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Article overview
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Multi-fluid cosmology: An illustration of fundamental principles | | G. L. Comer
; Patrick Peter
; N. Andersson
; | | Date: |
21 Nov 2011 | | Abstract: | Our current understanding of the Universe is based on the interplay of
several distinct "matter" components, which interact mainly through gravity,
and electromagnetic radiation. The nature of the different components, and
possible interactions, tends to be based on the notion of coupled perfect
fluids (or scalar fields). This approach is somewhat naive, especially if one
wants to be able to consider issues involving heat flow, dissipative
mechanisms, or Bose-Einstein condensation of dark matter. We argue that a more
natural starting point would be the multi-purpose variational relativistic
multi-fluid system that has so far mainly been applied to neutron star
astrophysics. As an illustration of the fundamental principles involved, we
develop the formalism for determining the cosmological solutions to the
Einstein equations for a general relativistic two-fluid model for (coupled)
matter and radiation. The two fluids in the model are allowed to interpenetrate
and exhibit a relative flow with respect to one another, implying, in general,
an anisotropic Universe. We demonstrate that, when one fluid dominates over the
other, one recovers the usual Friedmann-Lema^{i}tre-Robertson-Walker
solution. We also show that the transition between one fluid domination and the
other’s occurs during a Bianchi I epoch, possibly imprinting observable
consequences at the specific scale corresponding to the transition time. | | Source: | arXiv, 1111.5043 | | Services: | Forum | Review | PDF | Favorites | |
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