Central European Institute for Cosmology and Fundamental Physics

Gizem Şengör

PhD:  Syracuse University, 2018
2019-  Institute of Physics, Czech Academy of Sciences; Postdoc 
Email: fratbe@smh.pm
Phone: +420 26605 2173
Address: Office 240
Na Slovance 1999/2
182 21 Praha 8, Czech Republic

My research interests lie in cosmological perturbation theory and how symmetries work at the level of perturbations. Recently I have worked on BRST quantization methods for cosmological perturbations after gauge fixing and effective field theory methods with applications to the epochs of preheating and dark energy. Understanding how diffeomorphisms are realized at the level of perturbations was the crucial point in both these lines of work. 

Currently I am interested in de Sitter spacetime and its conformal symmetries. I am especially curious to understand how de Sitter can be expressed as a conformal field theory (CFT), what type of deformations of de Sitter and hence its corresponding CFT captures cosmological perturbations in the early and late universe individually, how these deformations can be tied to nonlinearly realized diffeomorphisms and in this formalism how the time dependence of the background during the passage out of inflation in the early universe and towards dark energy domination in the late time universe can be expressed as a renormalization group flow away from and towards the de Sitter fixed point respectively.

Selected Publications
  • O. Özsoy, J. T. Giblin, E. Nesbit, G. Şengör and S. Watson, Toward an Effective Field Theory Approach to Reheating,
    Phys.Rev. D (2017) [arXiv:1701.04155 [hep-th]]

For a complete list of publications see INSPIRE-HEP.