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 $p=w\rho$ of the dark energy, relating its pressure and energy density, can cross the boundary $w=-1$ associated with the cosmological constant. The boundary separates the phantom-energy-like behavior with $w<-1$ from the quintessence-like behavior with $w>-1$ . A no-go theorem shows that this behavior requires at least two degrees of freedom for dark energy models involving ideal gases or scalar fields.^[1]

The Quintom scenario was applied in 2008 to produce a model of inflationary cosmology with a Big Bounce instead of a Big Bang singularity.^[2]

References

^ 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.
^ 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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[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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