73 research outputs found
WELLNESS TOURISM – COMPETITIVE BASIS OF EUROPEAN HEALTH TOURISM DESTINATION
Wellness tourism, as global phenomenon of the 21st century, has become an imperative for the successful development of health tourism destinations. Millions of tourists travel to destinations all over the world every day, with one goal - to preserve and improve their mental and physical health. Tourism market is characterised by intensive changes, so the task of the health tourism destinations’ management is to follow those changes vigilantly, in order to be able to adjust their offer to the current trends. In that way, the creation of integral health tourism product is achieved, which will meet the needs of the contemporary customers, who are becoming more demanding and sophisticated. The aim of this paper is to present the importance of wellness tourism in the contemporary offer of health tourism destinations
Distribution of radio spectral index over the Lupus loop
We use all-sky surveys at 408 and 1420 MHz with aim to investigate properties of the Galactic radio source Lupus Loop. We estimate the brightness temperature, surface brightness and radio spectral index of this supernova remnant using the method we have developed. The non-thermal nature of its radiation is confirmed, and also the distribution of spectral index over its area is given
Constraining Scalar-Tensor gravity models by S2 star orbits around the Galactic Center
The aim of our investigation is to derive a particular theory among the class
of scalar-tensor(ST) theories of gravity, and then to test it by studying
kinematics and dynamics of S-stars around supermassive black hole (BH) at
Galactic Center (GC). We also discuss the Newtonian limit of this class of ST
theories of gravity, as well as its parameters. We compare the observed orbit
of S2 star with our simulated orbit which we obtained theoretically with the
derived ST potential and constrained the parameters. Using the obtained best
fit parameters we calculated orbital precession of S2 star in ST gravity,and
found that it has the same direction as in General Relativity (GR), but causes
much larger pericenter shift.Comment: 13 pages, 1 table, 6 figures. Accepted for publication in Facta
Universitatis: Series Phys. Chem. Tech. (Invited lecture at Balkan Workshop
2018
Flux densities and spectral indices of Relaxed Double radio galaxy 3C 84
Here we study the flux densities distribution at 1380, 4908 and 15365 MHz, as well as the radio spectral index of 3C 84, a Double Radio source Associated with Galactic Nucleus (DRAGN). 3C 84 is the dominant giant elliptical galaxy in the Perseus cluster, and thus very interesting for our research. This famous radio galaxy Perseus A has Relaxed Double classification because it has the large halo, with the lack of its compact structure. We show its structure (using 2D and 3D flux density plot). Besides, we calculated the radio spectral index, which we then used to investigate the nature and mechanisms of its radiation. The obtained values of spectral indices indicated that the northern hotspot is dominated by synchrotron radiation, while in southern hotspot there are thermal and non-thermal radiations, depending on the studied frequency pairs.BPU11 : 11th International Conference of the Balkan Physical Union : Proceedings book; Aug 11 - Sep 1, 2022S02-AA Astronomy and Astrophysic
Study of spectral index of giant radio galaxy from Leahy's Atlas: DA 240
Here we investigate the giant radio galaxy DA 240, which is a FR II source. Specifically, we investigate its flux density, as well as the spectral index distribution. For that purpose, we used publicly available data for the source: Leahy's atlas of double radio-sources and NASA/IPAC Extragalactic Database (NED). We used observations at 326 MHz (92 cm) and at 608 MHz (49 cm) and obtained spectral index distributions between 326 and 608 MHz. For the first time we give spectral index map for these frequencies. We found that the synchrotron radiation is the dominant radiation mechanism over most of the area of DA 240, and also investigated the mechanism of radiation at some characteristic points, namely its core and the hotspots. The results of this study will be helpful for understanding the evolutionary process of the DA 240 radio source
Constraints on f(R, ɸ) (Sanders-Like) Gravity Potential From Orbit of S2 Star
We investigate the possibility to explain theoretically the S2 star orbital precession around the massive object at Galactic Centre using Extended Theories of Gravity, specifically f(R, φ) a Sanders-like gravitational potential in total absence of dark matter. To this aim an analytic fourth-order theory of gravity, non-minimally coupled with a massive scalar field is considered. The interaction term is given by an analytic functions f(R, φ) where R is the Ricci scalar and φ is the scalar field. We simulated orbit of S2 star around Galactic Centre in Sanders-like gravity potentials and compared it with NTT/VLT observations. We presented maps of reduced χ 2 over the {α − mφ} parameter space in the case of NTT/VLT observations. The approach we are proposing seems reliable to constrain modified gravity models at astronomical level
Constraints on f(R, ɸ) (Sanders-Like) Gravity Potential From Orbit of S2 Star
We investigate the possibility to explain theoretically the S2 star orbital precession around the massive object at the Galactic Centre using Extended Theories of Gravity [1], specifically f(R, φ) a Sanders-like [2] gravitational potential in total absence of dark matter. To this aim an analytic fourth-order theory of gravity, non-minimally coupled with a massive scalar field is considered. The interaction term is given by an analytic functions f(R, φ) where R is the Ricci scalar and φ is the scalar field. We simulated orbit of S2 star around the Galactic Centre in Sanders-like gravity potentials and compared it with NTT/VLT observations. We presented maps of reduced χ 2 over the {α−mφ} parameter space in the case of NTT/VLT observations. The approach we are proposing [3,4] seems reliable to constrain modified gravity models at astronomical level.17th National Conference of Astronomers of Serbia : Book of abstracts; September 23-27,2014, Belgrad
Distribution of radio spectral index over the Lupus loop
We use all-sky surveys at 408 and 1420 MHz with aim to investigate properties of the Galactic radio source Lupus Loop. We estimate the brightness temperature, surface brightness and radio spectral index of this supernova remnant using the method we have developed. The non-thermal nature of its radiation is confirmed, and also the distribution of spectral index over its area is given.17th National Conference of Astronomers of Serbia : Book of abstracts; September 23-27,2014, Belgrad
Improvement of graviton mass constraints using GRAVITY's detection of Schwarzschild precession in the orbit of S2 star around the Galactic Center
Here we study the possible improvements of the existing constraints on the
upper bound of graviton mass by the analysis of the stellar orbits around the
supermassive black hole (SMBH) at the Galactic Center (GC) in the framework of
Yukawa gravity. Main motivation for this study is recent detection of
Schwarzschild precession in the orbit of S2 star around the SMBH at the GC by
the GRAVITY Collaboration in 2020. They indicated that the orbital precession
of the S2 star is close to the General Relativity (GR) prediction, but with
possible small deviation from it, and parametrized this effect by introducing
an ad hoc factor in the parameterized post-Newtonian (PPN) equations of motion.
Here we use the value of this factor presented by GRAVITY in order to perform
two-body simulations of the stellar orbits in massive gravity using equations
of motion in the modified PPN formalism, as well as to constrain the range of
massive interaction . From the obtained values of , and
assuming that it corresponds to the Compton wavelength of graviton, we then
calculated new estimates for the upper bound of graviton mass which are found
to be independent, but consistent with the LIGO's estimate of graviton mass
from the first gravitational wave (GW) signal GW150914. We also performed
Markov chain Monte Carlo (MCMC) simulations in order to constrain the bounds on
graviton mass in the case of a small deviation of the stellar orbits from the
corresponding GR predictions and showed that our method could further improve
previous estimates for upper bounds on the graviton mass. It is also
demonstrated that such analysis of the observed orbits of S-stars around the GC
in the frame of the Yukawa gravity represents a tool for constraining the upper
bound for the graviton mass, as well as for probing the predictions of GR or
other gravity theories.Comment: 13 pages, 2 tables, 6 figure
Constraints on Graviton Mass from Schwarzschild Precession in the Orbits of S-Stars around the Galactic Center
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 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
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