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xAct: Efficient tensor computer algebra for MathematicaxAct: Efficient tensor computer algebra for Mathematica
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xAct: Efficient tensor computer algebra for Mathematica | xact.es Reviews
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xAct: Efficient tensor computer algebra for Mathematica
xAct-contrib by xAct-contrib
Community contributions to xAct, a collection of free packages for tensor computer algebra in Mathematica. Leo Stein) and @teake. This is a collection of the community-contributed code for the xAct. Tensor algebra package for Mathematica, which can be downloaded here. The best place to go for questions is the xAct mailing list. You can find our repositories at @xAct-contrib. On github. If you have contributions, feel free to send pull requests. From Thomas Bäckdahl and @barrywardell.
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xAct: xPerm, xTensor, xCoba
http://www.xact.es/prev_news.html
Skip to main content. 27 January 2013: Version 1.0.5 of. Thanks to Teake Nutma and Cyril Pitrou for much help with this release! Is now compatible with. By C Pitrou, X. Roy and O. Umeh, for cosmological perturbation theory around homogeneous spacetimes. Package is now included in the. Improved some basic functionality in the area of induced metrics in. Started new notation for tensors by components in. 5 May 2012: Version 1.0.4 of. Thanks to Thomas Bäckdahl for much help with this release! For alternativ...
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Teake's blog: March 2012
http://teakes.blogspot.com/2012_03_01_archive.html
Your no. 1 resource on all things Teake. Sunday, March 25, 2012. I'm a big fan of xAct. A tensor algebra package for Mathematica. While there are other tensor packages for Mathematica on the market, xAct is by far the best. It canonicalizes tensorial expressions blazingly fast. And its perturbation capabilities. In fact, I like xAct so. Much, I wrote an additional package for. It's aptly called xTras, and its available over on www.xact.es/xtras. First, open up Mathematica, and enter the following line:.
Notes on the pullback connection - Leo C. Stein
https://duetosymmetry.com/notes/notes-on-the-pullback-connection
Postdoctoral researcher, Caltech. Gravitational waves, general relativity and beyond. Notes on the pullback connection. For a Killing vector field. General connection coefficients for. Expansion of pullback connection. In an effort to keep myself organized, I decided I should type up some notes I have laying around. These calculations are not enough to be a journal article (or even a note on the arXiv), but slightly non-trivial, so I don’t want to lose them. This note is on a construction called the.
Notes on the Weyl, E/B, and 3+1 decompositions of Riemann, and curvature invariants - Leo C. Stein
https://duetosymmetry.com/notes/notes-on-the-E-B-and-3+1-decomp-of-Riem
Postdoctoral researcher, Caltech. Gravitational waves, general relativity and beyond. Notes on the Weyl, E/B, and 3 1 decompositions of Riemann, and curvature invariants. 3 1 and electric/magnetic decomposition. Computing from Gauss-Codazzi relations. More notes I had that needed to live somewhere. I hope you find them useful. The most basic ingredient here is splitting the Riemann tensor into trace and tracefree pieces. This should be covered in every standard GR textbook (see e.g. Wald. Signed symmetri...
Links - Leo C. Stein
https://duetosymmetry.com/links
Postdoctoral researcher, Caltech. Gravitational waves, general relativity and beyond. Here is a collection of links you may find useful. If there are some links you think ought to be here, feel free to suggest them to me. Collection of useful conventions, definitions, identities, and formulas. List from Marc Favata. Of gravity conferences and jobs. Physics research conference (PRC) calendar. I am an organizer). Preprints service. I typically read:. My papers on INSPIRE. For xAct (I help maintain). Digita...
barry | barrywardell.net
http://www.barrywardell.net/author/barry
All posts by barry. Gravitational waves from a binary black hole merger. February 12, 2016. Yesterday was an incredibly exciting day for everyone in the gravitational physics community. After months of rumours, the LIGO collaboration. Made the spectacular announcement. It was particularly impressive that the announcement came along with the simultaneous publication of a peer-reviewed paper in Physical Review Letters. And a full release of the data from the detection. Looking further into the future, the ...
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xAct: Efficient tensor computer algebra for Mathematica
Skip to main content. Efficient tensor computer algebra for. José M. Martín-García, GPL 2002-2014. Main collaborators: Alfonso García-Parrado, Alessandro Stecchina, Barry Wardell, Cyril Pitrou, David Brizuela, David Yllanes, Guillaume Faye, Leo Stein, Renato Portugal, Teake Nutma, Thomas Bäckdahl. Is a suite of free packages for tensor computer algebra in. Has been intensively tested and has solved a number of hard problems in. There are four packages acting as a kernel for the rest:. Tex code to format.
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