From: sylvia@not.at.this.address   
      
   n 5/08/2017 4:36 PM, LuigiFortunati wrote:   
   > Mike Fontenot alle ore 08:47:53 del 04/08/2017 ha scritto:   
   >> Assuming that the traveler instantaneously accelerates to gamma = 8,   
   >> the clock at S will read 40 years when T reaches there at age 5 years.   
   >> But T says that the home twin is only 5/8 years old then.  (As soon as T   
   >> accelerates to gamma = 8, he will no longer regard the clock at S to be   
   >> synchronized with the home twin's age.  He says that the clock at S   
   >> reads (40 - 5/8) once he has reached gamma = 8.  I.e., he says that the   
   >> clock at S suddenly changes from reading zero to reading (40 - 5/8)   
   >> years when he accelerates (instantaneously) from gamma = 0 to gamma =   
   8.)   
   >>   
   >> Likewise, if T instantaneously reverses course, and goes back to the   
   >> stay-at-home twin at gamma = 8, he will conclude that she only ages 5/8   
   >> year during the constant-speed portion of his trip back.   
   >>   
   >> The important question is this: if the home twin only ages 5/8 year   
   >> during each of the two constant speed portions of T's trip (a total of   
   >> 10/8 years), how can she be much older (80 years older than T's 10   
   >> years) when he returns (as we know she must be)?   
   >>   
   >> The answer is that, during the instantaneous turnaround of T, he   
   >> concludes that her age instantaneously increases by (80 - 10/8)   
   >> years. THAT is the important resolution of the twin "paradox".   
   >   
   > Yes, this brilliant solution to the paradox tells us that in 10 years of   
   > travel (of the traveling twin) the earthly brother ages only one year   
   > and little more (1.25) while the two accelerations are enough to make it   
   > instantaneously almost 79 years old!   
   >       Accelerations are just lethal!   
   >   
      
   The acceleration is performed by the travelling twin. The apparent aging   
   occurs to the Earth twin, many light-years away. It would be surprising   
   if this were a causal effect.   
      
   Instead, the acceleration just changes the travelling twin's frame, so   
   as to allow the calculations to be done correctly. It doesn't do   
   anything to the Earth twin.   
      
   Sylvia.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)