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Dark stars in a Starobinsky's cosmology

May. 15, 2018

In the most modern version of the Big Bang, the universe begins with a burst of exponential expansion in which an infinitesimal fleck of space-time expands into the flat and smooth universe that we live-in today. This episode of very rapid growth of the universe is known as "cosmic inflation". The idea was pioneered by Alan Guth, Andrei Linde and Aleksei Starobinsky in the early's 80's. All these theories by postulating the existence of a single "inflaton field" are able to qualitatively reproduce many features of our present universe, but not the existence of dark matter. In recent years, the Starobinsky inflation has become quite popular in the context of modified theories of gravity, since such cosmological model does not explain the origin of dark matter for which it is necessary to postulate the existence of a particle. Grigoris Panotopoulos and Ilídio Lopes have recently studied the properties of dark stars (i.e. stars made exclusively of bosonic dark matter particles) in a Starobinsky's Universe. In particular, they computed the mass-radius relations for these exotic stars in such an Universe (https://doi.org/10.1103/PhysRevD.97.024030).