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

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In this scenario, the equation of state p = w ρ {\displaystyle p=w\rho } of the dark energy, relating its pressure and energy density, can cross the boundary  w = − 1 {\displaystyle w=-1} associated with the cosmological constant. The boundary separates the phantom-energy-like behavior with  w < − 1 {\displaystyle w<-1} from the quintessence-like behavior with  w > − 1 {\displaystyle 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

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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.

## External links

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* Dark Energy Constraints from the Cosmic Age and Supernova by Bo Feng, Xiulian Wang and Xinmin Zhang
* Crossing the Phantom Divide by Martin Kunz and Domenico Sapone

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