Problems with Time-Varying Extra Dimensions or "Cardassian Expansion" as Alternatives to Dark Energy

Details Problems with Time-Varying Extra Dimensions or "Cardassian Expansion" as Alternatives to Dark Energy Problems with Time-Varying Extra Dimensions or "Cardassian Expansion" as Alternatives to Dark Energy

2002-11-18

arxiv.org/abs/hep-ph/0211284v3

Phys.Rev. D68 (2003) 025015

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, minor changes. To appear in Physical Review D

Scientific paper

10.1103/PhysRevD.68.025015

It has recently been proposed that the Universe might be accelerating as a consequence of extra dimensions with time varying size. We show that although these scenarios can lead to acceleration, they run into serious difficulty when taking into account limits on the time variation of the four dimensional Newton's constant. On the other hand, models of ``Cardassian'' expansion based on extra dimensions which have been constructed so far violate the weak energy condition for the bulk stress energy, for parameters that give an accelerating universe.

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