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IPM
30
YEARS OLD

“School of Astronomy”

Paper   IPM / Astronomy / 15598
   School of Astronomy
  Title: Two-field disformal transformation and mimetic cosmology
  Author(s):
1 . Hassan. Firouzjahi
2 . Mohammad Ali. Gorji
3 . Seyed Ali . Hosseini Mansoori
4 . Asieh. Karami
5 . Tahereh. Rostami
  Status: Published
  Journal: JCAP
  Vol.: 2018
  Year: 2018
  Supported by:           ipm IPM
  Abstract:
We extend the disformal transformation to models with two scalar fields and look at its singular limit. Solving the eigentensor equation for the Jacobian of the transformation of the metrics we find the two-field extension of the mimetic scenario in the singular conformal limit. At the background level the setup mimics the roles of dark matter cosmology. We decompose the perturbations into the adiabatic and entropy modes in which the adiabatic perturbation is tangential to the classical trajectory while the entropy mode is perpendicular to it. We show that the adiabatic mode is frozen while the entropy mode propagates with the sound speed equal to unity with no instabilities

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