Does space time remember

Does space-time remember?

The search for gravitational memory (archive) The calculations revealed that particles vibrated by gravitational waves don’t return to their original locations. Instead, their positions are shifted by a minuscule amount. This happens because space-time, which combines the three dimensions of space with one of time into a four-dimensional fabric, is permanently stretched in one direction and squeezed in another by the gravitational wave. These calculations showed that it was possible to find gravitational memory by combining data from LIGO and the Virgo detector in Italy.

In dense aether model gravity effect can get separated from dark matter effect, which would mean during fast changes of object mass or location the dark matter effect would be more delayed than gravity field. Because dark matter effect depend also on constellation of surrounding bodies, not just gravitating body itself.

In addition the space-time effects induced by energy of Coulombic or magnetic field should significantly lag behind its gravitational energy effects. In case of boson condensates and/or superconductors (where these fields propagate particularly slowly) this lag should be easily measurable and utilizable for practical purposes (antigravity drives and reactionless thrusters).

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The Universe Remembers Gravitational Waves — And We Can Find Them

By Paul Sutter
published December 06, 2019

Scientists are on the verge of being able to detect the "memory" left behind by gravitational waves.

Gravitational waves slosh throughout the universe as ripples in space-time produced by some of the most cataclysmic events possible.

With facilities like the Laser Interferometer Gravitational-Wave Observatory(LIGO) and Virgo, we can now detect the strongest of those ripples as they wash over the Earth. But gravitational waves leave behind a memory — a permanent bend in space-time — as they pass through, and we are now on the verge of being able to detect that too, allowing us to push our understanding of gravity to the limits.

Despite the fact that it's over a century old, Einstein's theory of general relativityis our current understanding of how gravity operates. In this view, space and time are merged together into a unified framework known as (no surprises here) space-time. This space-time isn't just a fixed stage but bends and flexes in response to the presence of matter and energy.

That bending, warping and flexing of space-time then goes on to tell matter how to move. In general relativity, everything from bits of light to speeding bullets to blasting spaceships want to travel in straight lines. But the space-time around them is warped, forcing them all to follow curved trajectories — like trying to cross a mountain pass in a straight line, but following the peaks and valleys of the topography.

What we call "gravity" is then the result of all that warping of space-time, and the fact that moving objects have no choice but to follow the curves and undulations of space-time around it.

And like any other flexible surface, space-time doesn't just bend and flex; it also vibrates.

If you stand on a trampoline, you'll bend the trampoline down. If anyone tries to walk on the trampoline near you, they will feel your "gravity" and be forced to follow a curving path. But far enough away from you, they won't even notice your gravitational influence.

But if you start jumping up and down on the trampoline, you'll send waves and tremors through the whole thing, and they can't help but be influenced by your motion.

Gravitational waves act in the same way, transmitting energy through ripples in the fabric of space-time itself. These ripples originate from just about every kind of motion possible, but since gravity is so weak (it is the weakest force of naturebillions of times over), and gravitational waves are weaker still, only the most energetic movements are capable of creating ripples able to be detected with instruments here on Earth.

So far, our gravitational-wave observatories LIGO and Virgo have spotted dozens of cataclysmic events, involving mergers of massive black holes and neutron stars. The gravitational waves from these events ripple throughout the universe, washing over the Earth. When they do, they ever-so-slightly (as in, less than the width of an atom) move things around.

Even you. Right now, you are being gently squeezed and stretched by gravitational waves from violent events billions of light-years away.

You might think that the event is over once the wave passes, like a breaker crashing onto you at the beach and washing onto the shore. But gravity is a tricky thing, and gravitational waves are trickier still.

Almost any kind of movement triggers the generation of a gravitational wave, from black holes smashing into each other to you waving your hand around. And even gravitational waves themselves.

As gravitational waves ripple through space-time, they become a source of new gravitational waves, which become a source of new gravitational waves, which become a source of new gravitational waves, and so on. Each new generation of waves is weaker than the last, but the effect builds up into what scientists call a space-time "memory" — a permanent distortion of space-time left in the wake of a passing gravitational wave.

In other words, when gravitational waves wash over you, you don't just stretch and squeeze temporarily. When all is said and done, you are left permanently stretched.


Gravitational waves, faint ripples in space and time that we've only managed to detect in the last few years, tend to pass very quickly. But after the waves pass, they might leave a region slightly altered — leaving behind a sort of memory of their crossing. These changes, which the researchers termed "persistent gravitational wave observables," would be even fainter than the actual gravitational waves, but those effects would last longer. Objects might be shifted slightly out of place. The positions of particles drifting through space might be altered. Even time itself might end up slightly out of sync, running briefly at disparate speeds in different parts of space time.