I am a Postdoctoral researcher at the Cosmology group of Instituto de Física Teórica (IFT) in Madrid, working closely with Dr. Sachiko Kuroyanagi. I am also a member of the LIGO, Virgo, LISA and Euclid collaborations. Before that, I received my PhD from the University of Ioannina with Prof. Leandros Perivolaropoulos as my advisor. This means that I used to be part of this awesome Cosmology group.
My research, thus far, has been focused around the Hubble tension. Without getting too technical this a famous cosmological enigma that has to do with the differences between the values of the expansion rate of the Universe, as they're calculated using different methods. The gist of it, is that all the methods employed should produce the same value give or take, but much to our surprise they DON'T!! Is there a problem with the methodologies used? Is it a hint for new and exciting physics? Who knows? To paraphrase Sidney Coleman, God only knows at the moment and someday I hope you and me as well.
Among others, I'm interested in exploring and analysing cosmological datasets, gravitational waves, theories of modified gravity, dark energy, dark matter and solitons. When I'm not doing physics I enjoy watching movies, some tv series, reading books, programming and cooking for the lucky few that can handle it...
Instituto de Física Teórica (IFT)
C/ Nicolás Cabrera 13-15
Campus de Cantoblanco UAM
28049 Madrid, Spain
alestasg@gmail.com, g.alestas@csic.es
G. Alestas, et al.
Phys.Rev.D 105 (2022) 6, 063538
DOI: 10.1103/PhysRevD.105.063538 , Supplemental Material
G. Alestas, L. Perivolaropoulos
Mon.Not.Roy.Astron.Soc. 504 (2021) 3, 3956-3962
DOI: 10.1093/mnras/stab1070, Supplemental Material
G. Alestas, L. Kazantzidis, L. Perivolaropoulos
Phys.Rev.D 103 (2021) 8, 083517
DOI: 10.1103/PhysRevD.103.083517, Supplemental Material
G. Alestas, L. Kazantzidis, L. Perivolaropoulos
Phys.Rev.D 101 (2020) 12, 123516
DOI: 10.1103/PhysRevD.101.123516, Supplemental Material
As a bonus here is a wordcloud of all the words in every paper I have written...
2021-22
Univ. of Ioannina
Classical Electrodynamics II (6th Semester Core Course – 62).
My duties were:
1. The tutoring of third year students.
2. The grading of weekly assignments.
2021-22
Univ. of Ioannina
Classical Electrodynamics I (5th Semester Core Course – 52).
My duties were:
1. The tutoring of third year students.
2. The grading of weekly assignments.
2021-22
Univ. of Ioannina
Gravity and General Theory of Relativity (Advanced Undergraduate Elective Course – 106).
My duties were:
1. The grading of weekly assignments and reports.
2020-21
Univ. of Ioannina
Cosmology (Advanced Undergraduate Elective Course – 105).
My duties were:
1. The grading of weekly assignments and reports.
2016-17
Univ. of Patras
Astronomy Laboratory (TAE451).
My duties were:
1. The tutoring of third and fourth year students.
2. The grading of weekly assignments and reports.
3. Demonstrating the use of astronomical equipment.