Effective Friedmann model from multidimensional cosmologies
Дата
2007
Автори
Науковий керівник
Укладач
Редактор
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Назва тому
Видавець
Анотація
We investigate the possibility of the construction of the conventional Friedmann cosmology for our
observable Universe if the underlying theory is the multidimensional Kaluza–Klein model.We show
that the effective Friedmann model obtained by dynamic compactification of the multidimensional
model is faced with too strong variations in the fundamental constants. On the other hand, models with
stable compactification of the internal space are free from this problem and also result in conventional
four-dimensonal cosmological behaviour for our Universe. We prove a no-go theorem, which shows
that stable compactification of the internal spaces is possible only if the equations of state in the
external and internal spaces are properly adjusted to each other. With a proper choice of parameters
(fine tuning), the effective cosmological constant in this model provides the late-time acceleration of
the Universe.
Опис
Ключові слова
Multidimensional cosmological models, Dynamic compactification, Stable compactification, Fundamental constant variation
Бібліографічний опис
Astronomical & Astrophysical Transactions. The Journal of the Eurasian Astronomical Society