Is this an acceptable way to describe gravity

1. May 6, 2013

49ers2013Champ

Instead of saying that matter and energy curve spacetime, could one say: space and time curve around the presence of matter and energy?

2. May 6, 2013

WannabeNewton

I see literally no difference in those two statements.

3. May 6, 2013

49ers2013Champ

Ha! That's good. Because when I read the second way of describing gravity, it makes things much clearer.

4. May 6, 2013

phinds

No, I think the second part needs to be " ... spacetime curves around ... "

I don't think "space and time" is the same as "spacetime" since the former implies that they are separate things and that is NOT a good way of looking at things in GR.

5. May 6, 2013

49ers2013Champ

Newton:

Do you agree with Phinds?

6. May 6, 2013

WannabeNewton

Honestly, I'm not a fan of putting things in words. The wording of physical principles can be quite subjective and ambiguous. As far as general relativity is concerned, $G_{ab} = 8\pi T_{ab}$ is the fundamental relationship between the matter fields and the space-time metric. You can decorate that statement however you like if it makes things clearer but the basic principle is as stated above. It is certainly true that space-time is a single entity but the semantic details can, as I said, be quite subjective and ambiguous. This is why things are presented mathematically.

7. May 6, 2013

49ers2013Champ

Newton, I have another question, and I'll just ask it here instead of start another thread. I'm watching a DVD and it is discussing, among other things, the "Theory of Everything" and the way in which we'll arrive at it. Below is the graphic presented in the DVD.

Electricity.....Magnetism (separation between these two) Gravity
Electromagnetism......Weak force
Electroweak force......color force
Grand Unified Force

Theory of Everything (arrows connecting gravity with Grand Unified Force)

Where are the strong and weak nuclear forces?

Last edited: May 6, 2013
8. May 6, 2013

phinds

Just FYI, it is strongly discouraged on this forum to start a new question in the same thread. Start a new thread for a new question.

Also, Google is your friend. Strong and weak forces are very well-known terms.

9. May 6, 2013

49ers2013Champ

Okay, Phinds. I'll ask it on another thread. I was just trying not to take up too much room.

10. May 6, 2013

Staff: Mentor

Also, this is probably not the best forum to post questions about the strong and weak forces; either the quantum physics forum or the high energy particle physics forum would probably be better, if you have questions after you've Googled.

11. May 6, 2013

Mordred

When you repost your question send me a PM and I can assist you on the TOE and GUT