Can the Multiverse Be Tested Scientifically?

Physicists aren’t afraid of thinking big, but what happens when you think too big? This philosophical question overlaps with real physics when hypothesizing what lies beyond the boundary of our observable universe. The problem with trying to apply science to something that may or may not exist beyond our physical realm is that it gets a little foggy as to how we could scientifically test it. A leading hypothesis to come from cosmic inflation theory and advanced theoretical studies — centering around the superstring hypothesis — is that of the “multiverse,” an idea that scientists have had a hard time in testing. But now, scientists at the Perimeter Institute for Theoretical Physics, in Ontario, Canada have, for the first time, created a computer model of colliding universes in the multiverse in an attempt to seek out observational evidence of its existence.

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links from the above article

Is The Universe A Bubble? Let’s Check

Will Science Burst the Multiverse’s Bubble?

At least two types of multiverse have already been tested scientifically, the topological multiverse and the variable equations of physics multiverse. Both have negative results.

The scientific test for the topological multiverse was to see if there was any duplication at cosmically large distances of similar objects in different directions. No matches were found.

The scientific test for variable equations of physics was whether the distant universe is isotropic, independent of direction. The cosmic microwave background says that it is, and there are no significant differences at extreme distances seen between the Hubble Deep Field and the Hubble Deep Field South.

As for scientific tests of the quantum multiverse – I’ll leave that to others to discuss.

The article talks about string theory multiverse of colliding branes.

I should have added that Baryon Acoustic Oscillation can in theory prove distances past the observed cosmic microwave background. And in addition, spectral separation of the frequencies present in the cosmic microwave background have the potential to look earlier as well.

mollwollfumble said:

At least two types of multiverse have already been tested scientifically, the topological multiverse and the variable equations of physics multiverse. Both have negative results.

The scientific test for the topological multiverse was to see if there was any duplication at cosmically large distances of similar objects in different directions. No matches were found.

The scientific test for variable equations of physics was whether the distant universe is isotropic, independent of direction. The cosmic microwave background says that it is, and there are no significant differences at extreme distances seen between the Hubble Deep Field and the Hubble Deep Field South.

Aren’t both of those testing if another universe exists within our own?, what about entirely seperate universes currently inaccessible from ours.

Cymek said:

mollwollfumble said:

At least two types of multiverse have already been tested scientifically, the topological multiverse and the variable equations of physics multiverse. Both have negative results.

The scientific test for the topological multiverse was to see if there was any duplication at cosmically large distances of similar objects in different directions. No matches were found.

The scientific test for variable equations of physics was whether the distant universe is isotropic, independent of direction. The cosmic microwave background says that it is, and there are no significant differences at extreme distances seen between the Hubble Deep Field and the Hubble Deep Field South.

Aren’t both of those testing if another universe exists within our own?, what about entirely seperate universes currently inaccessible from ours.

>>> Can the Multiverse Be Tested Scientifically?

Enthusiastically thrusts hand in the air “Sir, Sir, Sir, ah,? with a Multi meter?”

Cymek said:

mollwollfumble said:

At least two types of multiverse have already been tested scientifically, the topological multiverse and the variable equations of physics multiverse. Both have negative results.

The scientific test for the topological multiverse was to see if there was any duplication at cosmically large distances of similar objects in different directions. No matches were found.

The scientific test for variable equations of physics was whether the distant universe is isotropic, independent of direction. The cosmic microwave background says that it is, and there are no significant differences at extreme distances seen between the Hubble Deep Field and the Hubble Deep Field South.

And anyway, it’s only testing as far as we can see, which on the scale of the Universe is nothing.

Aren’t both of those testing if another universe exists within our own?, what about entirely seperate universes currently inaccessible from ours.

Missed this thread. I’ll have a squint at the linked articles later and report back.

What would happen if another universe bumped into ours?

or if another universe moved into/through ours like galaxies pass through each other?

would we notice it?