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Speaker |
Saridakis, Emmanuel |
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| Talk Title |
f(R) nonlinear massive gravity and cosmology |
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Abstract |
Massive gravity is the most reasonable (although not the simplest) extension of General Relativity that one can think of. Apart from theoretical interest, one has a strong cosmological motivation too: massive gravity implies that gravity becomes weaker and weaker at large distances and thus one could hope to explain the universe acceleration. Simple models suffer from the problems of van Dam-Veltman-Zakharov discontinuity and Boulware-Deser ghosts. Although these can be cured through the recently constructed de Rham-Gabadadze-Tolley nonlinear massive gravity, unfortunately this new theory does not exhibit cosmological behaviour in agreement with observations. Thus, suitably extensions are necessary, such as f(R) nonlinear massive gravity. We construct it and we investigate the cosmological and phenomenological implications of such a theory, obtaining an effective dark energy sector that drives late time acceleration. |
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