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Dogya

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Thread moved from the technical forums to the schoolwork forums

**TL;DR Summary:**Express through the Hubble constant the force that acts on the hydrogen atom due to the expansion of the universe

We have a hydrogen atom, in a gravitationally bound system nothing interesting happens to it. Let's put it in an empty world with only an electron and a proton. There are several forces acting on it: gravitational forces, electromagnetic forces, and since we only have two bodies, the expansion of the universe should work. The question is how to express through the Hubble constant and calculate the force of this expansion.

As pointed out to me, to solve this problem, we need to consider the case where we have two particles without electromagnetic interaction, such as 2 neutrons.

As I understood the solution has to be sought from Friedman equations.

This is difficult for me as I am only in my 2nd year of university.