Salvador
RF's Swedenborgian
Yes, I know that there are aliens but I do have to wonder how many come from other planets and how many come from our future? We can already send an atom back in time one second. What will we be able to do in 1,000 years? We will be able to send people back to our current time period. So,how do we know the difference between the two and other things?
"The backwards-in-time point of view is nowadays accepted as completely equivalent to other pictures, but it doesn't have anything to do with the macroscopic terms "cause" and "effect", which do not appear in a microscopic physical description.."
Villata, M. (30 November 2011). "Reply to "Comment to a paper of M. Villata on antigravity"". Astrophysics and Space Science. 337 (1): 15–17. arXiv:1109.1201. Bibcode:2012Ap&SS.337...15V. doi:10.1007/s10509-011-0940-2.
"Retrocausality is sometimes associated with the nonlocal correlations that generically arise from quantum entanglement, including for example the delayed choice quantum eraser."
Rave, M. J. (22 October 2008). "Interpreting Quantum Interference Using a Berry's Phase-like Quantity". Foundations of Physics. 38 (12): 1073–1081. Bibcode:2008FoPh...38.1073R. doi:10.1007/s10701-008-9252-y
Wharton, William R. (1998-10-28). "Backward Causation and the EPR Paradox". Retrieved 2007-06-21.
"However accounts of quantum entanglement can be given which do not involve retrocausality. They treat the experiments demonstrating these correlations as being described from different reference frames that disagree on which measurement is a "cause" versus an "effect", as necessary to be consistent with special relativity."
Costa de Beauregard, Olivier (1977). "Time Symmetry and the Einstein Paradox"(PDF). Il Nuovo Cimento (42B).
David Ellerman (2012-12-11). "A Common Fallacy in Quantum Mechanics: Why Delayed Choice Experiments do NOT imply Retrocausality". Archived from the original on 2013-06-15. Retrieved 2017-05-12.
"That is to say, the choice of which event is the cause and which the effect is not absolute but is relative to the observer. The description of such nonlocal quantum entanglements can be described in a way that is free of retrocausality if the states of the system are considered."
Rubin, Mark A. (2001). "Locality in the Everett Interpretation of Heisenberg-Picture Quantum Mechanics". Found. Phys. Lett. (). 14 (2001): 301–322. arXiv:quant-ph/0103079. Bibcode:2001quant.ph..3079R.
"Physicist John G. Cramer has explored various proposed methods for nonlocal or retrocausal quantum communication and found them all flawed and, consistent with the no communication theorem, unable to transmit nonlocal signals."
J. G. Cramer (April 2014), "Status of Nonlocal Quantum Communication Test" (PDF), UW CENPA Annual Report 2013-14, Article 7.1, retrieved September 21, 2016
Even if retrocausality exists as a quantum level, it cannot be used for communication because verifying any nonl-local correlation requires ordinary sub-luminal communication between observers at the source and destination: the no communication theorem prevents the super-luminal transfer of information. Fundamental descriptions of matter and forces require the full framework of quantum field theory in which space like-separated operators commute.