The Grandfather Paradox: A Solution?

The Grandfather Paradox has stumped physicists and philosophers for decades. Summarizing briefly, if time travel is possible, then a time traveler could go back in time to kill their grandfather before the traveler's own mother was conceived. This creates a paradox. If this were the case, then the murderous grandchild would have never existed to be able to kill their grandfather in the first place. This seems to suggest traveling backward in time is impossible.

However, studies suggest that the universe may have predetermined outcomes. Under this hypothesis, the cosmos may intervene to forbid one from changing the future.

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[spacejuggernaut]

Let's change things up a bit.
Say for instance Hitler's parents were interrupted at the time when Adolf was to be conceived, by a few minutes and another sperm made it's way. Now Adolf is a different person, would the time line be the same would WWII still exist. If time travel occurred and a change for occur the returning time traveler will return to a different present, and that time traveler will only know about it. The world would have continued with a different time line. Actually this would have created many altered time lines. This time line may have prevented the time traveler's parents from meeting, or meeting under different circumstances, causing him not to be conceived ( born ), basically the time traveler is not known by anybody, no name, no money, no birth record. Basically he becomes a time traveler into the new future, now changing the new future outcome. Causing the new future time line again to change. In reality caused two paradoxes.
Let's rewind a bit, say the time traveler was unable to return, but had to continue living in the early 1900's, again two paradoxes are created, Adolf was a different person WWII never occurred, now what it's the time traveler marries and created more children. These paradoxes would continue forever, and no one would know the real true time line ( except the time traveler), as it would never have existed.

[davewilliam]

How To Travel Back In Time
1. Build circulating light beams machine.
2. Use circulating light beams machine to travel to year 1955 AD.

[warpromo]

I think the first one goes off the basis that you KNOW you are going to time travel, and you KNOW you are fine, meaning that when you time traveled, nothing occurred to cause a paradox since you are alive and well.

[Timetravel-yweb]

Or maybe you don't go back to the past of the timeline in this universe but rather you
go back in time in a parallel universe.

[suonoblu]

If we consider travel back in time as possible, then Novikov's principle of self-consistency would be the only solution to the grandfather paradox to have a logical coherence, as the multiverse-based solution generates grandfather paradoxes in turn.

[AP-yxde]

There is no grandfather paradox. Once you’ve sent information/matter back in time, it exists in that time. Yes you can kill your grandfather but that just means a future version of you won’t be born, you(the time traveled consciousness) still continue on in the past.

This is really a question of what you are as a person, or rather what you are as a mind. If your mind is duplicated and put into another body, each of you would think you are the “real” you. Same thing goes for teleporting or time traveling, there would now be 2 versions of yourself, the time traveled version, and the version that is born in the future.

There’s no reason to suspect that altering the future can change the present, so why would it be any different if the “present” was 1955 or 2022.

[M.C.Escher]

When did you do this experiment and show me your mathematics.

[aldoringo]

But surely, if you go back in time, then if you use our current theory of time being linear, if you killed you grandfather for example, why would you not still exist? Is the past not now just the present? But the thing is, if you went to the past, the "2nd" present you are now in will have created a whole new timeline altogether, one present with your grandfather, one without. But this is physically possible, because how can a replica of the same universe exist alongside the other? To time travel, you would have to actually travel physically somehow into another universe that was identical to yours however many years before. But on another note, it would be far more feasible to travel just back in time, without then returning to the present. Because in theory, if you could reverse the flow of time to the past, then you would be able to make that past the present. Then the grandfather paradox would be eliminated, and all others, because technically that chunk of time is gone forever. But that would mean that, in order to time travel in this way, you would have to somehow reverse the matieral state of the universe, which is clearly impossible because you would need to be God for that lol. So conclusion, I dont think time travel is physically possible, so I agree with hawking.

[Zerkyo]

The whole concept isn't even a paradox. If I was to go back in time and kill my parents, the moments before I went back in time would be my past and moments after I kill my parents would be my future. Time is cyclical, not linear