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# The Twin Paradox - PowerPoint PPT Presentation

The Twin Paradox/ How To Win The Debate. The Twin Paradox: Brief Background. Einstein derives symmetric time dilation “Therefore”, if two clocks start together and one makes a round trip, a net proper time difference (NPTD) will result

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Presentation Transcript

### The Twin Paradox/How To WinThe Debate

• Einstein derives symmetric time dilation

• “Therefore”, if two clocks start together and one makes a round trip, a net proper time difference (NPTD) will result

• Quickly led to the “Clock Paradox” - How Does One Get An Asymmetric Effect From Symmetric Causes?

• Mainstream: “There is no paradox or problem”

• Wikipedia Echoes That View: I tried to enter one line in Twin Paradox article about Dingle and was “burned at the stake”

• Mainstream: Accepts a wide variety of “reconciliation arguments” (RAs) – many of which are mutually exclusive

• Post Dingle: Papers rebutting any of these RAs are explicitly banned from mainstream journals

• 1-On-1 debates with professors are unsatisfactory

• Confident in their position even if they were backed into a corner, they resort to “You don’t understand SRT”

New Technique For Debating Twin Paradox explicitly banned from mainstream journals

• Get opponent to convince himself by his own statements

• For each class of RA, get opponent to answer specific, non-controversial questions up front

• Keep opponent from mixing “observed time” with “proper time” - limit discussion to “pairs of events” and the “associated proper time” – Don’t compare traveler’s proper time to Stay-At-Home’s clockreadings

RA # 1: NPTD Accumulates During Constant Velocity Segments each segment of the “

• Cause is relative velocity or relative simultaneity which are symmetric

• Mixes Observed Time with Proper Time

• Unconscious Assumption that Starting Frame is Unique Frame

Key Up Front Points each segment of the “

• 1/2 the NPTD accumulates in outbound and 1/2 in inbound

• The NPTD accumulates smoothly

• All clocks in a frame tick at the same rate

• If a clock accumulates a NPTD versus one clock in another frame, then it also accumulates the same NPTD versus all other clocks in that other inertial frame

Sample Scenario each segment of the “

• V = 0.866c, time dilation factor = ½

• Stay-At-Home 200,000,000,000 “ticks”

• Traveler 50,000,000,000 out & in

• Periods of acceleration made arbitrarily small wrt constant velocity segments

Twin Paradox Scenario Events each segment of the “

E1-E2 (Traveler’s outbound trip) E3

V--------------------------------------------------------------V

S(Stay-At-Home remains at rest ) E4

V--------------------------------------------------------------V

E7-E6 (Traveler’s inbound trip) E5

Argument each segment of the “

• Agreeing that NPTD accumulates equally and smoothly for constant velocity segments implies that the clock in the T-out frame loses proper time vs all clocks in S for all of E2-E3

• However, if one adds a 2nd Twin Paradox scenario where T-out now also plays the role of the stay-at-home twin and the “new traveling triplet” is at rest in S during the outbound leg and the whole 2nd scenario begins at E2 and ends at E3, then RA #1 leads to a contradictory conclusion that the T-out clock gains vs all clocks in S for part of E2-E3

Optional Argument each segment of the “

• Replace initial acceleration (E1-E2) with arbitrarily near miss

• Then for the outbound constant velocity segment, the time dilation effect occurs before one determines who will be the traveling twin!?!

RA # 2: NPTD Accumulates During Turnaround Acceleration each segment of the “

• Cause is asymmetric, turnaround acceleration, changing frames, virtual gravitational field, or rel. simultaneity

• NPTD calculations use distance of separation between twins at turnaround

Key Up Front Points each segment of the “

• 1/2 the NPTD accumulates in E3-E4 and 1/2 in E4-E5

• All clocks in a frame tick at the same rate

• If a clock accumulates a NPTD versus one clock in another frame, then it also accumulates the same NPTD versus all other clocks in that other inertial frame

Argument – Fill In Table each segment of the “

Optional Argument each segment of the “

• Add a 2nd scenario, also starting in S with T accelerating to 0.866c, but have 1/10th the duration and arrange it so the turnaround for both scenarios will be at virtually the same place and time

RA #3: Minkowski Spacetime, Invariance of the Interval each segment of the “

• RA #3 is really RA #1 – it’s just the relative velocity argument in disguise

• SRT’s Time Dilation Equation is used with an implied meaning that’s compatible with LAT not SRT

• Mixes Observed Time and Proper Time

Notes each segment of the “

• Designed Experiment Where Traveling Twin Gains Proper Time

### Part – II each segment of the “Implications For SRT – Observations From A Long Odyssey

Thoughts From My Odyssey each segment of the “

• Physical, Asymmetric Time Dilation As A Function of Velocity WRT A Unique Frame Is The Only Viable Cause For the NPTD

• Tried To Derive Alternative to SRT And (unknowingly) Derived LAT-like (w/o ether) -Called it ESRT

• LAT-like physical spacetime model underlies SRT’s observed spacetime models

SRT & LAT Predict Same Results each segment of the “

• In the Twin Paradox, no matter what frame is used as the starting frame, relative velocity predicts same NPTD as LAT’s absolute velocity

• For a Wide Range of Phenomena, SRT and LAT predict same results

• Tried To Define Experiment Where “LAT” Was Right vs SRT – Very Difficult- [An Exception Selleri’s Sagnac Experiment]

Same Results For Kinematics each segment of the “

• For LAT/ESRT, the concept of absolute kinetic energy is used

• In a collision, the total amount of absolute kinetic energy may differ from total amount of relative kinetic energy, but conservation laws make it so that the amount of available energy for particle creation is the same

Machian View each segment of the “

• LAT time dilation a function of difference in absolute kinetic energy

• Same phenomenon as GRT time dilation as a function of difference in grav. pot.

• Absolute kinetic energy is f(Absolute Motion wrt mass/energy configuration)

Modified SRT each segment of the “

• Remove Last Three Paragraphs of Einstein’s 1905 SRT paper – most paradoxes/problems disappear as they are now outside the domain of SRT

• 2nd Postulate becomes: The speed of light is observed to be c by all inertial observers

Modified SRT each segment of the “

• 1st Postulate becomes: The mathematical form of the laws of physics for observations are invariant in all inertial systems

• [Interestingly, for LAT/ESRT, the mathematical form remains the same, but the meaning changes]

Lorentz Geometry (LG) each segment of the “

• LG can describe SRT view where each observer observes himself to be in the unique frame where all other frames seem to have slower clocks and shorter (in the direction of motion) meter sticks

• Alternatively, LG can describe LAT view of there being a unique frame where all other frames actually have slower clocks, etc.

My Conclusion each segment of the “

• (Modified) SRT & LAT-Like Theory Both Correct – But Cover Different Domains

• LAT describes physical spacetime which is “obscured” – can’t even tell which is the unique frame

• SRT describes how each observer observes spacetime & is derivable from LAT/ESRT

Prokhovnik, Builder, Frankl each segment of the “

• Some “Otherwise” Respected Physicists Have Come To Similar Conclusions

• Frankl starts with classical Doppler Effect as f(velocities wrt medium) and uses Relativity’s “Addition of (observed) Velocities” to derive relativistic Doppler Effect for 2D (Am. J. Phys, 52(4), April 1984)

How has the Debate Been Handled? each segment of the “

• NPA is to SRT as physics comm. is to LAT (Not in Video Conferences, but in email discussions, etc.)

• All anti-SRT attacks accepted, all defenses automatically rejected

• Principle 9: There is not a shred of evidence even claimed to exist as confirmation of the reciprocity feature of SR – Really???????

E.G., Dividing By Zero each segment of the “

• Work Formula NOT key to deriving SRT each segment of the “

• Not dividing by zero since, in SRT, v can’t equal c

• Even if v could equal c that does not automatically invalidate whole theory, but just for that special case

Something To Think About each segment of the “

• At the very least, SRT So Often Gives The Right Answer It Must Point to Some Very Significant Property of Spacetime

• Being Dismissive Blinds One to that Clue

• Easier To Sell To Mainstream

References each segment of the “

• AN ASYMMETRIC MODEL OF SPACE-TIME BUILT ON LORENTZ GEOMETRY AND THE RESULTING EXTENSIONS OF SPECIAL RELATIVITY (Physics Essays Vol 7 #2 , 1994)

• A FULL UNDERSTANDING OF THE TWIN PARADOX REQUIRES AN EXTENSION OF SPECIAL RELATIVITY:  The Twin Paradox Analyzed Using Two Different Space-Time Models (Physics Essays Vol 8 #1 , 1995)

• Special Relativity: “Inconsistent” Or Just “Incomplete” (A Reply To McCausland’s Reply) (Physics Essays Vol 11 #1 , 1998)

• The Extension of Special Relativity: Algebraic Equivalence For Observations Plus A New Prediction" (Physics Essays Vol 12 #4 , 1999)

• Correcting The Flaw In Special Relativity That Leads To The Twin Paradox – Reflections on a Debate With I. J. Good And I. McCausland(Physics Essays Vol 13 #4 , 2000)