Cosmic antifriction and accelerated expansion

By Winfried Zimdahl, D. Schwarz, A. Balakin, D. Pavón. 2000

254 citations recorded by the source corpus.

We explain an accelerated expansion of the present Universe, suggested from observations of supernovae of type la at high redshift, by introducing an antifrictional force that is self-consistently exerted on the particles of the cosmic substratum. Cosmic antifriction. which is intimately related to "particle production," is shown to give rise to an effective negative pressure of the cosmic medium. While other explanations for an accelerated expansion (cosmological constant, quintessence) introduce a component of dark energy in addition to "standard" cold dark matter (CDM) we resort to a phenomenological one-component model of CDM with internal self-interactions. We demonstrate how the dynamics of the cold dark matter model with a cosmological constant may be recovered as a special case of cosmic antifriction. We discuss the connection with two-component models and obtain an attractor behavior for the ratio of the energy densities of both components which provides a possible phenomenological solution to the coincidence problem.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/abc65a8546db90870c3984e22ffdfab93c9900aa

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Citations in the corpus

Could dark energy be vector-like? (2004, background): “have suggested that a (timelike) vector force could be responsible for the present acceleration of the universe [27].”
Dark Energy from structure: a status report (2007, background): “Third, backreaction is a genuinely non–equili brium phenomenon, thus, opening this subject also to the language of non–equil ibri m thermodynamics [157], [176], [200], general questions of gravitationa l entropy [152], [153], [24], [96], [135], and observational measures using distan ces to equilibr”
Dark energy from backreaction (2003, background): “Indeed, the relation Ωde ≈ 2 Ωcdm suggests a connection between dark energy and dark matter, and motivates the construction of models of unified, or coupled, dark matter and dark energy [10, 11, 12, 13, 14, 15, 16].”
The Cosmological Constant and Dark Energy (2002, background): “More recent discussions of this and related models may be found in John and Joseph (2000), Zimdahl et al. (2001), Dalal et al. (2001), Gudmundsson and Björnsson (2002), Bean and Melchiorri (2002), Mak, Belinchón, and Harko (2002), and Kujat et al. (2002), through which other recent work may be…”