Twins are born at t > 0 based on the clock within the hospital room of a hospital located in a one dimensional metropolis inside a one dimensional state on a planet situated on the outskirts of a one dimensional galaxy. The handle is x > 0. The delivery is labeled by the docs as occasion A. They work in a slim constructing with exit doorways each on the left and on the appropriate. The twins, one inexperienced, the opposite blue, by no means get alongside. Their distaste for one another is marked by their delivery. To most successfully push one another away, their physician prescribes momentum conservation to make sure they by no means see one another once more.
The twins stay hooked up to the physician who delivered them and efficiently be in contact at common intervals of time. As a result of the physician works lengthy hours, she lives for probably the most half on a vertical path, with solely slight deviations left and proper relying on whether or not she goes procuring, to a restaurant, or again residence. The messages she receives from the twins recommend to her that each are concurrently thriving, however not everybody agrees. The twins retain affection for his or her father although even earlier than the time of their delivery, he was already miles away on the appropriate, on an accelerated purple path that will take him as removed from the twins as doable. They ship the identical data to their father who receives them through the blue and inexperienced indicators at occasions B and C, as they do to their physician.
Their communication is about to be hampered by a darkish object lurking on the horizon, intent on absorbing all data. This object is created by the daddy and his proper to view the world from his personal perspective. As a result of he’s compelled to stay a minimum of partly in the true world, he travels slower than mild, and the blue and inexperienced mild messages meet up with him a minimum of initially, though not at common intervals as they do for the physician. The messages from the blue twin arrive after more and more lengthy intervals and the photographs he receives appear to recommend that progress in life has slowed down dramatically and virtually stalled. Blue twin seems to be falling right into a bottomless pit. The daddy is sorry about this however has hope that each one it will quickly evaporate. From the daddy’s perspective, communication with blue twin ends on the dashed crimson line, after which no additional occasions are registered, and the final nugget of data from blue twin arrives 50 years after delivery and exhibits blue twin to be 25 years previous. Inexperienced twin continues to replace dad with more moderen photographs and pa concludes that blue twin is in a center age disaster.
Ultimately dad tires of working away from his issues and settles right down to a less complicated life on a vertical path, and to his delight begins getting commonly timed messages from each twins, indicating each have resumed their lives and are doing properly, and realizes that his impressions had little to do with the experiences of the twins. His worries and the occasion horizon each evaporate as all ends properly.
