Time travel is possible in an infinite universal paradigm. Say you grow up and when you're thirty you get the opportunity to time travel. So you take it and go back to when you were fifteen to tell yourself something. Thing is you would be able to but you wouldn't back track to the universe where you gre up in. Such as people think with every possible out come there is a new universe created; you have choice between a glass of water or milk, you choose milk, there is an infinite amount of other universes that branch off in a different direction where you chose water. Even considering very small things like placement of atoms in your body, or large things like who won world war II.
So much like every choice you make creates a new universe, you would make a choice to time travel your time traveling self would take you to a universe in which you visit yourself at 15 from the future and change something or tell yourself something. So you wouldn't change anything in your universe's "you" only in an infinite number of universes that branched out from that universe in which your time traveling self visited.
Also thing to consider, say the universe in which you were taken to, didn't have the capability of sending you back to the universe in which you came, what happens to you?
Well they either have the technology to send you forward in time, through the same universe, which will take you to the future in which you initially set up for yourself by visiting your past self in that universe. OR if they don't yet have THAT technology you will live simultaneously as a 15 year old and a 30 year old time traveller from an alternate universe. Which would be a mind fuck.
BUT if you could be sent back from the universe in which you travelled to, to the universe in which you initially started your time traveling journey from, nothing would be different, you probably wouldn't have seemed like you time travelled at all. Most likely it would be like stepping into the time machine and stepping out took virtually no time. Your time travel to a new split universe would happen such as split universes happen right now. Simultaneously and fluidly as you live your life. So you would step in, a "you" would split off and time travel and return simultaneously as you stepped in and it would be done. Nothing in your universe would be changed,however the life of the 15 year old you in an alternate universe would be changed drastically, setting a course for another set of infinite tangent universes where anything that is possible can and does happen.
If this is confusing. Think as me writing this. With every passing millisecond there are an infinite amount of universes being created, generalized by time and movement.
Say that last sentence took me 10 seconds to write. There are an infinite number of universes where that sentence took me 10.0000000000000001 seconds to write. and another infinite set where it took me 9.9999999 seconds to write, and so forth and so forth, it is a universal and numerical fractal. As numbers are infinite and so are the universes created. Also with every movement my cells and atoms make in my body as i type this there are infinite amount of universes being created where a cell that just now died in my hand doesn't die for another hour. AND THAT IS JUST ONCE CELL. There are billions if not trillions of cells in your body, sooo many possibilities.
And people think of well in alternate universes I am a famous actor... yes, there are infinite amounts of universes where you are that, there are infinite amounts where you do not exist. there are infinite amounts where you are ruler of the universe there are infinite amounts where it is the exact same life you lead right now except one cell in your body is changed, or where one blade of grass across the globe doesn't exist. (something so irrelevant to your life, there is an infinite amount of universes in which that blade of grass has one cell changed, or it doesnt exist at all, but all life that has been and will be is exactly the same as it is in this universe.
BOOM
My mind was blown, so is yours, and I just became all knowing and turned into pure conscious energy and light.
