Timelike Infinity
2000 years in the future, the solar system has fallen under the domination of an alien species, the Quax. But into this world appears a spaceship launched over 1500 years ago, intended to establish a link through which time travel is possible. To the humans this is a chance to reverse time.
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- This leads us to Winger's cat (see https://en.wikipedia.org/wiki/Wigner%27s_friend ). In the novel Timelike Infinity (great series btw), the Ultimate Observer is claimed to be the consciousness at the end of universe that collapses all entangled wave functions. Note the word "entangled" ... like a ball of yarn. The ultimate observer is a cat with a cosmic ball of yarn tracing back the histories of every particle.
Wave function collapse isn't caused by an observer, but rather "does the cat care about this?"
- Stephen Baxter's books are along the same lines, start with one of these:
- A similar process is used in "Timelike Infinity" by Stephen Baxter.
https://www.wikiwand.com/en/Timelike_Infinity
His work generally uses this kind of extreme physics as plot devices and he's one of the best hard sf authors for this type of physics exploration.
- The Xeelee Sequence books (Vacuum Diagrams, Raft, Timelike Infinity etc) or The Manifold Series, all by Stephen Baxter
- This is the scenario the author Stephen Baxter used in the book Timelike Infinity.
Wormhole technology on a ship sent in a relativistic journey circling the solar system, used to bootstrap humanity and influence it in the past.
There is a catch, this sort of time travel like many others only allows one to go back as far as the creation of the wormhole. Sort of like in Primer, it isn't a general form of time travel. You can take the wormhole forward, or from the other end backwards, but not prior to the time it was created.
