Is cosmic speedup due to new gravitational physics?
Abstract
We show that cosmic acceleration can arise due to very tiny corrections to the usual gravitational action of general relativity, of the form R^{n} with n>0. This model eliminates the need for a nonzero cosmological constant or any other form of dark energy, attributing a purely gravitational origin to the acceleration of the universe.
 Publication:

Physical Review D
 Pub Date:
 August 2004
 DOI:
 10.1103/PhysRevD.70.043528
 arXiv:
 arXiv:astroph/0306438
 Bibcode:
 2004PhRvD..70d3528C
 Keywords:

 98.80.k;
 04.50.+h;
 Cosmology;
 Gravity in more than four dimensions KaluzaKlein theory unified field theories;
 alternative theories of gravity;
 Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 4 pages, 1 figure, RevTeX. Typos corrected, references updated