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188 Publications visible to you, out of a total of 188
Stellar gravitational collapse, singularity formation and theory breakdown

Abstract (Expand)

We review three definitions (missing point(s) unsteadiness, infinite quadratic curvature invariant, and geodesic incompleteness) of what a gravitational singularity is, and argue that prediction of a …a gravitational singularity is problematic for General Relativity (GR), indicating breakdown of Lorentzian geometry, only insofar as it concerns the infinite curvature singularity characterization. In contrast, the geodesic incompleteness characterization is GR’s innovating hallmark, which is not meaningfully available in Newtonian gravity formulations (locally infinite density field, and locally infinite gravitational force) of what a gravitational singularity is. It is the continuous, non-quantized, nature of Lorentzian geometry which admits gravitational contraction be continued indefinitely. The Oppenheimer-Snyder 1939 analytical solution derives formation of a locally infinite curvature singularity and of incomplete geodesics, while Penrose’s 1965 theorem concerns formation of incomplete (null) geodesics only. We critically examine the main physical arguments against gravitational singularity formation in stellar collapse, with scope restriction to decades spanning in between Schwarzschild’s 1916 solution and Penrose’s 1965 singularity theorem. As the most robust curvature singularity formation counter-argument, we assess Markov’s derivation of an upper bound on the quadratic curvature invariant RμνλδRμνλδ≤1ℓP4 from a ratio of natural constants ħ, c and G, in connection with Wheeler’s grounding of the premise that the Planck scale ℓP is ultimate.

Author: Kiril Maltsev

Date Published: 1st Feb 2023

Publication Type: Journal

Modeling Type Ia supernovae with explosions in white dwarfs near and below the Chandrasekhar mass

Abstract (Expand)

The progenitor evolution and the explosion mechanism of Type Ia supernovae remain unexplained. Nonetheless, substantial progress has been made over the past years with three-dimensional hydrodynamic …c simulations of different scenarios. Here, we review some recent work pertaining to the leading paradigms of modeling: thermonuclear explosions of white dwarf stars near and below the Chandrasekhar mass limit. We discuss implications of the different explosion channels and their predictions of observables.

Authors: Friedrich K. Röpke, Florian Lach, Sabrina Gronow, Stuart A. Sim, Fionntan P. Callan, Christine E. Collins

Date Published: 1st Feb 2023

Publication Type: Journal

Family dispute: do Type IIP supernova siblings agree on their distance?

Abstract

Not specified

Authors: Géza Csörnyei, Christian Vogl, Stefan Taubenberger, Andreas Flörs, Stéphane Blondin, Maria Gabriela Cudmani, Alexander Holas, Sabrina Kressierer, Bruno Leibundgut, Wolfgang Hillebrandt

Date Published: 1st Feb 2023

Publication Type: Journal

Hierarchical Bayesian method for constraining the neutron star equation of state with an ensemble of binary neutron star postmerger remnants

Abstract

Not specified

Authors: Alexander W. Criswell, Jesse Miller, Noah Woldemariam, Theodoros Soultanis, Andreas Bauswein, Katerina Chatziioannou, Michael W. Coughlin, Galin Jones, Vuk Mandic

Date Published: 1st Feb 2023

Publication Type: Journal

Double detonations: variations in Type Ia supernovae due to different core and He shell masses - II. Synthetic observables

Abstract

Not specified

Authors: Christine E. Collins, Sabrina Gronow, Stuart A. Sim, Friedrich K. Röpke

Date Published: 1st Dec 2022

Publication Type: Journal

On the fate of the secondary white dwarf in double-degenerate double-detonation Type Ia supernovae

Abstract

Not specified

Authors: R. Pakmor, F. P. Callan, C. E. Collins, S. E. de Mink, A. Holas, W. E. Kerzendorf, M. Kromer, P. G. Neunteufel, John T. O’Brien, F. K. Röpke, A. J. Ruiter, I. R. Seitenzahl, Luke J. Shingles, S. A. Sim, S. Taubenberger

Date Published: 1st Dec 2022

Publication Type: Journal

A finite-volume scheme for modeling compressible magnetohydrodynamic flows at low Mach numbers in stellar interiors

Abstract

Not specified

Authors: G. Leidi, C. Birke, R. Andrassy, J. Higl, P. V. F. Edelmann, G. Wiest, C. Klingenberg, F. K. Röpke

Date Published: 1st Dec 2022

Publication Type: Journal

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