Unifying Inflation and DE/DM from Multi Field in a spontaneously broken scale invariant TMT

Eduardo Guendelman, Ramon Herrera

Research output: Working paper/PreprintPreprint

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A two scalar field model that incorporates the Two Measures Theory (TMT) is introduced, in order to unify the early and present universe. We define the scale invariant couplings of the scalar fields to the different measures through exponential potentials. Spontaneous breaking of scale invariance takes place when integrating the fields that define the measures. When going to the Einstein frame we obtain: (i) An effective potential for the scalar fields with three flat regions which allows for a unified description of both early universe inflation (in the higher energy density flat region) as well as of present dark energy epoch which can be realized with a double phase, i.e., in two flat regions. (ii) In the slow roll inflation, only one field combination the ``dilaton", which transforms under scale transformations, has non trivial dynamics, the orthogonal one, which is scale invariant remains constant. The corresponding perturbations of the dilaton are calculated. (iii) For a reasonable choice of the parameters the present model perturbations conforms to the Planck Collaboration data. (iv) In the late universe we define scale invariant couplings of Dark Matter to the dilaton.(v) We calculate the evolution of the late universe under these conditions with the realization of two different possible realizations of $\Lambda$CDM type scenarios depending of the flat region in the late universe. These two phases could appear at different times in the history of the universe.(vi) From the Planck data, we find the constraints on the parameters during the inflationary epoch and these values are used to obtain constraints relevant to the present epoch.
Original languageEnglish
StatePublished - 17 Jan 2022


  • gr-qc
  • astro-ph.CO
  • hep-th


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