Ed Bertschinger
Massachusett Inst. Technology (MIT) (Cambridge, Massachusetts, Etats-Unis d'Amérique)
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
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| « Testing Gravity on Cosmological Scales » |
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Ed Bertschinger |
| For a given expansion history, models of modified gravity generically differ from general relativity in two ways: the growth of structure and the propagation of light (affecting both gravitational lensing and the integrated Sachs-Wolfe effect). In addition it is possible that non-minimal couplings to matter might cause departures from geodesic motion for cold dark matter. Given our lack of understanding of cosmic acceleration, all of these possibilities should be explored using galaxy clustering, peculiar velocities, weak gravitational lensing and the ISW effect. Cosmological tests based solely on the expansion history and growth of structure are inadequate to test modified gravity as an alternative to dark energy. |
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vendredi 30 octobre 2009 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |