/sci/ - Science & Math

So it seens to me paradox free time travel is possible if the past you are traveling has no causal relationship with the current you.
And this is can achieved if the time machine moves you not only in time but in space.
If you travel back in time one year but also are placed one lightyear away nothing you do there will effect your past since it takes one year for any action there to have any effect on the you befire you left .
This may not seem very useful
But it could be used for space exploration were a probe is sent backwards into time several years /light years and to us it would appear to us as if it is immediately sending back data about the star system .

So setting aside the technological feasibility aside does this violate any of the math in physics?

How do we know the universe is not of constant size?

>inb4 because it is expanding
Yes but couldn't that just mean that the space time continuum is stretching and the edges are being "trimmed off" because of a loss of energy?
So imagine pair production could occur at the edge of a static universe, one of the subatomic particles would for all intents and purposes be lost, ergo we have lost energy, ergo the space time continuum stretches while the universe's size remains the same, right?
Maybe there's another piece of evidence I'm missing but Hubble's shit just seems a little too weak to me.

Why is gravity so ignored in modern science? It is the biggest mystery. It is an invisible, unknown force that pulls all mass together. It is the foundation of the universe, the foundation of life. It has no scientific explanation.

And yet, it is barely looked at or talked about. Scientists simply use it as a formula. Really, nearly every scientist should be obsessed with figuring out what gravity is and how it works. Why aren't they?

Gravity works by slowing down light. Space time is a myth. When anything bends the inside curve moves slower.

is it possible to warp space in a non smooth manner? like say you wanted to make notches or holes topologically speaking, can there be an arrangement of mass that would lead to such a phenomenon, or is space inherently smooth and uniform around a massive body?

can space and time be artificially shaped?

Is this picture of spacetime a lie? How would this "local spacetime" even work for objects that are above or below earth?

If 4D spacetime exists, and we are not a 3D world that moves through time, but instead a 4D spacetime that just is, then does it say that the past is still there? If so, does it mean we could theoretically access/measure/observe the past in some way?

∣∣∣32−4−32−4∣∣∣|32−4−32−4|?

Hi /sci/
Doing an assignment on quantum gravity. Tell me everything you know
Ty

Is the theory that gravity exerts it's effects by bending space an observed phenoma, or a product of the mathmatical models with which we explain it?

>>8003570

so if we are moving away from a galaxy, and that galaxy is moving away from us, at over 6 times the speed of light.

how are we able to observe that light now.

if both are moving away from each other. it would be impossible to observe that light.

Have gravity been proven? i don understand what gravity is or how it works. how is this a proven theory, when no one can prove gravity exist?

i dint get it.

How can gravity be real if so many physicists say that they don't get it?

Is this counterintuitive or is it obvious and my brain is just in retard mode?

There are two masses called A and B, 100 kg and 10 kg respectively each held aloft separately by a helium balloon big enough to cancel out the gravitational pull on each mass. Therefore both masses are hovering at a fixed point above Earth.

Now here's the "counterintuitive" bit: If you put a 5 kg mass on each, B will fall to Earth 7 times faster than A. It feels counterintuitive to me because I simply thought that the acceleration was the same for both because they both have the same net weight falling to Earth i.e 5kg. I understand why now but was I dumb for not getting it the first time?