D H Coule 2001 Class. Quantum Grav. 18 4265 doi:10.1088/0264-9381/18/20/306
Does brane cosmology have realistic principles?
D H Coule
Show affiliationsThe maximal symmetry, or perfect cosmological principle (PCP), that prevents AdS-type spaces from degenerating into anti-inflationary collapse is argued to be unphysical. For example, the simple requirement that brane-bulk models should be the result of having evolved from even more energetic string phenomena picks out a preferred time direction. We question whether quantum cosmological reasoning can be applied in any meaningful way to obtain, what are essentially, classical constructs. An alternative scheme is to more readily accept the PCP and allow the branes to also become eternal. A perpetually expanding and contracting brane model could be driven by the presence of charged black holes in the AdS bulk, that effectively violates the weak-energy condition as singularities are approached. This can be contrasted with the so-called ekpyrotic universe which also closely accepts the PCP. This being broken only by occasional collisions between branes, that can then simulate a big-bang cosmology.
- PACS
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04.70.-s Physics of black holes
- MSC
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85A40 Cosmology (For relativistic cosmology, see 83F05)
81T30 String and superstring theories; other extended objects (e.g., branes) (See also 83E30)
- Subjects
- Dates
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Issue 20 (21 October 2001)
Received 23 May 2001
Published 1 October 2001
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Does brane cosmology have realistic principles?
D H Coule 2001 Class. Quantum Grav. 18 4265
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