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Einstein Toolkit Meeting Reminder
by Frank Loeffler 25 Apr '16

25 Apr '16

Hi Please consider joining the weekly Einstein Toolkit phone call at 9:30 am US central time on Mondays. As usual, you can find instructions how to join on the following web site: http://einsteintoolkit.org/community/support/ We use a Google hangout, with the URL: https://hangouts.google.com/call/5xt7voshalqmdcztr4zhfeox2ia Frank Löffler

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Build dependency error corrected
by Erik Schnetter 23 Apr '16

23 Apr '16

I just committed several corrections to a benign build dependency error that led to unnecessary rebuilds of many source files whenever a ccl file was modified. Several thorns in ExternalLibraries create a file called "done" to indicate that they are finished configuring their external dependencies, and that other thorns can now build their source files. In several cases, these "done" files were touched (modified) unnecessarily when the external dependencies were unchanged. Via a chain of dependencies, this triggered rebuilds of many source files in many thorns, in particular Fortran source files. -erik -- Erik Schnetter <schnetter(a)gmail.com> http://www.perimeterinstitute.ca/personal/eschnetter/

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Postdoctoral Positions at RIT
by Carlos Lousto 18 Apr '16

18 Apr '16

Hi, Allow me to bring to your attention these postdoctoral positions related to ETK research. Cheers, Carlos Lousto, > > Message to members of the APS Topical Group on Gravitation > Approved by Thomas Baumgarte, GGR Secretary/Treasurer > Postdoctoral Positions at the Rochester Institute of Technology > > The Center for Computational Relativity and Gravitation (CCRG) at the Rochester Institute of Technology (RIT) anticipates filling several postdoctoral positions in the coming year. We are looking for postdoctoral candidates in the areas of modeling of gravitational waves sources and their electromagnetic counterparts with numerical relativity, and gravitational wave data analysis for LIGO and its astrophysical interpretation. > > In the area of computational astrophysics and astrophysical numerical relativity we are particularly interested in candidates who are interested in relativistic magneto-hydrodynamics (GRMHD) simulations of accretion disks around supermassive black hole mergers, and jet dynamics. This work will have direct impact on electromagnetic observations of active galactic nuclei, and is part of an ongoing long-term collaborative research effort with Julian Krolik at Johns Hopkins University, Scott Noble at the University of Tulsa, as well as other collaborators. > > In the area of numerical relativity we are interested in a candidate capable of working on the initial data and evolution of binary black holes and neutron stars in the framework of the Einstein-toolkit (ETK) and LazEv codes. We seek to develop and optimize current RIT's group codes as well as semianalytic efforts to model hybrid waveforms and final remnant formulae for LIGO. The ongoing effort includes several faculty, postdocs, and graduate students, as well as external collaborator Nakano at Kyoto University, and others. > > In the area of gravitational-wave astronomy, we are particularly interested in candidates who are interested in the data analysis challenges involved in the detection of astrophysical gravitational wave sources, including LMXBs and merging compact binaries; in the parameter estimation of binary compact objects, particularly binary black holes; and in the opportunities afforded by multimessenger astrophysics. > > The successful postdoctoral candidates will have the opportunity to collaborate on a broad range of research topics in gravitational physics. Our group is involved in several large collaborations, including the LIGO Scientific Collaboration (LSC), The Einstein Toolkit Consortium, and a Petascale computing project with NCSA. > > There are many senior researchers working in a broad range of areas of gravitational physics and astrophysics at the CCRG. This includes Manuela Campanelli (Director), Joshua Faber, Carlos Lousto, Richard O'Shaughnessy, Jason Nordhaus, Yosef Zlochower, John Whelan, and Hans-Peter Bischof (a visualization expert), several postdoctoral fellows and Ph.D. students (seehttp://ccrg.rit.edu/people for an overview on who is or has been at CCRG). The group also collaborates with many faculty, postdocs and graduate students in the larger astrophysics group , the School of Mathematical Sciences and theSchool of Physics and Astronomy. > > The positions are for two or three years and renewable depending on satisfactory performance and the availability of funds. CCRG researchers have access to several computing cluster facilities at national computing centers such as XSEDE and BlueWaters as well as a dedicated 1600-core cluster hosted at the Center. > > More information about the CCRG and Rochester. > > Applications should consist of a cover letter, a brief statement of research interests, a curriculum vitae including publication list, and at least three letters of recommendation. All materials should be sent electronically as soon as possible to: ccrg-postdoc[AT]ccrgweb.rit.edu For an overview of all job openings at CCRG please go to: http://ccrg.rit.edu/spotlight/jobs. > > Enquiries can be addressed to the center's Director: > > Manuela Campanelli, manuela[AT]astro[dot]rit[dot]edu Center for Computational Relativity and Gravitation, School of Mathematical Sciences, and School of Physics and Astronomy, Rochester Institute of Technology (RIT) 85 Lomb Memorial Drive Rochester, New York 14623 USA > > Review of completed applications will begin as soon as available and will continue until a suitable candidate is found. Starting date can be as early as September, 2016 or in 2017. RIT is committed to equal employment opportunity and affirmative action. > > > APS Headquarters: 1 Physics Ellipse, College Park, MD 20740 > Editorial Office: 1 Research Road, Ridge, NY 11961 > Office of Public Affairs: 529 14th St NW, Ste 1050, Washington, D.C. 20045 > © 2016 American Physical Society | All rights reserved | View Email Online | Forward to a Friend > > You are receiving this message because you are a member of the APS Topical Group on Gravitation. If you no longer wish to receive emails from this unit, you may modify your subscription preferences orunsubscribe from all unit emails.

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meeting minutes for 2016-0-18
by Roland Haas 18 Apr '16

18 Apr '16

Present: Eloisa, Frank, Ian, Matt, Steve, Roland, Peter ET workshop: * all is fine * LSU personel had some problems during registration, Eloisa and Bruno will follow up Tickets marked for release: * Frank and Steve to look into parameter parsing changes * drop changes in https://trac.einsteintoolkit.org/ticket/1837 since exact inversion symmetry is very difficult to maintain in the code Yours, Roland -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://keys.gnupg.net.

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(Late) Einstein Toolkit Meeting Reminder
by Frank Loeffler 18 Apr '16

18 Apr '16

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SimulationTools/h5mma: Unable to communicate with closed link
by Bernard Kelly 12 Apr '16

12 Apr '16

Hi. Today's silly question: I'm trying to use SimulationTools to work with some Carpet HDF5 data. I've loaded SimulationTools & h5mma with no apparent issues, but this line fails: > ToDataRegion[ ImportHDF5[ "<full path to mydata.h5", {"Datasets", "mydataset"}]] ... with the error message: LinkObject::linkd: Unable to communicate with closed link LinkObject['/Users/bjkelly1/Library/Mathematica/Applications/h5mma/MacOSX-x86-64/h5mma',397,6]. >> I can verify that the executable is where that error message says it is, and it's world-runnable. Any ideas why it's not working? thanks Beany P.S. I've never used SimulationTools or h5mma before. I followed the simple installation instructions from http://simulationtools.org/Documentation/English/Tutorials/Introduction.html

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LORENE
by Roland Haas 12 Apr '16

12 Apr '16

Hello Frank, the tarball of LORENE in svn currently contains a known (and fixed) bug, so I would like to update it. Yet, given that you found that LORENE updated its file format a while ago, I was wondering if you knew what the last version before the file format update was so that I could use that one for the tarball. Yours, Roland -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://keys.gnupg.net.

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McLachlan with shift advection but centred stencils
by Roland Haas 11 Apr '16

11 Apr '16

Hello all, just to be sure (I read McLachlan_BSSN.m but want to be sure): it is currently not possible to run a simulation using ML using shift advection beta^i\partial_i but without upwinding the advection derivatives, is it? Such an option is useful for simulations without black holes where one can potentially safe a ghost zone by using only centred stencils. Yours, Roland -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://keys.gnupg.net.

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meeting minutes for 2015-08-31
by Roland Haas 11 Apr '16

11 Apr '16

Present: Frank, Roland, Steve, Peter, Matt, Josh, Erik, Zach, Jonah, Elo There will be no ET call next week due to labour day/Thanksgiving weekend in North America. IllnoisGRMHD: * report is with Zach, was send via private email * separate repo is fine, Zach will create a repository * volunteer needed for the compatibility thorn * Zach will move compatibility thorns into same repo as IllinoisGRMHD GetComponents on OSX: * no OSX user has written * Roland will propose a patch simfactory on BeeGFS: * Erik will look into Bruno's proposed patch writing timeseries data into hdf5: * Frank would like to use this for things like the Hamiltonian norm * HDF5 supports extensible datasets, an example on how to use this is the HDF5 output of Multipole SPH in Cactus: * Matt has a more or less working version of SPH on grid background * came out of work at a national lab on generic grid methods * currently linked in a shared objects for mesh handling and nearest neighbour finding * currently writing his thesis, so code is not changing much right now * load balancing through bisection initially then times the RHS and neighbour looked up push particles around * no octree, instead a hierarchical hash * particle to grid data currently uses SPH approximation for Tmunu at gridpoints of Cactus grid * will arrange for time for presentation through mailing list Yours, Roland -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://keys.gnupg.net.

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Einstein Toolkit Meeting Reminder
by Frank Loeffler 11 Apr '16

11 Apr '16

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