Massless and massive graviton spectra in anisotropic dilatonic braneworld cosmologies

Journal Article · Thu Jun 15 04:00:00 EDT 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.73.124015· OSTI ID:20774898

De Risi, G ^[1]

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1. Dipartimento di Fisica, Universita di Bari, and Istituto Nazionale di Fisica Nucleare, Sezione di Bari Via G. Amendola 173, 70126 Bari (Italy)

We consider a braneworld model in which an anisotropic brane is embedded in a dilatonic background. We find the background solutions and study the behavior of the perturbations when the universe evolves from an inflationary Kasner phase to a Minkowski phase. We calculate the massless mode spectrum, and find that it does not differ from what expected in standard four-dimensional cosmological models. We then evaluate the spectrum of both light (ultrarelativistic) and heavy (nonrelativistic) massive modes, and find that, at high energies, there can be a strong enhancement of the Kaluza-Klein spectral amplitude, which can become dominant in the total spectrum. The presence of the dilaton, on the contrary, decrease the relative importance of the massive modes.

• OSTI ID: 20774898
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 12 Vol. 73; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANISOTROPY
COSMOLOGICAL MODELS
COSMOLOGY
DISTURBANCES
ENERGY SPECTRA
GRAVITONS
KALUZA-KLEIN THEORY
MATHEMATICAL SOLUTIONS
MEMBRANES
QUANTUM GRAVITY
RELATIVISTIC RANGE
UNIVERSE