On modified theories of gravity

  • #1

Main Question or Discussion Point

I am confused about the modified theories of gravity. We all know there is the Schwarzchild solution for GR. The solution can give right prediction for the solar-system experiments, such as Light deflection, perihelion shift of the Mercury and gravitational time delay. Whether all kinds of modified theories of gravity should have the same Schwarzchild solution, otherwise they will be ruled out by the solar-system experiments. I know some modified theories of gravity don't have the Schwarzchild-like solution for spherically symmetric vaccum spacetime.
 

Answers and Replies

  • #2
33,804
9,513
They all have to give Newtonian gravity and at least the same first order deviation as GR in weak fields (gravitation in the solar system is weak). They might give different results on a galactic scale (very weak fields) and in strong fields.
 
  • #3
bcrowell
Staff Emeritus
Science Advisor
Insights Author
Gold Member
6,723
422
A good book on this topic is "Was Einstein Right?"
 

Related Threads for: On modified theories of gravity

Replies
4
Views
697
Replies
13
Views
804
Replies
13
Views
862
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
3
Views
1K
Replies
23
Views
4K
Top