Жарияланымдар / Публикации

Постоянный URI для этого сообществаhttps://cris.qyzpu.edu.kz/handle/123456789/2

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2022 - 20255

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Автор: search.filters.author.Hernando QuevedoЯзык: search.filters.language.Английский

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    Gravitational field of slightly deformed naked singularities
    (Springer Science+Business Media, 2022-04-01)
    Saken Toktarbay
    ;
    Hernando Quevedo
    ;
    Medeu Abishev
    ;
    Aray Muratkhan
    Abstract We derive a particular approximate solution of Einstein equations, describing the gravitational field of a mass distribution that slightly deviates from spherical symmetry. The deviation is described by means of a quadrupole parameter that is responsible for the appearance of a curvature singularity, which is not covered by a horizon. We investigate the motion of test particles in the gravitational field of this naked singularity and show that the quadrupole parameter affects the properties of Schwarzschild trajectories. By investigating radial geodesics, we find that no effects of repulsive gravity are present. We interpreted this result as indicating that repulsive gravity is non-linear effect.
    Цитирования (OpenAlex) 12Цитирования (OpenCitations) 9
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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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    Adiabatic theory in Kerr spacetimes
    (Springer Science+Business Media, 2024-05-01)
    Kuantay Boshkayev
    ;
    Gulmira Nurbakyt
    ;
    Hernando Quevedo
    ;
    Gulnara Suliyeva
    ;
    Abylaikhan Tlemissov
    Цитирования (OpenAlex) 3Цитирования (OpenCitations) 3
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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
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    Geometric properties versus particle motion in the Fan-Wang spacetime
    (Elsevier BV, 2025-06-24)
    Gulnara Suliyeva
    ;
    Kuantay Boshkayev
    ;
    Talgar Konysbayev
    ;
    Yergali Kurmanov
    ;
    Orlando Luongo
    Цитирования (OpenAlex) 6Цитирования (OpenCitations) 4