# Question on particles

Is there any theory in which every particle can be further subdivided into any number of particles and the total number of particles any where in the space time are infinity in theory and only due to practical constraints that we are capable of observing the known particles in the current World.

Also could you please explain the nature of the two widely accepted theories which explain the small scale and large scale universe which are QP and GR repectively in the current context of the question.

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You may consider every excited state of an atom $\Psi_n$ as another particle. Then their number may be infinite even in this simple example. The higher energy of the system, the higher $n$.

In QFT each particle has occupation numbers. During reactions some occupation numbers decrease, some other increase. Factually QFT equations are the balance equations governing the occupation numbers while interactions.

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