Quintom scenario

In this scenario, the equation of state $p\; =\; w\backslash rho$ 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 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.{{cite journal|last1=Cai|first1=Yi-Fu|last2=Saridakis|first2=Emmanuel N.|last3=Setare|first3=Mohammed R.|last4=Xia|first4=Jun-Qing|date=22 Apr 2010|title=Quintom Cosmology - theoretical implications and observations|journal=Physics Reports|volume=493|issue=1|pages=1–60|arxiv=0909.2776|doi=10.1016/j.physrep.2010.04.001|bibcode=2010PhR...493....1C|s2cid=118866606}}

The Quintom scenario was applied in 2008 to produce a model of inflationary cosmology with a Big Bounce instead of a Big Bang singularity.{{cite journal |last1=Cai |first1=Yi-Fu |last2=Qiu |first2=Taotao |last3=Xia |first3=Jun-Qing |last4=Zhang |first4=Xinmin |journal= Physical Review D | volume=79 |issue=2 |pages=021303 | doi=10.1103/PhysRevD.79.021303 | year=2009 |title=A Model of Inflationary Cosmology Without Singularity |arxiv=0808.0819|bibcode=2009PhRvD..79b1303C |s2cid=118378803 }}

{{reflist}}

• [https://arxiv.org/abs/astro-ph/0404224 Dark Energy Constraints from the Cosmic Age and Supernova by Bo Feng, Xiulian Wang and Xinmin Zhang]
• [https://arxiv.org/abs/astro-ph/0609040 Crossing the Phantom Divide by Martin Kunz and Domenico Sapone]

Category:Dark energy

{{physical-cosmology-stub}}

fr:Énergie fantôme

it:Energia fantasma