Phase 1: Rindler / Schild's Ladder
The universe was wide and open, with too many inhabited planets for anyone to ever see. Even should you visit one each minute—to what degree you could visit
anything in merely a minute—you'd find they were being colonised almost faster than you could get to them. Still, there were some places everyone wanted to drop by.
Earth was one of them. The
Rindler, for a very different reason, was another.
"Freeeeeee-dom!" Liliana bounced across the phase space of her 'scape, quickly upshifting from ten dimensions to a hundred, then a thousand, then enough that she stopped being aware of them as directions, instead seeing them as the gestalt properties they were. She stopped existing at just a single location, her mind taking a dozen branches both ways so she could explore the entirety of the Rindler all at once.
Her exoself gamely kept track, transmitting what it saw as her
maximally probable location to her brother's, until they mutually gave up and rendered her as a fog filling up the station. Nina, well familiar with his sister's antics, merely shook his head.
Their father remained a greyed-out statue, and would for another fifteen minutes at the thousand-to-one time acceleration that was standard in the Rindler
.
"—neener neener." Liliana coalesced for just long enough to stick her tongue out at their father, then disappeared on him again.
She could be really immature, he thought.
"I'm sure the place hasn't changed that much," he pragmatically told the air. "We were only eight light-months away, we're only sixteen months out of date. So are you going to stop bouncing around and help me with this prank, or what?"
"But it's neat! They did it! They actually did it!"
Liliana grabbed hold of his inputs for a second, twisting him around to face the novo-vacuum's surface, then wavered into existence in front of him with a wide smile on her face.
"Very impressive, but…"
Machinery stretching for light-seconds in every direction. Visible machinery, macroscopic machinery, machinery keeping pace with the surface and obviously
not brought here by rocket. The meta tags told him there were multiple solar systems' worth of mass.
"
Ninaaaa~"
Another poke at his exoself, automatic acceptance, and this time his consciousness was delicately prodded towards a particular set of those tags, carrying a library reference. He lost himself in them for half a second, fascinated despite himself at what they contained.
"A mixture of far-side physics, direct Sarumpaet translation and Kagutsuchian emulation?"
"Mm-hmm." Liliana grinned. "And
that's just what they did to test the theory. Imagine what it's like further in! I'm so glad we came."
"I could tell." He smiled, taking any sting out of the words.
"…what's that?"
Liliana pointed at a speck of darkness spreading across the surface, where the normal border-light had fallen off by a factor of, as far as the station's sensors could tell, infinity. She narrowed her eyes uncertainly—well, that was how Nina's exoself chose to portray her uncertainty, his sister didn't usually bother having a body—then blurred away to check the library, and—in Nina's eyes—shrugged when it failed to yield answers.
"Censoring, right?"
"Mm. Probably," she agreed. "I guess we'll find out when we go. I'd ask someone, but—"
"You'd make a nuisance of yourself, and Dad will be awake in ten minutes." Nina gave the spreading black spot a final glance, then looked away. "I'm sure this is just someone's idea of a surprise. Which isn't an excuse at all for
forgetting the plan—let's get a move on! What do you think, can we be twins this time?"
"We already are, you hair-brained lump of historical references." Liliana grinned, his exoself's translation of her broadcasted 'no hard feelings, I'm just teasing' metadata. "But, sure. Open sesame?"
Ten minutes later, when their father woke up, it was to the bemusing sight of two perfectly identical—and identical-acting—twelve year old agender children. His initial, casual attempt at resolving the confusion by checking their personal IDs, was foiled by both of them echoing the same one.
This was nothing special. The citizens of Earth had always been more liberal than average, and they'd subjected him to this 'prank' at practically every stop-over since leaving the doomed planet. By now, he wasn't sure if even
they remembered who was who.
It wasn't until hours later that the twins split up again, if not along quite the same fracture lines as before.
Kusnanto Sarumpaet had lived on Earth at the turn of the third millennium, when a group of physicists and mathematicians—now universally known as the
Sultans of Spin—had produced the first viable theory unifying gravity and quantum mechanics, spin network physics, a theory of physics where geometry was generalised based on the quantum-mechanical path each particle took through space.
Sarumpaet had generalised and simplified that theory, removing the notion of
space and replacing it with a graph—an abstract, quantum-mechanical system of nodes and connections—that did nothing
but connect. This theory had been exceedingly successful, and by the time it was fully developed it had accomplished the never-before known feat of explaining absolutely everything there was to explain about fundamental physics.
Sarumpaet's physics was a true theory of everything, leaving no room for magic. The universe had once begun, with a low-entropy, flat graph that enforced the direction of time, and some day the universe would end, in darkness and heat death. In between, creation: Nucleosynthesis, black holes, stars, galaxies and life—though humanity had never discovered aliens smarter than fungus.
In a way, it was the end of an era. In another, it was the start of something new, and humanity took their role as caretakers of the cosmos with a certainty and carefulness that would have astonished visitors from the far off pre-industrial societies of the second millennium. Despite a few close calls, they even did so without losing their humanity.
And then, at the edge of the fifth millennium, the Sarumpaet rules faced their most stringent test to date. A machine the size of a nation, built over multiple centuries in the midst of interstellar space; an isolation chamber so complete, the walls incorporated black holes for the purpose of cancelling out gravity waves. The Quietener, created to recreate the Sarumpaet rules' most perfect, idealised form, purely for the purpose of research.
They used it to
test a degenerate case: an alternate possibility for physics, a theoretical universe that—even should it have existed—would have decayed in a fraction of a second to become the one they lived in.
It was simply a pity they were wrong.
That, however, wasn't the end. Although many forms of vacuum collapse would have flashed through the vacuum at light-speed, their own universe—
nearly stable—merely succumbed to the novo-vacuum at half that rate, giving time for evacuation. Had that been otherwise, then no-one would ever have seen their end coming.
The
Rindler was originally a research station, built at the edge of the novo-vacuum with the resources of multiple star systems, all of them destroyed before it was finished. It kept pace with its expanding surface, it supported the researchers striving to stop it, and eventually it became the cornerstone of an effort to colonise it.
The universe they were from was inhospitable, permitting no means of cheating lightspeed and coming with a built-in expiration date; they hoped the one they'd created would be better. Certainly, it was far more efficient—time ran at a million times the speed, inside, and thought was proportionally cheaper—but there were hints that conservation of information itself might not be inescapable.
In any case it was populated, which rendered the notion of destroying it unthinkable.
Not since the late 22nd century had anyone died involuntarily in human space.