| 27 Apr 2023 |
|  drewmcgee joined the room. | 19:36:31 |
| drewmcgee | Hello! I am attempting to recreate the gravitational deflection of a photon in Schwarzschild spacetime using EinsteinPy. I'm running into some trouble with the momentum variable. Does anyone know what I should specify the array as to set up a photon properly? | 19:40:36 |
| 9 May 2023 |
|  diamondtoken set a profile picture. | 15:13:38 |
| 5 Jul 2023 |
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| 8 Jul 2023 |
|  phill630 joined the room. | 06:00:20 |
| phill630 | I looked at the first example with hypersurface. So then really what I would like to start to look at is the deformation of a rectangular hyperplane through a spherical mass at different points of cross section. Seems to be a lot more to it than the texts I have describe it. OK there is a christoff. So then in terms of a hyperplane there nodes with 2d coordinated and there should be a displacement. In fem this displacement is commonly referred to as u. Is there a way to get the displacements for a 2d hyperplane described? I'm hoping to find a computer way to show me the math so I can better understand it. All of the texts I read seem to obfuscate so much of what is meant, | 06:06:33 |
| 14 Jul 2023 |
 JeS24 | What you are looking for are "foliations" - stacks of hypersurfaces. DiscreteHypersurfaceDecomposition is a good way to explore it in code, provided you have access to Mathematica. | 09:17:43 |
| 3 Aug 2023 |
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| 27 Aug 2023 |
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| 5 Sep 2023 |
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| 7 Oct 2023 |
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| 7 Dec 2023 |
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| 6 Jan 2024 |
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| 10 Jan 2024 |
| Ivan Markin changed their display name from unkaktus to Ivan Markin. | 10:58:25 |
| 17 Jan 2024 |
|  Aidan Johnson joined the room. | 12:37:45 |
| Aidan Johnson | Hey everybody, I'm a Masters student currently trying to use EPy to make calculations in perturbed space time, i.e. making perturbations to the metric and then calculating the new Ricci Tensor, etc. I'm wondering is there a way in EPy to discard second-order and higher terms? (i.e. ones where I have my perturbations squared and higher) I'm currently getting a lot more terms in my calculations than I need. Many thanks! | 12:43:10 |
| 18 Jan 2024 |
| JeS24 | Hi Aidan Johnson. This is an interesting question. I presume, you are using einsteinpy.symbolic for your calculations ?! If so, it uses SymPy internally. So, denoting higher order terms with a $\mathcal{O}$ (Big-O) should allow tricks like the ones mentioned here - https://stackoverflow.com/a/25108370. Can you try it and let me know if it works in your case? | 13:50:28 |
| JeS24 | Note that removeO() is defined for Expr - https://docs.sympy.org/latest/modules/core.html#sympy.core.expr.Expr.removeO. So, try converting the individual tensor elements to Expr prior to the approximation. | 13:51:53 |
| 12 Feb 2024 |
|  Smit Sekhadia joined the room. | 07:34:21 |
| Smit Sekhadia | Hello,
I am Smit Sekhadia and am new to EPy! I am a Final year Undergraduate Student pursuing Information Technology at VJTI, Mumbai.
General Relativity has always fascinated me since early days of my schooling!
I have been an active Open Source contributor and am looking forward to contribute to EPy for GSoC 2024 as well!
Any guidance for contributions / connecting with contributors will be appreciated.
Thankyou! | 07:37:44 |
| JeS24 | Hi. EPy is unfortunately not participating in this year's GSoC, due to unavailability of mentors. I recommend checking https://openastronomy.org/gsoc/gsoc2024/ for projects from related libraries, such as SunPy and AstroPy. | 09:37:40 |
| Smit Sekhadia | Ok , Thankyou! | 10:52:11 |
| Smit Sekhadia | I would still like to know about EPy, will read the docs!😄 | 10:53:16 |
| JeS24 | Sure, please consult https://docs.einsteinpy.org/en/latest/ [Latest. not stable] for the current docs. There are also beginner-friendly open issues that you can find on the EPy GitHub repo. | 10:54:27 |
| 13 Feb 2024 |
|  Steven R Brandt joined the room. | 14:01:09 |
| Steven R Brandt | Hey, I just clicked on "Tutorials" on https://einsteinpy.org and got a 404. Can someone please fix that? Thanks. | 14:01:52 |
| 14 Feb 2024 |
| JeS24 | In reply to @stevenrbrandt:matrix.org
Hey, I just clicked on "Tutorials" on https://einsteinpy.org and got a 404. Can someone please fix that? Thanks. Try this link: https://mybinder.org/v2/gh/einsteinpy/einsteinpy/main?filepath=docs/source/examples/index.ipynb. Will update the site in some time. Also, note that the corresponding documentation is available here: https://docs.einsteinpy.org/en/latest/ (latest, and not stable). | 02:07:34 |
| JeS24 | Site's updated. | 02:12:26 |
| 18 Mar 2024 |
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