Accelerated Universe from Modified Chaplygin Gas and Tachyonic Fluid
Round 1
Reviewer 1 Report
In this paper, a cosmological model with an exotic fluid, the so-called (modified) Chaplygin gas model to explain the late-time cosmic acceleration (dark energy problem) is explored. In particular, by re-expressing a homogeneous and isotropic cosmological model containing a scalar field, its self-interacting potential is found. In addition, motivated by tachyon field theory, the mapping for this exotic fluid as a normal scalar field theory to a tachyonic field one is demonstrated.
The discussions is interesting and the contents presented would be useful for the related future works. Thus, this paper can be published in Universe.
Reviewer 2 Report
The manuscript has an important history on the subject of modeling cosmology models. In particular the author's proposal of "Modified Chaplygin Gas", which generalizes the Chaplygin Gas model, has had a long discussion and debate in the literature over the last 20 years.The scenario proposes to unify dark matter and dark energy into a single dark fluid, of which at late times behave as dark energy, and to high redshift as dark matter. Despite having been shown to be controversial from an observational point of view over the last few years, this scenario has still attracted a lot of attention in the community. Therefore, given the importance of the manuscript for the literature of cosmological models, I recommend the publication in its present form, without any prior review by the author
Reviewer 3 Report
The author has nicely proposed the modified Chaplygin gas as a candidate of dark energy with its evolution. If modified Chaplygin gas can be seen from the scalar field model, the corresponding scalar field with potential have been derived. Similar motivation has been analyzed for Tachyonic field also. This is a very seminal paper. My recommendation: the paper should be published in the journal "Universe" in the present form.
