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Planck-Scale Corrections to Friedmann Equation

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arxiv 1403.5319 v1 pith:L7LB2X62 submitted 2014-03-20 gr-qc hep-th

Planck-Scale Corrections to Friedmann Equation

classification gr-qc hep-th
keywords equationfriedmannobtainverlindegravityplanck-scaleproposalaccommodate
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Recently, Verlinde proposed that gravity is an emergent phenomenon which originates from an entropic force. In this work, we extend Verlinde's proposal to accommodate generalized uncertainty principles (GUP), which are suggested by some approaches to \emph{quantum gravity} such as string theory, black hole physics and doubly special relativity (DSR). Using Verlinde's proposal and two known models of GUPs, we obtain modifications to Newton's law of gravitation as well as the Friedmann equation. Our modification to the Friedmann equation includes higher powers of the Hubble parameter which is used to obtain a corresponding Raychaudhuri equation. Solving this equation, we obtain a leading Planck-scale correction to Friedmann-Robertson-Walker (FRW) solutions for the $p=\omega \rho$ equation of state.

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