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It has been shown that QED in (1+4)-dimensional space-time, with the fifthdimension compactified on a circle, leads to CP violation (CPV). Depending onfermionic boundary conditions, CPV may be either explicit (through theScherk--Schwarz mechanism), or spontaneous (via the Hosotani mechanism). Thefifth component of the gauge field acquires (at the one-loop level) a non-zerovacuum expectation value. In the presence of two fermionic fields, this leadsto spontaneous CPV in the case of CP-symmetric boundary conditions.Phenomenological consequences are illustrated by a calculation of the electricdipole moment for the fermionic zero-modes.Comment: 11 pages, 2 figure

physical review letters

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>Violation from Five-Dimensional QED

CPViolation from Five-Dimensional QED