Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2004-02-05
Grav.Cosmol. 9 (2003) 313-318
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
6 pages, gc style
Scientific paper
A thick Z_2-symmetric domain wall supported by a scalar field with an arbitrary potential V(\phi) in 5D general relativity is considered as a candidate brane world. We show that, under the global regularity requirement, such a configuration (i) has always an AdS asymptotic far from the brane, (ii) is only possible if V(\phi) has an alternating sign and (iii) V(\phi) satisfies a certain fine-tuning type equality. The thin brane limit is well defined and conforms to the Randall-Sundrum (RS2) brane world model if the asymptotic value of V(\phi) (related to \Lambda, the effective cosmological constant) is kept thickness-independent. Universality of such a transition is demonstrated using as an example exact solutions for stepwise potentials of different shapes. Also, due to scale invariance of the Einstein-scalar equations, any given regular solution creates a one-parameter family of solutions with different potentials. In such families, a thin brane limit does not exist while the ratio \Lambda/(brane tension)^2 is thickness-independent and is in general different from its value in the RS2 model.
Bronnikov Kirill A.
Meierovich Boris E.
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