Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-05-10
Phys.Lett.B595:1-8,2004
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX file, 13 pages, minor corrections, version to appear in PLB
Scientific paper
10.1016/j.physletb.2004.06.060
We consider finite-time, future (sudden or Big Rip type) singularities which may occur even when strong energy condition is not violated but equation of state parameter is time-dependent. Recently, example of such singularity has been presented by Barrow, we found another example of it. Taking into account back reaction of conformal quantum fields near singularity, it is shown explicitly that quantum effects may delay (or make milder) the singularity. It is argued that if the evolution to singularity is realistic, due to quantum effects the universe may end up in deSitter phase before scale factor blows up. This picture is generalized for braneworld where sudden singularity may occur on the brane with qualitatively similar conclusions.
Nojiri Shin'ichi
Odintsov Sergei D.
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