AT1 - Alternative Theories (A) |
Speaker_ |
De Araujo, Jose Carlos |
Co-autors |
Oswaldo Miranda |
Talk _ |
Galactic disks in theories with Yukawian gravitational potential |
Abstract _ |
We present a new solution for the rotation curves of galactic disks in theories with gravitational potential of the Yukawa type. We follow the technique employed by Toomre in the study of galactic disks in the Newtonian theory. We then apply our formulation to the study of rotation curves for a zero-thickness exponential disk and compare with the Newtonian case studied by Freeman. As an additional result of the mathematical tool developed here, we show that in any theory of gravity with a massive graviton (this means a gravitational potential of the Yukawa type), a strong limit can be imposed on the mass (m_{g}) of this particle. For example, in order to obtain a galactic disk with a scale length of b=10 kpc, we should have a massive graviton of m_{g}<< 10^{-59} g. This result is much more restrictive than those inferred from solar system observations. |