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Disformal Theories of Gravity: From the Solar System to Cosmology
Jeremy Sakstein
This paper is concerned with theories of gravity that contain a scalar coupled both conformally and disformally to matter through the metric. By systematically deriving the non-rel…
Testing Gravity Theories Using Stars
Jeremy Sakstein, Bhuvnesh Jain, Vinu Vikram
Modified theories of gravity have received a renewed interest due to their ability to account for the cosmic acceleration. In order to satisfy the solar system tests of gravity, th…
Towards Viable Cosmological Models of Disformal Theories of Gravity
Jeremy Sakstein
The late-time cosmological dynamics of disformal gravity are investigated using dynamical systems methods. It is shown that in the general case there are no stable attractors that…
Astrophysical Tests of Modified Gravity: Stellar and Gaseous Rotation Curves in Dwarf Galaxies
Vinu Vikram, Jeremy Sakstein, Charles Davis +1
Chameleon theories of gravity predict that the gaseous component of isolated dwarf galaxies rotates with a faster velocity than the stellar component. In this paper, we exploit thi…