COSMOS-${\it e}'$-GTachyon from String Theory

Understand

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 $q$ instead of $1/2$ in the effective action.
• Using this set up we study inflation from various types of tachyonic potentials, using which we constrain the index $q$ within, $1/2<q<2$, Regge slope $\alpha^{'}$, string coupling constant $g_{s}$ and mass scale of tachyon $M_s$, from the recent Planck 2015 and Planck+BICEP2/Keck Array joint data.