Hi there, I have a problem to solve in Cosmology which says: "Write the formulas for the quantum kinetic energy of neutrons, protons and electrons as well as the formula for the gravitational energy for a neutron star that is comprised of free neutrons, protons and electrons in a ratio of Nn : Np : Ne = 93,4 : 6,6 : 6,6 (Nν=Nn+Nn=1,8x1057) The numerical coefficients should be these for homogeneous density." Attempt for solution I find in the book "From Quarks to Quasars" by E.N.Economou that the total quantum kinetic energy of neutrons is 92,14% of the total, Uk,tot=Uk,n/0,9214=(ακ/0,9214)ħ2N5/3/(mnR2). The coefficients are aκ=1,1. This equation is derived from the total kinetic energy of N fermionic particles (s=1/2) that are similar and non relativistic. And my question is: How can this equation be used for neutrons (and protons) which are bosons and don't follow Fermi's exclusion principle (where this equation is derived from)?