Қазақ ұлттық қыздар педагогикалық университеті / Казахский национальный женский педагогический университет

Постоянный URI для этого сообществаhttps://cris.qyzpu.edu.kz/handle/123456789/1

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Gravitational Refraction of Compact Objects with Quadrupoles
(Multidisciplinary Digital Publishing Institute, 2023-02-28)
Nurzada Beissen
;
Daniya Utepova
;
Medeu Abishev
;
Hernando Quevedo
;
Manas Khassanov
We use the material medium approach to derive the refractive index that can be associated with the gravitational field of a compact object with a quadrupole moment. We consider both a static deformation and a stationary rotation of the gravitational source as the source of the quadrupole. We show that up to the first order in the quadrupole, the refractive indices of both configurations are equivalent such that from the point of view of refraction, a mimicking effect can occur. This also holds at the level of the deflection angle. We argue that it is possible to use the refractive indices and the parameters of the trajectories of light rays that propagate in a gravitational field to determine the physical parameters of the source.
Цитирования (OpenAlex) 10Цитирования (OpenCitations) 5
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Application of GBT theorem for Gravitational deflection of light by Compact Objects
(Al-Farabi Kazakh National University, 2023-03-13)
Nurzada Beissen
;
Daniya Utepova
;
Aray Muratkhan
;
Ayazhan Orazymbet
;
Manas Khassanov
One of the most renowned classical experiments that verifies the curved nature of space-time geometry is the bending of light. This phenomenon is extensively discussed in most textbooks on general relativity, with a clear and comprehensive explanation provided. In this study, we employ the material medium approach to determine the refractive index associated with the gravitational field of a compact object with a quadrupole moment. Our research presents a method for calculating the gravitational deflection angle for compact objects by utilizing the refractive index and the GBT theorem for an isotropic metric. This method is particularly important because it allows for the calculation of the deflection angle for both light and relativistic particles. The material medium approach enables us to consider the compact object's gravitational field as a medium with a refractive index. By applying this approach, we establish a relationship between the refractive index and the quadrupole moment of the compact object. We then utilize this relationship to calculate the deflection angle of light and relativistic particles.
Цитирования (OpenAlex) 6Цитирования (OpenCitations) 3
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Comparing the efficiency of GPU and CPU in gravitational lensing simulation
(Al-Farabi Kazakh National University, 2024-06-20)
Nurzada Beissen
;
Daniya Utepova
;
Vladimir N. Kossov
;
Saken Toktarbay
;
Manas Khassanov
In this study, we investigate the computational advancements in simulating gravitational lensing, particularly focusing on the Schwarzschild black hole model. The traditional approach of back ray tracing, where photons are traced back from the observer to the source, is computationally intensive, especially when aiming to achieve high-resolution images of lensing effects around black holes. By employing a numerical method that integrates the Schwarzschild metric with initial conditions derived from the observer's plane, we map the deflection of light around a black hole to generate simulated images of gravitational lensing.The core of our study is the comparison between traditional CPU-based computations and GPU-accelerated processes using the Numba library. Our findings reveal that GPU acceleration, with its parallel processing capabilities, significantly reduces computation time, particularly as the complexity of the simulation increases with larger grid sizes. This computational efficiency is crucial for simulations of gravitational lensing, where the number of independent calculations grows exponentially with the resolution and accuracy of the desired image.Our research underscores the importance of leveraging GPU technology for astrophysical simulations, offering a substantial improvement in performance over CPU-based methods. Keywords: Gravitational Lensing, GPU Parallelization, Schwarzschild Black Hole, Ray Tracing Methods, Numba Library.
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An overview of light ray deflection calculation by magnetars in nonlinear electrodynamics
(2024-06-24)
Nurzada Beissen
;
Medeu Abishev
;
Saken Toktarbay
;
Tursynbek Yernazarov
;
Manas Khassanov
Due to the lack of experimental confirmation of the effects of nonlinear electrodynamics (NED) of vacuum on the electromagnetic wave, it remains the most pressing issue. One of the most optimal media for studying these effects, occurring in astrophysics, are magnetars. Various methods of studying the bending of a wave passing through the magnetospheres of magnetars play a key role in a deeper understanding of vacuum NED. This article reviews modern methods for determining the angle of bending of the electromagnetic wave under the effect of NED of vacuum and gravity, with special attention paid to NED of vacuum in intense electromagnetic fields, which is a characteristic feature of magnetars. The article discusses various methods and techniques used to measure these angles, as well as their potential astrophysical applications.
Цитирования (OpenAlex) 2
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Gravitational capture cross-section in Zipoy-Voorhees spacetimes
(Springer Science+Business Media, 2025-05-28)
S.B. Momynov
;
Kuantay Boshkayev
;
Hernando Quevedo
;
Farida Belissarova
;
A. Dalelkhankyzy
Цитирования (OpenAlex) 5Цитирования (OpenCitations) 4

Қазақ ұлттық қыздар педагогикалық университеті / Казахский национальный женский педагогический университет

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