The Basics of General Relativity Explained

yukcream
Messages
59
Reaction score
0
what is general relativity really talk about?
 
Physics news on Phys.org
Please note that if you scroll a little bit further down the PF list, we DO have a section devoted to Special and General Relativity. Please post all future questions related to this topic on that section.

Zz.
 
yukcream said:
what is general relativity really talk about?

The short version is that General Relativity extends special relativity so that the resulting theory includes gravity.
 
Special Relativity - Reconciled Newton's mechanics and Maxwell's electromagnetism...but only for things in uniform motion (non accelerating reference frame). Time and space are relative. Speed of light is constant.

General Relativity - Expanded SR to include acceleration and gravity. Provides a theory of gravity (warped spacetime).
 

Thread 'I don't see how a black hole's event horizon can be crossed'

OK, so this has bugged me for a while about the equivalence principle and the black hole information paradox. If black holes "evaporate" via Hawking radiation, then they cannot exist forever. So, from my external perspective, watching the person fall in, they slow down, freeze, and redshift to "nothing," but never cross the event horizon. Does the equivalence principle say my perspective is valid? If it does, is it possible that that person really never crossed the event horizon? The...
View full post »

Thread 'Question about Parallel Transport'

In this video I can see a person walking around lines of curvature on a sphere with an arrow strapped to his waist. His task is to keep the arrow pointed in the same direction How does he do this ? Does he use a reference point like the stars? (that only move very slowly) If that is how he keeps the arrow pointing in the same direction, is that equivalent to saying that he orients the arrow wrt the 3d space that the sphere is embedded in? So ,although one refers to intrinsic curvature...
View full post »

Thread 'Synchronizing clocks in an inertial frame if light is anisotropic'

ASSUMPTIONS 1. Two identical clocks A and B in the same inertial frame are stationary relative to each other a fixed distance L apart. Time passes at the same rate for both. 2. Both clocks are able to send/receive light signals and to write/read the send/receive times into signals. 3. The speed of light is anisotropic. METHOD 1. At time t[A1] and time t[B1], clock A sends a light signal to clock B. The clock B time is unknown to A. 2. Clock B receives the signal from A at time t[B2] and...
View full post »

Similar threads

A A global energy conservation law in general relativity
Replies
36
Views
517
B Why do people care about vacuum solutions in GR?
Replies
9
Views
1K
I GR as Gauge Theory
Replies
2
Views
2K
I An alternative derivation of the equation of motion in General Relativity
Replies
0
Views
1K
B Very simple exercises in General Relativity
2
Replies
57
Views
3K
I Does the metric in general relativity depend only on position because of the equivalence principle?
Replies
16
Views
2K
I Modeling the Earth and Sun (2 body orbits) using general relativity?
2
Replies
62
Views
6K
B General Relativity and Universal Gravitational Constant
Replies
27
Views
2K
A Does Spacetime Absorb Energy in General Relativity?
Replies
17
Views
2K
B General relativity and frame of reference
Replies
12
Views
1K

Hot Threads

Recent Insights

Back
Top