4 ms·
No OP is correct, her use of the term CTC is not what is usually meant. The curve she draws is not timelike along the faster than light segments in the sense of
by superposeur 4y ago
No OP is correct, her use of the term CTC is not what is usually meant. The curve she draws is not timelike along the faster than light segments in the sense of having tangent 4-vector with timelike norm with respect to the underlying metric. She would not disagree I think.