P. Jovanović
A5053112089- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Stellar, planetary, and galactic studies
- Relativity and Gravitational Theory
- Astrophysics and Cosmic Phenomena
- Glaucoma and retinal disorders
- Astronomy and Astrophysical Research
- Mechanics and Biomechanics Studies
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Retinal Diseases and Treatments
- Computational Physics and Python Applications
- Radiation Effects in Electronics
- Particle Accelerators and Free-Electron Lasers
University of Nis
2008-2025
Astronomical Observatory
2015-2024
University of Belgrade
2010-2023
Vinča Institute of Nuclear Sciences
2023
Institute of General and Physical Chemistry
2023
University of Birmingham
2004-2020
Klinički centar Niš
2003-2020
University of Southampton
2018
Ophthalmology Clinic
2010-2017
University Medical Center
2014-2016
Here we study possible improvements of the existing constraints on upper bound graviton mass by analysis stellar orbits around supermassive black hole (SMBH) at Galactic Center (GC) in framework Yukawa gravity. A motivation for this is a recent detection Schwarzschild precession orbit S2 star SMBH GC GRAVITY Collaboration. The authors indicated that orbital close to general relativity (GR) prediction, but with small deviation from it, and parametrized effect introducing an ad hoc factor...
Results are presented on hyperon and antihyperon production in Pb–Pb, pPb pBe collisions at 158 GeV/c per nucleon. Λ, Ξ Ω yields have been measured central rapidity medium transverse momentum as functions of the centrality collision. Comparing Pb–Pb to those interactions, strangeness enhancement is observed. The increases with content hyperons, reaching a factor about 20 for collisions.
One of the most intriguing scenarios proposed to explain how active galactic nuclei are triggered involves existence a supermassive binary black hole (BH) system in their cores. Here, we present an observational evidence for first spectroscopically resolved sub-parsec orbit such core Seyfert galaxy NGC 4151. Using method similar those typically used spectroscopic stars, obtained radial velocity curves system, from which calculated orbital elements and made estimates about masses components....
Lactate dehydrogenase (LDH) and lactate are some of the hypoxy biochemical parameters. Extracellular activity this enzyme increases under condition oxidative stress, since cell integrity can be disrupted during lipid peroxidation process. Subsequently that leads to increase level lactic acid salts. The objective investigation is establishing LDH, LDH1 (HBDH) concentration in aqueous humour patients with primary open-angle glaucoma.Biochemical analysis have been made by enzymatic-colometric...
We consider possible signatures for Yukawa gravity within the Galactic Central Parsec, based on our analysis of S2 star orbital precession around massive compact dark object at Centre, and comparisons between simulated orbits in two independent sets observations. Our simulations resulted strong constraints range interaction $\Lambda$ showed that its most probable value case is 5000 - 7000 AU. At same time, we were not able to obtain reliable constrains universal constant $\delta$ gravity,...
Recently LIGO collaboration discovered gravitational waves [1] predicted 100 years ago by A. Einstein. Moreover, in the key paper reporting about discovery, joint & VIRGO team presented an upper limit on graviton mass such as mg < 1.2 × 10−22 eV [2] (see also more details another [3] dedicated to a data analysis obtain small constraint mass). Since is so authors concluded that their observational do not show violations of classical general relativity. We consider opportunity evaluate from...
In this paper we investigate a Yukawa gravity modification of the Newtonian gravitational potential in weak field approximation. For that purpose derived corresponding equations motion and used them to perform two-body simulations stellar orbits. 2020 GRAVITY Collaboration detected orbital precession S2 star around supermassive black hole (SMBH) at Galactic Center (GC) showed it is close general relativity (GR) prediction. Using observational fact, evaluated parameters (the range interaction...
We study some possible observational signatures of $R^n$ gravity at Galactic scales and how these could be used for constraining this type $f(R)$ gravity. For that purpose, we performed two-body simulations in potential analyzed the obtained trajectories S2-like stars around center, as well resulting parameter space potential. Here, discuss constraints on which can from observations orbits with present next generations large telescopes. make comparison between theoretical results...
We present an analysis of 43 years (1972 to 2015) spectroscopic observations the Seyfert 1 galaxy NGC 5548. This includes 12 new unpublished (2003 2015). compiled about 1600 H$\beta$ spectra and analyzed long-term spectral variations 5100 \AA\ continuum line. Our is based on standard procedures including Lomb-Scargle method, which known be rather limited such heterogeneous data sets, method developed specifically for this project that more robust reveals a $\sim$5700 day periodicity in light...
A measurement of strange baryon and antibaryon production in Pb-Pb collisions has been carried out by the NA57 experiment at CERN SPS, with 40 158 GeV/c beam momentum. Results on $Λ$, $Ξ$ $Ω$ hyperon yields mid-rapidity most central 53% are presented compared those obtained higher energy, same collision centrality range. The $Λ$ $Ξ^-$ per unit rapidity stay roughly constant while $Ω^-$, $\barΛ$, $\barΞ^+$ $\barΩ^+$ increase when going to SPS energy. Hyperon from STAR $\sqrt{s_{NN}}$ = 130...
Hadronic event shape distributions from e+e− annihilation measured by the OPAL experiment at centre-of-mass energies between 91 GeV and 209 are used to determine strong coupling α S. The results based on QCD predictions complete next-to-next-to-leading order (NNLO), NNLO calculations matched resummed next-to-leading-log-approximation terms (NNLO + NLLA). combined result all variables is while NLLA completeness of with respect missing higher contributions, studied varying renormalization...
We investigate the possibility of explaining theoretically observed deviations S2 star orbit around Galactic Centre using gravitational potentials derived from modified gravity models in absence dark matter. To this aim, an analytic fourth-order theory gravity, nonminimally coupled with a massive scalar field, is considered. Specifically, interaction term given by functions $f(R)$ and $f(R,\ensuremath{\phi})$ where $R$ Ricci $\ensuremath{\phi}$ field whose meaning can be related to further...
Nonlocal theories of gravity have recently drawn a lot attention because they can suitably represent the behavior gravitational interaction in ultraviolet regime. Furthermore, at infrared scales, give rise to notable cosmological effects which could be important describe dark energy behavior. In particular, exponential forms distortion function seem particularly useful for this purpose. Using Noether symmetries, it shown that only nontrivial form is one, working not minisuperspaces, but also...
After giving a short overview of previous results on constraining Extended Gravity by stellar orbits, we discuss the Schwarzschild orbital precession S2 star assuming congruence with predictions General Relativity (GR). At moment, trajectory is remarkably fitted first post-Newtonian approximation GR. In particular, both Keck and VLT (GRAVITY) teams declared that gravitational redshift near its pericenter passage for orbit corresponds to theoretical estimates found (pN) approximation. 2020,...
In this paper we use a modification of the Newtonian gravitational potential with non-linear Yukawa-like correction, as it was proposed by C. Will earlier to obtain new bounds on graviton mass from observed orbits S-stars around Galactic Center (GC). This phenomenological differs obtained in weak field limit Yukawa gravity, which used our previous studies. We also assumed that orbital precession is close prediction General Relativity (GR) for Schwarzschild precession, but possible small...