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Gaugessence: a dark energy model with early time radiation-like equation of state

  • Ahmad Mehrabi
  • Azade Maleknejad
  • Vahid Kamali
Original Article

Abstract

In this work, we study a new quintessence model associated with non-Abelian gauge fields, minimally coupled to Einstein gravity. This gauge theory has been recently introduced and studied as an inflationary model, called gauge-flation. Here, however, we are interested in the late time cosmology of the model in the presence of matter and radiation to explain the present time accelerating Universe. During the radiation and matter eras, the gauge field tracks radiation and basically acts like a dark radiation sector. As we approach lower redshifts, the dark component takes the form of a dark energy source which eventually becomes the dominate part of the energy budget of the Universe. Due to the tracking feature of our model, solutions with different initial values are attracted to a common trajectory. The existence of early dark radiation is a robust prediction of our model which contributes to the effective number of relativistic species, \(N_{eff}\) and has its own interesting observational features.

Keywords

Gauge field Dark energy Observational data 

Notes

Acknowledgements

We thank the anonymous referee whose comments helped to improve the paper. In addition, we greatly appreciate M.M. Sheikh-Jabbari for his valuable comments on the manuscript. Work of A. Maleknejad is supported in part by the grant from Boniad Melli Nokhbegan of Iran. A. Maleknejad acknowledges the hospitality of the Aspen Center for Physics and support from PHY-1066293.

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.Department of PhysicsBu-Ali Sina UniversityHamedanIran
  2. 2.School of PhysicsInstitute for Research in Fundamental Sciences (IPM)TehranIran

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