Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
Volume 73 , Issue 6
Showing 1-22 articles out of 22 articles from the selected issue
Preface
Contents
Reviews
Researches
  • Kent Yagi
    Type: Researches
    2018 Volume 73 Issue 6 Pages 370-375
    Published: June 05, 2018
    Released: February 05, 2019
    JOURNALS FREE ACCESS

    One of the biggest uncertainties in nuclear physics lies on the equation of state for supranuclear matter, and neutron stars offer excellent testbeds to probe dense matter physics. In this article, I explain rather unexpected universal relations among neutron star observables that do not depend strongly on the underlying equation of state. In particular, I explain the relations among the stellar moment of inertial (I), tidal deformability (or Love number) and quadrupole moment (Q), hence the I-Love-Q relations. Such relations are extremely useful for probing fundamental physics. For example, one can use such relations to probe strong-field gravity without being affected by uncertainties in nuclear physics. Similar universal relations also hold among stellar multipole moments that resemble the well-known no-hair properties for black holes. I end this article by explaining the possible origin of such universality and speculating its relation to the universality that appears in second-order phase transitions in condensed matter physics.

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  • Yoshiaki Koma, Miho Koma
    Type: Researches
    2018 Volume 73 Issue 6 Pages 376-381
    Published: June 05, 2018
    Released: February 05, 2019
    JOURNALS FREE ACCESS

    We present results of the static three-quark potential obtained by using lattice QCD Monte-Carlo simulations with the Polyakov loop correlation function. We investigate the potential of O(200) sets of the three-quark geometries including not only the cases that three quarks are put at the vertices of acute, right, and obtuse triangles, but also the extreme cases such that three quarks are put in line. We find several new interesting features of the three-quark potential, and discuss its possible functional form.

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  • Nodoka Yamanaka, Naotaka Yoshinaga, Koichiro Asahi
    Type: Researches
    2018 Volume 73 Issue 6 Pages 382-387
    Published: June 05, 2018
    Released: February 05, 2019
    JOURNALS FREE ACCESS

    The electric dipole moment (EDM) is a low-energy observable that only gets finite when the CP symmetry is violated, and serves as an exclusively sensitive probe in detecting new physics. EDMs, being mostly searched for in composite systems, are generated at the elementary level and come up through several nontrivial processes which lie in wide hierarchies of energy scale. In the present article, we review the current status of EDM study and discuss problems still to be solved, mainly focusing on those of diamagnetic atoms which contain the elementary, hadronic, nuclear and atomic physics and relate the CP violation of candidates of physics beyond the standard model to the final observables.

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