COSMOS-${\it e}'$-GTachyon from String Theory
Sayantan Choudhury, Sudhakar Panda

TL;DR
This paper investigates inflation driven by generalized tachyon fields in string theory, constraining model parameters using recent Planck data and exploring single, assisted, and multi-field scenarios with detailed perturbation analysis.
Contribution
It introduces a modified tachyon action with a parameter q, derives inflationary observables, flow equations, and consistency relations, and compares predictions with observational data.
Findings
Constraints on q, α', g_s, and tachyon mass scale from Planck data
Derived inflationary flow equations and consistency relations
Confirmed compatibility of models with CMB observations
Abstract
In this article, our prime objective is to study the inflationary paradigm from generalized tachyon (GTachyon) living on the world volume of a non-BPS string theory. The tachyon action is considered here is getting modified compared to the original action. One can quantify the amount of the modification via a power instead of in the effective action. Using this set up we study inflation from various types of tachyonic potentials, using which we constrain the index within, , Regge slope , string coupling constant and mass scale of tachyon , from the recent Planck 2015 and Planck+BICEP2/Keck Array joint data. We explicitly study the inflationary consequences from single field, assisted field and multi-field tachyon set up. Specifically for single field and assisted field case we derive the results in the quasi-de-Sitter background in which…
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