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Gold Barz
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For example if our universe had different laws would gravity as we know it now still be the same with different laws?
Depends. The law of gravity is one of those laws but (so far I believe) it stands isolated from the other laws of physics?Gold Barz said:For example if our universe had different laws would gravity as we know it now still be the same with different laws?
Interesting. My understanding is that in the Ekpyrotic model the collision of two branes was the precursor to the Big Bang, and that the four forces (that we know of) subsequently condensed out in a form of spontaneous symmetry-breaking... as far as I am aware the symmetry-breaking is supposed to have been completely arbitrary and there is no causal relationship between the branes and the precise properties of subsequent forces we observe - including gravity.Gold Barz said:All of them
but in the brane-theory they say that gravity would not get changed, is that true?
moving finger said:Therefore, run the universe again and you would likely end up with completely different force laws.
Gold Barz said:For example if our universe had different laws would gravity as we know it now still be the same with different laws?
Gold Barz said:For example if our universe had different laws would gravity as we know it now still be the same with different laws?
ohwilleke said:...your question itself seems a bit absurd. If the universe had different laws, gravity would be the same, unless it was one of the laws that was different.
Gold Barz said:Yeah I was trying to ask...
I guess I'll need to read the book, but I'm not sure I see why gravitation needs to be any more fundamental than the other forces. The curvature of space depends on the masses within that space, and the properties of those masses depend on the symmetry breaking that is supposed to have occurred way back when. Space did not exist prior to there being any objects within that space. What you are suggesting is that the geometrical properties of 3D space (at least the gravitational properties) were somehow pre-defined before the number of dimensions was determined and before space, matter or time existed. Rovelli is entitled to his opinion, but I don't see that this necessarily follows. The whole thing seems interconnected to me.marcus said:to speculate a little, i would guess that if you could ask this question to Carlo Rovelli, whose book Quantum Gravity just came out, he would answer Yes, the gravitational field is somehow more basic than the other fields.
for him, everything is fields but the other fields "ride on" the gravitational field.
this may be typical of how relativists (specialists in general theory of relativity) think, as contrasted with people who picture there being a kind of rigid absolute space with a predetermined geometry in which all the fields (whether called particles or forces, and gravity included) are defined.
relativists think of the gravitational field as the dynamic changeable geometry of the space within which other fields are defined. and they see the gravitational field as responding to matter as it moves around.
so there is no fixed predetermined geometric framework, for the relativists,in an image rovelli has in his book, everything is animals (i.e. fields) but the other animals are riding on the whale's back
Gravity is a fundamental force that is governed by the laws of physics. Therefore, any changes to the laws of physics would have a direct impact on the behavior of gravity. For example, if the laws of physics were to change in such a way that mass was no longer conserved, this would have a significant impact on how gravity behaves.
No, gravity cannot exist without the laws of physics. As mentioned earlier, gravity is a fundamental force that is governed by the laws of physics. Without these laws, there would be no framework for gravity to operate within.
Yes, if the laws of physics were to change, it could potentially impact the strength of gravity. For example, if the laws of physics were to change in a way that altered the properties of mass or distance, this could affect the strength of the gravitational pull between objects.
If the laws of physics were to change, the behavior of objects in a gravitational field would also change. This could include changes in the trajectory, speed, or acceleration of objects. Additionally, the laws of physics also dictate the properties of matter, so any changes to these laws could also affect how objects respond to gravity.
It is not possible to definitively answer this question as it is purely hypothetical. However, if the laws of physics were to change in a way that completely contradicts the current understanding of gravity, it is possible that gravity could cease to exist. However, this is purely speculative and cannot be proven without concrete evidence of such changes to the laws of physics.