different forms of the quark AMM and investigate its influence on the chiral phase transition under magnetic field. In general, a negative quark AMM plays the role as magnetic catalyzer and a positive quark AMM plays the role of magnetic inhibition. It is found that a constant quark AMM drives an unexpected 1st order chiral phase transition; a quark AMM proportional to the chiral condensate gives a flip of the sign on the chiral condensate; and a quark AMM proportional to the square of chiral condensate can produce results of chiral condensate as functions of the temperature and the magnetic field in good agreement with the lattice result.
Comments:
14 pages, 13 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2205.08169 [pdf]
CPC(2023)·19 citations
09
[Submitted on 17 May 2022] (cross-list from hep-ph)
Stability of Classical Chromodynamic Fields -- Addendum
Sylwia Bazak🇵🇱 · Stanislaw Mrowczynski🇵🇱
A system of chromodynamic fields, which can be treated as classical, is generated at the earliest stage of relativistic heavy-ion collisions. Numerical simulations show that the system is unstable but the nature of the instability is not well understood. We study the problem systematically. In the first paper, we have performed a linear stability analysis of space-time uniform chromoelectric and chromomagnetic fields. There they have been considered the Abelian configurations of single-color potentials linearly depending on coordinates and nonAbelian ones where the fields are generated by the multi-color non-commuting uniform potentials. Here we extend and supplement the analysis. We discuss the parallel chromoelectric and chromomagnetic fields which occur simultaneously. We also consider a general nonAbelian configurations of the uniform fields. Finally, we discuss the gauge dependence of our results.
Comments:
10 pages, no figures, Physical Review D in print
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2205.08282 [pdf]
PRD(2022)·5 citations
10
[Submitted on 17 May 2022] (cross-list from hep-ph)
Structure of exotic hadrons by a weak-binding relation with finite-range correction
Tomona Kinugawa🇯🇵 · Tetsuo Hyodo🇯🇵
The composite nature of a shallow bound state is studied by using the weak-binding relation, which connects the compositeness of the bound state with observables. We first show that the previous weak-binding relation cannot be applied to the system with a large effective range. To overcome this difficulty, we introduce the finite-range correction by redefining the typical length scale in the weak-binding relation. A method to estimate the uncertainty of the compositeness is proposed. It is numerically demonstrated that the range correction enlarges the applicable region of the weak-binding relation. Finally, we apply the improved weak-binding relation to the actual hadrons, nuclei, and atomic systems [deuteron, $X (3872)$ , $D_{s 0}^{*} (2317)$ , $D_{s 1} (2460)$ , $N Ω$ dibaryon, $ΩΩ$ dibaryon, $_{Λ}^{3} H$ , and $^{4} He$ dimer] to discuss their internal structure from the compositeness. We present a reasonable estimation of the compositeness of the deuteron by properly taking into account the uncertainty. The results of $X (3872)$ and the $N Ω$ dibaryon show that the range correction is important to estimate the compositeness of physical states.
Comments:
18 pages, 11 figures, 5 tables, published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2205.08470 [pdf]
PRC(2022)·23 citations
11
[Submitted on 17 May 2022] (cross-list from astro-ph.HE)
An updated nuclear-physics and multi-messenger astrophysics framework for binary neutron star mergers
Peter T.H.Pang🇳🇱 · Tim Dietrich🇩🇪 · Michael W.Coughlin🇺🇸 · Mattia Bulla🇸🇪 · Ingo Tews🇺🇸 · Mouza Almualla🇦🇪 · Tyler Barna🇺🇸 · Weizmann Kiendrebeogo🇫🇷 · Nina Kunert🇩🇪 · Gargi Mansingh🇺🇸 · Brandon Reed🇺🇸 · Niharika Sravan🇺🇸 and 9 other authors
The multi-messenger detection of the gravitational-wave signal GW170817, the corresponding kilonova AT2017gfo and the short gamma-ray burst GRB170817A, as well as the observed afterglow has delivered a scientific breakthrough. For an accurate interpretation of all these different messengers, one requires robust theoretical models that describe the emitted gravitational-wave, the electromagnetic emission, and dense matter reliably. In addition, one needs efficient and accurate computational tools to ensure a correct cross-correlation between the models and the observational data. For this purpose, we have developed the Nuclear-physics and Multi-Messenger Astrophysics framework NMMA. The code allows incorporation of nuclear-physics constraints at low densities as well as X-ray and radio observations of isolated neutron stars. In previous works, the NMMA code has allowed us to constrain the equation of state of supranuclear dense matter, to measure the Hubble constant, and to compare dense-matter physics probed in neutron-star mergers and in heavy-ion collisions, and to classify electromagnetic observations and perform model selection. Here, we show an extension of the NMMA code as a first attempt of analyzing the gravitational-wave signal, the kilonova, and the gamma-ray burst afterglow simultaneously. Incorporating all available information, we estimate the radius of a $1.4 M_{⊙}$ neutron star to be $R = 11.9 8_{- 0.40}^{+ 0.35}$ km.
Comments:
code available at https://github.com/nuclear-multimessenger-astronomy
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2205.08513 [pdf]
Nature Commun.(2023)·119 citations
12
[Submitted on 17 May 2022] (cross-list from hep-lat)
New Way to Resum the Lattice QCD Taylor Series Equation of State at Finite Chemical Potential
Sabarnya Mitra🇮🇳 · Prasad Hegde🇮🇳 · Christian Schmidt🇩🇪
Taylor expansion of the thermodynamic potential in powers of the (baryo)chemical potential $μ_{B}$ is a well-known method to bypass the Sign Problem of Lattice QCD. Due to the difficulty in calculating the higher order Taylor coefficients, various alternative expansion schemes as well as resummation techniques have been suggested to extend the Taylor series to larger values of $μ_{B}$ . Recently, a way to resum the contribution of the first $N$ charge density correlation functions $D_{1}, \dots, D_{N}$ to the Taylor series to all orders in $μ_{B}$ was proposed in Phys. Rev. Lett. 128, 2, 022001 (2022). The resummation takes the form of an exponential factor. Since the correlation functions are calculated stochastically, the exponential factor contains a bias which can be significant for large $N$ and $μ_{B}$ . In this paper, we present a new method to calculate the QCD equation of state based on the well-known cumulant expansion from statistics. By truncating the expansion at a maximum order $M$ , we end up with only finite products of the correlation functions which can be evaluated in an unbiased manner. Although our formalism is also applicable for $μ_{B} \neq = 0$ , here we present it for the simpler case of a finite isospin chemical potential $μ_{I}$ for which there is no Sign Problem. We present and compare results for the pressure and the isospin density obtained using Taylor expansion, exponential resummation and cumulant expansion, and provide evidence that the absence of bias in the latter actually improves the convergence.
Comments:
References updated and manuscript revised to match the journal version
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2205.08517 [pdf]
PRD(2022)·26 citations

Affiliations

first authorsco-authorsvia INSPIRE