Please use this identifier to cite or link to this item: https://www.um.edu.mt/library/oar/handle/123456789/121539
Title: Strengthening extended gravity constraints with combined systems : ƒ (R) bounds from cosmology and the galactic center
Authors: Dialektopoulos, Konstantinos F.
Said, Jackson
Oikonomopoulou, Zinovia
Keywords: Dark energy (Astronomy)
Cosmology
Gravity
General relativity (Physics)
Gravitational fields
Galactic center
Issue Date: 2023
Publisher: Elsevier BV
Citation: Benisty, D., Mifsud, J., Said, J. L., & Staicova, D. (2023). Strengthening extended gravity constraints with combined systems: ƒ (R) bounds from cosmology and the galactic center. Physics of the Dark Universe, 42, 101350.
Abstract: Extended gravity is widely constrained in different astrophysical and astronomical systems. Since these different systems are based on different scales it is not trivial to get a combined constraint that is based on different phenomenology. Here, for the first time (to the best of our knowledge), we combine constraints for gravity from late time Cosmology and the orbital motion of the stars around the galactic center. gravity models give different potentials that are tested directly in the galactic center. The cosmological data set includes the type Ia supernova and baryon acoustic oscillations. For the galactic star center data set we use the published orbital measurements of the S2 star. The constraints on the universal parameter from the combined system give: for the Hu–Sawicki model, while for the Starobinsky dark energy model. These results improve on the cosmological results we obtain. The results show that combined constraint from different systems yields a stronger constraint for different theories under consideration. Future measurements from the galactic center and from cosmology will give better constraints on models with gravity.
URI: https://www.um.edu.mt/library/oar/handle/123456789/121539
ISSN: 22126864
Appears in Collections:Scholarly Works - InsSSA



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