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### 39 Likes

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1. Jilan liked post by btr On thread : The God's eye global gist of general relativity
On this cave business... If you have a ball of uniform density and radius R_1, and create a ball-shaped cavity within it (anywhere within it) with radius R_2 < R_1, then in Newtonian gravity the...
Liked On: 06-29-2014, 03:52 PM
2. Jilan liked post by btr On thread : Turning light into matter
In the words of Sheldon Cooper, "this is a classic example of Münchhausen's Trilemma: either the reason is predicated on a series of sub-reasons, leading to an infinite regression; or it tracks back...
Liked On: 06-26-2014, 05:27 AM
3. Beer w/Straw liked post by btr On thread : Non-inertial clock orbiting an inertial clock: "Do moving clocks always run slowly?"
The \Large command (and its friends like \small) don't work in math mode, unfortunately, even in proper LaTeX. You can cheat, though, using an mbox like this: Mark-up: \mbox{\Large\(...
Liked On: 06-25-2014, 11:49 PM
4. Markus Hanke liked post by btr On thread : Gravity resulting from lensing
Not bonkers, no, but the scalar aspect is certainly inconsistent with the full theory of General Relativity. To pick a simple example, with a scalar theory of gravitation the gravitational waves...
Liked On: 06-24-2014, 07:16 AM
5. Hal on Earth liked post by btr On thread : Non-inertial clock orbiting an inertial clock: "Do moving clocks always run slowly?"
Hello, Hal on Earth. In Special Relativity, the proper time an observer experiences is given by a kind of four-dimensional analogue of "length". Essentially, you use a modified version of...
Liked On: 06-18-2014, 01:37 AM
6. Jilan liked post by btr On thread : Non-inertial clock orbiting an inertial clock: "Do moving clocks always run slowly?"
Hello, Hal on Earth. In Special Relativity, the proper time an observer experiences is given by a kind of four-dimensional analogue of "length". Essentially, you use a modified version of...
Liked On: 06-17-2014, 07:59 PM
7. Markus Hanke liked post by btr On thread : Does Dark Matter repel other dark matter?
I'd say that gravity-only, non-CDM models for the data have been considered in great depth. There is a very large family of dark-matter-free, gravity-only theories which can reproduce most, if not...
Liked On: 06-11-2014, 07:31 AM
8. Jilan liked post by btr On thread : Trigonometric function and Gaussian function integration
It isn't that messy, it turns out. There is a neat trick, but the justification of it requires some advanced concepts like contour integrals in the complex plane. I will just give an overview. ...
Liked On: 06-10-2014, 06:41 AM
9. pienapple27 liked post by btr On thread : Not so smart question about linear stuff
If you want to talk about two things (say, x and y) increasing together in some sense, you probably have in mind that both quantities depend on some third variable (call it t, say; perhaps t...
Liked On: 06-06-2014, 05:25 PM
10. pienapple27 liked post by btr On thread : Not so smart question about linear stuff
Bingo.
Liked On: 06-05-2014, 10:55 PM
11. Jilan liked post by btr On thread : Does Newton's Third Law apply to electrostatic forces in Curved Space-Time?
It might be a good strategy to start by considering the much simpler case of two "stationary" world-lines (i.e. field lines of the timelike Killing vector) that are extremely close together, and very...
Liked On: 06-04-2014, 05:18 AM
12. Markus Hanke liked post by btr On thread : Turning light into matter
I'm afraid that it really isn't a question of interpretation; in QED, the only interactions which can ever take place between charged particles are via the electromagnetic field, and the only...
Liked On: 05-30-2014, 01:10 PM
13. Farsight liked post by btr On thread : Turning light into matter
I'm afraid that it really isn't a question of interpretation; in QED, the only interactions which can ever take place between charged particles are via the electromagnetic field, and the only...
Liked On: 05-28-2014, 05:01 PM
14. KJW liked post by btr On thread : Turning light into matter
I'm afraid that it really isn't a question of interpretation; in QED, the only interactions which can ever take place between charged particles are via the electromagnetic field, and the only...
Liked On: 05-28-2014, 09:56 AM
15. tk421 liked post by btr On thread : Turning light into matter
I'm afraid that it really isn't a question of interpretation; in QED, the only interactions which can ever take place between charged particles are via the electromagnetic field, and the only...
Liked On: 05-28-2014, 05:52 AM
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