Observational Constraints on Axions as Quintessence in String Theory

Abstract

We study the observational constraints for the axion models in string theory which can successfully act as quintessence. The evolution of the universe in this model is sensitive to the initial value of the axion field. This initial value of the axion field controls deviation of the cosmic evolution from the ΛCDM behaviour. We use the recent Union2 Supernova Type Ia dataset as well as the data from BAO measurements, the WMAP measurement of the shift parameter and the $H(z)$ measurements. Using these data, the reconstructed equation of state of the axion field has extremely small deviation from the cosmological constant ω= -1 even at 2σconfidence level. One interesting outcome of this analysis is that one can put bound on the SUSY breaking scale using cosmological measurements assuming the values of different string related parameters and vice versa.

9 pages, Revtex file, 6 eps figures, 1 Table

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Cited by in corpus (9)

• On the Cosmological Implications of the String Swampland
• A search for ultra-light axions using precision cosmological data
• Natural Quintessence in String Theory
• Post-Planck Dark Energy Constraints
• Optimal parameterizations for observational constraints on thawing dark energy
• Quantum Fine-Tuning in Stringy Quintessence Models
• Cosmology With Axionic-quintessence Coupled with Dark Matter
• Trans-Planckian censorship constraints on properties and cosmological applications of axion-like fields
• Electroweak Quintessence Axion as Dark Energy