R
Roger Käppeli
Researcher at ETH Zurich
Publications - 38
Citations - 2382
Roger Käppeli is an academic researcher from ETH Zurich. The author has contributed to research in topics: Finite volume method & Euler equations. The author has an hindex of 17, co-authored 36 publications receiving 2035 citations. Previous affiliations of Roger Käppeli include University of Basel.
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Journal ArticleDOI
MAGNETOROTATIONALLY DRIVEN SUPERNOVAE AS THE ORIGIN OF EARLY GALAXY r-PROCESS ELEMENTS?
C. Winteler,Roger Käppeli,Albino Perego,Almudena Arcones,Nicolas Vasset,Nobuya Nishimura,Matthias Liebendörfer,Friedrich-Karl Thielemann +7 more
TL;DR: In this paper, the authors examined magnetorotationally driven supernovae as sources of r-process elements in the early Galaxy and found that the peak distribution of Ye in the ejecta is shifted from 0.15 to 0.17 and broadened toward higher Ye due to neutrino absorption.
Journal ArticleDOI
Neutrino-driven winds from neutron star merger remnants
Albino Perego,Albino Perego,Stephan Rosswog,Rubén M. Cabezón,Oleg Korobkin,Roger Käppeli,Almudena Arcones,Matthias Liebendörfer +7 more
TL;DR: In this article, a detailed, three-dimensional hydrodynamic study of the neutrino-driven winds that emerge from the remnant of a neutron star merger is presented, and a lower limit on the expelled mass of 3:5 10 3 M, large enough to be relevant for heavy element nucleosynthesis is derived.
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What are the astrophysical sites for the r-process and the production of heavy elements?
Friedrich-Karl Thielemann,Almudena Arcones,Roger Käppeli,Matthias Liebendörfer,Thomas Rauscher,C. Winteler,Carla Fröhlich,Iris Dillmann,Tobias Fischer,Gabriel Martínez-Pinedo,K. Langanke,K. Farouqi,K.-L. Kratz,I. V. Panov,I. Korneev +14 more
TL;DR: In this paper, three of the four nucleosynthesis processes involved in producing heavy nuclei beyond Fe (with a main focus on the r -process) are identified with explosive Ne/O-burning in outer zones of the progenitor star.
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Core-collapse supernova explosions triggered by a quark-hadron phase transition during the early post-bounce phase
Tobias Fischer,Tobias Fischer,Irina Sagert,Giuseppe Pagliara,Matthias Hempel,Jürgen Schaffner-Bielich,Thomas Rauscher,Friedrich-Karl Thielemann,Roger Käppeli,Gabriel Martínez-Pinedo,Matthias Liebendörfer +10 more
TL;DR: In this article, a quark-hadron hybrid equation of state was constructed for core-collapse supernova simulations, based on general relativistic radiation hydrodynamics and three-flavor Boltzmann neutrino transport in spherical symmetry.
Journal ArticleDOI
Well-balanced schemes for the Euler equations with gravitation
Roger Käppeli,Siddhartha Mishra +1 more
TL;DR: In this article, the authors proposed a well-balanced high-order finite volume scheme to approximate the Euler equations with gravitation, which preserves discrete equilibria, corresponding to a large class of physically stable hydrostatic steady states.