Israel Definition and 9 Threads

A Relativist's Toolkit (2004) lists the Israel junction conditions as: ##1. [h_{ab}]## ##2. S_{ab}=[K_{ab}]-[K]h_{ab}## Where ##S_{ab}## is the stress-energy tensor of the shell only, and ##[K_{ab}]## and ##[K]## are ##K_{ab}^--K_{ab}^+## and ##K^--K^+## respectively. My understanding is that...

Huge daytime fireball over Israel earlier today. (15 Apr 2023) https://www.timesofisrael.com/unusually-bright-meteor-seen-over-israel-as-some-report-hearing-blast/?fbclid=IwAR2mXZmlknAC821IB2syvsdEFt-mTwjUaJri4rDyVJWE3erCPYNK6B_1jW0I have at least one meteorite hunter/collector packing his...

Data has come in from Isreal about the effectiveness of a third dose: https://www.straitstimes.com/world/middle-east/third-pfizer-dose-86-effective-in-over-60s-says-israel-healthcare-provider Remember this is 86% better than those that have already had two doses. I will leave it to others to...

Hello, I am curious as to how one appropriately matches an interior and exterior solution in GR, i.e. where the interior corresponds to the field of some finite spherical mass (perfect fluid sphere, for the Schwarzschild interior solution). Specifically, looking at both the Schwarzschild...

In the next semester (October 2016) I want to start learning physics with preferation for learning in a program that including two subjects- physics and math for the 1st degree. My will it`s to advance to theoretical research and to get a Doctor degree, even co-operate with international...

Is there any book or reference perhaps on string theory or superstring theory or even advanced general relativity that treats the Israel Wilson Perjes metric using the tetrad formalism in details, i.e, 1-forms and so? (Not spinors methos) I have ran across many papers that just place the spin...

I've been learning the Israel formalism (see original article here) for thin shells. I think I understand the formalism well and how to do the matching given two manifolds (that are solutions of the Einstein's field equations - EFE). I've been studying several articles that use the matching...

This woman in Israel is spooked by the clear, brown and green discs just added to transformers in her Israeli townas seen in this clip http://img128.imagevenue.com/img.php?image=82134_ScreenHunter_02Feb.0403.03_122_415lo.jpg She writes: "What are The new installations on the Pylons...

!Artificial rain cloud machine created by Israel scientists! Yesterday, while seeing spanish news, I was seeing are report of Israel scientists created a machine that produces artificial clouds with rain!The machine is a clear tube with an apparatus at the bottom and closed at the top...