V. Ivashchuk

activity

19942026

most citedMultidimensional Classical and Quantum Cosmology with Intersecting p-branes

100 citations · 1.8k across the 133 of their papers we have counts for

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69 papers · 1 filter

gr-qc2026

Photon sphere for a dyonic black hole corresponding to $A_{2}$ Toda chain

Vladimir D. Ivashchuk, Evgeny E. Trubach

We consider a dilatonic dyon black hole solution with a gravitational radius of $2 μ$ and two charges, $Q_{1}$ (electric) and $Q_{2}$ (magnetic), within the framework of a four-dimensi…

gr-qc2026

Quasinormal modes in the field of a dyon-like dilatonic black hole corresponding to $A_{1} + A_{1}$ Toda chain

U. S. Kayumov, S. V. Bolokhov, V. D. Ivashchuk +2

We explore the quasinormal modes of a massless test scalar field in the gravitational background of a non-extremal dilatonic dyonic black hole. The dyon-like black hole solution is…

gr-qc2026

Photon Sphere for a Dilatonic Dyonic Black Hole in a Model with an Abelian Gauge Field and a Scalar Field

V. D. Ivashchuk, U. S. Kayumov, A. N. Malybayev +1

Dilatonic dyon black hole solution with gravitational radius $2 μ$ and two charges $Q_{1}$ and $Q_{2}$ (electric and magnetic ones) in the gravitational $4 d$ model with one scalar fiel…

gr-qc2025★ 2 cited

Photon spheres near black holes in a model with anisotropic fluid

V. D. Ivashchuk, S. V. Bolokhov, F. B. Belissarova +4

The semi-review paper studies the null geodesics which appear for black hole solutions in the gravitational $4 d$ model with anisotropic fluid. The equations of state for the fluid…

gr-qc2025

The problem of reconstruction for static spherically-symmetric $4 D$ metrics in scalar-Einstein-Gauss-Bonnet model

K. K. Ernazarov, V. D. Ivashchuk

We consider the $4 D$ gravitational model with a scalar field $φ$ , Einstein and Gauss-Bonnet terms. The action of the model contains a potential term $U (φ)$ , Gauss-Bonnet coupling f…

gr-qc2024

Stability Analysis of Circular Geodesics in Dyonic Dilatonic Black Hole Spacetimes

Kuantay Boshkayev, Gulnaz Takey, Vladimir Ivashchuk +3

This research investigates a non-extreme dyonic-like dilatonic charged black hole solution within a four-dimensional gravity model. This model incorporates two scalar (dilaton) fie…

gr-qc2024

On a reconstruction procedure for special spherically symmetric metrics in the scalar-Einstein-Gauss-Bonnet model: the Schwarzschild metric test

K. K. Ernazarov, V. D. Ivashchuk

The 4D gravitational model with a real scalar field $φ$ , Einstein and Gauss-Bonnet terms is considered. The action contains the potential $U (φ)$ and the Gauss-Bonnet coupling funct…

gr-qc2023★ 13 cited

Circular geodesics in the field of double-charged dilatonic black holes

Kuantay Boshkayev, Gulnara Suliyeva, Vladimir Ivashchuk +1

A non-extreme dilatonic charged (by two ``color electric'' charges) black hole solution is examined within a four-dimensional gravity model that incorporates two scalar (dilaton) f…

gr-qc2023★ 1 cited

Exact $(1 + 3 + 6)$ -dimensional cosmological-type solutions in gravitational model with Yang-Mills field, Gauss-Bonnet term and $Λ$ -term

V. D. Ivashchuk, K. K. Ernazarov, A. A. Kobtsev

We consider $10$ -dimensional gravitational model with $S O (6)$ Yang-Mills field, Gauss-Bonnet term and $Λ$ -term. We study so-called cosmological type solutions defined on product ma…

gr-qc2022

Stable exponential cosmological type solutions with three factor spaces in EGB model with a $Λ$ -term

K. K. Ernazarov, V. D. Ivashchuk

We study a $D$ -dimensional Einstein-Gauss-Bonnet model which includes the Gauss-Bonnet term, the cosmological term $Λ$ and two non-zero constants: $α_{1}$ and $α_{2}$ . Under imposing t…

gr-qc2022★ 11 cited

On quasinormal modes in 4D black hole solutions in the model with anisotropic fluid

S. V. Bolokhov, V. D. Ivashchuk

We consider a family of 4-dimensional black hole solutions from Dehnen et al. ( Grav. Cosmol. 9:153, arXiv: gr-qc/0211049, 2003) governed by natural number $q = 1, 2, 3, \dots$ , wh…

gr-qc2021★ 31 cited

Quasinormal modes in the field of a dyon-like dilatonic black hole

A. N. Malybayev, K. A. Boshkayev, V. D. Ivashchuk

Quasinormal modes of massless test scalar field in the background of gravitational field for a non-extremal dilatonic dyonic black hole are explored. The dyon-like black hole solut…

gr-qc2020★ 1 cited

On stable exponential cosmological solutions with two factor spaces in $(1 + m + 2)$ -dimensional EGB model with $Λ$ -term

V. D. Ivashchuk, A. A. Kobtsev

A $(m + 3)$ -dimensional Einstein-Gauss-Bonnet gravitational model including the Gauss-Bonnet term and the cosmological term $Λ$ is considered. Exact solutions with exponential time…

gr-qc2019★ 5 cited

Stable exponential cosmological solutions with three different Hubble-like parameters in EGB model with a $Λ$ -term

K. K. Ernazarov, V. D. Ivashchuk

We consider a $D$ -dimensional Einstein-Gauss-Bonnet model with a cosmological term $Λ$ and two non-zero constants: $α_{1}$ and $α_{2}$ . We restrict the metrics to be diagonal ones and…

gr-qc2019★ 2 cited

Exponential cosmological solutions with two factor spaces in EGB model with $Λ = 0$ revisited

V. D. Ivashchuk, A. A. Kobtsev

We study exact cosmological solutions in $D$ -dimensional Einstein-Gauss-Bonnet model (with zero cosmological term) governed by two non-zero constants: $α_{1}$ and $α_{2}$ . We deal with…

gr-qc2019★ 7 cited

Examples of stable exponential cosmological solutions with three factor spaces in EGB model with a $Λ$ -term

K. K. Ernazarov, V. D. Ivashchuk

We deal with Einstein-Gauss-Bonnet model in dimension $D$ with a $Λ$ -term. We obtain three stable cosmological solutions with exponential behavior (in time) of three scale factors…

gr-qc2017★ 10 cited

Stable exponential cosmological solutions with two factor spaces in the Einstein-Gauss-Bonnet model with a $Λ$ -term

V. D. Ivashchuk, A. A. Kobtsev

We study $D$ -dimensional Einstein-Gauss-Bonnet gravitational model including the Gauss-Bonnet term and the cosmological term $Λ$ . We find a class of solutions with exponential time…

gr-qc2017★ 16 cited

Stable exponential cosmological solutions with zero variation of $G$ and three different Hubble-like parameters in the Einstein-Gauss-Bonnet model with a $Λ$ -term

K. K. Ernazarov, V. D. Ivashchuk

We consider a $D$ -dimensional gravitational model with a Gauss-Bonnet term and the cosmological term $Λ$ . We restrict the metrics to diagonal cosmological ones and find for certain…

gr-qc2017★ 8 cited

Stable exponential cosmological solutions with zero variation of G in the Einstein-Gauss-Bonnet model with a Lambda-term

K. K. Ernazarov, V. D. Ivashchuk

A D-dimensional gravitational model with a Gauss-Bonnet term and the cosmological term Lambda is considered. By assuming diagonal cosmological metrics, we find, for certain fine-tu…

gr-qc2017★ 22 cited

Dilatonic dyon-like black hole solutions in the model with two Abelian gauge fields

M. E. Abishev, K. A. Boshkayev, V. D. Ivashchuk

Dilatonic black hole dyon-like solutions in the gravitational $4 d$ model with a scalar field, two 2-forms, two dilatonic coupling constants $λ_{i} \neq = 0$ , $i = 1, 2$ , obeying $λ_1 \ne…

gr-qc2016★ 18 cited

On stable exponential solutions in Einstein-Gauss-Bonnet cosmology with zero variation of G

V. D. Ivashchuk

A D-dimensional gravitational model with a Gauss-Bonnet term and the cosmological term Lambda is considered. Assuming diagonal cosmological metrics, we find, for certain non-zero L…

gr-qc2016

On multidimensional solutions in the Einstein-Gauss-Bonnet model with a cosmological term

A. A. Kobtsev, V. D. Ivashchuk, K. K. Ernazarov

A D-dimensional gravitational model with Gauss-Bonnet and cosmological term is considered. When ansatz with diagonal cosmological metrics is adopted, we overview recent solutions f…

gr-qc2015

Dilatonic dyon black hole solutions

M. E. Abishev, K. A. Boshkayev, V. D. Dzhunushaliev +1

Dilatonic black hole dyon solutions with arbitrary dilatonic coupling constant $λ \neq = 0$ and canonical sign $ε = + 1$ for scalar field kynetic term are considered. These s…

gr-qc2015★ 17 cited

On exponential cosmological type solutions in the model with Gauss-Bonnet term and variation of gravitational constant

V. D. Ivashchuk, A. A. Kobtsev

A D-dimensional gravitational model with Gauss-Bonnet term is considered. When ansatz with diagonal cosmological type metrics is adopted, we find solutions with exponential depende…

Photon sphere for a dyonic black hole corresponding to A2​ Toda chain

Quasinormal modes in the field of a dyon-like dilatonic black hole corresponding to A1​+A1​ Toda chain

Photon Sphere for a Dilatonic Dyonic Black Hole in a Model with an Abelian Gauge Field and a Scalar Field

Photon spheres near black holes in a model with anisotropic fluid

The problem of reconstruction for static spherically-symmetric 4D metrics in scalar-Einstein-Gauss-Bonnet model

Stability Analysis of Circular Geodesics in Dyonic Dilatonic Black Hole Spacetimes

On a reconstruction procedure for special spherically symmetric metrics in the scalar-Einstein-Gauss-Bonnet model: the Schwarzschild metric test

Circular geodesics in the field of double-charged dilatonic black holes

Exact (1+3+6)-dimensional cosmological-type solutions in gravitational model with Yang-Mills field, Gauss-Bonnet term and Λ-term

Stable exponential cosmological type solutions with three factor spaces in EGB model with a Λ-term

On quasinormal modes in 4D black hole solutions in the model with anisotropic fluid

Quasinormal modes in the field of a dyon-like dilatonic black hole

On stable exponential cosmological solutions with two factor spaces in (1+m+2)-dimensional EGB model with Λ-term

Stable exponential cosmological solutions with three different Hubble-like parameters in EGB model with a Λ-term

Exponential cosmological solutions with two factor spaces in EGB model with Λ=0 revisited

Examples of stable exponential cosmological solutions with three factor spaces in EGB model with a Λ-term

Stable exponential cosmological solutions with two factor spaces in the Einstein-Gauss-Bonnet model with a Λ-term

Stable exponential cosmological solutions with zero variation of G and three different Hubble-like parameters in the Einstein-Gauss-Bonnet model with a Λ-term

Stable exponential cosmological solutions with zero variation of G in the Einstein-Gauss-Bonnet model with a Lambda-term

Dilatonic dyon-like black hole solutions in the model with two Abelian gauge fields

On stable exponential solutions in Einstein-Gauss-Bonnet cosmology with zero variation of G

On multidimensional solutions in the Einstein-Gauss-Bonnet model with a cosmological term

Dilatonic dyon black hole solutions

On exponential cosmological type solutions in the model with Gauss-Bonnet term and variation of gravitational constant

Photon sphere for a dyonic black hole corresponding to $A_{2}$ Toda chain

Quasinormal modes in the field of a dyon-like dilatonic black hole corresponding to $A_{1} + A_{1}$ Toda chain

The problem of reconstruction for static spherically-symmetric $4 D$ metrics in scalar-Einstein-Gauss-Bonnet model

Exact $(1 + 3 + 6)$ -dimensional cosmological-type solutions in gravitational model with Yang-Mills field, Gauss-Bonnet term and $Λ$ -term

Stable exponential cosmological type solutions with three factor spaces in EGB model with a $Λ$ -term

On stable exponential cosmological solutions with two factor spaces in $(1 + m + 2)$ -dimensional EGB model with $Λ$ -term

Stable exponential cosmological solutions with three different Hubble-like parameters in EGB model with a $Λ$ -term

Exponential cosmological solutions with two factor spaces in EGB model with $Λ = 0$ revisited

Examples of stable exponential cosmological solutions with three factor spaces in EGB model with a $Λ$ -term

Stable exponential cosmological solutions with two factor spaces in the Einstein-Gauss-Bonnet model with a $Λ$ -term

Stable exponential cosmological solutions with zero variation of $G$ and three different Hubble-like parameters in the Einstein-Gauss-Bonnet model with a $Λ$ -term