論文

査読有り
1998年

Neutron stars in scalar-tensor theories of gravity and catastrophe theory

Physical Review D - Particles, Fields, Gravitation and Cosmology
  • Tomohiro Harada

57
8
開始ページ
4802
終了ページ
4811
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevD.57.4802

We investigate neutron stars in scalar-tensor theories. We examine their secular stability against spherically symmetric perturbations by use of a turning point method. For some choices of the coupling function contained in the theories, the number of the stable equilibrium solutions changes and the realized equilibrium solution may change discontinuously as the asymptotic value of the scalar field or total baryon number is changed continuously. The behavior of the stable equilibrium solutions is explained by fold and cusp catastrophes. Whether or not the cusp catastrophe appears depends on the choice of the coupling function. These types of catastrophes are structurally stable. Recently discovered spontaneous scalarization, which is a nonperturbative strong-field phenomenon due to the presence of the gravitational scalar field, is well described in terms of the cusp catastrophe. © 1998 The American Physical Society.

リンク情報
DOI
https://doi.org/10.1103/PhysRevD.57.4802
ID情報
  • DOI : 10.1103/PhysRevD.57.4802
  • ISSN : 1550-2368
  • ISSN : 1550-7998
  • SCOPUS ID : 0037554717

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