Nuclear Theory·nucl-th

Thursday·March 6, 2025

7 papers—4 primary·3 cross-listed

05
Relativistic Navier-Stokes description of the quark-gluon plasma radial flow
Yago Bea🇪🇸
The relativistic viscous hydrodynamic description of the quark-gluon plasma by Müller-Israel-Stewart formulations has been very successful, but despite this success, these theories present limitations regarding well-posedness and causality. In recent years, a well-behaved version of the relativistic Navier-Stokes equations has been formulated, appearing as a promising alternative in which those limitations are absent. Using this novel theory, we perform numerical simulations of a quark-gluon plasma fluid that we use to describe experimental data on the transverse momentum distribution of hadrons from central Pb-Pb collisions measured at the LHC.
↳ hep-phhep-thnucl-th8 citations
06
Quantum Magic in Quantum Electrodynamics
Qiaofeng Liu🇺🇸 · Ian Low🇺🇸 · Zhewei Yin🇺🇸
In quantum computing, non-stabilizerness -- the magic -- refers to the computational advantage of certain quantum states over classical computers and is an essential ingredient for universal quantum computation. Employing the second order stabilizer Rényi entropy to quantify magic, we study the production of magic states in Quantum Electrodynamics (QED) via 2-to-2 scattering processes involving electrons and muons. Considering all 60 stabilizer initial states, which have zero magic, the angular dependence of magic produced in the final states is governed by only a few patterns, both in the non-relativistic and the ultra-relativistic limits. Some processes, such as the low-energy $e^{-} μ^{-} \to e^{-} μ^{-}$ and Bhabha scattering $e^{-} e^{+} \to e^{-} e^{+}$ , do not generate magic at all. In most cases the largest magic generated is significantly less than the maximal possible value of $lo g (16/7) \approx 0.827$ . The only instance where QED is able to generate maximal magic is the low-energy $μ^{-} μ^{+} \to e^{-} e^{+}$ , in the limit $m_{e} / m_{μ} \to 0$ , which is well approximated in nature. Our results suggest QED, although capable of producing maximally entangled states easily, may not be an efficient mechanism for generating quantum advantages.
↳ quant-phcond-mat.stat-mechhep-phhep-th+1PRD(2026)·39 citations
07
Holographic derivation of effective action for a dissipative neutral fluid
Yanyan Bu🇨🇳 · Xiyang Sun🇨🇳
Using a holographic prescription for the Schwinger-Keldysh closed time path, we derive the effective action for a dissipative neutral fluid holographically described by the Einstein gravity in an asymptotic AdS spacetime. In the saddle point approximation for the dual gravity, the goal is achieved by solving the double Dirichlet problem for the linearized gravitational field living in a complexified static AdS black brane background. We adopt a partially on-shell scheme for solving the bulk dynamics, which is equivalent to ``integrating out'' the gapped modes in the boundary field theory. The boundary effective action in the fluid spacetime, identified as the partially on-shell bulk action, is computed to first order in boundary derivative and to cubic order in AdS boundary data. The boundary effective action, rewritten in the physical spacetime, successfully reproduces various results known in the framework of classical hydrodynamics, confirming our holographic derivation.
↳ hep-thhep-phnucl-thJHEP(2025)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE

Relativistic Navier-Stokes description of the quark-gluon plasma radial flow

Quantum Magic in Quantum Electrodynamics

Holographic derivation of effective action for a dissipative neutral fluid

Affiliations