22 citations · 23 across the 3 of their papers we have counts for
3 papers
nlin.PS2023
Nonlinear instability and solitons in a self-gravitating fluid
G. N. Koutsokostas, S. Sypsas, O. Evnin +2
We study a spherical, self-gravitating fluid model, which finds applications in cosmic structure formation. We argue that since the system features nonlinearity and gravity-induced…
hep-th2014★ 22 cited
Higher derivatives and power spectrum in effective single field inflation
Jinn-Ouk Gong, Min-Seok Seo, Spyros Sypsas
We study next-to-leading corrections to the effective action of the curvature perturbation obtained by integrating out the coupled heavy isocurvature perturbation. These correction…
hep-th2014★ 1 cited
Theoretical and Observational Constraints on Brane Inflation and Study of Scalar Perturbations through the Effective Field Theory Formalism
Spyros Sypsas
In this thesis, consisting of two main parts, we study observational signatures of cosmic (super)strings in the context of D-brane inflation and properties of scalar perturbations…