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 of the dark energy, relating its pressure and energy density, can cross the boundary associated with the cosmological constant. The boundary separates the phantom-energy-like behavior with from the quintessence-like behavior with .

A no-go theorem[1] shows that this behavior requires at least two degrees of freedom for dark energy models involving ideal gases or scalar fields.

Theoretical Status

If this quintom energy exists, it may indicate how the universe avoids Big Bangs, Big Rips, and other time-like singularities.

The Quintom Scenario was applied in 2008[2] to produce a model of inflationary cosmology with a Big Bounce instead of a Big Bang singularity. It was also applied in 2007 to a Big Bounce model of the universe.

gollark: People who take screenshots in lossy image compression formats are total icosahedra.
gollark: It might be automated.
gollark: You seem to have complained about people outside of authoritarian countries disliking them before.
gollark: How weird. I wonder who decided on that.
gollark: Loosely speaking.

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.
  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.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.