The Universe Dynamics in the Tachyon Cosmology With Non-Minimal Coupling to Matter

Abstract

Recently, the tachyon cosmology has been represented as dark energy model to support the current acceleration of the universe without phantom crossing. In this paper, we study the dynamics of the tachyon cosmology in which the field plays the role of tachyon field and also non-minimally coupled to the matter lagrangian. The model shows current universe acceleration and also phantom crossing in the future. Two cosmological tests are also performed to validate the model; the difference in the distance modulus and the model independent Cosmological Redshift Drift (CRD) test.

Holographic dark energy in chameleon tachyon cosmology

“…We consider the chameleon gravity in the presence of CDM with a tachyon potential in the action given by [6][7],…”

Logamediate inflation by tachyon field

“…where Z s = V (1−φ 2 ) −3/2 [27]. Applying slow-roll approximation in (18) and using equations (10) and (11), one can obtain…”

Generalized second law of thermodynamics with corrected entropy in tachyon cosmology

“…If there is no energy exchange between outside and inside of the apparent horizon, thermal equilibrium occurs that T = T h . Therefore, in the case of thermal equilibrium, the relation (11) gives…”

“…It is most often the case that such fields interact with matter, i) directly due to a Lagrangian coupling, ii) indirectly through a coupling to the Ricci scalar or as the result of quantum loop corrections [6][7][8][9]. Recently, a new case has been proposed in which a tachyon scalar field non-minimally couples to matter Lagrangian and the validity of this model in many scenarios has been investigated [10][11][12][13][14][15].…”