FINE TUNING PROBLEM IN FIVE-DIMENSIONAL BRANE WORLD MODELS

Автор(и)

  • S. H. Fakhr Astronomical Observatory, Odessa National University, Odessa, Ukraine;, Україна
  • M. Eingorn Astronomical Observatory, Odessa National University, Odessa, Ukraine; Department of Theoretical and Experimental Nuclear Physics, Odessa National Polytechnic University, Odessa, Ukraine;, Україна
  • A. Zhuk Astronomical Observatory, Odessa National University, Odessa, Ukraine;, Україна

DOI:

https://doi.org/10.18524/1810-4215.2012.25.83332

Ключові слова:

brane world models, extra dimensions.

Анотація

Fine tuning can be called a main disadvantage of the Randall-Sundrum model, representing the most popular brane world model, constructed quite artificially in the five-dimensional space-time. It needs a bare multidimensional cosmological constant, which is related strictly to four-dimensional tension (the brane physical property). Here we try to avoid this problem of naturalness, introducing a perfect fluid with arbitrary equations of state in both three-dimensional external and onedimensional internal spaces parallel with the cosmological constant. It enables to preserve randomness of parameters of the considered model, which represents the direct generalization of the Randall-Sundrum one. We derive equations for background metric coefficients, determining a wide class of new exact solutions, and discuss uselessness of subsequent development of brane world models in view of their unjustified plurality.

Посилання

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Опубліковано

2012-11-15

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