Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-08-07
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
28 pages, 4 figs, to appear in NPB; This is a joint paper of hep-th/0607166 and astro-ph/0607531, which will be withdrawn
Scientific paper
10.1016/j.nuclphysb.2009.08.013
We present a novel mechanism for the present acceleration of the universe. We find that the temperature of the Unruh radiation perceived by the brane is not equal to the inherent temperature (Hawking temperature at the apparent horizon) of the brane universe in the frame of Dvali-Gabadadze-Porrati (DGP) braneworld model. The Unruh radiation perceived by a dust dominated brane is always warmer than the brane measured by the geometric temperature, which naturally induces an energy flow between bulk and brane based on the most sound thermodynamics principles. Through a thorough investigation to the microscopic mechanism of interaction between bulk Unruh radiation and brane matter, we put forward that an energy influx from bulk Unruh radiation to the dust matter on the brane accelerates the universe.
Noh Hyerim
Yu Hongwei
Zhang Hongsheng
Zhu Zong-Hong
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