Kenta Yoshimura

Neural-Network-Based Variational Method in Nuclear Density Functional Theory: Application to the Kohn--Sham method

Kenta Yoshimura, Kazuyuki Sekizawa

We extend the neural-network-based variational method for nuclear density functional theory to the Kohn--Sham scheme, representing the complex spinor components of the single-particle orbitals by multi-layer perceptrons. We show that neural-network optimization of a given energy density functional, combined with an orthonormalization …

Isotone Chain Study of p –Atom Spectroscopy and Strong Spin–Orbit Splittings

Kenta Yoshimura, Shunsuke Yasunaga, Daisuke Jido, Hiroyuki Fujioka

Abstract Antiprotonic atoms have served as a pivotal tool for investigating the properties of baryon–baryon interactions, including their spin dependence. Examining the spin–orbit splittings induced by their strong interactions also could help clarify the nature of the $\bar{p}$–nucleus interactions and their fraction …

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Neural-Network-Based Variational Method in Nuclear Density Functional Theory: Application to the Extended Thomas-Fermi Model

Kenta Yoshimura

We propose a neural-network-based variational framework for nuclear Density Functional Theory based on the extended Thomas--Fermi (ETF) model, in which proton and neutron number densities are represented by multilayer perceptrons and determined by direct minimization of a Skyrme-type energy density functional. We …

Accuracy and Applicability of the Hartle–Thorne and Komatsu–Eriguchi–Hachisu Methods for Modeling Rotating Neutron Stars

Hyuk Jin Kwon, Kenta Yoshimura, Tsuyoshi Miyatsu, Kazuyuki Sekizawa et autres

Abstract Neutron stars, which are composed of extremely dense nuclear matter, serve as natural laboratories to study nuclear interactions beyond the terrestrial experiments. Recent studies have actively explored how the equation of state (EoS) can be constrained by observed neutron star masses …

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Interrelation between p -Ca Atom Spectra and Nuclear Density Profiles

Kenta Yoshimura, Shunsuke Yasunaga, Daisuke Jido, S. Hirenzaki

Abstract This work studies $\bar{p}$-Ca atom spectra in light of the strong shifts and level widths, using the optical model with several types of parametric coefficients. The spectroscopic quantities are obtained as the eigenvalues of the Dirac equation, where the nuclear densities …

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Interrelation between $\bar{p}$-Ca Atom Spectra and Nuclear Density Profiles

Kenta Yoshimura, Shunsuke Yasunaga, Daisuke Jido, J. Yamagata-Sekihara et autres

This work studies $\bar{p}$-Ca atom spectra in light of the strong shifts and level widths, using the optical model with several types of parametric coefficients. The spectroscopic quantities are obtained as the eigenvalues of the Dirac equation, where the nuclear densities computed …

Time-Dependent Superfluid Band Theory for the Inner Crust of Neutron Stars: Current Status and Future Challenges

Kazuyuki Sekizawa, Kenta Yoshimura

In this contribution, current status and future prospects of our ongoing project is summarized. In the inner crust of neutron stars, a variety of crystalline structures may emerge, as a result of competition of Coulomb and nuclear interactions, which are immersed in …