Sunday, 26 April 2020

cosmology - Does the Universe have finite number of particles?



I read that the number of atoms in the entire observable universe is estimated to be within the range of $10^{78}$ to $10^{82}$.


Does the Universe have finite number of particles? If so, how could it be determined?



Answer



The universe must contain a finite energy - sum of all matter and fields - or the mass-equivalent would collapse within its own gravitation. Said mass-energy is fractionally partitioned among elementary particles and their agglomerates. One then strongly expects there are a finite number of particles including extremely low energy photons and neutrinos.


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