What is grandfathers paradox?. Well obviously you are intrested to know so i will start with the basic book definition and then extend it more deeper level.
paradox: a statement or proposition that seems self-contradictory or absurd but in reality expresses a possible truth.
Definition:
The grandfather paradox is a paradox of time travel, The paradox is this: suppose a man traveled back in time and killed his biological grandfather before the latter met the traveller's grandmother. As a result, one of the traveller's parents (and by extension, the traveller himself) would never have been conceived. This would imply that he could not have travelled back in time after all, which in turn implies the grandfather would still be alive, and the traveller would have been conceived, allowing him to travel back in time and kill his grandfather. Thus each possibility seems to imply its own negation, a type of logical paradox.
The grandfather paradox has been used to argue that backwards time travel must be impossible. However, a number of possible ways of avoiding the paradox have been proposed, such as the idea that the timeline is fixed and unchangeable, or the idea that the time traveler will end up in a parallel timeline, while the timeline in which the traveler was born remains independent.
My views:
One of my own views is that, the timeline however always remain intact. what i mean to say is, it is a source of permanent notion. You cannot change it. but you may ask what happens if as stated above some "X" goes in to past and kills "Y" who was responsible for killing his wife . But still his wife will be dead in actual timeline, because if "Y" will not kill her the time line will change in such a way that she will die , and the actual timeline will not be effected, ironic to above one which states there are 2 parallel timelines.
To put in simple terms " you are of what you were" and what you are depends of several reasons, not only being born( what about cloning, they dont have any parents?)
2 more popular theories which are present, in this field are
Novikov self-consistency principle: (a principle similar to mine)
Backwards time travel could be possible without a danger of paradoxes. According to this hypothesis, the only possible timelines are those which are entirely self-consistent, so that anything a time traveler does in the past must have been part of history all along, and the time traveler can never do anything to prevent the trip back in time from being made since this would represent an inconsistency. In laymen's terms, this is often called destiny, and it is sometimes unpopular because it contradicts the "common sense" notion that we choose our own fates.Parallel universes/alternate timelines
There could be "an ensemble of parallel universes" such that when the traveller kills the grandfather, the act took place in (or resulted in the creation of) a parallel universe in which the traveller's counterpart will never be conceived as a result. However, his prior existence in the original universe is unaltered.
Examples of parallel universes postulated in physics are:
- In quantum mechanics, the many-worlds interpretation suggests that every seemingly random quantum event with a non-zero probability actually occurs in all possible ways in different "worlds", so that history is constantly branching into different alternatives. The physicist David Deutsch has argued that if backwards time travel is possible, it should result in the traveler ending up in a different branch of history than the one he departed from.[4] See also quantum suicide and quantum immortality.
- M-theory is put forward as a hypothetical master theory that unifies the five superstring theories, although at present it is largely incomplete. One possible consequence of ideas drawn from M-theory is that multiple universes in the form of 3-dimensional membranes known as branes could exist side-by-side in a fourth large spatial dimension (which is distinct from the concept of time as a fourth dimension) - see Brane cosmology. However, there is currently no argument from physics that there would be one brane for each physically possible version of history as in the many-worlds interpretation, nor is there any argument that time travel would take one to a different brane.
One obvious reason for which i disagree with the fact of above theory is, suppose man goes to a time when earth was being created and prevent it from being made at all then, there would be no man , no time line, then there is no question parallel timelines.
But if we take my theory and put the same fact if we destroy some "x" planet which started to accumulate and make earth, there will be some "y" planet will be present which will be destined to make Earth because the timeline knew that we would do this stuff and it moulded itself from the starting to accomplish the result.
My theory will become more strong by the below story, taken from " all you zombies"
A baby girl is mysteriously dropped off at an orphanage in Cleveland in 1945. "Jane" grows up lonely and dejected, not knowing who her parents are, until one day in 1963 she is strangely attracted to a drifter. She falls in love with him. But just when things are finally looking up for Jane, a series of disasters strike. First, she becomes pregnant by the drifter, who then disappears. Second, during the complicated delivery, doctors find that Jane has both sets of sex organs, and to save her life, they are forced to surgically convert "her" to a "him." Finally, a mysterious stranger kidnaps her baby from the delivery room.
Reeling from these disasters, rejected by society, scorned by fate, "he" becomes a drunkard and drifter. Not only has Jane lost her parents and her lover, but he has lost his only child as well. Years later, in 1970, he stumbles into a lonely bar, called Pop's Place, and spills out his pathetic story to an elderly bartender. The sympathetic bartender offers the drifter the chance to avenge the stranger who left her pregnant and abandoned, on the condition that he join the "time travelers corps." Both of them enter a time machine, and the bartender drops off the drifter in 1963. The drifter is strangely attracted to a young orphan woman, who subsequently becomes pregnant.
The bartender then goes forward 9 months, kidnaps the baby girl from the hospital, and drops off the baby in an orphanage back in 1945. Then the bartender drops off the thoroughly confused drifter in 1985, to enlist in the time travelers corps. The drifter eventually gets his life together, becomes a respected and elderly member of the time travelers corps, and then disguises himself as a bartender and has his most difficult mission: a date with destiny, meeting a certain drifter at Pop's Place in 1970.
The question is: Who is Jane's mother, father, grandfather, grand mother, son, daughter, granddaughter, and grandson? The girl, the drifter, and the bartender, of course, are all the same person. These paradoxes can made your head spin, especially if you try to untangle Jane's twisted parentage. If we drawJane's family tree, we find that all the branches are curled inward back on themselves, as in a circle. We come to the astonishing conclusion that she is her own mother and father! She is an entire family tree unto herself.
It is totally confusing , right? Well not really. The point you should see is that the present that is at the top in the pic of bartender of present dint change because of the past.! The past readjusts itself to meet the same future, it is like in the movie "Final destiny". those group of people future is that they have to die. Whether by plane crash or by a knife, the past readjust such that you are dead in the present. To write on this topic, there is lot of stuff but time doesnt permit me nowdays.!
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