HEP Phenomenology2026-07-111 minarXiv:2607.10272expressThe Strong CP Problem: Much Ado About Nothing?Quantum chromodynamics is the theory that describes how quarks and gluons assemble into protons and neutrons. In its equations, there is a strange angle, the parameter θ (theta).Anthony G. WilliamsAlbert EinsteinAlan GuthVera Rubintopological defectStandard Model👍👎☆SimplePopularAdvanced