| 31. | In the presence of gravity, spacetime is non-Euclidean, or curved, and in curved spacetime straight world lines may not exist.
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| 32. | A visual novel named Steins; Gate, produced by 5pb ., tells a story based on the shifting of world lines.
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| 33. | In the language of spacetime, this is equivalent to saying that such test particles move along straight world lines in spacetime.
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| 34. | However, RintarM realizes that by doing so, he would have to return to a world line in which Kurisu is dead.
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| 35. | California orchards are filled with all sorts of varieties of fruit trees, and spices from around the world line supermarket shelves.
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| 36. | But his first choice as editor turned out to be lying about jetting around the world lining up investments and partners.
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| 37. | He proved that on a world line close to the time line, space behaves as if it were a Euclidean space.
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| 38. | We find the world line that lies on the surface of the sphere of radius r by varying the metric tensor.
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| 39. | The hypothetical tachyons ( which would violate causality ) always travel on spacelike world lines ( never within the light cone ).
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| 40. | The momentarily co-moving inertial frames along the trajectory ( " world line " ) of a rapidly accelerating observer ( center ).
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