Journal of High Energy Physics

, 2014:151 | Cite as

Inflation from Minkowski space

  • David Pirtskhalava
  • Luca Santoni
  • Enrico Trincherini
  • Patipan Uttayarat
Open Access
Regular Article - Theoretical Physics


We propose a class of scalar models that, once coupled to gravity, lead to cosmologies that smoothly and stably connect an inflationary quasi-de Sitter universe to a low, or even zero-curvature, maximally symmetric spacetime in the asymptotic past, strongly violating the null energy condition \( \left(\overset{\cdot }{H}\gg {H}^2\right) \) at intermediate times. The models are deformations of the conformal galileon lagrangian and are therefore based on symmetries, both exact and approximate, that ensure the quantum robustness of the whole picture. The resulting cosmological backgrounds can be viewed as regularized extensions of the galilean genesis scenario, or, equivalently, as ‘early-time-complete’ realizations of inflation. The late-time inflationary dynamics possesses phenomenologically interesting properties: it can produce a large tensor-to-scalar ratio within the regime of validity of the effective field theory and can lead to sizeable equilateral nongaussianities.


Cosmology of Theories beyond the SM Classical Theories of Gravity Effective field theories 


Open Access

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Copyright information

© The Author(s) 2014

Authors and Affiliations

  • David Pirtskhalava
    • 1
  • Luca Santoni
    • 1
  • Enrico Trincherini
    • 1
    • 2
  • Patipan Uttayarat
    • 3
    • 4
  1. 1.Scuola Normale SuperiorePisaItaly
  2. 2.INFN - Sezione di PisaPisaItaly
  3. 3.Department of PhysicsUniversity of CincinnatiCincinnatiU.S.A.
  4. 4.Department of PhysicsSrinakharinwirot UniversityBangkokThailand

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