Nuclear Theory·nucl-th

Tuesday·July 21, 2020

22 papers—12 primary·10 cross-listed

13
[Submitted on 17 Jul 2020] (cross-list from hep-th)
Fluctuating Relativistic hydrodynamics from Crooks theorem
Giorgio Torrieri🇧🇷
We use the Crooks fluctuation theorem together with Zubarev hydrodynamics to develop a bottom-up theory of hydrodynamic fluctuations. We also use thermodynamic uncertainity relations to estimate bottom-up limits to dissipative transport coefficients.
Comments:
Small typos fixed in accordance to proofs
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th); Fluid Dynamics (physics.flu-dyn)
arXiv:
2007.09224 [pdf]
JHEP(2021)·22 citations
14
[Submitted on 19 Jul 2020] (cross-list from astro-ph.HE)
Confronting GW190814 with hyperonization in dense matter and hypernuclear compact stars
Armen Sedrakian🇩🇪 · Fridolin Weber🇺🇸 · Jia-Jie Li🇩🇪
We examine the possibility that the light companion in the highly asymmetric binary compact object coalescence event GW190814 is a hypernuclear star. We use density functional theory with functionals that have been tuned to the properties of $Λ$ hypernuclei as well as astrophysical constraints placed by the masses of the most massive millisecond pulsars, the mass-radius range inferred from the NICER experiment, and the binary neutron star merger event GW170817. We compute general-relativistic static and maximally rotating Keplerian configurations of purely nucleonic and hypernuclear stars. We find that while nucleonic stars are broadly consistent with a neutron star being involved in GW190814, this would imply no new degrees of freedom in the dense matter up to 6.5 times the nuclear saturation density. Allowing for hyperonization of dense matter, we find that the maximal masses of hypernuclear stars, even for maximal rapidly rotating configurations, are inconsistent with a stellar nature interpretation of the light companion in GW190814, implying that this event involved two black holes rather than a neutron star and a black hole.
Comments:
5 pages, 4 figures; v2: minor editorial improvements, matches published version
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2007.09683 [pdf]
PRD(2020)·79 citations
15
[Submitted on 19 Jul 2020] (cross-list from hep-ph)
Updated analysis of jet quenching at RHIC and LHC within the light cone path integral approach
B.G. Zakharov🇷🇺
We present results of a detailed analysis of experimental data on the nuclear modification factor $R_{AA}$ and the flow coefficient $v_{2}$ for light hadrons from RHIC for $0.2$ TeV Au+Au collisions and from LHC for $2.76$ and $5.02$ TeV Pb+Pb, and $5.44$ TeV Xe+Xe collisions. We perform calculations within the light-cone path integral approach to induced gluon emission. We use running $α_{s}$ which is frozen at low momenta at some value $α_{s}^{f r}$ . We find that the RHIC data support somewhat larger value of $α_{s}^{f r}$ . For the $χ^{2}$ optimized values of $α_{s}^{f r}$ , the theoretical predictions are in reasonable agreement with data on $R_{AA}$ and $v_{2}$ . Calculations made for different formation times and life-times of the QGP show that jet quenching at the RHIC and LHC energies is only weakly sensitive to the initial and final stages of the QCD matter evolution.
Comments:
26 pages, 12 figures. Accepted in J.Phys. G
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2007.09772 [pdf]
J.Phys.G(2021)·11 citations
16
[Submitted on 20 Jul 2020] (cross-list from hep-th)
Complexified quasinormal modes and the pole-skipping in a holographic system at finite chemical potential
Navid Abbasi🇨🇳 · Sara Tahery🇨🇳
We develop a method to study coupled dynamics of gauge-invariant variables, constructed out of metric and gauge field fluctuations on the background of a AdS $_{5}$ Reissner-Nordström black brane. Using this method, we compute the numerical spectrum of quasinormal modes associated with fluctuations of spin 0, 1 and 2, non-perturbatively in $μ / T$ . We also analytically compute the spectrum of hydrodynamic excitations in the small chemical potential limit. Then, by studying the spectral curve at complex momenta in every spin channel, we numerically find points at which hydrodynamic and non-hydrodynamic poles collide. We discuss the relation between such collision points and the convergence radius of the hydrodynamic derivative expansion. Specifically in the spin 0 channel, we find that within the range $1.1 ≲ μ / T ≲ 2$ , the radius of convergence of the hydrodynamic sound mode is set by the absolute value of the complex momentum corresponding to the point at which the sound pole collides with the hydrodynamic diffusion pole. It shows that in holographic systems at finite chemical potential, the convergence of the hydrodynamic derivative expansion in the mentioned range is fully controlled by hydrodynamic information. As the last result, we explicitly show that the relevant information about quantum chaos in our system can be extracted from the pole-skipping points of energy density response function. We find a threshold value for $μ / T$ , lower than which the pole-skipping points can be computed perturbatively in a derivative expansion.
Comments:
48 pages, 15 figures, 1 table. v2: minor corrections, references added, in the Section 3 more details of the computation mentioned in Pages 9-10. V3: minor corrections, Figures 13 and 17 added, subsection 5.3 added, Appendices C, D, E and H added, journal version
Subjects:
High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2007.10024 [pdf]
JHEP(2020)·82 citations
17
[Submitted on 20 Jul 2020] (cross-list from nucl-ex)
Prompt-delayed $γ$ -ray spectroscopy of neutron-rich $^{119, 121}$ In isotopes
S. Biswas🇫🇷 · A. Lemasson🇫🇷 · M. Rejmund🇫🇷 · A. Navin🇫🇷 · Y.H. Kim🇫🇷 · C. Michelagnoli🇫🇷 · I. Stefan🇫🇷 · R. Banik🇮🇳 · P. Bednarczyk🇵🇱 · Soumik Bhattacharya🇮🇳 · S. Bhattacharyya🇮🇳 · E. Clément🇫🇷 and 14 other authors
The fusion and transfer induced fission reaction $^{9}$ Be( $^{238}$ U,~f) with 6.2 MeV/u beam energy, using a unique setup consisting of AGATA, VAMOS++ and EXOGAM detectors, was used to populate through the fission process and study the neutron-rich $^{119, 121}$ In isotopes. This setup enabled the prompt-delayed $γ$ -ray spectroscopy of isotopes in the time range of $100 ns - 200 μ s$ . In the odd- $A$ $^{119, 121}$ In isotopes, indications of a short half-life $19/ 2^{-}$ isomeric state, in addition to the previously known $25/ 2^{+}$ isomeric state, were observed from the present data. Further, new prompt transitions above the $25/ 2^{+}$ isomer in $^{121}$ In were identified along with reevaluation of its half-life. The experimental data were compared with the theoretical results obtained in the framework of large-scale shell-model calculations in a restricted model space. The $⟨ π g_{9/2} ν h_{11/2}; I \arrowvert H^\arrowvert π g_{9/2} ν h_{11/2}; I ⟩$ two-body matrix elements of residual interaction were modified to explain the excitation energies and the $B (E 2)$ transition probabilities in the neutron-rich In isotopes. The (i) decreasing trend of $E (29/ 2^{+}) - E (25/ 2^{+})$ in odd-In (with dominant configuration $π g_{9/2}^{- 1} ν h_{11/2}^{- 2}$ and maximum aligned spin of $29/ 2^{+}$ ) and (ii) increasing trend of $E (27/ 2^{+}) - E (23/ 2^{+})$ in odd-Sb (with dominant configuration $π g_{7/2}^{+ 1} ν h_{11/2}^{- 2}$ and maximum aligned spin of $27/ 2^{+}$ ) with increasing neutron number could be understood as a consequence of hole-hole and particle-hole interactions, respectively.
Comments:
Accepted for publication in Phys. Rev. C
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2007.10043 [pdf]
PRC(2020)·4 citations
18
[Submitted on 20 Jul 2020] (cross-list from physics.hist-ph)
Misconceptions on Effective Field Theories and spontaneous symmetry breaking: Response to Ellis' article
Thomas Luu🇩🇪 · Ulf-G. Meißner🇩🇪
In an earlier paper~\cite{Luu:2019jmb} we discussed emergence from the context of effective field theories, particularly as related to the fields of particle and nuclear physics. We argued on the side of reductionism and weak emergence. George Ellis has critiqued our exposition in~\cite{Ellis:2020vij}, and here we provide our response to his critiques. Many of his critiques are based on incorrect assumptions related to the formalism of effective field theories and we attempt to correct these issues here. We also comment on other statements made in his paper. Important to note is that our response is to his critiques made in archive versions arXiv:2004.13591v1-5 [physics.hist-ph]. That is, versions 1-5 of this archive post. Version 6 has similar content as versions 1-5, but versions 7-9 are seemingly a different paper altogether (even with a different title).
Comments:
15 pages, link in abstract corrected
Subjects:
History and Philosophy of Physics (physics.hist-ph); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2007.10062 [pdf]
Found.Phys.(2020)·0 citations
19
[Submitted on 20 Jul 2020] (cross-list from hep-ph)
Anisotropy fluctuation and correlation in central $α$ -clustered $^{12}$ C+ $^{197}$ Au collisions
L. Ma. Y. G. Ma · S. Zhang
In the framework of a multi-phase transport model, fluctuation and correlation of the azimuthal anisotropies in $^{12}$ C+ $^{197}$ Au collisions at $S_{N N}$ = 200 GeV are explored. Properties of the initial eccentricity and final harmonic flow fluctuation resulted from $^{12}$ C+ $^{197}$ Au collisions with Woods-Saxon configuration and triangular $α$ -clustering configurations of $^{12}$ C are investigated via scaled variance, skewness and kurtosis. Comparisons are made between results from $α$ -clustered configurations and Woods-Saxon configuration. The triangular flow fluctuation is found to have particular sensitivity in distinguishing triangular $α$ -clustering structure of $^{12}$ C. Furthermore, correlations between initial eccentricities and final flow harmonics are studied with strong multiplicity dependence observed for the correlation functions.
Comments:
9 figures, 10 pages
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2007.10063 [pdf]
PRC(2020)·22 citations
20
[Submitted on 20 Jul 2020] (cross-list from astro-ph.HE)
Constraining dense matter physics using f-mode oscillations in neutron stars
Sukrit Jaiswal · Debarati Chatterjee
In this undergraduate project, f-mode oscillations in neutron stars are used to constrain the equation of state of dense matter. For the first time, a systematic investigation of the role of nuclear saturation parameters on the mode oscillations is performed. It is found that the uncertainty in the determination of effective nucleon mass plays the most significant role in controlling the f-mode frequencies. Correlations of the frequencies with astrophysical observables relevant for asteroseismology are also investigated. Future detection of f-mode frequencies could then provide a unique way of constraining nuclear empirical parameters and therefore the behaviour of dense matter.
Comments:
18 pages, 18 figures
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2007.10069 [pdf]
MDPI Physics(2021)·15 citations
21
[Submitted on 20 Jul 2020] (cross-list from hep-lat)
Lattice QCD constraints on the heavy quark diffusion coefficient
Nora Brambilla🇩🇪 · Viljami Leino🇩🇪 · Peter Petreczky🇺🇸 · Antonio Vairo🇩🇪
We report progress towards computing the heavy quark momentum diffusion coefficient from the correlator of two chromo-electric fields attached to a Polyakov loop in pure SU(3) gauge theory. Using a multilevel algorithm and tree-level improvement, we study the behavior of the diffusion coefficient as a function of temperature in the wide range $1.1 < T / T_{c} < 1 0^{4}$ in order to compare it to perturbative expansions at high temperature. We find that within errors the lattice results are remarkably compatible with the next-to-leading order perturbative result.
Comments:
16 pages, 18 figures, v2: updated to match published version
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2007.10078 [pdf]
PRD(2020)·120 citations
22
[Submitted on 20 Jul 2020] (cross-list from hep-ph)
Bottomonium suppression and elliptic flow from real-time quantum evolution
Ajaharul Islam🇺🇸 · Michael Strickland🇺🇸
We compute the suppression and elliptic flow of bottomonium using real-time solutions to the Schrödinger equation with a realistic in-medium complex-valued potential. To model the initial production, we assume that, in the limit of heavy quark masses, the wave-function can be described by a lattice-smeared (Gaussian) Dirac delta wave-function. The resulting final-state quantum-mechanical overlaps provide the survival probability of all bottomonium eigenstates. Our results are in good agreement with available data for $R_{AA}$ as a function of $N_{part}$ and $p_{T}$ collected at $s_{NN} =$ 5.02 TeV. In the case of $v_{2}$ for the various states, we find that the path-length dependence of $Υ (1 s)$ suppression results in quite small $v_{2}$ for $Υ (1 s)$ . Our prediction for the integrated elliptic flow for $Υ (1 s)$ in the $10 - 90$ % centrality class is $v_{2} [Υ (1 s)] = 0.0026 \pm 0.0007$ . We additionally find that, due to their increased suppression, excited bottomonium states have a larger elliptic flow and we make predictions for $v_{2} [Υ (2 s)]$ and $v_{2} [Υ (3 s)]$ as a function of centrality and transverse momentum. Similar to prior studies, we find that it is possible for bottomonium states to have negative $v_{2}$ at low transverse momentum.
Comments:
10 pages, 8 figures, 1 table; published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2007.10211 [pdf]
PLB(2020)·42 citations

Affiliations

first authorsco-authorsvia INSPIRE