The maths checks out—and the results are the stuff of science fiction," Dr. Costa said.
"Say you traveled in time, in an attempt to stop COVID-19's patient zero from being exposed to the virus. However if you stopped that individual from becoming infected—that would eliminate the motivation for you to go back and stop the pandemic in the first place. This is a paradox—an inconsistency that often leads people to think that time travel cannot occur in our universe. Some physicists say it is possible, but logically it's hard to accept because that would affect our freedom to make any arbitrary action. It would mean you can time travel, but you cannot do anything that would cause a paradox to occur."
The researchers say their work shows that neither of these conditions have to be the case, and it is possible for events to adjust themselves to be logically consistent with any action that the time traveler makes.
"In the coronavirus patient zero example, you might try and stop patient zero from becoming infected, but in doing so you would catch the virus and become patient zero, or someone else would. No matter what you did, the salient events would just recalibrate around you. This would mean that—no matter your actions—the pandemic would occur, giving your younger self the motivation to go back and stop it. Try as you might to create a paradox, the events will always adjust themselves, to avoid any inconsistency. The range of mathematical processes we discovered show that time travel with free will is logically possible in our universe without any paradox."
The research is published in Classical and Quantum Gravity.
https://phys.org/news/2020-09-young-physicist-squares.html
ΚΟΥΡΗΤΗΣ: ΟΥΣΙΑΣΤΙΚΑ ΜΑΣ ΛΕΝΕ ΟΤΙ ΔΕΝ ΜΠΟΡΟΥΜΕ ΝΑ ΔΙΑΜΟΡΦΩΣΟΥΜΕ/ΑΛΛΑΞΟΥΜΕ ΤΟ ΠΑΡΟΝ/ΜΕΛΛΟΝ ΚΑΙ ΠΩΣ Η ΡΟΗ ΤΩΝ ΓΕΓΟΝΟΤΩΝ ΘΑ ΥΛΟΠΟΙΗΘΕΙ ΑΣΧΕΤΩΣ ΤΩΝ ΕΝΕΡΓΕΙΩΝ ΜΑΣ.
ΣΤΟ ΠΑΡΑΔΕΙΓΜΑ ΤΟΥΣ ΑΝ ΤΑΞΙΔΕΨΩ ΣΤΟ ΠΑΡΕΛΘΟΝ ΚΑΙ ΣΤΑΜΑΤΗΣΩ ΤΗΝ ΜΟΛΥΝΣΗ ΤΟΥ ΠΡΩΤΟΥ, ΤΟΤΕ ΣΤΟ ΔΙΚΟ ΜΟΥ ΠΑΡΟΝ ΔΕΝ ΘΑ ΕΧΩ ΤΗΝ ΒΟΥΛΗΣΗ ΝΑ ΤΑΞΙΔΕΨΩ ΣΤΟ ΠΑΡΕΛΘΟΝ. ΣΩΣΤΟ, ΑΛΛΑ Ο ΣΤΟΧΟΣ ΕΠΕΤΕΥΧΘΗ. ΣΤΟ ΠΑΡΟΝ ΜΟΥ ΔΕΝ ΘΑ ΕΧΩ ΙΟ, ΑΡΑ ΓΙΑΤΙ ΝΑ ΕΧΩ ΤΗΝ ΒΟΥΛΗΣΗ ΝΑ ΤΑΞΙΔΕΨΩ ΣΤΟ ΠΑΡΕΛΘΟΝ;
ΔΕΝ ΔΙΑΠΙΣΤΩΝΩ ΟΥΔΕΝΑ ΠΑΡΑΔΟΞΟ ΣΕ ΑΥΤΟ ΤΟ ΠΑΡΑΔΕΙΓΜΑ. ΟΝΤΩΣ ΤΑ ΓΕΓΟΝΟΤΑ ΘΑ ΠΡΟΣΑΡΜΟΣΤΟΥΝ ΓΥΡΩ ΑΠΟ ΤΗΝ ΕΝΕΡΓΕΙΑ ΜΟΥ. ΑΥΤΟ ΔΕΝ ΣΗΜΑΙΝΕΙ ΠΩΣ Ο ΙΟΣ ΘΑ ΥΠΑΡΞΕΙ ΑΝΑΓΚΑΣΤΙΚΑ ΚΑΙ ΤΕΛΙΚΑ ΜΕΣΩ ΕΝΑΛΛΑΚΤΙΚΩΝ ΔΙΑΔΡΟΜΩΝ, ΑΥΤΟ ΣΗΜΑΙΝΕΙ ΠΩΣ Η ΜΝΗΜΗ ΤΟΥ ΙΟΥ ΣΤΟ ΣΥΛΛΟΓΙΚΟ ΑΣΥΝΕΙΔΗΤΟ ΤΟΥ ΚΟΣΜΟΥ ΜΕΤΑ ΤΗΝ ΕΝΕΡΓΕΙΑ ΜΟΥ ΝΑ ΤΟΝ ΑΠΑΛΕΙΨΩ ΔΕΝ ΘΑ ΤΟΝ ΠΕΡΙΛΑΜΒΑΝΕΙ, ΟΥΤΕ ΤΑ ΓΕΓΟΝΟΤΑ ΠΟΥ ΟΔΗΓΗΣΑΝ ΣΤΗΝ ΕΞΑΠΛΩΣΗ ΤΟΥ.
"Say you traveled in time, in an attempt to stop COVID-19's patient zero from being exposed to the virus. However if you stopped that individual from becoming infected—that would eliminate the motivation for you to go back and stop the pandemic in the first place. This is a paradox—an inconsistency that often leads people to think that time travel cannot occur in our universe. Some physicists say it is possible, but logically it's hard to accept because that would affect our freedom to make any arbitrary action. It would mean you can time travel, but you cannot do anything that would cause a paradox to occur."
The researchers say their work shows that neither of these conditions have to be the case, and it is possible for events to adjust themselves to be logically consistent with any action that the time traveler makes.
"In the coronavirus patient zero example, you might try and stop patient zero from becoming infected, but in doing so you would catch the virus and become patient zero, or someone else would. No matter what you did, the salient events would just recalibrate around you. This would mean that—no matter your actions—the pandemic would occur, giving your younger self the motivation to go back and stop it. Try as you might to create a paradox, the events will always adjust themselves, to avoid any inconsistency. The range of mathematical processes we discovered show that time travel with free will is logically possible in our universe without any paradox."
The research is published in Classical and Quantum Gravity.
https://phys.org/news/2020-09-young-physicist-squares.html
ΚΟΥΡΗΤΗΣ: ΟΥΣΙΑΣΤΙΚΑ ΜΑΣ ΛΕΝΕ ΟΤΙ ΔΕΝ ΜΠΟΡΟΥΜΕ ΝΑ ΔΙΑΜΟΡΦΩΣΟΥΜΕ/ΑΛΛΑΞΟΥΜΕ ΤΟ ΠΑΡΟΝ/ΜΕΛΛΟΝ ΚΑΙ ΠΩΣ Η ΡΟΗ ΤΩΝ ΓΕΓΟΝΟΤΩΝ ΘΑ ΥΛΟΠΟΙΗΘΕΙ ΑΣΧΕΤΩΣ ΤΩΝ ΕΝΕΡΓΕΙΩΝ ΜΑΣ.
ΣΤΟ ΠΑΡΑΔΕΙΓΜΑ ΤΟΥΣ ΑΝ ΤΑΞΙΔΕΨΩ ΣΤΟ ΠΑΡΕΛΘΟΝ ΚΑΙ ΣΤΑΜΑΤΗΣΩ ΤΗΝ ΜΟΛΥΝΣΗ ΤΟΥ ΠΡΩΤΟΥ, ΤΟΤΕ ΣΤΟ ΔΙΚΟ ΜΟΥ ΠΑΡΟΝ ΔΕΝ ΘΑ ΕΧΩ ΤΗΝ ΒΟΥΛΗΣΗ ΝΑ ΤΑΞΙΔΕΨΩ ΣΤΟ ΠΑΡΕΛΘΟΝ. ΣΩΣΤΟ, ΑΛΛΑ Ο ΣΤΟΧΟΣ ΕΠΕΤΕΥΧΘΗ. ΣΤΟ ΠΑΡΟΝ ΜΟΥ ΔΕΝ ΘΑ ΕΧΩ ΙΟ, ΑΡΑ ΓΙΑΤΙ ΝΑ ΕΧΩ ΤΗΝ ΒΟΥΛΗΣΗ ΝΑ ΤΑΞΙΔΕΨΩ ΣΤΟ ΠΑΡΕΛΘΟΝ;
ΔΕΝ ΔΙΑΠΙΣΤΩΝΩ ΟΥΔΕΝΑ ΠΑΡΑΔΟΞΟ ΣΕ ΑΥΤΟ ΤΟ ΠΑΡΑΔΕΙΓΜΑ. ΟΝΤΩΣ ΤΑ ΓΕΓΟΝΟΤΑ ΘΑ ΠΡΟΣΑΡΜΟΣΤΟΥΝ ΓΥΡΩ ΑΠΟ ΤΗΝ ΕΝΕΡΓΕΙΑ ΜΟΥ. ΑΥΤΟ ΔΕΝ ΣΗΜΑΙΝΕΙ ΠΩΣ Ο ΙΟΣ ΘΑ ΥΠΑΡΞΕΙ ΑΝΑΓΚΑΣΤΙΚΑ ΚΑΙ ΤΕΛΙΚΑ ΜΕΣΩ ΕΝΑΛΛΑΚΤΙΚΩΝ ΔΙΑΔΡΟΜΩΝ, ΑΥΤΟ ΣΗΜΑΙΝΕΙ ΠΩΣ Η ΜΝΗΜΗ ΤΟΥ ΙΟΥ ΣΤΟ ΣΥΛΛΟΓΙΚΟ ΑΣΥΝΕΙΔΗΤΟ ΤΟΥ ΚΟΣΜΟΥ ΜΕΤΑ ΤΗΝ ΕΝΕΡΓΕΙΑ ΜΟΥ ΝΑ ΤΟΝ ΑΠΑΛΕΙΨΩ ΔΕΝ ΘΑ ΤΟΝ ΠΕΡΙΛΑΜΒΑΝΕΙ, ΟΥΤΕ ΤΑ ΓΕΓΟΝΟΤΑ ΠΟΥ ΟΔΗΓΗΣΑΝ ΣΤΗΝ ΕΞΑΠΛΩΣΗ ΤΟΥ.
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