A tachyonic scalar field with mutually interacting components

Abstract

We investigate the tachyonic cosmological potential $V(\varphi )$ in two different cases of the quasi-exponential expansion of universe and discuss various forms of interaction between the two components---matter and the cosmological constant--- of the tachyonic scalar field, which leads to the viable solutions of their respective energy densities. The distinction among the interaction forms is shown to appear in the $O_m(x)$ diagnostic. Further, the role of the high- and low-redshift observations of the Hubble parameter is discussed to determine the proportionality constants and hence the correct form of matter--cosmological constant interaction.

14 pages

References in corpus (3)

• Two new diagnostics of dark energy
• The imprint of the interaction between dark sectors in large scale cosmic microwave background anisotropies
• $H(z)$ diagnostics on the nature of dark energy

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• Evolution of shifted cosmological parameter and shifted dust matter in a two-phase tachyonic field universe
• Cosmic expansion driven by real scalar field for different forms of potential
• Metamaterial model of tachyonic dark energy