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Nuclear Theory·nucl-th

Thursday·May 21, 2026

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    Quantum Simulation of Gauge Theories for Particle and Nuclear Physics

    Zohreh Davoudi🇺🇸

    Lattice field theory, along with its algorithmic and hardware ecosystems, has been at the forefront of computational particle and nuclear physics. It continues to deliver impressive results on the hadronic spectrum, structure, decays, and reactions. Yet, this vigorous campaign has fallen short in addressing a range of problems involving dense matter and general dynamical phenomena. The reason is that such problems require an exponential scaling of computing time and space in system size. Quantum simulation, enabled by quantum-computing algorithms and hardware technology, promises a way forward by offering several polynomially efficient algorithms compared with their inefficient classical counterparts. Lattice gauge theorists have engaged in a multi-pronged program to leverage such new possibilities, and have steadily advanced the state of theory, algorithm, and hardware implementations and co-design. In this talk, I motivate the quantum-computational lattice-field-theory program; introduce the questions such a program is expected to address and the strategies it involves; report on recent progress; and end with a note on challenges and opportunities ahead.

    ↳ hep-lathep-phnucl-thquant-ph3 citations
  2. 05

    Entangling Power: A Probe of Symmetry and Integrability in Quantum Many-Body Systems

    Ian Low🇺🇸 · Pallab Goswami🇺🇸

    The entangling power of a unitary operator quantifies its ability to generate entanglement from product states and provides a natural probe of quantum many-body dynamics. Entanglement extremization at points of enhanced symmetry has previously been observed in high-energy scattering. In this work we compute the time-averaged entangling power of anisotropic Heisenberg spin chains across two-site models and finite-size systems, as well as the entangling power of the two-magnon -matrix in the thermodynamic limit. For two-site models we establish a monotonic hierarchy: the entangling power decreases as the symmetry group grows, reaching its minimum at the XXX point. Finite-size XXZ chains exhibit sharp dips at the points and the free-fermion point , with the free-fermion dip decaying much more slowly with system size. In the thermodynamic limit, we decompose the two-magnon -matrix into quantum logic gates -- Identity, SWAP, and -- and show that the entangling power vanishes for all scattering energies at the points, where the -matrix reduces to the Identity gate, while the free-fermion point achieves the maximum -- the opposite of the finite-size many-body behavior. The entangling power can serve as an {\em operator} diagnostic for symmetry and selected aspects of integrability in quantum simulations of spin-chain dynamics.

    ↳ quant-phcond-mat.str-elhep-phhep-th+14 citations
  3. 06

    Superfluid fraction in the crystalline crust of a neutron star: role of quantum zero-point motion of ions

    Nicolas Chamel

    The suppression of the neutron superfluid fraction in the inner crust of a cold neutron star is mitigated by the quantum zero-point motion of ions about their equilibrium position. In turn, the crustal dynamics is altered by the presence of the neutron superfluid. These effects are studied self-consistently to assess the validity of the usual assumption of a perfect rigid lattice. To this end, fully three-dimensional band-structure calculations of the superfluid fraction are carried out in the weak-coupling approximation, considering body- and face-centered cubic lattices. In both cases, the superfluid fraction is still found to be strongly suppressed in the intermediate region of the inner crust. In turn, the effective mass of the ions is dramatically increased, thus further damping the ion fluctuations. These results are of relevance for the rotational and thermal evolutions of neutron stars.

    ↳ astro-ph.HEnucl-thPRC(2025)·4 citations
  4. 07

    Causal UV completions of relativistic hydrodynamics

    Robbe Brants🇧🇪

    Relativistic hydrodynamics successfully provides an effective field theory description for the low energy regime of many out-of-equilibrium systems. On the other hand, in this paper we prove that any stand-alone hydrodynamic EFT is inherently acausal and therefore requires the addition of transient UV modes in order to restore causality. This is made possible by the exponential decay of dissipative hydrodynamics in a majority of the lightcone, allowing the possibility of a causal description that still reduces to the hydrodynamic one at late timescales. We then investigate the emergence and possible restrictions of the non-hydrodynamic modes in these causal UV completions.

    ↳ hep-thhep-phmath-phmath.MP+12 citations

Affiliations

first authorsco-authorsvia INSPIRE