Invariants and CP violation in the 2HDM

We discuss the importance of basis invariants in the general 2HDM and how these relates to masses and couplings. We also present a simple, yet powerful technique to translate parameters of the potential into combinations of masses and couplings of the theory and apply this to CP odd invariants.Comment: 14 pages. Talk given at Corfu Summer Institute 2017, School and Workshops on Elementary Particle Physics and Gravity, September 2017. To appear in conference proceeding

Organic production in Norway - status 2009

This poster shows the development of organic acreage and organic farmers 1991-2008 in Norway. Data for organic crop and animal production for the year 2008 are also shown. It then outlines policy and market environment for the Norwegian organic sector in 2009, as well as education, inspection and research within the sector

Current effects on scattering of surface gravity waves by bottom topography

Scattering of random surface gravity waves by small amplitude topography in the presence of a uniform current is investigated theoretically. This problem is relevant to ocean waves propagation on shallow continental shelves where tidal currents are often significant. A perturbation expansion of the wave action to second order in powers of the bottom amplitude yields an evolution equation for the wave action spectrum. A scattering source term gives the rate of exchange of the wave action spectrum between wave components, with conservation of the total action at each absolute frequency. With and without current, the scattering term yields reflection coefficients for the amplitudes of waves that converge, to the results of previous theories for monochromatic waves propagating in one dimension over sinusoidal bars. Over sandy continental shelves, tidal currents are known to generate sandwaves with scales comparable to those of surface waves. Application of the theory to such a real topography suggests that scattering mainly results in a broadening of the directional wave spectrum, due to forward scattering, while the back-scattering is generally weaker. The current may strongly influence surface gravity wave scattering by selecting different bottom scales with widely different spectral densities due the sharp bottom spectrum roll-off.Comment: submitted to Journal of Fluid Mechanics 7 Oct 200