Dark Energy from Brane-world Gravity

Details Dark Energy from Brane-world Gravity Dark Energy from Brane-world Gravity

2006-02-18

arxiv.org/abs/astro-ph/0602415v1

J.Phys.Conf.Ser.68:012046,2007; Lect.NotesPhys.720:323-332,2007

Astronomy and Astrophysics

Astrophysics

Based on a talk at the 3rd Aegean Summer School, Chios, September 2005

Scientific paper

10.1088/1742-6596/68/1/012046 10

Recent observations provide strong evidence that the universe is accelerating. This confronts theory with a severe challenge. Explanations of the acceleration within the framework of general relativity are plagued by difficulties. General relativistic models require a "dark energy" field with effectively negative pressure. An alternative to dark energy is that gravity itself may behave differently from general relativity on the largest scales, in such a way as to produce acceleration. The alternative approach of modified gravity also faces severe difficulties, but does provide a new angle on the problem. This review considers an example of modified gravity, provided by brane-world models that self-accelerate at late times.

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