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Dark energy without fine tuning

A preprint version of the article is available at arXiv.

Abstract

We present a two-field model that realises inflation and the observed density of dark energy today, whilst solving the fine-tuning problems inherent in quintessence models. One field acts as the inflaton, generically driving the other to a saddle-point of the potential, from which it acts as a quintessence field following electroweak symmetry breaking. The model exhibits essentially no sensitivity to the initial value of the quintessence field, naturally suppresses its interactions with other fields, and automatically endows it with a small effective mass in the late Universe. The magnitude of dark energy today is fixed by the height of the saddle point in the potential, which is dictated entirely by the scale of electroweak symmetry breaking.

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Correspondence to Tommi Markkanen.

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ArXiv ePrint: 1905.00045

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Camargo-Molina, J.E., Markkanen, T. & Scott, P. Dark energy without fine tuning. J. High Energ. Phys. 2019, 44 (2019). https://doi.org/10.1007/JHEP10(2019)044

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Keywords

  • Classical Theories of Gravity
  • Cosmology of Theories beyond the SM