Redemption Ark

[It isn’t really a vacuum, not at the quantum level. It’s a seething foam of rich interactions: a broiling sea of fluctuations, with particles and messenger-particles in constant existential flux, like glints of sunlight on ocean waves. It’s the choppiness of that sea which creates inertial mass, not matter itself. The trick is to find a way to modify the properties of the quantum vacuum — to reduce or increase the energy density of the electromagnetic zero-point flux. To calm the sea, if only in a locally defined volume.]

Remontoire sat down. I’ll stop here, if you don’t mind.

‘I don’t feel well either,’ Felka said, squatting down next to him. ‘I feel sick and light-headed.’

The servitor turned around stiffly, animated like a haunted suit of armour. [You’re experiencing the physiological effects of the field. Our inertial mass has dropped to about half its normal value. Your inner ear will be confused by the drop in inertia of the fluid in your semi-circular canal. Your heart will beat faster: it evolved to pump a volume of blood with an inertial mass of five per cent of your body; now it has only half that amount to overcome, and its own cardiac muscle reacts more swiftly to the electrical impulses from your nerves. If we were to go much deeper, your heart would start fibrillating. You would die without mechanical intervention.]

Remontoire grinned at the armoured servitor. Fine for you, then.

[It wouldn’t be comfortable for me, either, I assure you.]

So what does the machine do? Does all the matter within the bubble have zero inertia?

[No, not in the present operating mode. The radial effectiveness of the damping depends on the mode in which we’re running the device. At the moment we’re in an inverse square field, which means that the inertial damping becomes four times more efficient every time we halve our distance to the machine; it becomes near infinite in the immediate proximity of the machine, but the inertial mass never drops to absolute zero. Not in this mode.]

But there are other modes?

[Yes: other states, we call them, but they’re all very much less stable than the present one.] She paused, eyeing Remontoire. [You look ill. Shall we return upship?]

I’ll be fine for now. Tell me more about your magic box.

Skade smiled, as stiffly as usual, but with what looked to Remontoire like pride. [Our first breakthrough was in the opposite direction — creating a region of enhanced quantum vacuum fluctuation, thereby increasing the energy-momentum flux. We call that state one. The effect was a zone of hyper-inertia: a bubble in which all motion ceased. It was unstable, and we never managed to magnify the field to macroscopic scales, but there were fruitful avenues for future research. If we could freeze motion by ramping inertia up by many orders of magnitude we’d have a stasis field, or perhaps an impenetrable defensive barrier. But cooling — state two — turned out to be technically simpler. The pieces almost fell into place.]

I’ll bet they did.

Is there a third state?‘ Felka asked.

[State three is a singularity in our calculations that we don’t expect to be physically realisable. All inertial mass vanishes. All matter in a state-three bubble would become photonic: pure light. We don’t expect that to happen; at the very least it would imply a massive local violation of the law of conservation of quantum spin.]

‘And beyond that — on the other side of the singularity? Is there a state four?’

[Now we’re getting ahead of ourselves, I think. We’ve explored the properties of the device in a well-understood parameter space, but there’s no point in indulging in wild speculation.]

How much testing, exactly?

[Nightshade was chosen to be the prototype: the first ship to be equipped with inertia-suppression machinery. I ran some tests during the earlier flight, dropping the inertia by a measurable amount — enough to alter our fuel consumption and verify the effectiveness of the field, but not enough to draw attention.]

And now?