Statements (17)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
physics problem
|
| gptkbp:concerns |
strong interaction
CP symmetry violation of CP symmetry |
| gptkbp:describes |
absence of observed CP violation in strong interactions
|
| gptkbp:field |
particle physics
|
| gptkbp:first_discussed |
1970s
|
| https://www.w3.org/2000/01/rdf-schema#label |
Strong CP problem
|
| gptkbp:open_question |
why QCD does not violate CP symmetry
|
| gptkbp:parameter |
theta angle
|
| gptkbp:possible_solution |
gptkb:Peccei-Quinn_theory
gptkb:axion |
| gptkbp:relatedTo |
gptkb:quantum_chromodynamics
neutron electric dipole moment |
| gptkbp:theta_angle |
experimentally constrained to be very small
|
| gptkbp:bfsParent |
gptkb:Axions
|
| gptkbp:bfsLayer |
7
|