2 papers
gr-qc2026
On the catastrophe time of fluids under the action of a gravitational field
D. Astesiano, G. Ortenzi, M. L. Ruggiero
Motivated by the central role of the Zel'dovich approximation in the description of cosmic structure formation through gravitational collapse, we investigate Burgers-type dynamics…
math-ph2025
On Euler equation for incoherent fluid in curved spaces
B. G. Konopelchenko, G. Ortenzi
Hodograph equations for the Euler equation in curved spaces with constant pressure are discussed. It is shown that the use of known results concerning geodesics and associated inte…