Astronomy: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 [math]\displaystyle{ p = w\rho }[/math] of the dark energy, relating its pressure and energy density, can cross the boundary [math]\displaystyle{ w = -1 }[/math] associated with the cosmological constant. The boundary separates the phantom-energy-like behavior with [math]\displaystyle{ w \lt -1 }[/math] from the quintessence-like behavior with [math]\displaystyle{ w \gt -1 }[/math]. 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
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. doi:10.1016/j.physrep.2010.04.001. Bibcode: 2010PhR...493....1C.
- ↑ Cai, Yi-Fu; Qiu, Taotao; Xia, Jun-Qing; Zhang, Xinmin (2009). "A Model of Inflationary Cosmology Without Singularity". Physical Review D 79 (2): 021303. doi:10.1103/PhysRevD.79.021303. Bibcode: 2009PhRvD..79b1303C.
fr:Énergie fantôme it:Energia fantasma
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