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Assuming a classic Twin Paradox scenario in deep space
where the outbound relative velocity has the same magnitude as
the inbound relative velocity and the period of the turnaround
acceleration is arbitrarily small (as measured by each twin) with
respect to the duration of the round trip, please answer the
following about how the net proper time difference (NPTD) accumulates
and click the Submit button.

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submission to work.

• 1) Does the NPTD accumulate primarily during the constant velocity
  segments?
  

  Yes
  No
  Indeterminable
• 2) Does the NPTD accumulate smoothly during the constant velocity
  segments? [By smoothly, we mean that if the NPTD for the outbound or
  inbound segment is X, then, for example, for each 1/10th of that
  segment, 1/10th of X accumulates.]
  

  Yes
  No
  Indeterminable
• 3) Does the NPTD accumulate primarily during the acceleration segments?
  

  Yes
  No
  Indeterminable
• 4) If Yes to 3 above, does the NPTD accumulate primarily during the
  turnaround acceleration?
  

  Yes
  No
  Indeterminable
• 5) Does half the NPTD always accumulate during the outbound segment and
  half during the inbound segment?
  

  Yes
  No
  Indeterminable
• 6) What is the primary cause of the NPTD?
  

  Special Relativity’s (SR) time dilation, as Einstein originally claimed
  SR’s Length Contraction
  Relative Simultaneity (NPTD accumulates during constant velocity legs)
  Change in Relativistic Kinetic Energy
  Relativistic Doppler Shift
  Turnaround Acceleration
  (Virtual) Gravitational Field
  Relative Simultaneity (NPTD “jumps” during turnaround acceleration)
  Kinematics or Nature of relativistic spacetime
• 7) If in question 6 above you selected Kinematics or Nature of
  relativistic spacetime, please provide the specific relativistic
  construct, characteristic or property that would distinguish this
  cause from some other theory’s spacetime related cause (e.g., a
  Preferred Frame Theory might hold that the “nature of spacetime”
  caused clocks to run slow as a function of velocity with respect to a
  special frame).
  
• 8) If you did not select any of the causes listed in question 6 above,
  please specify the cause below.
  
• 9) Does the Twin Paradox imply a special (possibly unknown) frame? (As
  Langevin and many other prominent physicists have claimed.)
  

  Yes
  No
  Indeterminable