[SEMINARI] [SEMINAR] Accretion in spacetimes with the cosmological constant, Patryk Mach

[Enric Marco]

Title: Accretion in spacetimes with the cosmological constant

by: Patryk Mach

from: Jagiellonian University, Institute of Physics, Cracòvia, Polònia

where: Seminari del departament d'Astronomia i Astrofísica

date: Dijous 21 novembre 2013, 12:00 h.

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.

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Dr. Enric Marco
Departament d'Astronomia i Astrofísica
Facultat de Física
Universitat de València
C/  Dr. Moliner, 50
46100 Burjassot, Spain
Phone: (34)-96-354-3069
Fax:(34)-96-354-3084
enric.marco en uv.es
www.uv.es/marco
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