3 papers
physics.pop-ph2024
Black holes, Achilles and the original tortoise coordinate
Markus Pössel
The "frozen star" picture of black holes, based on the fact that an outside observer will never see a collapsing sphere shrink sufficiently to form a black hole horizon, was a hist…
astro-ph.GA2019
Scalar field effects on the orbit of S2 star
António Amorim, Michael Bauböck, Myriam Benisty +35
Precise measurements of the S-stars orbiting SgrA* have set strong constraints on the nature of the compact object at the centre of the Milky Way. The presence of a black hole in t…
gr-qc2018
Teaching cosmology with special relativity: Piecewise inertial frames as a model for cosmic expansion
Markus Pössel
This article presents a simple model that reproduces key concepts of modern cosmology within the framework of special relativity, at a level that is suitable for an undergraduate o…