S E M I N A R I

Departament d'Astronomia i Astrofísica
Universitat de València

    Accretion in spacetimes with the cosmological constant

Patryk Mach

Jagiellonian University, Institute of Physics, Cracòvia, Polònia


Seminari del departament d'Astronomia i Astrofísica

Dijous 21 novembre 2013

12:00


Resum

I will discuss spherical, isothermal and polytropic steady accretion models in the presence of the cosmological constant. Exact solutions are found for a class of isothermal fluids, assuming the test gas approximation. These results can have cosmological connotation, through the Einstein–Straus vacuole model of embedding local structures into FLRW spacetimes. In particular, one infers that steady accretion would not exist in the late phases of the Penrose’s scenario of the evolution of the Universe. If time permits, stability of the obtained solutions will be also discussed.