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This is theoretical physics at its finest, drowning in complex mathematics but short on hard data.
So Fermilab particle astrophysicist Craig Hogan and his team are building a “holometer” to magnify spacetime and see if it is indeed as
noisy as the math suggests it might be at higher resolution. In
Fermilab’s largest laser lab, Hogan and company are putting together
what they call a “holographic interferometer,” which - like a classic
interferometer - will split laser beams and measure the difference in
frequencies between the two identical beams.
But unlike conventional interferometers, the holometer will measure for noise or interference in spacetime itself. It’s actually composed of
two interferometers - built one atop the other - that produce data on
the amount of interference or “holographic noise.” Since they are
measuring the same volume of spacetime, they should show the same amount
of correlated jitter in the fabric of the universe. It will produce the
first direct experimental insight into the fundamental nature of space
and time, and there’s no telling what researchers delving into that data
might find out about the holographic nature of the universe.
So enjoy the third dimension while you still can. Construction on the first instrument is already underway, and Hogan thinks they will begin
collecting data on the very nature of spacetime itself by next year.