Dynamical solution to the problem of a small cosmological constant and late-time cosmic acceleration

By C. Armendariz-Picon, V. Mukhanov, Paul J. Steinhardt. Physical Review Letters, 2000

1,607 citations recorded by the source corpus.

Increasing evidence suggests that most of the energy density of the universe consists of a dark energy component with negative pressure that causes the cosmic expansion to accelerate. We address why this component comes to dominate the universe only recently. We present a class of theories based on an evolving scalar field where the explanation is based entirely on internal dynamical properties of the solutions. In the theories we consider, the dynamics causes the scalar field to lock automatically into a negative pressure state at the onset of matter domination such that the present epoch is the earliest possible time consistent with nucleosynthesis restrictions when it can start to dominate.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/7368b769805a6e8f13c48b23a84ed7bfc291fdbf

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Citations in the corpus

Approaches to understanding cosmic acceleration (2009, background): “In addition to considering the behavior of general potentials for scalar fields, it is also possible to think about the effects of modifying the kinetic term, yielding a class of models called K-essence [92–96].”
Exploring gravitational theories beyond Horndeski (2014, background): “In particular, M, αK , αB and αT respectively parameterize the effective Planck mass, a modification of the scalar kinetic term [34, 35], a kinetic mixing between the scalar and the metric (the so-called braiding) [36, 37, 38, 39] and a tensor speed excess.”
B-inflation (2005, background): “In a cosmological context such a term was considered in [7, 8].”
New Ekpyrotic Cosmology (2007, neutral): “1) were first introduced in cosmology as k-inflation [45] or k-essence models [46] to drive accelerated expansion without potential energy.”
Probing Dark Energy with Baryonic Acoustic Oscillations from Future Large Galaxy Redshift Surveys (2003, background): “…equation of state of −1, while general quintessence models (Caldwell et al. 1998) and other theories (Zlatev et al. 1999; Bucher & Spergel 1999; Armendariz-Picon et al. 2000; Boyle et al. 2001; Gu & Hwang 2001; Kasuya 2001; Bilic et al. 2002; Deffayet et al. 2002; Freese & Lewis 2002)…”