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Dynamics of Robertson-Walker spacetimes with diffusion

Artur Alho ; Simone Calogero (Institutionen för matematiska vetenskaper, matematik) ; Maria Piedade Machado Ramos ; Ana Jacinta Soares
Annals of Physics (0003-4916). Vol. 354 (2015), p. 475-488.
[Artikel, refereegranskad vetenskaplig]

We study the dynamics of spatially homogeneous and isotropic spacetimes containing a fluid undergoing microscopic velocity diffusion in a cosmological scalar field. After deriving a few exact solutions of the equations, we continue by analyzing the qualitative behavior of general solutions. To this purpose we recast the equations in the form of a two dimensional dynamical system and perform a global analysis of the flow. Among the admissible behaviors, we find solutions that are asymptotically de-Sitter both in the past and future time directions and which undergo accelerated expansion at all times.



Denna post skapades 2015-10-31. Senast ändrad 2015-11-09.
CPL Pubid: 225117

 

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Institutioner (Chalmers)

Institutionen för matematiska vetenskaper, matematik (2005-2016)

Ämnesområden

Matematik
Annan matematik
Astronomi, astrofysik och kosmologi

Chalmers infrastruktur