CP-odd interaction of axion with matter

CP-odd interaction of axion with matter

In the world with axion the precise measurement of gravitational force and check of the equivalence principle at small distances, λ ∼ 1cm and less, could provide an additional test of CP symmetry. Using the chiral approach, we connect the strength of CP-odd axion-nucleon vertex with CP-odd pion-nucleon coupling for color electric dipole moments of quarks as a low energy source of CP violation. ...

Axion Potential, Topological Defects and CP-odd Bubbles in QCD

It follows on general grounds that the θ dependence in QCD is more complicated than suggested by the large Nc approach or instanton arguments. Generically, the vacuum energy Evac(θ) is a multi-valued function of θ admitting the existence of metastable states. We discuss decays of such metastable vacua in the theory with and without the axion, and point out the potential relevance of this and re...

CP-odd nucleon potential.

Axion BEC Dark Matter

Cold dark matter axions thermalize through gravitational self-interactions and form a BoseEinstein condensate when the photon temperature reaches approximately 500 eV. Axion Bose-Einstein condensation provides an opportunity to distinguish axions from the other dark matter candidates on the basis of observation. The rethermalization of axions that are about to fall in a galactic potential well ...

Spontaneous CP Violation Small Instanton & Invisible Axion

I propose a variant invisible axion model of spontaneous CP violation at the electroweak scale without CP domain-wall and ‘strong CP’ problems. Both large sized QCD and small sized non-QCD instantons break CP and Peccei-Quinn symmetries, and render cosmologically harmful CP domain walls unstable. The decaying epoch depends on size of small instanton effects, and is around 100eV if the current n...