Worse than a big rip?
Abstract
We show that a generalised phantom Chaplygin gas can present a future singularity in a finite future cosmic time. Unlike the big rip singularity, this singularity happens for a finite scale factor, but like the big rip singularity, it would also take place at a finite future cosmic time. In addition, we define a dual of the generalised phantom Chaplygin gas which satisfies the null energy condition. Then, in a RandallSundrum 1 braneworld scenario, we show that the same kind of singularity at a finite scale factor arises for a brane filled with a dual of the generalised phantom Chaplygin gas.
 Publication:

Physics Letters B
 Pub Date:
 January 2008
 DOI:
 10.1016/j.physletb.2007.10.079
 arXiv:
 arXiv:grqc/0612135
 Bibcode:
 2008PhLB..659....1B
 Keywords:

 Dark energy;
 Future singularities;
 Cosmology with extra dimensions;
 98.80.k;
 95.36.+x;
 Cosmology;
 Dark energy;
 General Relativity and Quantum Cosmology
 EPrint:
 6 pages, 4 figures, RevTeX 4. Discussion expanded and references added. Version to appear in PLB