عنوان مجله
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INTERNATIONAL JOURNAL OF MODERN PHYSICS D
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چکیده
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The energy density of the holographic dark energy is based on the area law of entropy, and thus any
modification of the area law leads to a modified holographic energy density. Inspired by the entropy
expression associated with the apparent horizon of a Friedmann-Robertson-Walker (FRW) Universe
in DGP braneworld, we propose a new model for the holographic dark energy in the framework
of DGP brane cosmology. We investigate the cosmological consequences of this new model and
calculate the equation of state parameter by choosing the Hubble radius, L = H−1, as the system’s
IR cutoff. Our study show that, due to the effects of the extra dimension (bulk), the identification
of IR-cutoff with Hubble radius, can reproduce the present acceleration of the Universe expansion.
This is in contrast to the ordinary holographic dark energy in standard cosmology which leads to
the zero equation of state parameter in the case of choosing the Hubble radius as system’s IR cutoff
in the absence of interaction between dark matter and dark energy.
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