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I was wondering last night: are any of the fundamental forces "blocked" by an intervening object? I assume not, since there is nothing like that in the equations. But that is kind of interesting, since sometimes you hear talk of hypothetical particles like gravitons.

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Blocked? No. Greatly attenuated and restricted in what modes can be accommodated? Yes.

More critically though the study gets into how they used a reference wave packet to establish a stationary baseline for the interferometer. Assuming the experiment is sufficiently isolated to reduce noise below the necessary threshold this can work in principle.

https://www.science.org/doi/10.1126/sciadv.aec8045

> Blocked? No. Greatly attenuated and restricted in what modes can be accommodated? Yes.

Can you give me some examples? I guess I'm thinking lead barriers or a Bose Einstein condensate but curious what you mean here.

Your house has walls to attenuate photons.

Casimir plates are a good example, although Faraday cages are probably better known along with Mu-metal.

That's a very deep question. In some sense no, in some sense yes. I would say on the deepest level, no, they are not blocked.

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