VARIOUS & SUNDRY 2

Explanation of inertia of objects w/ mass:
It must be because spacetime (quantum vacuum) is a superfluid!
When a force applied to an object submerged in a superfluid medium,
it would show resistance against acceleration!
But, it would show no resistance against motion in constant velocity!

Can Double-Slit Experiment be modified to show/prove information nature of quantum particles (electrons)?
(Add detectors to each slit to cause information loss (interference pattern disappears)
but add back information to electrons (to bring back interference pattern!),
by making them pass-thru an electric (or laser) field!?)

Femtosecond laser pulses create large spacetime curvatures nearby that can deflect normal laser photons?

What happens to gravitational field of a particle in double-slit experiment?:
An individual quantum particle probably do not have a gravitational field because spacetime is average/collective behavior of virtual particles of quantum vacuum (@ much higher scales than average particle size)!
(It is like asking what is fluid pressure of an individual fluid molecule (which is not really a unit fluid)!)

(20190816)
IMHO, redshift of CMB photons is NOT caused by, spacetime expanding on the way (& causing photon wavelengths to stretch & energies to drop)!
When a galaxy moves towards us, then its light looks blueshifted, but, its photons do not actually change, only our perception (& measurement) of them changes!
IMHO, redshift/blueshift of photons of other galaxies (in any combined relative motion compared to us observers) is only because of Relativistic Doppler Effect!
IMHO, redshift of CMB photons is also because of Relativistic Doppler Effect!
Because, our perception of them is, they are all always coming/originating from the edge of our visible universe!
& that perception is, a spherical surface (all around us observers (who are in the center)), that keeps getting away from us, faster & faster @ relativistic speeds!
(Question: If this is true, then, would it mean, calculation of Hubble constant using CMB is currently done wrong?)