Killer splits

Killer splits

Although killer whales showed overall low levels of mitochondrial sequence variation, the researchers found three fixed differences between the open-sea type A whales compared with the two ice-inhabiting, other forms. " The genetic pattern suggests that, for females at least, there is no gene flow between them, " the authors write. But they do point out that the evidence for reproductive isolat...

Animal splits

of protein for the mountain pygmy possum, a tiny 45 g possum and the only mammal unique to alpine and subalpine areas of Australia. Pygmy possums have a range totalling less than ten square kilometres and almost entirely coincident with Australian ski resorts, so it is perhaps fortuitous for them that they hibernate during the winter. Winter-active mammals, like the dusky antechinus (a carnivor...

Matroids from hypersimplex splits

Minimal SO(10) splits supersymmetry

A good fit of the fermion masses and mixings has been found in the minimal renormalizable supersymmetric SO(10). This solution needs a strongly split supersymmetry breaking scenario with gauginos and higgsinos around 100 TeV, sfermions close to 1014 GeV and a low GUT scale of around 6 × 1015 GeV. We predict fast proton decays through SO(10) type of d = 6 operators and the leptonic mixing angle ...

SUSY Splits, But Then Returns

We study the phenomenon of accidental or “emergent” supersymmetry within gauge theory and connect it to the scenarios of Split Supersymmetry and Higgs compositeness. Combining these elements leads to a significant refinement and extension of the proposal of Partial Supersymmetry, in which supersymmetry is broken at very high energies but with a remnant surviving to the weak scale. The Hierarchy...