Zobrazeno 1 - 10
of 2 297
pro vyhledávání: '"A. Dokuchaev"'
Autor:
Dokuchaev, Nikolai
The paper establishes an analog Whittaker-Shannon-Kotelnikov sampling theorem with fast decreasing coefficient, as well as a new modification of the corresponding interpolation formula applicable for general type non-vanishing bounded continuous sign
Externí odkaz:
http://arxiv.org/abs/2405.10007
Autor:
Dokuchaev, Nikolai
The paper establishes frequency predictability criteria and presents predictors for two-sided non-vanishing bounded continuous time signals, i.e., for signals from $L_{\infty}(\R)$ that do not necessarily vanish at $\pm\infty$. The notions of transfe
Externí odkaz:
http://arxiv.org/abs/2405.05566
Short review of the Weyl geometry is given. To describe the phenomenological particle creation we suggest the modified perfect fluid model taking into account the back reaction on the geometry of both the already created particles and the very proces
Externí odkaz:
http://arxiv.org/abs/2401.06235
Publikováno v:
Gravitation and Cosmology, 2024, Vol. 30, No. 3, pp. 246-253
We describe the possible forms of black hole images, viewed by a distant observer. These images are numerically calculated basing on general relativity and equations of motion in the Kerr-Newman metric. Black hole image is a gravitationally lensed im
Externí odkaz:
http://arxiv.org/abs/2401.01694
We describe quantum correction to the accreting hot plasma onto black holes. This quantum correction is related with the Hawking radiation, which heats the accreting plasma. The hot accreting gas is heated additionally by the quantum Hawking radiatio
Externí odkaz:
http://arxiv.org/abs/2312.16849
Publikováno v:
Zh.Exp.Teor.Fiz. Vol. 165, 800-806 (2024)
We generalize the notion of Einstein-Rosen bridge by defining it as a space-like connection between two universes with regions of asymptotically minkowskian space-time infinities. The corresponding symmetry and asymmetry properties of the generalized
Externí odkaz:
http://arxiv.org/abs/2312.15870
Autor:
Dokuchaev, Nikolai
The paper studies spectral representation as well as predictability and recoverability problems for non-vanishing discrete time signals from $\ell_\infty$, i.e. for bounded discrete time signals, including signals that do not vanish at $\pm\infty$. T
Externí odkaz:
http://arxiv.org/abs/2310.10316
Publikováno v:
Astronomy 2, no. 3: 141-152 (2023)
We reconstructed dark spots in the images of supermassive black holes SgrA* and M87* provided by the Event Horizon Telescope (EHT) collaboration by using the geometrically thin accretion disk model. In this model, the black hole is highlighted by the
Externí odkaz:
http://arxiv.org/abs/2307.14714
Autor:
Dokuchaev, Nikolai
Publikováno v:
Problems of Information Transmission (2023) v. 59, iss 2, pp. 99--114
The paper presents linear predictors and causal filters for discrete time signals featuring some different kinds of spectrum degeneracy. These predictors and filters are based on approximation of ideal non-causal transfer functions by causal transfer
Externí odkaz:
http://arxiv.org/abs/2302.14255
These are lectures for students at the summer school conducted by the Faculty of Fundamental Sciences, Bauman Moscow State Technical University at 2022.
Comment: 20 pages
Comment: 20 pages
Externí odkaz:
http://arxiv.org/abs/2208.04906