Kaluza-Klein gravitons are negative energy dust in brane cosmology

Journal Article · Fri Apr 15 04:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.084019· OSTI ID:20709090

Minamitsuji, Masato ^[1]; Sasaki, Misao ^[2]; Langlois, David ^[3]

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1. Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka 560-0043 (Japan)
2. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
3. APC, Astroparticules et Cosmologie, 11 Place Marcelin Berthelot, F-75005 Paris (France)

We discuss the effect of Kaluza-Klein (KK) modes of bulk metric perturbations on the second Randall-Sundrum (RS II) type brane cosmology, taking the possible backreaction in the bulk and on the brane into account. KK gravitons may be produced via quantum fluctuations during a de Sitter (dS) inflating phase of our brane universe. In an effective 4-dimensional theory in which one integrates out the extra-dimensional dependence in the action, KK gravitons are equivalent to massive gravitons on the brane with masses m>3H/2, where H represents the expansion rate of a dS brane. Thus production of even a tiny amount of KK gravitons may eventually have a significant impact on the late-time brane cosmology. As a first step to quantify the effect of KK gravitons on the brane, we calculate the effective energy density and pressure for a single KK mode. Surprisingly, we find that a KK mode behaves as cosmic dust with a negative energy density on the brane. We note that the bulk energy density of a KK mode is positive definite and there occurs no singular phenomenon in the bulk.

• OSTI ID: 20709090
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 8 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMIC DUST
COSMOLOGY
DE SITTER GROUP
DISTURBANCES
ENERGY DENSITY
FLUCTUATIONS
GRAVITONS
KALUZA-KLEIN THEORY
MEMBRANES
QUANTUM FIELD THEORY
SPACE-TIME
UNIVERSE