From: Ground truth? Concept-based communities versus the external classification of physics manuscripts
% | Concept (cluster no. 1) | % | Concept (cluster no. 3) |
---|---|---|---|
43 | Hadronization | 55 | Isotope |
39 | Isospin | 53 | Hamiltonian |
37 | Pion | 39 | Hartree-Fock |
33 | Degree of freedom | 36 | Quadrupole |
32 | Heavy ion collision | 34 | Isospin |
31 | Quark | 31 | Nuclear matter |
29 | Chirality | 30 | Degree of freedom |
29 | Hamiltonian | 28 | Mean field |
29 | Nuclear matter | 26 | Harmonic oscillator |
26 | Coupling constant | 25 | Spin orbit |