Yohannes Dereje Alemayehu

Mass Ratio, Not Peak Position: Three Lensing Tests of Quasi-Linear MOND in the Bullet Cluster

In the Bullet Cluster (1E 0657-558) the lensing mass is concentrated on the galaxies, whereas most of the baryons are in the X-ray-emitting gas. We test the quasi-linear formulation (QUMOND) of modified Newtonian dynamics (MOND) against three lensing measurements of the smaller c...

Two-step chiral ring exchange forced by conjugate representations in an SU(3) honeycomb magnet

On a bipartite lattice whose two sublattices carry conjugate representations of SU(N), the cyclic advance that moves each site state one step around a plaquette is not invariant: it commutes only with the real orthogonal subgroup SO(N). The obstruction survives a change of basis...

Two-step chiral ring exchange forced by conjugate representations in an SU(3) honeycomb magnet

On a bipartite lattice whose two sublattices carry conjugate representations of SU(N), the cyclic advance that moves each site state one step around a plaquette is not invariant: it commutes only with the real orthogonal subgroup SO(N). The obstruction survives a change of basis...