Tachyonization of the $\La$CDM cosmological model

Abstract

In this work a tachyonization of the $\Lambda$CDM model for a spatially flat Friedmann-Robertson-Walker space-time is proposed. A tachyon field and a cosmological constant are considered as the sources of the gravitational field. Starting from a stability analysis and from the exact solutions for a standard tachyon field driven by a given potential, the search for a large set of cosmological models which contain the $\Lambda$CDM model is investigated. By the use of internal transformations two new kinds of tachyon fields are derived from the standard tachyon field, namely, a complementary and a phantom tachyon fields. Numerical solutions for the three kinds of tachyon fields are determined and it is shown that the standard and complementary tachyon fields reproduces the $\Lambda$CDM model as a limiting case. The standard tachyon field can also describe a transition from an accelerated to a decelerated regime, behaving as an inflaton field at early times and as a matter field at late times. The complementary tachyon field always behaves as a matter field. The phantom tachyon field is characterized by a rapid expansion where its energy density increases with time.

Version accepted for publication in GRG

References in corpus (11)

• Dynamics of dark energy
• What is needed of a tachyon if it is to be the dark energy?
• Phantom k-essence cosmologies
• Tachyon dark energy models: dynamics and constraints
• Cosmology with decaying tachyon matter
• An Interacting Dark Energy Model for the Expansion History of the Universe
• Exact solutions for the interacting tachyonic-dark matter system
• Anisotropic k-essence cosmologies
• Interacting fluids generating identical, dual and phantom cosmologies
• Acceleration field of a Universe modeled as a mixture of scalar and matter fields
• Role of Tachyonic Field in Accelerating Universe in Presence of Perfect Fluid

Cited by in corpus (6)

• Analysis cosmological tachyon and fermion model and observation data constraints
• Linking phantom quintessences and tachyons
• Power spectra in extended tachyon cosmologies
• Extended tachyon field using form invariance symmetry
• k-essence and extended tachyons in brane-worlds
• An exotic k-essence interpretation of interactive cosmological models