Talk:Time travel

message: A colleague (who didn't take the trouble to encourage constructive discussion by even saving -- for those who care who the colleague is or when they held forth -- the trouble of searching the edit history) did add to #Tourism in time the following comment markup (to which i've added meta-markup, on this talk page, trying to make the markup display in a more intuitively clear way here):
:  "This picture would explain why we haven't been over run 
:: 
: by tourists from the future."
   The colleague's concern for non-misrepresentation is praiseworthy, even tho the wording "have tried to edit" reeks too much of the Inquisition or the Klan, and the typographic travesty that is their solution may not even be appropriate for some critical edition of Hawking's works. Here -- leaving behind the pedants' concern about who (Hawking, an editor, a typesetter?) is responsible for the inappropriate internal space -- is an encyclopedia-appropriate version of the passage:
:  "This picture would explain why we haven't been [overrun] by tourists from the future."
It's literate, harmless, almost devoid of distraction, and not significantly better nor worse than
: Stephen Hawking says that this picture would explain why our times haven't been overrun by "tourists from the future."
--Jerzy•t 04:21 & 07:05, 3 February 2015 (UTC)
thread_title:  replacement for wretched wording and markup 

message: According to Ramayana which writeen thousands of years ago  kakbhisundi was creature who can time travel 2409:4042:4E91:7CE0:0:0:600A:9F00 (talk) 06:14, 15 November 2023 (UTC)
replies: text: If you can find a review article or book that summarizes the time travel of this creature, then please add a paragraph with the reference to the article under "In culture". Johnjbarton (talk) 15:37, 15 November 2023 (UTC)
replies: text: Add to the section "Mythical time travel" Johnjbarton (talk) 18:03, 15 November 2023 (UTC)
thread_title:  Time travel is first in Hindu mythology  

message: Throughout this article various physical models are discussed which have time parameters moving forward or backward. The discussion in the article around these models pushes the idea that such parameter values amount to "time travel". Do these physical models allow the motion of one selected rigid body in "time" while the remainder of the universe does not follow? That is "time travel", not t= t_0-t'. Johnjbarton (talk) 16:33, 14 February 2024 (UTC)
thread_title:  Article stretch's physics jargon to favor pop culture ideas.  

message: FIRST TRAVELLER THROUGH TIME 
raM Pyramid of Universe 
Billirams RaM King RaM PYRAMID Al HARAM BY RaM Id 156.202.111.148 (talk) 02:01, 15 April 2024 (UTC)
replies: text: Not done: it's not clear what changes you want to be made. Please mention the specific changes in a "change X to Y" format and provide a reliable source if appropriate. User:CanonNi (talk|contribs) 02:04, 15 April 2024 (UTC)
thread_title:  Semi-protected edit request on 15 April 2024 

message: Hi, looked into this a while back.
One of the arguments against time travel is the "Chronology Protection Conjecture" (S W Hawking) also known as 'Niven's law of conservation of history' and an older variant being the 'Novikov self-consistency principle' where either paradoxes are a physical impossibility, the Universe prevents them being observed in real space and time eg by event horizons or any backwards time travel only observes and not changes the past and any changes made are random chance only. The current research appears to be suggesting that superluminal particles like tachyons may "drag" very light normal matter into FTL which would in fact not invalidate the laws we already know, as that energy exchange cancels itself out at a short distance from the source purported to be cosmological likely a Blitzar.
Pair production in black holes (Hawking radiation) seems to be a way to experimentally test this, and Feynman was the physicist who first suggested that one way to model antimatter is regular matter moving back in time to the moment of its annihilation.
Generating an artificial event horizon in superconductors of a specific internal geometry bombarded with gamma rays at a specific energy range tuned to the elements used seems possible and I am actually looking into this possibility. 91.190.161.160 (talk) 05:30, 25 May 2024 (UTC)
replies: text: Please let us know when you have some  reliable references. Johnjbarton (talk) 15:13, 25 May 2024 (UTC)
thread_title:  Theoretical physics