European Einstein Toolkit Meeting 2024

8 Jul 2024, 08:00 → 12 Jul 2024, 22:00 Europe/Amsterdam

C 1.110 (SciencePark)

We are pleased to announce the 2024 edition of the European Einstein Toolkit Meeting. The in-person workshop will be held at the Gravitation & Astroparticle Physics Amsterdam (https://www.grappa.amsterdam/) center of the University of Amsterdam and will provide an opportunity for researchers and students to learn about the Einstein Toolkit (https://einsteintoolkit.org/), a community-driven software platform of core computational tools to advance and support research in relativistic astrophysics and gravitational physics.

The workshop will offer a mixture of talks and tutorials, with the tutorials including basic tutorials for new users and more advanced topics. The talks will, likewise, provide information for new users and will highlight exciting science cases and the latest developments in numerical relativity. On the final day, we will discuss future directions and development. 

Registration:  Free to attend; Abstract submission and registration deadline is: Jun 20, 2024. In-Person attendance Only.

SOC: Philipp Mösta (chair), Tanja Hinderer, Lionel London, Miguel Zilhao.

LOC: Pablo Bosch, Jiřina Šálková, Anna Aldegheri, Sara Azizi, Sophia Schnauck, Philipp Mösta.

We thank our current sponsors IoP (UvA), API (UvA), Nikhef, LKBF.

By attending the Einstein Toolkit European Meeting 2024 you agree to the GRAPPA code of conduct.

 

Monday, 8 July

1 Registration and arrival

2 Welcome

Speaker: Philipp Moesta (University of Amsterdam)

3 Introduction to Numerical Relativity

Speaker: Peter Diener

talk.pdf

4 Introduction to Hydrodynamics

Speaker: Bruno Giacomazzo

Giacomazzo-Introduction_to_Hydrodynamics.pdf

11:00 Coffee

5 Numerical Methods in General Relativity

Speaker: Isabel Cordero-Carrión

charla isa.pdf

12:30 Lunch

6 Introduction to the Einstein Toolkit 1

Speaker: Steven Brandt

7 Tutorial: Download, compile and run a TOV star

Speakers: Peter Diener, Steve Brandt

16:00 Coffee

8 Tutorial: How to write a thorn for the Einstein Toolkit

Speaker: Max Morris

Tuesday, 9 July

9 Introduction to GRMHD

Speaker: Kenta Kiuchi

Einstein toolkit workshop 2024.pdf

10 Initial Data

Speaker: Philippe Grandclément

slides.pdf

11:00 Coffee

11 Tutorial: Initial Data

Speaker: Philippe Grandclément

grandclement_kadath.pdf

12:30 Lunch

12 Tutorial: CarpetX

Speaker: Erik Schnetter

CarpetX.pdf

13 Tutorial: Generating a thorn with NRPy/Python

Speaker: Steven Brandt

16:00 Coffee

14 Multimessenger Astrophysics

Speaker: Samaya Nissanke

Wednesday, 10 July

15 NSNS/NSBH simulations

Speaker: Sebastiano Bernuzzi

Bernuzzi.pdf

11:00 Coffee

16 Turbulence in neutron-star merger simulations

Speaker: Ian Hawke

Slides

12:30 Lunch

Contributed Presentations

17 Dynamics of fast rotating neutron stars: Time evolution of linear perturbations in full general relativity

We present a code that evolves perturbations of a rapidly rotating compact object in equilibrium in linearised full general relativity in time. We derive the perturbation equations for the spacetime in the Hilbert gauge leading to wave equations, while the hydrodynamical evolution is based on perturbations of the energy-momentum tensor. We use Kreiss-Oliger dissipation in order to achieve a stable time evolution. The code is parallelised using MPI and features favourable scaling with the number of threads. A modified version of the code employs individual grids for spacetime and perfect fluid in order to exploit the CFL criterion allowing for considerably larger time steps. The code features high accuracy at comparably low computational expense and we are able to extract the frequencies of nonaxisymmetric modes of compact objects with rotation rates up to the Kepler limit.

Speaker: Christian Krueger (University of Tuebingen)

ckrueger_etk.pdf

18 Simulating neutron stars under scalar tensor theories with the Einstein Toolkit

We present a numerical implementation of the Einstein equations under scalar tensor theories (STT) based on the Einstein Toolkit framework. We focus on the Jordan frame, where the influence of the scalar fields on the Einstein equations can be expressed through a modified BSSN (Baumgarte-Shapiro-Shibata-Nakamura) formalism while preserving the standard evolution of matter fields. This approach is particularly useful in the study of neutron stars, as it takes advantage of the modularity of the Einstein Toolkit to include more microphysics, allowing to analyze the structure and properties of neutron stars within these extended theories of gravity and identify deviations from general relativity.

Speaker: José Carlos Olvera Meneses (Tübingen University)

15:00 Coffee

19 Discussion: What's most crucial to include in Einstein Toolkit for future?

Thursday, 11 July

Contributed Presentations

20 Gravitational Wave Signals from 3D GRMHD simulations of Core-Collapse Supernovae

With the increasing number of gravitational wave detections by the LIGO-Virgo-KAGRA (LVK) Collaboration, as well as the prospect of the upcoming 3rd generation detectors such as the Einstein Telescope and Cosmic Explorer, we will need to be able to identify the gravitational wave source and extract properties of the source from the detector data. In order to do this effectively, we must develop templates of possible gravitational waves signals emitted from the expected sources. One of the events for which gravitational wave signatures can be detected are Core-collapse supernovae (CCSNe), some of the most energetic explosions in the universe. Gravitational wave observations from CCSNe, would allow us to probe for information from the stellar interior during collapse and the subsequent explosion. Through numerical simulations we can investigate these signatures and among other things gain a better insight into the mechanism driving the explosion. We seek to present results from some of the first production-level GPU based simulations of stellar core-collapse supernovae for a variety of pre-supernova model set-ups using the GPU-accelerated dynamical-spacetime general relativistic magneto-hydrodynamics code GRaM-X, which extends the general relativistic magneto-hydrodynamics (GRMHD) capability of the Einstein Toolkit. We model four CCSNe in 3D, without any symmetry assumptions, varying the rotation rate of the progenitor. Each of the simulations extends for about 100ms post-bounce and the respective gravitational wave signatures are extracted and analyzed for potential detectability with future detectors.

Speaker: Sophia Schnauck (Anton Pannekoek Institute for Astronomy (API))

Einstein Toolkit Meeting.pdf

21 Overlapping gravitational-wave signals

Speaker: Uddipta Bhardwaj

11:00 Coffee

22 Gravitational Waves

Speaker: Maria Haney

Einstein_Toolkit_2024.pdf

12:30 Lunch

23 Gravitational Waves - Detections/Techniques/Parameter Estimation

Speaker: Anuradha Samajdar

samajdar_einstein_toolkit_2024.pdf

15:30 Coffee

24 Discussion

Friday, 12 July

Contributed Presentations

25 SpincsBSSN

Speaker: Peter Diener

10:30 Coffee

26 Discussion/Closeout