Modeling the motion of a bright spot in jets from black holes M87* and SgrA*

Dokuchaev, Vyacheslav I.; Nazarova, Natalia O.

doi:10.48550/arxiv.2010.01885

Cited by 4 publications

(3 citation statements)

References 36 publications

(58 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the important theoretical predictions of general relativity (GR) is the possibility of the existence of a mysterious object, namely, black hole. Until now, there are several observations confirming the existence of the black holes in nature [1][2][3][4][5]. The simple black hole solutions are based on the spherical symmetry and static condition.…”

Section: Introductionmentioning

confidence: 98%

Thermodynamics of black string from Rényi entropy in de Rham–Gabadadze–Tolley massive gravity theory

Sriling¹,

Nakarachinda²,

Wongjun³

2022

Class. Quantum Grav.

View full text Add to dashboard Cite

The de Rham-Gabadadze-Tolley (dRGT) black string solution is a cylindrically symmetric and static solution of the Einstein field equation with graviton mass term. For the asymptotically de Sitter (dS) solution, it is possible to obtain the black string with two event horizons corresponding to two thermodynamic systems. The R\'enyi entropy is one of the entropic forms which is suitable to deal with nonextensive properties of the black string. In this work, we investigated the possibility to obtain a stable black string by using the R\'enyi entropy in both separated and effective approaches. We found that the nonextensivity provides the thermodynamically stable black string with moderate size in both approaches. The transition from the hot gas phase to the moderate-sized stable black string in the separated/effective description is a first-order/zeroth-order phase transition. The significant ways to distinguish the black string from both approaches are discussed.

show abstract

Section: Introductionmentioning

confidence: 98%

Thermodynamics of black string from Rényi entropy in de Rham–Gabadadze–Tolley massive gravity theory

Sriling¹,

Nakarachinda²,

Wongjun³

2022

Class. Quantum Grav.

View full text Add to dashboard Cite

show abstract

“…The release of the M87* massive black hole (BH) shadow image by the EHT Collaboration [1,2,3,4] marked a new phase of study of a number of physical effects occurring in the very centers of galactic nuclei. The BH's shadow image is used to constraint both the BH parameters including its spin within General Relativity (GR), as well as the properties of the accretion disk, see [5,6,7] and references therein. The shadow parameters appear to be efficient also in testing for strong-field conditions the parametrized post-Newtonian (PPN) formalism in first order approximation [8].…”

Section: Introductionmentioning

confidence: 99%

Black hole shadow to probe modified gravity

Stepanian,

Khlghatyan,

Gurzadyan

2021

Preprint

View full text Add to dashboard Cite

We study the black hole's shadow for Schwarzschild-de Sitter and Kerr-de Sitter metrics with the contribution of the cosmological constant Λ. Based on the reported parameters of the M87* black hole shadow we obtain constraints for the Λ and show the agreement with the cosmological data. It is shown that, the coupling of the Λ-term with the spin parameter reveals peculiarities for the photon spheres and hence for the shadows. Within the parametrized post-Newtonian formalism the constraint for the corresponding Λ-determined parameter is obtained.

show abstract

“…Recently, by using the advancing techniques in radio interferometry, the first image of a black hole has been detected by The Event Horizon Telescope (EHT) [2]. The information of the image is used to constraint the properties of black holes [3][4][5], and also constraint how the modified gravity theories can be deviated from GR [6]. Moreover, the direct detection of gravitational wave is one of the strong evidences of the existence of black holes recently [7].…”

Section: Introductionmentioning

confidence: 99%

Greybody factor for black holes in dRGT massive gravity

Boonserm¹,

Ngampitipan²,

Wongjun³

2018

Eur. Phys. J. C

View full text Add to dashboard Cite

In general relativity, greybody factor is a quantity related to the quantum nature of a black hole. A high value of greybody factor indicates a high probability that Hawking radiation can reach infinity. Although general relativity is correct and has been successful in describing many phenomena, there are some questions that general relativity cannot answer. Therefore, general relativity is often modified to attain answers. One of the modifications is the 'massive gravity'. The viable model of the massive gravity theory belongs to de Rham, Gabadadze and Tolley (dRGT). In this paper, we calculate the gravitational potential for the de Sitter black hole and for the dRGT black hole. We also derive the rigorous bound on the greybody factor for the de Sitter black hole and the dRGT black hole. It is found that the structure of potentials determines how much the rigorous bound on the greybody factor should be. That is, the higher the potential, the lesser the bound on the greybody factor will be. Moreover, we compare the greybody factor derived from the rigorous bound with the greybody factor derived from the matching technique. The result shows that the rigorous bound is a true lower bound because it is less than the greybody factor obtained from the matching technique.

show abstract

Modeling the motion of a bright spot in jets from black holes M87* and SgrA*

Cited by 4 publications

References 36 publications

Thermodynamics of black string from Rényi entropy in de Rham–Gabadadze–Tolley massive gravity theory

Thermodynamics of black string from Rényi entropy in de Rham–Gabadadze–Tolley massive gravity theory

Black hole shadow to probe modified gravity

Greybody factor for black holes in dRGT massive gravity

Contact Info

Product

Resources

About