Can gravity exist without mass?

[NYSportsguy]

well empty space does not mean that there is zero energy , and as relativity says energy is equivalent to mass , and mass create gravity . hence if space -time is there then i think gravity is also there.

Quantumcore pretty much hit it on the head. If you think about it are there stars that lay just by themselves in the universe? Most, if not all stars I believe tend to be in clusters around galaxies. The super massive black hole in the center of these (all the galaxies) of the universe cause this. It is the super dense state of these black holes that cause the the starts to be somewhat revolving around them (what we know as gravity) in a galaxy like state to begin with.

If you still don't believe me...just ask Einstein.

 

[HitchHiked]

It is the super dense state of these black holes that cause the the starts to be somewhat revolving around them (what we know as gravity) in a galaxy like state to begin with.

That's a massive span of energy from "mass", emanating from the super massive black hole (at center of galaxy) all the way out to the most distant stars, and steering them around the galactic center. And why are they planar and not symmetrical spheroid?

Is there still "mass" present at these outer points, where gravity is obviously moving these stars? The argument (I guess) is that there's a field present but from it's origin, many light years away.

 

[Naty1]

Does gravity exist if the universe is devoid of all matter, including the dark-matter?

well empty space does not mean that there is zero energy , and as relativity says energy is equivalent to mass , and mass create gravity . hence if space -time is there then i think gravity is also there.

is one view which makes sense.

The relates to when pressure and energy appeared in the universe with a gravitational field:

From Fabric of the Cosmos, Brian Greene:

how does gravity emerge from various initial conditions, big bang ...from grand unification conditions...Higgs fields appear during spontaneous symmetry breaking and give rise to mass...Above 10^28 degrees the other three forces were unified...

So it sounds like sometime before 10^-12 and slightly after t=0 seconds gravity existed without mass...and I guess that might vary depending on which model is used...

 

[chis]

The simple answer is no. Without mass nothing exists, most importantly perception. Move away from a body of mass/perception and your perception decreases slightly. Astronaughts experience this reduction in perception through altered taste and spatial perception reduction. Trouble with docking and a strange taste reaction to favorite foods are examples. Over large tracts of reduced mass or empty space light is the only dimension that we can percive truly.
With no mass gravity would be infinite and pure, but there would be no one able to percive it.

 

[TheJackel]

I'm curious, I've been doing a lot of reading about Quantum Electrodynamic physics.. Under this theory it asserts that only on average that there is nothing to where energy is borrowed from the future with the stipulation that it must quickly be returned.. This being the process of particle and anti-particle emergence and collisions to where they quickly destroy each other.

Now I have a problem with the term nothing in understanding how this could be possible to exist. Because I see this as claiming that a -1 energy or -1 spatial dimension would some how be capable of existing. So I am wondering if anyone has considered that the Universal set is energy itself to where all of existence is entirely comprised of energy..

So is nothing really a no-thing or zero base energy that can't be measured because it's the base minimum to all existence? So on an energy scale there would be no literal zero energy but a zero base energy that vibrates or self-osculates to drive emergence vs borrowing energy from the future.. Hence, a representation of (0,1) to where it's only perceived to be nothing, but in reality it really isn't nothing but no-mass energy at it's lowest possible energy level or complexity..

This is where 0 = no other objects or levels of energy above zero base energy at any given focal point regardless if there is an infinite number of neighboring 0's.. And this is where 1= the base energy or the only object at any given focal point regardless if there are an infinite number of other neighboring 1's.. Can this be represented similar to Qbits in concept?

And sorry if this seems like a dumb question because I'm not a physics major.. I am just curious..

 

[astronomer121]

Hope this will help u http://gravity-nirmal.blogspot.com