Nuclear Theory·nucl-th

Tuesday·March 7, 2023

15 papers—7 primary·8 cross-listed

08
[Submitted on 3 Mar 2023] (cross-list from hep-ph)
Investigating the impact of spin effects at the high-energy neutrino-nucleon interactions while it crosses the Earth's core
R. Francener🇧🇷 · D.R. Gratieri🇧🇷 · G. Torrieri🇧🇷
In this work, we investigate the impact of assuming the polarization of the Earth's outer core on the propagation of neutrinos that cross the all the Earth. We taking into account the spin-dependent structure functions to describe the polarized neutrino-nucleon cross-section, and also on the neutrino absorption while it crosses all of the Earth. We found that adding spin information and simultaneously assuming polarization of Earth's outer core impacts the probability of neutrino absorption in the energy range of 10 - 100 TeV and for upward neutrino direction. However, the magnitude of the effect is small and should be comparable with the magnitude of the errors associated with the IceCube neutrino data.
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2303.01915 [pdf]
1 citation
09
[Submitted on 3 Mar 2023] (cross-list from hep-ph)
Bayesian uncertainty quantification of perturbative QCD input to the neutron-star equation of state
Tyler Gorda🇩🇪 · Oleg Komoltsev🇳🇴 · Aleksi Kurkela🇳🇴 · Aleksas Mazeliauskas🇩🇪
The equation of state of neutron-star cores can be constrained by requiring a consistent connection to the perturbative Quantum Chromodynamics (QCD) calculations at high densities. The constraining power of the QCD input depends on uncertainties from missing higher-order terms, the choice of the unphysical renormalization scale, and the reference density where QCD calculations are performed. Within a Bayesian approach, we discuss the convergence of the perturbative QCD series, quantify its uncertainties at high densities, and present a framework to systematically propagate the uncertainties down to neutron-star densities. We find that the effect of the QCD input on the neutron-star inference is insensitive to the various unphysical choices made in the uncertainty estimation.
Comments:
Version 2 - published version, minor changes. 12 pages, 10 figs
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2303.02175 [pdf]
JHEP(2023)·50 citations
10
[Submitted on 4 Mar 2023] (cross-list from quant-ph)
Quantum Computation of Phase Transition in Interacting Scalar Quantum Field Theory
Shane Thompson🇺🇸 · George Siopsis🇺🇸
It has been demonstrated that the critical point of the phase transition in scalar quantum field theory with a quartic interaction in one space dimension can be approximated via a Gaussian Effective Potential (GEP). We discuss how this critical point can be estimated using quantum hardware. We perform quantum computations with various lattice sizes and obtain evidence of a transition from a symmetric to a symmetry-broken phase. We use both discrete- and continuous-variable quantum computation. We implement the ten-site case on IBM quantum hardware using the Variational Quantum Eigensolver (VQE) algorithm to minimize the GEP and identify lattice level-crossings. These are extrapolated via simulations to find the continuum critical point.
Comments:
21 pages, 17 figures
Subjects:
Quantum Physics (quant-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2303.02425 [pdf]
Quant.Inf.Proc.(2023)·7 citations
11
[Submitted on 5 Mar 2023] (cross-list from hep-ph)
The Present and Future of QCD
P. Achenbach · D. Adhikari · A. Afanasev · F. Afzal · C.A. Aidala · A. Al-bataineh · D.K. Almaalol · M. Amaryan · D. Androić · W.R. Armstrong · M. Arratia · J. Arrington and 391 other authors
This White Paper presents the community inputs and scientific conclusions from the Hot and Cold QCD Town Meeting that took place September 23-25, 2022 at MIT, as part of the Nuclear Science Advisory Committee (NSAC) 2023 Long Range Planning process. A total of 424 physicists registered for the meeting. The meeting highlighted progress in Quantum Chromodynamics (QCD) nuclear physics since the 2015 LRP (LRP15) and identified key questions and plausible paths to obtaining answers to those questions, defining priorities for our research over the coming decade. In defining the priority of outstanding physics opportunities for the future, both prospects for the short (~ 5 years) and longer term (5-10 years and beyond) are identified together with the facilities, personnel and other resources needed to maximize the discovery potential and maintain United States leadership in QCD physics worldwide. This White Paper is organized as follows: In the Executive Summary, we detail the Recommendations and Initiatives that were presented and discussed at the Town Meeting, and their supporting rationales. Section 2 highlights major progress and accomplishments of the past seven years. It is followed, in Section 3, by an overview of the physics opportunities for the immediate future, and in relation with the next QCD frontier: the EIC. Section 4 provides an overview of the physics motivations and goals associated with the EIC. Section 5 is devoted to the workforce development and support of diversity, equity and inclusion. This is followed by a dedicated section on computing in Section 6. Section 7 describes the national need for nuclear data science and the relevance to QCD research.
Comments:
QCD Town Meeting White Paper, as submitted to 2023 NSAC LRP committee on Feb. 28, 2023
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2303.02579 [pdf]
NPA(2024)·135 citations
12
[Submitted on 5 Mar 2023] (cross-list from cond-mat.quant-gas)
On-shell approximation for the s-wave scattering theory
F. Lorenzi · A. Bardin · L. Salasnich
We investigate the scattering theory of two particles in a generic $D$ -dimensional space. For the s-wave problem, by adopting an on-shell approximation for the $T$ -matrix equation, we derive analytical formulas which connect the Fourier transform $V ~ (k)$ of the interaction potential to the s-wave phase shift. In this way we obtain explicit expressions of the low-momentum parameters $g ~_{0}$ and $g ~_{2}$ of $V ~ (k) = g ~_{0} + g ~_{2} k^{2} + ...$ in terms of the s-wave scattering length $a_{s}$ and the s-wave effective range $r_{s}$ for $D = 3$ , $D = 2$ , and $D = 1$ . Our results, which are strongly dependent on the spatial dimension $D$ , are a useful benchmark for few-body and many-body calculations. As a specific application, we derive the zero-temperature pressure of a 2D uniform interacting Bose gas with a beyond-mean-field correction which includes both scattering length and effective range.
Comments:
8 pages, 2 figures, 1 table, accepted for publication in Phys. Rev. A
Subjects:
Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
arXiv:
2303.02675 [pdf]
PRA(2023)·8 citations
13
[Submitted on 6 Mar 2023] (cross-list from hep-ph)
Gluons, light and heavy quarks and their interactions in the instanton vacuum
Mirzayusuf Musakhanov🇺🇿
The instanton size $ρ$ and inter-instanton distance $R$ are the main parameters of Instanton Liquid Model (ILM) of the QCD vacuum. Various estimates show that $ρ \approx 1/3$ fm and $R \approx 1$ fm, and the corresponding packing parameter $κ = ρ^{4} / R^{4} \approx 0.01$ . The strength of the light quark-instanton interaction is sizable and close to that of the gluon-instanton one since the dynamical light quark mass $M_{q}$ and dynamical gluon mass $M_{g}$ are given by $M_{q} \approx M_{g} \approx 360$ MeV $\sim κ^{1/2} ρ^{- 1}$ . On the other hand, the strength of the heavy quark-instanton interaction is weak - the direct instanton contribution to the heavy quark mass $Δ M_{Q}^{dir} \approx 70$ MeV $\sim κ ρ^{- 1} .$ The instantons are responsible for mutual interactions among colored particles which are crossing the field of the same instanton, like t'Hooft-like interactions of $N_{f}$ light quarks ( $N_{f}$ is the light quark flavors number). The light quark propagators in the instanton field have zero modes, which give dominant contributions. Within ILM we are able to derive the light quarks determinants and the light quarks partition function. These tools perfectly describe the light quark physics and its most important and basic phenomena - the spontaneous breaking of the chiral symmetry (SBChS) in details. These one allows us to find the properties of light and heavy quarks interactions and get SBChS traces in light-heavy and heavy-heavy quarks systems. So, we need to find heavy $Q Q ˉ$ quarkonia spectra and their wave functions. Here we have interplay of two scales: short ( $\sim (M_{Q} v)^{- 1} \leq 0.15$ fm) perturbative QCD and large ( $\sim (M_{Q} v^{2})^{- 1} \sim 0.5$ fm) nonperturbative QCD scales, where $v$ is the velocity in $Q Q ˉ$ . We calculate the heavy quarks correlators with perturbative corrections within ILM.
Comments:
arXiv admin note: text overlap with arXiv:2103.16628
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2303.03061 [pdf]
2 citations
14
[Submitted on 6 Mar 2023] (cross-list from hep-ph)
Impact of nonextensivity on the transport coefficients of a magnetized hot and dense QCD matter
Shubhalaxmi Rath🇮🇳 · Sadhana Dash🇮🇳
We have studied the impact of the nonextensivity on the transport coefficients related to charge and heat in thermal QCD. For this purpose, the electrical ( $σ_{el}$ ), Hall ( $σ_{H}$ ), thermal ( $κ$ ) and Hall-type thermal ( $κ_{H}$ ) conductivities are determined using the kinetic theory approach in association with the nonextensive Tsallis statistical mechanism. The effect of nonextensivity is encoded in the nonextensive Tsallis distribution function, where the deviation of the parameter $q$ from 1 signifies the degree of nonextensivity in the concerned system. The thermal and electrical conductivities are found to increase with the introduction of nonextensivity, which means that the deviation of the medium from thermal equilibrium enhances both charge and heat transports. With the magnetic field, the deviations of $σ_{el}$ , $σ_{H}$ , $κ$ and $κ_{H}$ from their respective equilibrated values increase, whereas these deviations decrease with the chemical potential. We have also studied how the extent of the nonextensivity modulates the longevity of magnetic field. Present work is further extended to the study of some observables associated with the aforesaid transport phenomena, such as the Knudsen number and the elliptic flow within the nonextensive Tsallis framework.
Comments:
24 pages, 7 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2303.03071 [pdf]
EPJC(2023)·12 citations
15
[Submitted on 6 Mar 2023] (cross-list from astro-ph.HE)
Neutron star mass-radius constraints using the high-frequency QPOs of GRB 200415A
H. Sotani · K. D. Kokkotas · N. Stergioulas
Quasi-periodic oscillations (QPOs) observed in a giant flare of a strongly magnetized neutron star (magnetar), are carrying crucial information for extracting the neutron star properties. The aim of the study is to constrain the mass and radius of the neutron star model for GRB 200415A, by identifying the observed QPOs with the crustal torsional oscillations together with the experimental constraints on the nuclear matter properties. The frequencies of the crustal torsional oscillations are determined by solving the eigenvalue problem with the Cowling approximation, assuming a magnetic field of about $1 0^{15}$ G. We find that the observed QPOs can be identified with several overtones of crustal oscillations, for carefully selected combinations of the nuclear saturation parameters. Thus, we can inversely constrain the neutron star mass and radius for GRB 200415A by comparing them to the values of nuclear saturation parameters obtained from terrestrial experiments. We impose further constraints on the neutron star mass and radius while the candidate neutron star models are consistent with the constraints obtained from other available astronomical and experimental observations.
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2303.03150 [pdf]
Astron.Astrophys.(2023)·24 citations

Affiliations

first authorsco-authorsvia INSPIRE