PPN Motion of S-Stars Around Sgr A*

Gainutdinov, R. I.

doi:10.1007/s10511-020-09651-2

Cited by 12 publications

(3 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nowadays, there are more recent and precise observations not only of S2 star, but also of several other members of the S-star cluster, such as S38, S55 and S62 [35, 67, 103, 104] and thus it is possible to perform the orbital analysis of these stars (see e.g. [105][106][107][108][109][110][111][112][113][114][115]).…”

Section: Jcap03(2023)056mentioning

confidence: 99%

Constraints on Yukawa gravity parameters from observations of bright stars

Jovanović

Borka

2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

In this paper we investigate a Yukawa gravity modification of the Newtonian gravitational potential in a weak field approximation. For that purpose we derived the corresponding equations of motion and used them to perform two-body simulations of the stellar orbits. In 2020 the GRAVITY Collaboration detected the orbital precession of the S2 star around the supermassive black hole (SMBH) at the Galactic Center (GC) and showed that it is close to the general relativity (GR) prediction. Using this observational fact, we evaluated parameters of the Yukawa gravity (the range of Yukawa interaction Λ and universal constant δ) with the Schwarzschild precession of the S-stars assuming that the observed values as indicated by the GRAVITY Collaboration will have a small deviation from GR prediction [1]. GR provides the most natural way to fit observational data for S-star orbits, however, their precessions can be fitted by Yukawa gravity. Our main goal was to study the possible influence of the strength of Yukawa interaction, i.e. the universal constant δ, on the precessions of S-star orbits. We analyze S-star orbits assuming different strength of Yukawa interaction δ and find that this parameter has strong influence on range of Yukawa interaction Λ. For that purpose we use parameterized post-Newtonian (PPN) equations of motion in order to calculate the simulated orbits of S-stars in GR and Yukawa gravity. Using MCMC simulations we obtain the best-fit values and uncertainties of Yukawa gravity parameters for S-stars. Also, we introduce a new criterion which can be used for classification of gravitational systems in this type of gravity, according to their scales. We demonstrated that performed analysis of the observed S-stars orbits around the GC in the frame of the Yukawa gravity represent a tool for constraining the Yukawa gravity parameters and probing the predictions of gravity theories.

show abstract

Section: Jcap03(2023)056mentioning

confidence: 99%

Constraints on Yukawa gravity parameters from observations of bright stars

Jovanović

Borka

2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…Here, we study the trajectories of S-stars orbiting the central SMBH of our Galaxy, in the frame of Yukawa gravity using the modified PPN formalism [57][58][59][60]. Our present research is the continuation of our previous investigations of different extended gravity theories, where we used astrometric observations for S-star orbits [51][52][53][54][55][61][62][63][64][65][66][67][68][69][70][71][72].…”

Section: Introductionmentioning

confidence: 97%

Constraints on Graviton Mass from Schwarzschild Precession in the Orbits of S-Stars around the Galactic Center

Jovanović,

Borka Jovanović,

Borka

et al. 2024

Symmetry

View full text Add to dashboard Cite

In this paper we use a modification of the Newtonian gravitational potential with a non-linear Yukawa-like correction, as it was proposed by C. Will earlier to obtain new bounds on graviton mass from the observed orbits of S-stars around the Galactic Center (GC). This phenomenological potential differs from the gravitational potential obtained in the weak field limit of Yukawa gravity, which we used in our previous studies. We also assumed that the orbital precession of S-stars is close to the prediction of General Relativity (GR) for Schwarzschild precession, but with a possible small discrepancy from it. This assumption is motivated by the fact that the GRAVITY Collaboration in 2020 and in 2022 detected Schwarzschild precession in the S2 star orbit around the Supermassive Black Hole (SMBH) at the GC. Using this approach, we were able to constrain parameter λ of the potential and, assuming that it represents the graviton Compton wavelength, we also found the corresponding upper bound of graviton mass. The obtained results were then compared with our previous estimates, as well as with the estimates of other authors.

show abstract

“…The aim of this paper is to constrain the upper bound for the graviton mass and to probe the predictions of GR by analysis of the stellar orbits around GC in the framework of Yukawa gravity, and taking into account the recent detection of Schwarzschild precession in the orbit of S2 star. For that purpose we studied the orbits of S-stars around the central SMBH of our Galaxy in the frame of Yukawa gravity using the modified PPN formalism [76][77][78][79]. This research is continuation of our previous investigations of different Extended Gravity theories where we used astronomical data for different astrophysical systems: the S2 star orbit [74,75,[80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96], fundamental plane of elliptical galaxies [97][98][99][100] and barionic Tully-Fischer relation of spiral galaxies [101].…”

Section: Introductionmentioning

confidence: 99%

Formal Education of Asylum Seeker Children in Belgrade, Serbia: Expanded Meaning of Social Inclusion

Jovanović

2019

Social Sciences

View full text Add to dashboard Cite

Formal education of asylum seeker children in Serbia officially started in September 2017, when the consequences of European border regime became more obvious. In spite of the official attitude that Serbia is a transit country, there was a pressure to improve integration policies regarding migration, since a lot of people wanting to seek asylum in European Union have remained in Serbia for months. Educational inclusion is the aspect of asylum seekers’ integration in which the most resources and effort was invested. In this article, I try to define the notions of social and educational inclusion in relation to integration policies of asylum seekers coming from different cultural backgrounds and in relation to existing educational inclusion policies.

show abstract

PPN Motion of S-Stars Around Sgr A*

Cited by 12 publications

References 38 publications

Constraints on Yukawa gravity parameters from observations of bright stars

Constraints on Yukawa gravity parameters from observations of bright stars

Constraints on Graviton Mass from Schwarzschild Precession in the Orbits of S-Stars around the Galactic Center

Formal Education of Asylum Seeker Children in Belgrade, Serbia: Expanded Meaning of Social Inclusion

Contact Info

Product

Resources

About