What Is Pure Einstein Gravity?

latentcorpse
Messages
1,411
Reaction score
0
What does "pure Einstein gravity" mean?

Thanks.
 
Physics news on Phys.org
It usually means the physics described by the Einstein-Hilbert action alone, with a torsion-free connection. This is in contrast to theories that couple matter or EM fields to gravity, or that include higher-order curvature terms in the action.
 
Thread 'Need help understanding this figure on energy levels'

Thread 'Need help understanding this figure on energy levels'

This figure is from "Introduction to Quantum Mechanics" by Griffiths (3rd edition). It is available to download. It is from page 142. I am hoping the usual people on this site will give me a hand understanding what is going on in the figure. After the equation (4.50) it says "It is customary to introduce the principal quantum number, ##n##, which simply orders the allowed energies, starting with 1 for the ground state. (see the figure)" I still don't understand the figure :( Here is...
View full post »
Thread 'Understanding how to "tack on" the time wiggle factor'

Thread 'Understanding how to "tack on" the time wiggle factor'

The last problem I posted on QM made it into advanced homework help, that is why I am putting it here. I am sorry for any hassle imposed on the moderators by myself. Part (a) is quite easy. We get $$\sigma_1 = 2\lambda, \mathbf{v}_1 = \begin{pmatrix} 0 \\ 0 \\ 1 \end{pmatrix} \sigma_2 = \lambda, \mathbf{v}_2 = \begin{pmatrix} 1/\sqrt{2} \\ 1/\sqrt{2} \\ 0 \end{pmatrix} \sigma_3 = -\lambda, \mathbf{v}_3 = \begin{pmatrix} 1/\sqrt{2} \\ -1/\sqrt{2} \\ 0 \end{pmatrix} $$ There are two ways...
View full post »

Similar threads

A Mixed quantum state of the Bose-Einstein distribution
Replies
3
Views
797
Finding state vectors for pure states
Replies
1
Views
1K
Relativity Reviews of “Gravity: An Introduction to Einstein’s General Relativity”
Replies
3
Views
3K
A Why is matter-free gravity not ultraviolet finite?
Replies
13
Views
3K
Solving the Einstein Gravity Tensor for the Newton Potential
Replies
1
Views
1K
Why can we always choose energy eigenstates to be purely real function
Replies
2
Views
2K
I Gravity of the Sun: Einstein's Calculation and Beyond
Replies
1
Views
1K
I Einstein's purely algebraic physics and "my entire castle in the air"
Replies
5
Views
2K
B Gravity and speed of information for orbiting planets
Replies
22
Views
473
B Is There an Alternative Approach to Learning Pure Math for Beginners?
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top