Quintom scenario explained

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

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]

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

Notes and 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. 0909.2776. 10.1016/j.physrep.2010.04.001. 2010PhR...493....1C. 118866606.
2. Cai . Yi-Fu . Qiu . Taotao . Xia . Jun-Qing . Zhang . Xinmin . Physical Review D . 79 . 2 . 021303 . 10.1103/PhysRevD.79.021303 . 2009 . A Model of Inflationary Cosmology Without Singularity . 0808.0819. 2009PhRvD..79b1303C . 118378803 .