Infrared modifications of gravity

Details Infrared modifications of gravity Infrared modifications of gravity

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phdt.........8r&link_type=abstract

Ph.D dissertation, 2005. 209 pages; United States -- New York: New York University; 2005. Publication Number: AAT 3170872. DAI-

Physics

Infrared, Gravity, Brane Worlds, Quantum Gravity

Scientific paper

In this thesis, we study theories that modify gravity at very large distances. Motivated by recent observations in cosmology, such as the dimming of type Ia supernovae and flattening of rotation curves of galaxies, we study two classes of theories that attempt to explain these observations as due to a change in the laws of gravity at large distances rather than due to the presence of new forms of exotic energy and matter. The first class of theories is massive gravity, obtained by adding a mass term to the action for the gravitational fluctuation in Einstein's general relativity. The second class of models we study are braneworlds that provide infrared modified gravity, in specific the Dvali-Gabadadze-Porrati model and its extension to higher codimensional branes. We stress in our discussion the field theoretical consistency, both classically and quantum-mechanically, of these models.

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