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Nuclear Theory·nucl-th

Thursday·July 18, 2024

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    BCS-BEC crossover of the strongly interacting Li-K mixture

    Stefano Gandolfi · Ryan Curry · Alexandros Gezerlis

    We present Quantum Monte Carlo calculations of the properties of a two-component mass imbalanced Fermi gas, corresponding to the Li-K mixture. We compute the equation of state of the unpolarized system as a function of the scattering length with particular attention paid to the unitary limit, where the effect of the effective range of the interaction is explored. We have also computed the pair distribution function and the momentum distribution over a range of interaction strengths to provide information about the structure of the system. Finally, we have computed the heavy/light quasiparticle spectrum. Our theoretical predictions, based on Quantum Monte Carlo calculations, can be tested by future experiments with ultracold fermionic gases.

    ↳ cond-mat.quant-gasnucl-thPRA(2024)·4 citations
  2. 05

    Spin polarization of fermions at local equilibrium: Second-order gradient expansion

    Xin-Li Sheng🇮🇹 · Francesco Becattini🇮🇹 · Xu-Guang Huang🇨🇳 · Zhong-Hua Zhang🇨🇳

    We present a calculation of the spin polarization of spin-1/2 fermions in a relativistic fluid at local thermodynamic equilibrium at the second order in the gradient expansion, including second-order derivatives. The second-order derivative terms vanish if the local equilibrium hypersurface is the hyperplane in the collision center-of-mass frame. However, since the freeze-out hypersurface has a non-trivial space-time structure, these terms may result in a non-vanishing contribution to the spin polarization, whose magnitude needs to be assessed with numerical computations.

    ↳ hep-thhep-phnucl-thPRC(2024)·12 citations
  3. 06

    Review of nonflow estimation methods and uncertainties in relativistic heavy-ion collisions

    Yicheng Feng🇺🇸 · Fuqiang Wang🇺🇸

    Collective anisotropic flow, where particles are correlated over the entire event, is a prominent phenomenon in relativistic heavy-ion collisions and is sensitive to the properties of the matter created in those collisions. It is often measured by two- and multi-particle correlations and is therefore contaminated by nonflow, those genuine few-body correlations unrelated to the global event-wise correlations. Many methods have been devised to estimate nonflow contamination with various degrees of successes and difficulties. Here, we review those methods pedagogically, discussing the pros and cons of each method, and give examples of ballpark estimate of nonflow contamination and associated uncertainties in relativistic heavy-ion collisions. We hope such a review of the various nonflow estimation methods in a single place would prove helpful to future researches.

    ↳ nucl-exnucl-thJ.Phys.G(2025)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE