Dark energy condensation

By M. Pietroni. 2005

140 citations recorded by the source corpus.

The two most popular candidates for dark energy, i.e. a cosmological constant and quintessence, are very difficult to distinguish observationally, mostly because the quintessence field does not have sizable fluctuations. We study a scalar field model for dark energy in which the scalar field is invariant under reflection symmetry {phi}{yields}-{phi}. Under general assumptions, there is a phase transition at late times (z < or approx. 0.5). Before the phase transition, the field behaves as a cosmological constant. After the phase transition, a time-dependent {phi}-condensate forms, the field couples with dark matter and develops sizable perturbations tracking those of dark matter. The background cosmological evolution is in agreement with existing observations, but might be clearly distinguished from that of a cosmological constant by future Supernovae surveys. The growth of cosmological perturbations carries the imprint of the phase transition, however a nonlinear approach has to be developed in order to study it quantitatively.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3a3e4fd4f99e8831686566bc4ffdec2852773fbe

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. F. Vernizzi
2. J. Khoury
3. Kurt Hinterbichler
4. J. Gleyzes
5. P. Creminelli
6. Tsutomu Kobayashi
7. K. Koyama
8. M. Simonovi'c

In Nuclear and High Energy Physics

1. F. Vernizzi
2. J. Khoury
3. Kurt Hinterbichler
4. P. Creminelli
5. J. Gleyzes
6. M. Simonovi'c
7. A. Matas
8. Aaron Levy

Citations in the corpus

• Single-field consistency relations of large scale structure part II: resummation and redshift space (2013, background): “For chameleon [27] or symmetron [28, 29, 30] screening the EP violation can be of order unity between screened and unscreened objects.”
• Symmetron Cosmology (2011, background): “Recently, two of us have proposed a third screening mechanism, called the symmetron [87], based in part on earlier work [88, 89].”