where is time going? some novel clues from quantum mechanics and relativity presented in “the...
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Where is Time Going? Some Novel Clues from Quantum Mechanics and Relativity
Presented in “The Forgotten Present: A Quest for a Richer Concept of Time,”Munich-Pullach, Germany, April 29th - May 2nd, 2010.
Avshalom C. Elitzur
Outline
1. Time’s Passage: Apparent? Real?
2. Quantum Clues
3. Relativistic Clues
4. The Model
© Everyone 2010Permission is granted to everyone to copy and/or use this work or any part of it.
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Outline1. Time’s Passage: Apparent? Real?
2. Quantum Clues
3. Relativistic Clues
4. The Model
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Time: The Common ViewEvents Become and Go, One by One
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Time: The Relativistic ViewAll Events Coexist along Time
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Relativistic Contraction is a Consequence of the “Coexistence” of Past and Future States
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Relativistic Contraction is a Consequence of the “Coexistence” of Past and Future States
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Relativistic Contraction is a Consequence of the “Coexistence” of Past and Future States
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Relativistic Contraction is a Consequence of the “Coexistence” of Past and Future States
x
t
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Relativistic Contraction is a Consequence of the “Coexistence” of Past and Future States
“Now”
x
t
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Relativistic Contraction is a Consequence of the “Coexistence” of Past and Future States
“Now”
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The Block Universe Account of Time
All events – past, present and future – have the same degree of existence. There is no privileged “Now.”
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Why Most Physicists Deny Becoming
1. It might entail a yet higher time (How fast does the “Now” move?) and so on to infinity of times
2. It seems to entail absolute simultaneity
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Theoretical Lavishness of Superstring Theories:• Extra spatial dimensions• Hyperspaces• Multiverse• Etc.
All within the Block Universe!
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πάντα χωρεῖ καὶ οὐδὲν μένει
Heraclitus of Ephesus (535–475 BC)Parmenides of Elea (515 - 450 BC)
Taking Side
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Outline1. Time’s Passage: Apparent? Real?
2. Quantum Clues
3. Relativistic Clues
4. The Model
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E-V Experiment
EPR Experiment
Quantum Spatial Peculiarities
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Quantum Temporal Peculiarities
Delayed Choice
HBT Experiment
Schrödinger’s cat
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Schrödinger’s Cat as a Temporal Paradox
t0: Cat and deadly machine sealed in box
t1: Lethal event occurring or not occurring
tf: Cat alive, but lean and unhappytf: Cat dead and decomposing
OR
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The Hanbury-Brown-Twiss Effect
• (HBT, 1958) Interference of two distant sources:
• Even when the sources are so weak to produce a single photon at a time!
1. Coherent light emitted by two sources
2. Light is split by the beam splitter
3. Interference
4. All light reaches the same detector
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The Hardy Atom
1. An atom is prepared to be in the state |y↑>
2. It is then split by a Stern-Gerlach Magnet into |x↓> and |x↑>
3. The two halves of the wave function are confined into boxes
4. That are transparent for photons but opaque for the atoms
5. One of the boxes is placed on one arm of an interferometer
6. Such that if the atom is in that box and if the photon passes in that arm, absorption occurs with probability 1.
7. Two Hardy atoms can be entangled into an EPR pair
|y>↑
|x>↑ |x>↓
|x↓>|x↑>
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Time-Reversed EPR(Elitzur, Dolev & Zeilinger 2001)
22112
1xixxix 2121
2
1xxxx
1. Two Hardy atoms in x-spin superposition (but not entangled)
2. “Forbidden” detector clicks
3. Where did the photon come from? Ignorance begets entanglement!
4. The atoms are entangled (i.e. violate Bell’s Inequality)
5. Giving rise to EPR with the entangling event not in the past but in the future
… or better call it: RPE
interferenceno
inter
feren
ce
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The Bell Inequality Violations
The results predicted by QM:
Measured Directions Correlation
00 00 100%
300 300 100%
…
00 -300 75%
300 00 75%
…
-300 300 25% !
300 -300 25% !
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The Quantum Liar Paradox
• To prove non-locality, test the two Hardy atoms for Bell Inequality
• Use Spin measurement in 3 directions relative to the x-axis: 00, 300, and -300
• For 00, just inspect the two boxes (“which box” measurement)
• For 300 and -300 directions, re-unite the boxes, then split according to desired direction, and finally measure position
22112
1xixxix 2121
2
1xxxx
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The Quantum Liar Paradox
• 00 direction (“which box”) measurement allows only one history for the photon
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The Quantum Liar Paradox
• 00 direction (“which box”) measurement on the left atom
• But a different direction (300, -300) measurement on the right atom
• Here too, there are Bell Inequality violations…
• Which require a non-local effect between the left and the right atoms!
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The Quantum Liar Paradox
So, you end up with the following history:
– One atom is found to have blocked the photon’s path.– Hence, it appears that it could not interact with the
other atom, – and therefore should not be entangled with it.– But, by violating Bell’s inequality, its “having blocked
the photon” was affected by the measurement of the other atom!
Which is logically equivalent to saying…
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THIS SENTENCE HAS NEVER
BEEN WRITTEN
(-:
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The Quantum Liar Paradox,Zoller & Cirac’s system
• Two excited atoms A1 and A2 reside in cavities facing a beam-splitter
• One detector clicks, source of the photon uncertain
• Thereby entangling the two atoms
• An orthogonal measurement to excited/ground is introduced
• EPR• Bell-inequality violated• The liar paradox all over again
*212*12
1AAAA
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The Quantum Liar Paradox,Zoller & Cirac’s system
– One atom is found to be excited, which seems to indicate that it emitted no photon
– Hence, it could not interact with the other atom and should not be entangled with it.
– But, by violating Bell’s inequality, its “having preserved its photon” is due to entanglement with the other atom!
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Non-Sequential Behavior of the Wave Function (Elitzur & Dolev, 2010):
321 YYY
1. Three Hardy atoms in x-spin superposition (but not entangled):
2. Photon goes through; discarding all cases where one atom absorbed the photon
3. “Forbidden” detector D clicks, hencesomething must have disturbed the photon
4. The middle atom is measured and found (56% of the cases!) to have “collapsed” into the intersecting box
5. All other atoms restore their original superposition!
D C
32124
1YΧYDΨ
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Aharonov, Y., and Rohrlich, D. (2005) Quantum Paradoxes: Quantum Theory for the Perplexed. New York: Wiley.
Properties of a Quantum System between Measurements:“Every quantum event is visited twice, once by the state vector coming from the pre-selection and then again by the vector coming backwards from the post-selection” (Aharonov, personal communication).
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Большая Советская Энциклопедия
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Outline1. Time’s Passage: Apparent? Real?
2. Quantum Clues
3. Relativistic Clues
4. The Model
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t
x
t
x
A jurisdiction overlap between SR and GR: How is spacetime formed i) near mass, and ii) at inertial motion?
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Outline1. Time’s Passage: Apparent? Real?
2. Quantum Clues
3. Relativistic Clues
4. The Model
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The Assumption of Becoming
Events are created anew, one after another, in spacetime, according to their causal order. At any moment in time which one perceives as “Now,” future events are not only unknown but objectively inexistent, to be created later as the Now “advances.”
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Becoming – The Ultimate Compactification?
It may make work just as well as extra space dimensions
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The Machian Consequence
Where there are no events, there is neither space nor time (Mach)
If there are no future events at any “Now,” there is no spacetime in the future either. Spacetime must
be “growing” in the future direction
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A Cosmological Ring
Spacetime is “preceded” and “bounded” by nothingness
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“Time and space are necessary forms of any thought and of any PowerPoint slide””
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Never spatialize time!
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Block Universe
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Naïve Becoming
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Let’s Go Quantum:
Quantum interaction takes place beyond the “Now,” hence outside of spacetime.
“Collapse” gives rise not only to the particle in its location, but to all the points in empty
space where it could have been.
The spacetime zone associated with this interaction emerges only as its
consequence.
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Becoming at the quantum level
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Special Relativity Dynamized
The speed of light/gravity is more basic than space and time
Because the gravitational/electromagnetic interaction precedes the relative positioning of events.
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General Relativity Dynamized
Mass gives rise not only to spacetime curvature but to “bumps” in the Now plane
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Less Naïve Becoming
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Consequence: The Origins of Time-Asymmetry
Becoming is the master arrow of timeWhich creates spacetime intervals between events
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Consequence: Mach Dynamized
Position, rather than being only defined by other positions, emerges due to the pre-spacetime interaction with these objects.
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Thereby, Force is Dynamized
The wave function, upon “measurement,” gives rise not only to the particles’ position and momentum but to the entire spacetime region within which it could have resided.
Hence the pre-spacetime interaction determines the distances between objects
Hence attraction and repulsion
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A Research Program:
Take all pre-big-bang scenarions and apply them to the pre-spacetime stage
of every event
E.g., Compactification as the mechanism for quantum collapse
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References
Dolev, S., & Elitzur, A.C. (2001) Non-sequential behavior of the wave-function. http://www.a-c-elitzur.co.il/site/siteArticle.asp?ar=72
Elitzur, A.C., & Dolev, S (2006) Multiple interaction-free measurement as a challenge to the transactional interpretation of quantum mechanics. In Sheehan, D. [Ed.] Frontiers of Time: Retrocausation – Experiment and Theory. AIP Conference Proceedings, 863, 27-44.
Elitzur, A.C., & Dolev, S (2007) The inexhaustible source of insights revealed by every photon. Proceedings of SPIE Volume 6664: The Nature of Light: What Are Photons?, C. Roychoudhuri, A.F. Kracklauer, & K. Creath, Eds, 666402-666413.http://a-c-elitzur.co.il/uploads/articlesdocs/photon5(2).pdf
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(Herman Minkowski, 1909)
What a pity to die at the dawn of relativity!