Jiří Horák

activity

20162026

α

-viscosity in black hole accretion discs

1 citations · 1 across the 2 of their papers we have counts for

collaborators

3 papers

astro-ph.HE2026★ 1 cited

Universal behaviour of $α$ -viscosity in black hole accretion discs

Marek A. Abramowicz, Axel Brandenburg, Jiří Horák +4

The Shakura-Sunyaev $α$ -viscosity coefficient, defined as the ratio of total stress to total pressure, $α = T / p$ , began to play an important role in the development of accr…

gr-qc2024

Stability of Rotating, Charged Fluids: Generalization of the Hoiland Conditions in Newtonian Non-conductive Case

Kris Schroven, Vladimir Karas, Jiri Horak +2

We study the conditions for stability of electrically charged, non-conductive perfect fluid tori with respect to linear perturbations. To this end we employ Lagrangian perturbation…

math.AP2016

On the geometry of the $p$ -Laplacian operator

Bernd Kawohl, Jiri Horák

The $p$ -Laplacian operator $Δ_{p} u = div (∣\nabla u ∣^{p - 2} \nabla u)$ is not uniformly elliptic for any $p \in (1, 2) \cup (2, \infty)$ and degenerates even more when $p\to \…

Universal behaviour of α-viscosity in black hole accretion discs

Stability of Rotating, Charged Fluids: Generalization of the Hoiland Conditions in Newtonian Non-conductive Case

On the geometry of the p-Laplacian operator

Universal behaviour of $α$ -viscosity in black hole accretion discs

On the geometry of the $p$ -Laplacian operator