9,590 research outputs found
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
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