George Alestas


Personal Information

(+30) 26510 - 08451

Research Interests

My main research interests include theoretical and astrophysical aspects of cosmology, gravitational physics (e.g. lensing phenomena), modified gravity theories (extensions of General Relavity), solitons and cosmological data analysis.

Short Curriculum Vitae



2018 – Present   
Ph.D. in Physics
                               Thesis Title: “Solitons: Spacetime evolution, gravitational properties, and cosmological observational predictions”
                               Department of Physics, University of Ioannina
2015 – 2017        Postgraduate Studies (M.Sc.) in Theoretical and Mathematical Physics
                               Graduated with an overall grade of 8.87/10.00
                               Department of Physics, University of Patras
2010 – 2014        Bachelor of Science (B.Sc.) in Physics
                               Department of Physics, University of Patras


2020 – 2021    Fellow of the Greek State and the European Union (European Social Fund – ESF) through the Operational Programme                                                               ”Human Resources Development, Education and Lifelong Learning 2014-2020”

Computer Skills

Operating Systems     Windows & Linux
Python, C, C++, Fortran
Scientific Software     CAMB, MGCAMB, COSMOMC, MGCOSMOMC, Wolfram Mathematica, LaTeX


Greek        Native
English     B2 Level (University of Michigan)


2020 – Present    Junior Member of the Hellenic Society on Relativity, Gravitation and Cosmology

Publication Record

For the full list of my publications please visit the inspirehep database.

A w phantom transition at zt<0.1 as a resolution of the Hubble tension
G. Alestas, L. Kazantzidis, L. Perivolaropoulos,
arXiv:2012.13932, Supplemental Material

Existence and Stability of Static Spherical Fluid Shells in a Schwarzschild-Rindler-anti-de Sitter Metric
G. Alestas, G.V. Kraniotis, L. Perivolaropoulos
Phys.Rev.D 102 (2020) 104015
DOI: 10.1103/PhysRevD.102.104015Supplemental Material

H0 tension, phantom dark energy, and cosmological parameter degeneracies
G. Alestas, L. Kazantzidis, L. Perivolaropoulos
Phys.Rev.D 101 (2020) 12, 123516
DOI: 10.1103/PhysRevD.101.123516, Supplemental Material

Evading Derrick’s theorem in curved space: Static metastable spherical domain wall
G. Alestas, L. Perivolaropoulos
Phys.Rev.D 99 (2019) 6, 064026
DOI: 10.1103/PhysRevD.99.064026Supplemental Material



Teaching Assistance

Winter Semester 2020 – 21                       Gravity and General Theory of Relativity (Advanced Undergraduate Elective Course – 106)
                                                                         Department of Physics, University of Ioannina, Greece
Winter Semester 2019 – 20                       Classical Electrodynamics I (5th Semester Core Course – 52)
                                                                         Department of Physics, University of Ioannina, Greece
Winter Semester 2016 – 17                       Astronomy Lab (TAE451)
                                                                         Department of Physics, University of  Patras, Greece
Spring Semester 2016 – 17                       Astrophysics Lab (TAE450)
                                                                         Department of Physics, University of  Patras, Greece