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- M. Akmullah Bashkir State Pedagogical UniversityRU18 papers
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- Ufa Institute of ChemistryRU7 papers
- Centre National de la Recherche ScientifiqueFR6 papers
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8 papers · 1 filter
Classification of five-point differential-difference equations
R. N. Garifullin, R. I. Yamilov, D. Levi
Using the generalized symmetry method, we carry out, up to autonomous point transformations, the classification of integrable equations of a subclass of the autonomous five-point d…
Mass decomposition of SLACS lens galaxies in Weyl conformal gravity
Alexander A. Potapov, Ramil N. Izmailov, Kamal K. Nandi
We study here, using the Mannheim-Kazanas solution of Weyl conformal theory, the mass decomposition in the representative subsample of early-type elliptical lens galaxies of t…
Revisiting perfect fluid dark matter: Observational constraints from our galaxy
Alexander A. Potapov, Guzel M. Garipova, Kamal K. Nandi
We revisit certain features of an assumed spherically symmetric perfect fluid dark matter halo in the light of the observed data of our galaxy
Note on the Schwarzschild-phantom wormhole
Regina Lukmanova, Alina Khaibullina, Ramil Izmailov +3
Recently, it has been shown by Lobo, Parsaei and Riazi (LPR) that phantom energy with could support phantom wormholes. Several classes of such solutions have been de…
Stability and instability of Ellis and phantom wormholes: Are there ghosts?
Kamal K. Nandi, Alexander A. Potapov, Ramil Izmailov +2
It is concluded in the literature that Ellis wormhole is unstable under small perturbations and would decay either to the Schwarzschild black hole or expand away to infinity. While…
Non-invertible transformations for the classification of differential-difference equations
R. N. Garifullin, R. I. Yamilov, D. Levi
We discuss aspects of the theory of non-invertible transformations which enter in the problem of classification of diffe\-ren\-tial-difference equations and, in particular, the not…