At some point an unknown reaction called baryogenesis
violated the conservation of baryon number, leading to a very small excess of quarks and leptons over antiquarks and antileptons--of the order of one part in 30 million.
r] is non-zero but small and determines the expansion during the baryogenesis
initial phase, as does the spatial dynamics expansion term because of the [alpha] dependence.
She has also worked on supersymmetry, Standard Model observables, cosmological inflation, baryogenesis
, grand unified theories, and aspects of string theory.