Now showing items 1-6 of 6

    • Affine inflation 

      Azri, Hemza; Demir, Durmuş Ali (American Physical Society, 2017-06)
      Affine gravity, a gravity theory based on affine connection with no notion of metric, supports scalar field dynamics only if scalar fields have nonvanishing potential. The nonvanishing vacuum energy ensures that the ...
    • Are there really conformal frames? Uniqueness of affine inflation 

      Azri, Hemza (World Scientific Publ Co Pte Ltd, 2018)
      Here, we concisely review the nonminimal coupling dynamics of a single scalar field in the context of purely affine gravity and extend the study to multifield dynamics. The coupling is performed via an affine connection ...
    • Cosmological consequences of a variable cosmological constant model 

      Azri, Hemza; Bounames, A. (World Scientific Publishing, 2017-06)
      We derive a model of dark energy which evolves with time via the scale factor. The equation-of-state is studied as a function of a parameter α introduced in this model as = (1 - 2α)/(1 + 2α). In addition to the recent ...
    • Eddington's gravity in immersed spacetime 

      Azri, Hemza (IOP Publishing, 2015-03-19)
      We formulate Eddington's affine gravity in a spacetime that is immersed in a larger eight-dimensional space endowed with a hypercomplex structure. The dynamical equation of the first immersed Ricci-type tensor leads to ...
    • Induced affine inflation 

      Azri, Hemza; Demir, Durmus (Amer Physical Soc, 2018)
      Induced gravity, metrical gravity in which gravitational constant arises from vacuum expectation value of a heavy scalar, is known to suffer from Jordan frame vs Einstein frame ambiguity, especially in inflationary dynamics. ...
    • Separate Einstein-Eddington spaces and the cosmological constant 

      Azri, Hemza (Wiley, 2016-05-01)
      Based on Eddington affine variational principle on a locally product manifold, we derive the separate Einstein space described by its Ricci tensor. The derived field equations split into two field equations of motion that ...