Astrophysical extension of gravity (Sergio Mendoza; Instituto de Astronomia, Universidad Nacional Autonoma de Mexico)

From July 27, 2016 13:15 until July 27, 2016 13:45

At Instituto de Astrofísica, Pontificia Universidad Católica, Vicuña Mackenna 4860, Santiago, Chile

Categories: Seminarios

Newtonian gravity and its relativistic extension, the general theory of relativity, are extremely well tested in our solar system. Both proposals were built with solar system dynamics provided in Kepler's laws for the motion of planets. When the scales of mass and length associated to a particular astrophysical system greatly exceed the solar system values in such a way that the gravitational acceleration on a given test particle is less or about 10-10 m/s2, either non-baryonic dark matter is required or Kepler's third law of motion requires a modification (the Tully-Fisher law). In this talk I will discuss non-relativistic and relativistic developments for extending gravity based on the Tully-Fisher law, which in its simplest form yields the basic MOdified Newtonian Dynamics (MOND) formula. I explain dynamics of systems from scales to solar system up to galaxy clusters and the accelerated expansion of the universe. Also, I will explain how these ideas are in very good agreement with the deflection of light and gravitational lensing in individual, groups and clusters of galaxies.