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Originally Posted by Eta C
The equivalence is between an accelerated reference frame and a gravitational field, not between the two twins. The principle of equivalence is one of the foundations of general relativity. It states that the laws of physics are the same in an accelerated reference frame as they are in a gravitational field. That's why one way of providing "artificial" gravity in a spacecraft is to continuously accelerate.
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The original post said "By GR’s Principle of Equivalence, these two accelerations are indistinguishable and produce identical effects. " But the two accelerations are not indistinguishable, are they? Twin 1 is comforable, experiencing the earth's 1G as he sits on the beach sipping Pina Colada. In the meantime, twin 2 is being thrown from one end of his space ship to the other as the outbound rockets extingush and the inbound rockets ignite to change the spacecrafts direction back towards the earth.