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Nuclear Theory·nucl-th

Monday·March 29, 2021

13 papers—7 primary·6 cross-listed

All13Primary7Cross-lists6
  1. 08

    How to build Hamiltonians that transport noncommuting charges in quantum thermodynamics

    Nicole Yunger Halpern🇺🇸 · Shayan Majidy🇨🇦

    Noncommuting conserved quantities have recently launched a subfield of quantum thermodynamics. In conventional thermodynamics, a system of interest and an environment exchange quantities -- energy, particles, electric charge, etc. -- that are globally conserved and are represented by Hermitian operators. These operators were implicitly assumed to commute with each other, until a few years ago. Freeing the operators to fail to commute has enabled many theoretical discoveries -- about reference frames, entropy production, resource-theory models, etc. Little work has bridged these results from abstract theory to experimental reality. This paper provides a methodology for building this bridge systematically: We present a prescription for constructing Hamiltonians that conserve noncommuting quantities globally while transporting the quantities locally. The Hamiltonians can couple arbitrarily many subsystems together and can be integrable or nonintegrable. Our Hamiltonians may be realized physically with superconducting qudits, with ultracold atoms, and with trapped ions.

    ↳ quant-phcond-mat.stat-mechhep-lathep-th+1npj Quantum Inf.(2022)·22 citations
  2. 09

    Proton- elastic scattering at intermediate energies

    A. Watanabe🇯🇵 · S. Nakai🇯🇵 · Y. Wada🇯🇵 · K. Sekiguchi🇯🇵 · A. Deltuva🇱🇹 · T. Akieda🇯🇵 · D. Etoh🇯🇵 · M. Inoue🇯🇵 · Y. Inoue🇯🇵 · K. Kawahara🇯🇵 · H. Kon🇯🇵 · K. Miki🇯🇵 and 33 other authors

    We present a precise measurement of the cross section, proton and analyzing powers, and spin correlation coefficient for - elastic scattering near 65 MeV, and a comparison with rigorous four-nucleon scattering calculations based on realistic nuclear potentials and a model with -isobar excitation. Clear discrepancies are seen in some of the measured observables in the regime around the cross section minimum. Theoretical predictions using scaling relations between the calculated cross section and the binding energy are not successful in reproducing the data. Large sensitivity to the potentials and rather small -isobar effects in the calculated cross section are noticed as different features from those in the deuteron-proton elastic scattering. The results obtained above indicate that - scattering at intermediate energies is an excellent tool to explore nuclear interactions not accessible by three-nucleon scattering.

    ↳ nucl-exnucl-thPRC(2021)·12 citations
  3. 10

    Three loop correction in the formation of QGP droplet

    M. Jena · K. K. Gupta · S. Somorendro Singh

    Quark-gluon plasma (QGP) droplet formation is re-considered with the addition of three loop correction to the earlier loop factors in the mean field potential. The correction of the three loop factor increases stability in the droplet formations of QGP at different parametrization factors of the QGP fluid and it is in better agreement in comparison to the lattice results of pressure, energy density and other thermodynamic relations. This implies that the contribution of the three loop enhances in showing the characteristic features of the QGP fluid. It shows that increasing the loop increased the strength of parametrization value which we defined earlier as a number parameter of fluid dynamics. It indicates that the model with the loop correction boosts in explaining about the formation of QGP droplet in the expansion of early universe

    ↳ hep-phnucl-thIndian J.Phys.(2023)·0 citations
  4. 11

    Numerical Study of Stellar Core Collapse and Neutrino Emission Using the Nuclear Equation of State Obtained by the Variational Method

    Ken'ichiro Nakazato🇯🇵 · Kohsuke Sumiyoshi🇯🇵 · Hajime Togashi🇯🇵

    Core-collapse simulations of massive stars are performed using the equation of state (EOS) based on the microscopic variational calculation with realistic nuclear forces. The progenitor models with the initial masses of , , and are adopted as examples of the ordinary core-collapse supernova with a shock stall, the low-mass supernova with a successful explosion, and the black hole formation, respectively. Moreover, the neutrinos emitted from the stellar collapse are assessed. Then, the variational EOS is confirmed to work well in all cases. The EOS dependences of the dynamics, thermal structure, and neutrino emission of the stellar collapse are also investigated.

    ↳ astro-ph.HEnucl-thPubl.Astron.Soc.Jap.(2021)·25 citations
  5. 12

    Effect of magnetic field on jet transport coefficient

    Debjani Banerjee🇮🇳 · Prottoy Das🇮🇳 · Souvik Paul🇮🇳 · Abhi Modak🇮🇳 · Ankita Budhraja🇮🇳 · Sabyasachi Ghosh🇮🇳 · Sidharth K. Prasad🇮🇳

    We report the estimation of jet transport coefficient, for quark- and gluon-initiated jets using a simple quasi-particle model in absence and presence of magnetic field. This model introduces a temperature and magnetic field-dependent degeneracy factor of partons, which is tuned by fitting the entropy density of lattice quantum chromodynamics data. At a finite magnetic field, for quark jets splits into parallel and perpendicular components whose magnetic field dependence comes from two sources: the field-dependent degeneracy factor and the phase space part guided from the shear viscosity to entropy density ratio. Due to the electrically neutral nature of gluons, the estimation of for gluon jets is affected only by the field-dependent degeneracy factor. In presence of a finite magnetic field, we find a significant enhancement in for both quark- and gluon-initiated jets at low temperature, which gradually decreases towards high temperature. We compare the obtained results with the earlier calculations based on the anti-de Sitter/conformal field theory correspondence, and a qualitatively similar trend is observed. The change in in presence of magnetic field is, however, quantitatively different for quark- and gluon-initiated jets. This is an interesting observation which can be explored experimentally to verify the effect of magnetic field on .

    ↳ hep-phhep-exnucl-exnucl-thPramana(2023)·7 citations
  6. 13

    Massive quarks in NLO dipole factorization for DIS: Longitudinal photon

    G. Beuf🇵🇱 · T. Lappi🇫🇮 · R. Paatelainen🇫🇮

    In this work, we will present the first complete calculation of the one-loop longitudinal photon-to-quark-antiquark light cone wave function, with massive quarks. The quark masses are renormalized in the pole mass scheme. The result is used to calculate the next-to-leading order correction to the high energy Deep Inelastic Scattering longitudinal structure function on a dense target in the dipole factorization framework. For massless quarks the next-to-leading order correction was already known to be sizeable, and our result makes it possible to evaluate it also for massive quarks.

    ↳ hep-phnucl-thPRD(2021)·61 citations

Affiliations

first authorsco-authorsvia INSPIRE