Cosmological perturbations in the teleparallel analog of Horndeski gravity
Ahmedov B. Dialektopoulos K.F. Levi Said J. Nosirov A. Oikonomopoulou Z. Yunusov O.
1 August 2023Institute of Physics
Journal of Cosmology and Astroparticle Physics
2023#2023Issue 8
In this work we study the cosmological perturbations in Bahamonde-Dialektopoulos-Levi Said (BDLS) theory, i.e. the teleparallel analog of Horndeski gravity. In order to understand the evolution of structure in a cosmological model, it is necessary to study its cosmology not only in the background but also perturbatively. Both Horndeski and its teleparallel analog have been analyzed a lot in the literature, but in order to study them quantitatively, we need to know their cosmological perturbations. That is why, we study here the scalar-vector-tensor decomposition of the theory and we also express the so-called alpha parameters in terms of the arbitrary functions of the theory, that designate the deviation from the ΛCDM model. We have explored tensor, vector and scalar perturbation of the action up to second order, which drastically opens up new possibilities on searches in the parameter space of scalar-tensor theories in the context of observations.
cosmological perturbation theory , Cosmological perturbation theory in GR and beyond , cosmology of theories beyond the SM , modified gravity
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Institute of Fundamental and Applied Research, National Research University TIIAME, Kori Niyoziy 39, Tashkent, 100000, Uzbekistan
National University of Uzbekistan, Tashkent, 100174, Uzbekistan
Department of Mathematics and Computer Science, Transilvania University of Brasov, Brasov, 500091, Romania
Laboratory of Physics, Faculty of Engineering, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece
Department of Physics, Nazarbayev University, 53 Kabanbay Batyr avenue, Astana, 010000, Kazakhstan
Institute of Space Sciences and Astronomy, University of Malta, Malta, MSD 2080, Malta
Department of Physics, University of Malta, Malta, Malta
New Uzbekistan University, Mustaqillik ave. 54, Tashkent, 100007, Uzbekistan
Ulugh Beg Astronomical Institute, Astronomy St. 33, Tashkent, 100052, Uzbekistan
Institute of Fundamental and Applied Research
National University of Uzbekistan
Department of Mathematics and Computer Science
Laboratory of Physics
Department of Physics
Institute of Space Sciences and Astronomy
Department of Physics
New Uzbekistan University
Ulugh Beg Astronomical Institute
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