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Title: Extra dimensions, dilaton and dark energy
Authors: Rador, Tonguç
Keywords: Extra dimensions
Dark energy
String/brane gas cosmology
Dynamical stabilization
Issue Date: 1-Sep-2011
Publisher: Elsevier Ltd.
Source: Rador, T. (2011). Extra dimensions, dilaton and dark energy. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 703(1) , 20-24. doi:10.1016/j.physletb.2011.07.056
Abstract: In view of the recent observations showing that the universe is accelerating we discuss dilaton and radion stabilization from a phenomenological perspective using perfect fluid sources. One general conclusion we present is that the pressure coefficient along extra dimensions should be -2 if that of the observed dimensions is -1, the latter mimicking a cosmological constant compatible with experimental data. The conditions on the dilaton coupling are similarly strong: we find that if the coupling of the dilaton Φ to fields other than gravity is of the form -ge(a-2)ΦL where L representing all other fields yielding the mentioned fluid, a must be -2 if space-time dimensionality is 10. Within our approach these conditions result taking constant radion and dilaton at the level of the equations of motion. To ameliorate this we also discuss how dynamical stabilization may be achieved with a simple variant in which a dilaton potential is added in the picture where the mentioned constraints are shown to remain.
ISSN: 0370-2693
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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