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Nuclear Theory·nucl-th

Wednesday·February 8, 2023

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 06

    Carrollian Origins of Bjorken Flow

    Arjun Bagchi🇮🇳 · Kedar S. Kolekar🇮🇳 · Ashish Shukla🇫🇷

    Bjorken flow is among the simplest models of fluids moving near the speed of light () while Carroll symmetry arises as a contraction of Poincaré group when . We show that Bjorken flow and its phenomenological approximations are completely captured by Carrollian fluids. Carrollian symmetries arise on generic null surfaces and a fluid moving at is restricted to such a surface, thereby naturally inheriting the symmetries. Carrollian hydrodynamics is thus not exotic, but rather ubiquitous, and provides a concrete framework for fluids moving at or near the speed of light.

    ↳ hep-thhep-phnucl-thPRL(2023)·68 citations
  2. 07

    The Fractional Schrodinger Equation with the Generalized Woods-Saxon Potential

    M. Abu-Shady · Etido P. Inyang

    The bound state energy eigenvalues and the corresponding eigenfunctions of the generalized Woods-Saxon potential reported in [Phys. Rev. C 72, 027001 (2005)] is extended to the fractional forms using the generalized fractional derivative and the fractional Nikiforov-Uvarov (NU) technique. Analytical solutions of bound states of the Schrodinger equation for the present potential are obtained in the terms of fractional Jacobi polynomials. It is demonstrated that the classical results are a special case of the present results at Elfa=Beta=1 Therefore, the present results play important role in molecular chemistry and nuclear physics.

    ↳ quant-phnucl-thEast Eur.J.Phys.(2023)·6 citations
  3. 08

    Enhancement of dilepton production rate and electric conductivity around QCD critical point

    Toru Nishimura🇯🇵 · Masakiyo Kitazawa🇯🇵 · Teiji Kunihiro🇯🇵

    We investigate whether the soft mode that becomes massless at the QCD critical point (CP) causes an enhancement of the dilepton production rate (DPR) and the electric conductivity around the CP through the modification of the photon self-energy. The modification is described by the so-called Aslamazov-Larkin, Maki-Thompson and density of states terms, which have been taken into account in our previous study on the DPR near the color-superconducting phase transition, with a replacement of the diquark modes with the soft mode of the QCD CP. We show that the coupling of photons with the soft modes brings about an enhancement of the DPR in the low invariant-mass region and the conductivity near the CP, which would be observable in the relativistic heavy-ion collisions.

    ↳ hep-phnucl-exnucl-thPTEP(2023)·13 citations
  4. 09

    Thermal fading of the -tail of the momentum distribution induced by the hole anomaly

    Giulia De Rosi · Grigori E. Astrakharchik · Maxim Olshanii · Jordi Boronat

    We study the thermal behavior of correlations in a one-dimensional Bose gas with tunable interaction strength, crossing from weakly-repulsive to Tonks-Girardeau regime. A reference temperature in this system is that of the hole anomaly, observed as a peak in the specific heat and a maximum in the chemical potential. We find that at large momenta and temperature above the anomaly threshold, the tail of the momentum distribution (proportional to the Tan contact ) is screened by the -term due to a dramatic thermal increase of the internal energy emerging from the thermal occupation of spectral excitation states. The same fading is consistently revealed in the behavior at short distances of the one-body density matrix (OBDM) where the -dependence disappears for temperatures above the anomaly. We obtain a new general analytic tail for the momentum distribution and a minimum fixing its validity range, both calculated with exact Bethe-Ansatz method and valid in all interaction and thermal regimes, crossing from the quantum to the classical gas limit. Our predictions are confirmed by comparison with ab-initio Path Integral Monte Carlo calculations for the momentum distribution and the OBDM exploring a wide range of interaction strength and temperature. Our results unveil a novel connection between excitations and correlations. We expect them to be of interest to any cold atomic, nuclear, solid-state, electronic and spin system exhibiting an anomaly or a thermal second-order phase transition.

    ↳ cond-mat.quant-gascond-mat.othernucl-thphysics.atom-ph+1PRA(2024)·7 citations
  5. 10

    Nuclear shell-model simulation in digital quantum computers

    A. Pérez-Obiol🇪🇸 · A. M. Romero🇪🇸 · J. Menéndez🇪🇸 · A. Rios🇪🇸 · A. García-Sáez🇪🇸 · B. Juliá-Díaz🇪🇸

    The nuclear shell model is one of the prime many-body methods to study the structure of atomic nuclei, but it is hampered by an exponential scaling on the basis size as the number of particles increases. We present a shell-model quantum circuit design strategy to find nuclear ground states by exploiting an adaptive variational quantum eigensolver algorithm. Our circuit implementation is in excellent agreement with classical shell-model simulations for a dozen of light and medium-mass nuclei, including neon and calcium isotopes. We quantify the circuit depth, width and number of gates to encode realistic shell-model wavefunctions. Our strategy also addresses explicitly energy measurements and the required number of circuits to perform them. Our simulated circuits approach the benchmark results exponentially with a polynomial scaling in quantum resources for each nucleus. This work paves the way for quantum computing shell-model studies across the nuclear chart and our quantum resource quantification may be used in configuration-interaction calculations of other fermionic systems.

    ↳ quant-phnucl-thSci.Rep.(2023)·67 citations

Affiliations

first authorsco-authorsvia INSPIRE