Users

users@lists.einsteintoolkit.org

3 participants
3984 discussions

Agenda for Thursday's Meeting
by rhaas＠illinois.edu 19 Feb '24

19 Feb '24

Please update the Wiki with agenda items for Thursday's meeting. Thanks! https://docs.einsteintoolkit.org/et-docs/meeting_agenda --The Maintainers

1 0

Re: [Users] Parameter file for a binary BH merger immersed in a scalar field
by Roland Haas 16 Feb '24

16 Feb '24

Hello Samuel, Sorry for the long delay in responding. We are experiencing some issues with the mailing list making incoming emails not be correctly forwarded all the time. Thank you for your interest in the toolkit. The thorns in the Canuda repository (ScalarBase, ScalarEvolve, etc.) would indeed seem to be suitable for your application and somewhat similar research is being done in Helvi Witek's research group at UIUC, who is also one of the maintainers and authors of the Canuda code. I believe that e.g. initial data can be produces using eg the TwoPunctures_KerrProca thorn (or a slight modification of it if a scalar rather than a Proca field is required). I have put her and the other maintainers (as listed in the README file) in CC. They may most likely be able to provide more detailed comments (or redirect you to a colleague closer to your timezone that can help). Yours, Roland > Hi! > > My name is Samuel Gómez, physics student doing his master in Uppsala > university, Sweden. Currently I am doing my master thesis with Joshua > Eby from Stockholm University about the phenomenology of > Gravitational Atoms around Neutron Stars and Black Holes. > > I would like to perform numerical simulations for a BH binary merger > around a scalar cloud with EinsteinToolkit. From now, I have been > able to simulate the example of the TOV star given in the > EinteinToolkit official page in my laptop and soon I will gain access > to a computer cluster where I hopefully will be able to install the > Toolkit and perform a simulation for the example of a binary merger. > But my aim is to be able to perform, maybe in its simplest version, a > simulation of a merger around a scalar field, extracting information > about both the evolution of the BHs and the scalar field itself. > > The problem I face is that I am not sure at all if I will be able to > do it without any parameter file. As far as I understood, my current > version of the Toolkit already has installed thorns related with the > implementation of a scalar field (if I am not mistaken, one example > is ScalarBase). I thus send this email asking if it is possible to > obtain a parameter file for simulating this scenario, or to provide > me with any information about an existing tutorial on how to write > one. Something like this would help me a lot. I would appreciate any > answer. > > Thanks! -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://pgp.mit.edu .

3 2

Re: [Users] users@einsteintoolkit.org
by Roland Haas 16 Feb '24

16 Feb '24

1 0

test email 1
by Roland Haas 15 Feb '24

15 Feb '24

Hello all, This is a test of the Einstein Toolkit users mailing list. If this was a real email it would contain some actual text. Yours, Roland

1 0

Meeting minutes 2024-02-15
by Cupp, Samuel D. 15 Feb '24

15 Feb '24

Present: Sam Roland Steve Zach Peter Leo Spec benchmarks We made it to the second stage, so they should combine both and send the check to Steve. Proposed release contributions (and code champions): Multipole (Lucas) NewRadX (Cheng-Hsin) Z4c (Erik) Baikal/BaikalVacuum (Sam) generated from NRPy 2.0 Baikal/BaikalVacuumX (Sam) NRPyPN (Zach)generated from NRPy 2.0 FUKA? GRHayLHD update for tabulated EOS IllinoisGRMHD updated to use GRHayL Compilation on Mac homebrew: Roland has made some progress Might require backports of changes to external libraries Other issues with e.g. FLRWSolver due to difficulties in build system Tickets Issue #2770 fixed in master needs to be backported to previous release Issue #2774 Lots of details, reproducible examples given by Jose Next week's chair - Sam Next week's minute taker - Leo

1 0

Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 14 Feb '24

14 Feb '24

Hello, Please consider joining the weekly Einstein Toolkit phone call at 9:00 am US central time on Thursdays. For details on how to connect and what agenda items are to be discussed, use the link below. https://docs.einsteintoolkit.org/et-docs/Main_Page#Weekly_Users_Call --The Maintainers

1 0

Agenda for Thursday's Meeting
by rhaas＠illinois.edu 12 Feb '24

12 Feb '24

Please update the Wiki with agenda items for Thursday's meeting. Thanks! https://docs.einsteintoolkit.org/et-docs/meeting_agenda --The Maintainers

1 0

typo in GRHydro thorn guide?
by Bruno Giacomazzo 09 Feb '24

09 Feb '24

The GRHydro thorn guide ( https://einsteintoolkit.org/thornguide/EinsteinEvolve/GRHydro/documentation…) contains the following sentence: "However, in the vacuum limit the continuity equations describing the fluid break down. *The speed of sound tends to the speed of light* and everything fails (especially the conversion from conserved to primitive variables)." A student of mine wrote that the sound speed tends to the speed of light if rho tends to zero citing this, but is this correct? For example, taking a polytropic EOS P=k*rho^\gamma, the sound speed squared is (assuming c=1) cs^2= \gamma * k * rho^\gamma / (rho*h) with rho*h=rho+rho*eps+P=rho+\gamma*P/(\gamma-1) So cs^2 goes like rho^\gamma/(rho+\rho^gamma) and if \gamma>1 then cs^2->0 for rho->0 (while it goes to 1 if rho-> infinity). Am I missing something? Cheers, Bruno -- Prof. Bruno Giacomazzo Department of Physics University of Milano-Bicocca Piazza della Scienza 3 20126 Milano Italy email: bruno.giacomazzo(a)unimib.it phone: (+39) 02 6448 2321 web: http://www.brunogiacomazzo.org --------------------------------------------------------------------- There are only 10 types of people in the world: Those who understand binary, and those who don't ----------------------------------------------------------------------

2 1

meeting minutes for 2024-02-08
by Steven Brandt 08 Feb '24

08 Feb '24

- Present: Roland, Steve, Peter, Leo, Sam, Zach - Release: - Still in feature proposal phase - Sam brought up release deadline on the CarpetX call: - LeanBSSN Molx - NewRadX - NPScalarsX - Summer Schools: - June 3-7 US ET Workshop - July 8-12 EU ET Workshop - Unanswered Questions: - Parameter file for BBH collision immersed in a scalar field. Helvi should respond. - Compiling on Frontera: Have to remove certain thorns to compile. We should be pushing the MakeThornList utility. - Compiling on Sciama: Bad compiler? - Our mailing list server seems unable to send out emails, Steve will fix. - We are running out of quota on Github, Roland will fix. - Open Tickets: - Tootle's request for more control of the link line, ordering of arguments. Maybe to use the ?_LIB_DIR to link and not use -L.

1 0

Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 07 Feb '24

07 Feb '24

1 0

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

Users