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

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

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.

External links

• 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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