Central European Institute for Cosmology and Fundamental Physics
 

Sabir Ramazanov

PhD: Moscow State University
and Niels Bohr Institute, Copenhagen, 2012
   
2017-  Institute of Physics, Czech Academy of Sciences; Postdoc 
2015-17 Gran Sasso Science Institute, Postdoc
2013-15 Brussels University. Postdoc
   
Email: enmnmnabi@smh.pm
Phone: +420 26605 3028
Address: Office 58
Na Slovance 1999/2
182 21 Praha 8, Czech Republic

My research concerns modifications of gravity and early Universe cosmology.

I elaborate theoretical aspects of physical models and look for their signatures in the cosmological data. Specifically, my contribution includes works on alternatives to the standard Cold Dark Matter scenario (mimetic matter) and inflation (conformal Universe).

I am currently focused on scalar field theories with non-trivial kinetic terms, e.g., k-essence and Horndeski theories. Some of these models are promising in cosmology, as they may trigger the accelerated expansion of the Universe, being at the same time free of ghost instabilities. Still, they may exhibit pathologies already at the classical level, e.g. predict propagation of informaiton faster than the speed of light or lead to the formation of caustic singularities. I am looking for ways of completing these models that are free of those pathologies.

Selected Publications

  • E. Babichev and S. Ramazanov, Caustic free completion of pressureless perfect fluid and k-essence.
    JHEP (2017) [arXiv:1704.03367 [hep-th]].
  • S. Ramazanov, F. Arroja, M. Celoria, S. Matarrese and L. Pilo, Living with ghosts in HoĊ™ava-Lifshitz gravity.
    JHEP (2016) [arXiv:1601.05405 [hep-th]].
  • M. Libanov, S. Ramazanov and V. Rubakov, Scalar perturbations in conformal rolling scenario with intermediate stage.
    JCAP (2011) [arXiv:1102.1390 [hep-th]].

For a complete list of publications see INSPIRE-HEP.