Does Unruh radiation accelerate the universe? A novel approach to the
  cosmic acceleration
  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.
