Hessence: a new view of quintom dark energy

By Hao Wei, R. Cai, Ding-fang Zeng. 2005

308 citations recorded by the source corpus.

Recently a lot of attention has been given to building a dark energy model in which the equation-of-state parameter w can cross the phantom divide w = −1. One of the models to realize crossing the phantom divide is called the quintom model, in which two real scalar fields appear, one is a normal scalar field and the other is a phantom-type scalar field. In this paper we propose a non-canonical complex scalar field as the dark energy, which we dub ‘hessence’, to implement crossing the phantom divide, in a similar sense as the quintom dark energy model. In the hessence model, the dark energy is described by a single field with an internal degree of freedom rather than two independent real scalar fields. However, the hessence is different from an ordinary complex scalar field, we show that the hessence can avoid the difficulty of the Q-ball formation which gives trouble to the spintessence model (an ordinary complex scalar field acts as the dark energy). Furthermore, we find that, by choosing a proper potential, the hessence could correspond to a Chaplygin gas at late times.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/83abc4a1e073481e57ce8061d5f67039310f87da

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Citations in the corpus

Constraints on holographic dark energy from the latest supernovae, galaxy clustering, and cosmic microwave background anisotropy observations (2007, background): “Numerous other candidates for dark energy have also been proposed in the literature, such as an evolving canonical scalar field [14, 15, 16, 17, 18, 19] usually referred to as quintessence, the phantom energy [20, 21, 22] with an equation-of-state smaller than −1 violating the weak energy condition,”
Stability of phantom wormholes (2005, background): “However, recent fits to supernovae, CMB and weak gravitational lensing data indicate that an evolving equation of state ω crossing the phantom divide−1, is mildly favored, and several models have been proposed in the literature [6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16].”