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Nuclear Theory·nucl-th

Thursday·June 6, 2024

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 05

    Strange Dwarfs: a review on the (in)stability

    Francesco Di Clemente🇮🇹 · Alessandro Drago🇮🇹 · Giuseppe Pagliara🇮🇹

    White dwarfs are the remnants of stars not massive enough to become supernovae. This review explores the concept of strange dwarfs, a unique class of white dwarfs which contain cores of strange quark matter. Strange dwarfs have different sizes, masses, and evolutionary paths with respect to white dwarfs. They might form through the accumulation of normal matter on strange quark stars or by capture of strangelets. The stability of strange dwarfs has been debated, with initial studies suggesting stability, while later analyses indicated potential instability. This review revisits these discussions, focusing on the critical role of boundary conditions between nuclear and quark matter in determining stability. It also offers insights into their formation, structure, and possible detection in the universe.

    ↳ astro-ph.SRastro-ph.HEhep-phnucl-thUniverse(2024)·5 citations
  2. 06

    A dynamical implementation of canonical second quantization on a quantum computer

    Juan José Gálvez-Viruet🇪🇸 · Felipe J. Llanes-Estrada🇪🇸

    We develop theoretical methods for the implementation of creation and destruction operators in separate registers of a quantum computer, allowing for a transparent and dynamical creation and destruction of particle modes in second quantization in problems with variable particle number. We establish theorems for the commutation (anticommutation) relations on a finite memory bank and provide the needed symmetrizing and antisymmetrizing operators. Finally, we provide formulae in terms of these operators for unitary evolution under conventional two- and four-body Hamiltonian terms, as well as terms varying the particle number. In this formalism, the number of qubits needed to codify particles with modes each is of order . Such scaling is more efficient than the Jordan-Wigner transformation which requires qubits, whenever there are a modest number of particles with a large number of states available to each (and less advantageous for a large number of particles with few states available to each). And although less efficient, it is also less cumbersome than compact encoding.

    ↳ hep-thnucl-thquant-phPRD(2024)·6 citations
  3. 07

    Nonlocal chiral contributions to generalized parton distributions of the proton at nonzero skewness

    Zhengyang Gao🇨🇳 · Fangcheng He🇺🇸 · Chueng-Ryong Ji🇺🇸 · W. Melnitchouk🇺🇸 · Y. Salamu🇨🇳 · P. Wang🇨🇳

    We compute the one-loop contributions to spin-averaged generalized parton distributions (GPDs) in the proton from pseudoscalar mesons with intermediate octet and decuplet baryon states at nonzero skewness. Our framework is based on nonlocal covariant chiral effective theory, with ultraviolet divergences regularized by introducing a relativistic regulator derived consistently from the nonlocal Lagrangian. Using the splitting functions calculated from the nonlocal Lagrangian, we find the nonzero skewness GPDs from meson loops by convoluting with the phenomenological pion GPD and the generalized distribution amplitude, and verify that these satisfy the correct polynomiality properties. We also compute the lowest two moments of GPDs to quantify the meson loop effects on the Dirac, Pauli and gravitational form factors of the proton.

    ↳ hep-phnucl-thPRD(2024)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE