Concept
Congruence (general relativity)
Related publications (11)
A generalization of the Hawking black hole area theorem
Hawking's black hole area theorem was proven using the null energy condition (NEC), a pointwise condition violated by quantum fields. The violation of the NEC is usually cited as the reason that black hole evaporation is allowed in the context of semiclass ...
Springer/Plenum Publishers2024Estimating the non-dimensional energy of vortex rings by modelling their roll-up
The non-dimensional energy of starting vortex rings typically converges to values around 0.33 when they are created by a piston-cylinder or a bluff body translating at a constant speed. To explore the limits of the universality of this value and to analyse ...
2022Turbulence and flows in the plasma boundary of snowflake magnetic configurations
Paolo Ricci, Louis Nicolas Stenger, Maurizio Giacomin
The power exhaust through the scrape-off layer (SOL) in fusion reactors is expected to be significantly higher than in ITER, thus questioning the extrapolation of the ITER exhaust solution to these devices. The snowflake (SF) magnetic configuration is one ...
2020MATHICSE Technical Report : A model order reduction framework for parametrized nonlinear PDE constrained optimization
In this paper, we propose a model order reduction framework for parametrized quadratic optimization problems constrained by nonlinear stationary PDEs. Once the solutions of the optimization problem are characterized as the solutions of the corresponding op ...
MATHICSE2015Spinning AdS propagators
We develop the embedding formalism to describe symmetric traceless tensors in Anti-de Sitter space. We use this formalism to construct the bulk-to-bulk propagator of massive spin J fields and check that it has the expected short distance and massless limit ...
Springer2014Transport studies in the snowflake divertor in TCV
Basil Duval, Stefano Coda, Holger Reimerdes, Benoît Labit, Wouter Vijvers, Francesco Piras
The transport of heat and particles in a tokamak plasma with a snowflake divertor has been studied in recent TCV experiments. Estimates of the power flux onto the divertor plates are obtained from measurements with multiple infrared cameras and Langmuir pr ...
2011"Snowflake" H Mode in a Tokamak Plasma
Olivier Sauter, Basil Duval, Stefano Coda, Jean-Marc Moret, Benoît Labit, Francesco Piras, János Márki, Andreas Pitzschke
An edge-localized mode (ELM) H-mode regime, supported by electron cyclotron heating, has been successfully established in a snowflake (second-order null) divertor configuration for the first time in the TCV tokamak. This regime exhibits 2 to 3 times lowe ...
The American Physical Society2010Discontinuous Galerkin method for computing gravitational waveforms from extreme mass ratio binaries
Gravitational wave emission from extreme mass ratio binaries (EMRBs) should be detectable by the joint NASA-ESA LISA project, spurring interest in analytical and numerical methods for investigating EMRBs. We describe a discontinuous Galerkin (dG) method fo ...
IOP PUBLISHING LTD2009High frequency electron spin resonance study of peapods
László Forró, Luka Ciric, Bálint Náfrádi
We present high frequency Electron Spin Resonance (ESR) results on a peapod sample. In a previous low frequency ESR study on peapods and double-walled nanotubes the observation of a non-Lorentzian line shape was reported. This effect was tentatively attrib ...
2008