A multidimensional global monopole and nonsingular cosmology

We consider a spherically symmetric global monopole in general relativity in (D = d + 2)-dimensional space-time. For γ < d -1, where γ is a parameter characterizing the gravitational field strength, the monopole is shown to be asymptotically flat up to a solid angle defect. In the range d - 1 < γ < 2d(d + 1 )/(d + 2), the monopole space-time contains a cosmological horizon. Outside the horizon, the metric corresponds to a cosmological model of the Kantowski-Sachs type, where spatial sections have the topology ℝ double-struck S signd. In the important case where the horizon is far from the monopole core, the temporal evolution of the Kantowski-Sachs metric is described analytically. The Kantowski-Sachs space-time contains a subspace with a(d + 1)-dimensional Friedmann-Robertson-Walker metric, whose possible cosmological application is discussed. Some estimates in the d = 3 case show that this class of nonsingular cosmologies can be viable. In particular, the symmetry-breaking potential at late times can give rise to both dark matter and dark energy. Other results, generalizing those known in 4-dimensional space-time, are derived, in particular, the existence of a large class of singular solutions with multiple zeros of the Higgs field magnitude. © 2003 MAIK "Nauka/Interperiodica".

Авторы
Bronnikov K.A. 1, 2 , Meierovich B.E.3
Редакторы
-
Издательство
-
Номер выпуска
1
Язык
Английский
Страницы
1-9
Статус
Опубликовано
Подразделение
-
Номер
-
Том
97
Год
2003
Организации
  • 1 Center for Gravitation and Fundamental Metrology, Russian Research Institute for Metrological Service, Moscow, 117313, Russian Federation
  • 2 Institute of Gravitation and Cosmology, Peoples Friendship University of Russia, Moscow, 117198, Russian Federation
  • 3 Kapitza Institute for Physical Problems, Russian Academy of Sciences, Moscow, 117334, Russian Federation
Ключевые слова
Density (specific gravity); Gravitation; Optimization; Parameter estimation; Space research; Topology; Cosmology; Friedmann-Robertson-Walker metric; Gravitational field strength; Higgs field magnitude; Cosmic rays
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/56/