can anyone explain me what's the difference between time travel and time reversal?
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Time travel is the concept of movement between certain points in time, analogous to movement between different points in space by an object or a person, typically using a hypothetical device known as a time machine. Time travel is a widely-recognized concept in philosophy and fiction. The idea of a time machine was popularized by H. G. Wells' 1895 novel The Time Machine.
Time reversal
Yes, time reversal. Wow! you say. Reversing the flow of time?
Perhaps no other term in modern physics inspires as much fascination and awe in the general public. Consider the enormous popularity of such recent movies as Back to the Future I, II, and III, The Terminator, and Peggy Sue Got Married. But those people curious enough to trudge to a library and look up time reversal in an advanced physics text--for instance, chapter 4 in the classic by J. J. Sakurai, which I studied as a student--are bound to be disappointed. Physicists do not know how to arrange for you to go back to your high school days and see teen romance with the wisdom of an adult, as Kathleen Turner did. Nor can they send you or Michael J. Fox back in time to help your father beat out his competitor for the affection of your mother. Sorry to disappoint you, but we physicists haven’t the foggiest idea how to reverse the flow of time
Time reversal
Yes, time reversal. Wow! you say. Reversing the flow of time?
Perhaps no other term in modern physics inspires as much fascination and awe in the general public. Consider the enormous popularity of such recent movies as Back to the Future I, II, and III, The Terminator, and Peggy Sue Got Married. But those people curious enough to trudge to a library and look up time reversal in an advanced physics text--for instance, chapter 4 in the classic by J. J. Sakurai, which I studied as a student--are bound to be disappointed. Physicists do not know how to arrange for you to go back to your high school days and see teen romance with the wisdom of an adult, as Kathleen Turner did. Nor can they send you or Michael J. Fox back in time to help your father beat out his competitor for the affection of your mother. Sorry to disappoint you, but we physicists haven’t the foggiest idea how to reverse the flow of time
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