Thread: Are Universal laws allow to go in past?

Is it possible to go in past even when traveling with speed of light ?

No it is not logically acceptable as Universal Laws can never allow it.

Space is an entity and shares the same present in its every part.

What is present ? Present means a special time when everything is occurring. We call past everything that happened. Some events shared same past and some are sharing same present.

What is past? A particular past is situation and condition of everything in space at particular event .
A small thing even travelling with speed of light can never have such energy that change physical conditions of entire mass/energy in space.

It is clearly impossible to go in past.

Actually yes, there are experiments in which particles going backwards like double slit, Bell, and a delayed choise.
But in reality normal people experience (de Ja vu) where reality go Twice time and you live the past and you can Influence it

No, entire space shares a common present , this makes it impossible to go into past.
Yes time spending rate may increase or decrease but go into past which is shared by entire space impossible.
It may be possible only if time is a physical quantity which is not!

Universal laws are against it.

This may not be correct. Consider this quote from the relvant Wikipedia article:

In mathematical physics, a closed timelike curve (CTC) is a world line in a Lorentzian manifold, of a material particle in spacetime that is "closed," returning to its starting point. This possibility was first raised by Kurt Gödel in 1949, who discovered a solution to the equations of general relativity (GR) allowing CTCs known as the Gödel metric; and since then other GR solutions containing CTCs have been found, such as the Tipler cylinder and traversable wormholes. If CTCs exist, their existence would seem to imply at least the theoretical possibility of time travel backwards in time.....

Originally Posted by Water Nosfim

Actually yes, there are experiments in which particles going backwards like double slit, Bell, and a delayed choise.

Has it actually been shown that they go "backwards" or is this just your interpretation?

But in reality normal people experience (de Ja vu) where reality go Twice time and you live the past and you can Influence it

Rubbish.

Originally Posted by RAJ_K

No, entire space shares a common present

Hard to prove though, since Einstein showed there's no such thing as simultaneity.

If you want something to argue about, Like the directionality of time at the end of a black hole, but there is not so fun like here

Einstein could only prove different spending time rate on different places at different speeds. Speeds make effects on
mechanical spending of time or time spends fast or slow.
But every event occurs in present at all places of space no matter what is time spending rate.
Suppose Current time is 9:00P.M. At time of 9:02PM an objects travels at speed of light. It is never possible to return in past
i.e. at 9:00PM . 9;00PM is a particular point of past when entire mass/energy in space share a common present. It is not possible make a so strong change in a system when space itself is a physical reality . As we know time is not a physical quantity, So it is impossible to go in past when all events in entire space shared a common past. Yes if time exists as physical quantity than it may be possible but it is not.

If you take a perfectly symmetrical like the" twins" you get contradiction. And physically divided the way to speed gives something ( try to go in it like time )

Originally Posted by RAJ_K

Einstein could only prove different spending time rate on different places at different speeds.

Therefore differing speeds means differing "presents".

But every event occurs in present at all places of space no matter what is time spending rate.

But are all of those "presents" the same?

As we know time is not a physical quantity

Is it not? It's as useful in physics and physical equations as distance is.

Originally Posted by Water Nosfim

If you take a perfectly symmetrical like the" twins" you get contradiction. And physically divided the way to speed gives something ( try to go in it like time )

Did you specialise in drivel, or is it a natural gift?

If something goes slowly and going fast and they are attached so there is no difference between them but they are not attached and therefore also ( come ) the possibility of going Back

Posting more drivel doesn't answer my question.

Originally Posted by Water Nosfim

If something goes slowly and going fast and they are attached so there is no difference between them but they are not attached and therefore also the possibility of going Back

If something goes fastly and going slow and they are disconnected so there is no difference between them but they are not disconnected and therefore also the possibility of going Forward.


Cloudly toves cholesterol.

Sheep!

See? I can do it too. Not as well perhaps, but I can do it.

One way ?

No, both ways (up and circular) because of chickens.

Its a duck ?

Originally Posted by Water Nosfim

Its a duck ?

I said sheep.

thanks for clearing that up. i was a bit confused there for a while.

Time itself depends on space and space does not depends on time.
It is never possible to go into past as space itself can never allow it.
It is clearly possible to have different events occurring rate at different parts and speed of Space.
But space allows event occurring only in Present no matter what is speed or what is place in space.
Like heat can go only from hot to cold system.

Originally Posted by RAJ_K

Time itself depends on space and space does not depends on time.

Evidence?

It is never possible to go into past as space itself can never allow it.

I have no idea why space should prevent time travel.

But space allows event occurring only in Present no matter what is speed or what is place in space.
Like heat can go only from hot to cold system.

Huh?
And again: are all of those "presents" the same?

Originally Posted by RAJ_K

It is never possible to go into past as space itself can never allow it.
.

so you are disagreeing with the physicists who have demonstrated that time travel is theoretically possible? (I refer you to my post #4 for a link to an introduction to the concept.) May I ask on what authority you are denying the conclusions of experts in the field?

Originally Posted by Water Nosfim

If you take a perfectly symmetrical like the" twins" you get contradiction.

There is no contradiction. Please stop posting nonsense.

Originally Posted by RAJ_K

No, entire space shares a common present

There is no "common present". Time (and space) are observer dependent.

If thay are observer dependent you can say thay are in many worlds and conect it to MWI

Originally Posted by Water Nosfim

If thay are observer dependent you can say thay are in many worlds and conect it to MWI

Please stop posting this meaningless nonsense.

its meaning if you see how to conect SR and QM in way of MWI and time going backwerd

Originally Posted by Water Nosfim

its meaning if you see how to conect SR and QM in way of MWI and time going backwerd

Please stop posting meaningless nonsense.

Water Nosfim,

I am afraid I will have to ask you to keep your nonsense out of the physics subforum. You have never, ever, made a post that makes any sense. You merely pollute the physics section with drivel. Stop it.

Some people think that time moves only forward and to say - even back it annoys them

Maybe it "annoys" people because you don't bother to give any evidence for your assertions.
Why should we take you (or anyone else) seriously if all you do is make unsupported declarations?

@ Strange, I do not know why you are combining Time with present. There is no doubt Time is observer dependent BUT space is not perfectly.

Relativity suggests some possibilities for going in past as geometries of space time or specific types of motion in space.
Although some scientists are not agree with it. It is also suggested that these geometric paths allow only forward opened . It is not proved yet & research is going on and there is no final picture. We all are agree on different time spending rate on different speeds and positions in space.
What is Present ? Present is a space where all events are occurring from micro to macro at same time .
Are you agree?
Are there different presents in Space ? Time may be an illusion but not space.

Originally Posted by Water Nosfim

Some people think that time moves only forward and to say - even back it annoys them

Harold has asked you nicely and I believe I have asked you before as well. I'll ask once more: Please stop posting in the main sections. If you decide to ignore this request I will have no option but to suspend your account for a few days. A repeat offence after that will see you banned permanently. I hope that is clear. Thanks

Neither time nor space are illusions (in physics, anyway; the metaphysical aspects can be left to philosophers). Both are relative and observer dependent. There is no universal present "now" that all observers will agree on.

I'm no expert on any of this stuff but I do believe that you can travel back in time; in a basic way. (ie. on a particle level). I believe that particles are time traveling constantly. I kind of think that past,present and future are running alongside one another; sort of like on different layers.. Logically, where there is a present, there was always a past and there always will be. I mean, if you think about it, we can take snapshots of events and in some way go back in time to review them. Thinks video, think pictures, think databases.. If you google you're time traveling, in a way. Google in itself is a snapshot of the past, as is this forum. That's a simple concept and you may think to yourself, it doesn't apply. I look at it like, if we're living in the present and present is the all accessible then we would have no sense of the past. There'd be no need for snapshots or memories, not for archaeology or time itself. What is time for, what is duration? They don't apply, if all is in present. I do believe that the same way we keep snapshots of past events, so does the universe.

..what's also funny is that we like to look at in on a broader scale, without realizing that we're living in the past-present-future right this moment..or a moment ago, or in a moment..

Water Nosfim,

Some people think that time moves only forward and to say - even back it annoys them

Some people, like myself and seemingly like yourself, might believe time travel backwards in time is impossible which might be entirely correct, but present theory allows for the possibility of it which was the point of the comments to you. In a mainstream forum you might wish to argue for or against varying mainstream hypothesis, or even alternative mainstream theory if you post links to alternative mainstream papers, but definitive unsupported statements against mainstream theory or their related possibilities, should not be made in a mainstream forum.

I suspect you may have a slight language problem and might not fully understand the rules here and their varying implications.

i don't think moving backwards is possile.

if i'd imagine going back to a time where you didn't existed, how is that for entrophy alone? that has to be reverted and not at the same time.