Generation of dark radiation in the bulk inflaton model

• Main Authors: Tanaka, Takahiro, Himemoto, Yoshiaki
• Format: Journal Article
• Language: English
• Published: 05-01-2003
• Subjects: Physics - Astrophysics of Galaxies; Physics - Cosmology and Nongalactic Astrophysics; Physics - Earth and Planetary Astrophysics; Physics - General Relativity and Quantum Cosmology; Physics - High Energy Astrophysical Phenomena; Physics - High Energy Physics - Phenomenology; Physics - High Energy Physics - Theory; Physics - Instrumentation and Methods for Astrophysics; Physics - Solar and Stellar Astrophysics
• DOI: 10.48550/arxiv.gr-qc/0301010

Phys.Rev.D67:104007,2003 We investigate the dynamics of a bulk scalar field with various decay
channels in the Randall-Sundrum infinite braneworld scenario. A bulk scalar
field in this scenario has a quasi-localized mode which dominates the late-time
behavior near the brane. As for this mode, an interesting point is the presence
of dissipation caused by the escape of the energy in the direction away from
the brane, even if the bulk scalar field does not have the interaction with the
other bulk fields in the bulk and fields on the brane. We can interpret that
this lost energy is transfered to the dark radiation. We show that such an
effective 4-dimensional description for a bulk scalar field is valid including
the various processes of energy dissipation.