Quintom scenario

The Quintom scenario (derived from the words quintessence and phantom, as in phantom energy) is a hypothetical model of dark energy.

Equation of State

In this scenario, the equation of state of the dark energy, relating its pressure and energy density, can cross the boundary associated with the cosmological constant. The boundary separates the phantom-energy-like behavior with from the quintessence-like behavior with .

A no-go theorem[1] shows that this behavior requires at least two degrees of freedom for dark energy models involving ideal gases or scalar fields.

Theoretical Status

If this quintom energy exists, it may indicate how the universe avoids Big Bangs, Big Rips, and other time-like singularities.

The Quintom Scenario was applied in 2008[2] to produce a model of inflationary cosmology with a Big Bounce instead of a Big Bang singularity. It was also applied in 2007 to a Big Bounce model of the universe.

References
  1. Cai, Yi-Fu; Saridakis, Emmanuel N.; Setare, Mohammed R.; Xia, Jun-Qing (22 Apr 2010). "Quintom Cosmology - theoretical implications and observations". Physics Reports. 493 (1): 1–60. arXiv:0909.2776. Bibcode:2010PhR...493....1C. doi:10.1016/j.physrep.2010.04.001. S2CID 118866606.
  2. Cai, Yi-Fu; Qiu, Taotao; Xia, Jun-Qing; Zhang, Xinmin (2009). "A Model of Inflationary Cosmology Without Singularity". Physical Review D. 79 (2): 021303. arXiv:0808.0819. Bibcode:2009PhRvD..79b1303C. doi:10.1103/PhysRevD.79.021303. S2CID 118378803.


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