George Alestas

169170829_941333223307295_2258371804684935189_n (1)

Personal Information

(+30) 26510 - 08451
g.alestas@uoi.gr
alestasg
GeorgeAlestas
Full CV
Personal Website

Research Interests

My main research interests include theoretical and astrophysical aspects of Cosmology, H0 tension, cosmological parameter inference and data analysis, modified gravity theories (extensions of General Relativity) and solitons.

Short Curriculum Vitae

Education



2018 – Present   
Ph.D. in Physics
                               Thesis Title: “ΛCDM and the Implications of the Hubble Tension”
                               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

Scholarships/Grants



2021 – 2022   
Fellow of the Greek State and the European Union (European Social Fund – ESF) through the Operational Programme                                                               
“Competitiveness, Entrepreneurship and Innovation 2014-2020 (EPAnEK)”
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”
2020                  European Cooperation in Science & Technology (COST) grant for a short term scientific mission (STSM) in the context
                           of the action “CA15117 – Cosmology and Astrophysics Network for Theoretical Advances and Training Actions
                           (CANTATA)” and the project “Search for Hints of Modified Gravity in Cosmological Data”

Computer Skills


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

Languages


Greek        Native
English     B2 Level (University of Michigan)

Collaborations 


Snowmass2022

Peer Review 


Monthly Notices of the Royal Astronomical Society (MNRAS)

Societies


2021 – Present    Student Member of the American Physical Society (APS)
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.

Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
E. Di Valentino et al., Contribution to the 2022 Snowmass Summer Study
JHEAp 34 (2022) 49-211
DOI: 10.1016/j.jheap.2022.04.002


Constraining a late time transition of Geff  using low-z galaxy survey data
G. Alestas,  L. Perivolaropoulos and K. Tanidis
arXiv: 2201.05846, Supplemental Material


Late-transition vs smooth H(z) deformation models for the resolution of the Hubble crisis
G. Alestas, D. Camarena, E. Di Valentino, L. Kazantzidis, V. Marra, S. Nesseris and L. Perivolaropoulos
Phys. Rev. D 105, 063538
DOI: 10.1103/PhysRevD.105.063538, Supplemental Material


Hints for a gravitational constant transition in Tully-Fisher data
G. Alestas, I. Antoniou and L. Perivolaropoulos
Universe 7 (2021) 366
DOI: 10.3390/universe7100366, Supplemental Material


Late time approaches to the Hubble tension deforming H(z), worsen the growth tension
G. Alestas, L. Perivolaropoulos
Mon.Not.Roy.Astron.Soc. 504 (2021) 3, 3956-3962
DOI: 10.1093/mnras/stab1070, Supplemental Material


A w – M phantom transition at zt<0.1 as a resolution of the Hubble tension
G. Alestas, L. Kazantzidis, L. Perivolaropoulos
Phys.Rev.D 103 (2021) 8, 083517
DOI: 10.1103/PhysRevD.103.083517, 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) 10, 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

Experience

 

Teaching Assistance


Spring Semester 2021 – 22                       Classical Electrodynamics II (6th Semester Core Course – 62)
                                                                         Department of Physics, University of Ioannina, Greece
Winter Semester 2021 – 22                       Gravity and General Theory of Relativity (Advanced Undergraduate Elective Course – 106)
                                                                         Department of Physics, University of Ioannina, Greece
Winter Semester 2021 – 22                       Classical Electrodynamics I (5th Semester Core Course – 52)
                                                                         Department of Physics, University of Ioannina, Greece
Spring Semester 2020 – 21                       Cosmology (Advanced Undergraduate Elective Course – 105)
                                                                         Department of Physics, University of Ioannina, Greece
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