Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
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Volume 78, Issue 4
Displaying 1-22 of 22 articles from this issue
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Preface
Contents
Overview Articles
  • ODE/IM Correspondence―A Mysterious Relation between Ordinary Differential Equations and Quantum Integrable Models
    Katsushi Ito
    Article type: Overview Articles
    2023 Volume 78 Issue 4 Pages 180-189
    Published: April 05, 2023
    Released on J-STAGE: April 05, 2023
    DOIhttps://doi.org/10.11316/butsuri.78.4_180
    JOURNAL FREE ACCESS
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    The ODE/IM correspondence is a relation between the spectral analysis of ordinary differential equations (ODE) and quantum integrable models (IM). We briefly review some essential ideas of the correspondence and its application to the exact WKB analysis. In particular, we discuss the relation between the exact WKB periods and the Y-functions in two-dimensional integrable field theories, where the thermodynamic Bethe ansatz equations and their wall-crossing phenomena play an important role.

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  • Cosmic Dark Ages with Neutral Hydrogen 21 cm Line
    Daisuke Yamauchi
    Article type: Overview Articles
    2023 Volume 78 Issue 4 Pages 190-197
    Published: April 05, 2023
    Released on J-STAGE: April 05, 2023
    DOIhttps://doi.org/10.11316/butsuri.78.4_190
    JOURNAL FREE ACCESS
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    Low-frequency radio observations of the redshifted 21 cm line of neutral hydrogen have the potential to open up a new window on the high-redshift Universe, in particular the cosmic dark ages. In this article, we review the properties of the 21 cm line as the only known way to probe the cosmic dark ages. The 21 cm line is the spectral line that is created by a change in the energy state of neutral hydrogen atoms. By mapping the intensity of redshifted 21 cm line, the low-frequency radio observations can provide a very precise picture of the underlying matter distributions in the period after recombination. The projects to measure the 21 cm line during the dark ages from the far side of the Moon are also introduced.

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