How to Build a                          (real)                       Time Machine                                John Ashm...
Plan                              • Plot devices                              • Paradoxes                              • P...
Plot Devices                                To anyone but a                                    genius the                 ...
Going back to the Well                                       `Clearly, the Time Traveller                                 ...
• “It happened,” the                         hoarse voiceless                         gasp went on,                       ...
11/21/2008   Time travel in SFSunday, May 24, 2009                         6
Flux capacitor            11/21/2008       Time travel in SF   7Sunday, May 24, 2009                                 7
Bare essentials of time travel                           • Grandfather                             paradoxes              ...
Spreadsheet timeSunday, May 24, 2009                      9
Block universeSunday, May 24, 2009                    10
Time out for paradoxSunday, May 24, 2009                          11
Grandfather paradox            “Why pick on grandfather? It seems that the only way to          prove that time travel is ...
All You Zombies                         •! A Paradox can be                            paradoctored!                      ...
Closed timelike curves                                    Ground-hog day                                       Deju Vu    ...
Paradox noise                             "YOUR ONLY CHANCE LIES IN                                PREVENTING THE         ...
Sunday, May 24, 2009   16
Greenberger & Svozil                                   According to our model, if you                                   tr...
Entropy                       The law that entropy always increases holds, I                       think, the supreme posi...
Bootstrap paradoxes                               • An engineer goes 30 years into                                 the fut...
Tanstaafl!                            20Sunday, May 24, 2009               20
Patently absurd                                  I canna                                  chnage                          ...
Time machine                                A method for employing                                sinusoidal oscillations ...
Faster                       than light                       A propulsion system for a                       space vehicl...
Thought                       experimentsSunday, May 24, 2009                 24
CARTER-Well, I’m guessing that because time is passing more                slowly on P3W-451, relative to Earth, we’re exp...
How to build                           a time                          machine                       -- Paul DaviesSunday,...
Frame-draggingSunday, May 24, 2009                    27
Gödel’s rotating universe                       "This and similar contradictions, however, in order to                    ...
On Rotating Cylinders & the Possibility of                        Global Causality Violation                              ...
Gott got it done with two                                          strings                                   OK, cosmic st...
General relativistic time                             machines                                    ”General relativity is i...
Acme Wormhole Construction                      Company                              Visser’s recipe for a                ...
Time machines today              • A design for a quantum time machine              • The time traveller              • La...
Design for a                        quantum                          time                        machine                  ...
Practical thiotimolineSunday, May 24, 2009                            35
Withdrawal painsSunday, May 24, 2009                      36
Mallett - time traveller                                     • ring laser                                     • frame drag...
Square-                        shaped                       ring laserSunday, May 24, 2009                38
Sunday, May 24, 2009   39
Time Machine at the LHC                             I.Ya. Aref’eva and I.V. Volovich                 Recently, black hole ...
If LHC is a Mini-Time-                       Machines Factory, Can                            We Notice?         • energy ...
I have no doubt that in reality          the future will be vastly more          surprising than anything I can          i...
How to build a (real) time machine           •       The End of Time - Julian Barbour           •       How to Build a Tim...
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How to build a real time machine

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Like it says. If you missed the talk, just loop back & catch it again. Make sure to stay on your original time line or you may find yourself Lost in the Multiverse.

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  • If you fine way to go back in time i love to use device for one thinking chance my life in 2006
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  • I gave this talk at Balticon, Capclave, & Philcon (& a more scientific version at NASA). As to how to loop back to catch it, I'm still working on the practical details. :)
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  • What 'talk' are you referring to exactly? And how does one 'loop back' to catch it again?
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How to build a real time machine

  1. 1. How to Build a (real) Time Machine John AshmeadSunday, May 24, 2009 1
  2. 2. Plan • Plot devices • Paradoxes • Patents • Pthought experiments • Possible time machinesSunday, May 24, 2009 2
  3. 3. Plot Devices To anyone but a genius the problem would have been insurmountable. - Mr. PeabodySunday, May 24, 2009 3
  4. 4. Going back to the Well `Clearly, the Time Traveller proceeded, `any real body must have extension in four directions: it must have Length, Breadth, Thickness, and--Duration. But through a natural infirmity of the flesh, which I will explain to you in a moment, we incline to overlook this fact. There are really four dimensions, three which we call the three planes of Space, and a fourth, Time. There is, however, a tendency to draw an unreal distinction between the former three dimensions and the latter, because it happens that our consciousness moves intermittently in one direction along the latter from the beginning to the end of our lives.Sunday, May 24, 2009 4
  5. 5. • “It happened,” the hoarse voiceless gasp went on, “that Gyronchi was the first future world, out of those possible, that the chronoscope revealed. Happened that I found Sorainya, splendid in her armor, fencing with one of her human ants.”Sunday, May 24, 2009 5
  6. 6. 11/21/2008 Time travel in SFSunday, May 24, 2009 6
  7. 7. Flux capacitor 11/21/2008 Time travel in SF 7Sunday, May 24, 2009 7
  8. 8. Bare essentials of time travel • Grandfather paradoxes • Bootstrap paradoxes • But, whatever is not paradoxical, is permitted!Sunday, May 24, 2009 8
  9. 9. Spreadsheet timeSunday, May 24, 2009 9
  10. 10. Block universeSunday, May 24, 2009 10
  11. 11. Time out for paradoxSunday, May 24, 2009 11
  12. 12. Grandfather paradox “Why pick on grandfather? It seems that the only way to prove that time travel is impossible is to cite a case of killing ones own grandfather. This incessant murdering of harmless ancestors must stop. Lets see some wide-awake fan make up some other method of disproving the theory.” – Letter to editor at Astounding Stories (January 1933) as quoted in Nahin (Nahin 1999)Sunday, May 24, 2009 12
  13. 13. All You Zombies •! A Paradox can be paradoctored! •! “I’m My Own Grandpa” •! “I know where I come from, but where do all you zombies come from?” •! “Of course I have free will. What choice do I have?” - Irving Berlin •! (Drawing is from Kaku’s Hyperspace)Sunday, May 24, 2009 13
  14. 14. Closed timelike curves Ground-hog day Deju Vu Cause & Effect ...Sunday, May 24, 2009 14
  15. 15. Paradox noise "YOUR ONLY CHANCE LIES IN PREVENTING THE ASSASSINATION OF PRESIDENT ABRAHAM LINCOLN . . ." "What?" A burst of audio and visual static reduced reception to unintelligible noise. Then the paradox-generated interference was gone again, as suddenly as it had come.Sunday, May 24, 2009 15
  16. 16. Sunday, May 24, 2009 16
  17. 17. Greenberger & Svozil According to our model, if you travel into the past quantum mechanically, you would only see those alternatives consistent with the world you left behind you. In other words, while you are aware of the past, you cannot change it. No matter how unlikely the events are that could have led to your present circumstances, once they have actually occurred, they cannot be changed. Your trip would set up resonances that are consistent with the future that has already unfolded. 17Sunday, May 24, 2009 17
  18. 18. Entropy The law that entropy always increases holds, I think, the supreme position among the laws of nature. If someone points out to you that your pet theory of the universe is in disagreement with Maxwells equations - then so much the worse for Maxwells equations.…but if your theory is found to be against the second law of thermodynamics, I can give you no hope; there is nothing for it but to collapse in deepest humiliation. -- EddingtonSunday, May 24, 2009 18
  19. 19. Bootstrap paradoxes • An engineer goes 30 years into the future, reads some patents a later version of himself has filed, takes the (knowledge in the) patents back, and files them. When were the patents written? Even with time travel, it should not be possible to create order without paying workSunday, May 24, 2009 19
  20. 20. Tanstaafl! 20Sunday, May 24, 2009 20
  21. 21. Patently absurd I canna chnage the laws of physics.Sunday, May 24, 2009 21
  22. 22. Time machine A method for employing sinusoidal oscillations of electrical bombardment on the surface of one Kerr type singularity in close proximity to a second Kerr type singularity in such a method to take advantage of the Lense-Thirring effect...Sunday, May 24, 2009 22
  23. 23. Faster than light A propulsion system for a space vehicle is designed as a fully self-contained system which does not eject particles to effect the propulsion, referred to as a "reactionless drive". Propulsion is effected by changing the mass of rings of charged particles by acceleration of the rings of charged...Sunday, May 24, 2009 23
  24. 24. Thought experimentsSunday, May 24, 2009 24
  25. 25. CARTER-Well, I’m guessing that because time is passing more slowly on P3W-451, relative to Earth, we’re experiencing a paradox the Stargate was never designed for.Sunday, May 24, 2009 25
  26. 26. How to build a time machine -- Paul DaviesSunday, May 24, 2009 26
  27. 27. Frame-draggingSunday, May 24, 2009 27
  28. 28. Gödel’s rotating universe "This and similar contradictions, however, in order to prove the impossibility of the worlds under consideration, presuppose the actual feasibility of the journey into ones past. But the velocities which would be necessary in order to complete the voyage in a reasonable time are far beyond everything that can be expected ever to become a practical possibility." – GödelSunday, May 24, 2009 28
  29. 29. On Rotating Cylinders & the Possibility of Global Causality Violation • Niven’s Law: • “If the universe of discourse permits the possibility of time travel, and of changing the past, then no time machine will be invented in that universe.”Sunday, May 24, 2009 29
  30. 30. Gott got it done with two strings OK, cosmic strings.Sunday, May 24, 2009 30
  31. 31. General relativistic time machines ”General relativity is in fact infested with peculiar geometries that seem to produce time machines” – VisserSunday, May 24, 2009 31
  32. 32. Acme Wormhole Construction Company Visser’s recipe for a time machine: 1. Acquire a traversable wormhole 1. Induce a “time-shi.” between the two mouths of the wormhole 2. Bring the wormhole mouths togetherSunday, May 24, 2009 32
  33. 33. Time machines today • A design for a quantum time machine • The time traveller • Large Hadron Collider as time machine factory?Sunday, May 24, 2009 33
  34. 34. Design for a quantum time machine - Andrew GraySunday, May 24, 2009 34
  35. 35. Practical thiotimolineSunday, May 24, 2009 35
  36. 36. Withdrawal painsSunday, May 24, 2009 36
  37. 37. Mallett - time traveller • ring laser • frame draggingSunday, May 24, 2009 37
  38. 38. Square- shaped ring laserSunday, May 24, 2009 38
  39. 39. Sunday, May 24, 2009 39
  40. 40. Time Machine at the LHC I.Ya. Aref’eva and I.V. Volovich Recently, black hole and brane production at CERN’s Large Hadron Collider (LHC) has been widely discussed. We suggest that there is a possibility to test causality at the LHC. We argue that if the scale of quantum gravity is of the order of few TeVs, proton-proton collisions at the LHC could lead to the formation of time machines (spacetime regions with closed timelike curves) which violate causality. One model for the time machine is a traversable wormhole. We argue that the traversable wormhole production cross section at the LHC is of the same order as the cross section for the black hole production. Traversable wormholes assume violation of the null energy condition (NEC) and an exotic matter similar to the dark energy is required. Decay of the wormholes/time machines and signatures of time machine events at the LHC are discussed.Sunday, May 24, 2009 40
  41. 41. If LHC is a Mini-Time- Machines Factory, Can We Notice? • energy spectrum changes • anomalously energetic particles Mironov, Morozov, & • acceleration of particle decays Tomaras • unitarity violation • collective effectsSunday, May 24, 2009 41
  42. 42. I have no doubt that in reality the future will be vastly more surprising than anything I can imagine. Now my own suspicion is that the universe is not only queerer than we suppose, but queerer than we can suppose. – J. B. S. HaldaneSunday, May 24, 2009 42
  43. 43. How to build a (real) time machine • The End of Time - Julian Barbour • How to Build a Time Machine - Paul Davies • Time Travel in Einstein’s Universe - J. Richard Gott • Physics of the Impossible - Michio Kaku • Time Traveler - Ronald L. Mallett • Time’s Arrow & Archimedes’ Point - Huw Price • Timeless Reality - Victor J. Stenger • The New Time Travelers - David Toomey john.ashmead@timeandquantummechanics.com Balticon 2009/05/24Sunday, May 24, 2009 43
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