Baryogenesis in false vacuum
  The null result in the LHC may indicate that the standard model is not
drastically modified up to very high scales such as the GUT/string scale.
Having this in the mind, we suggest a novel leptogenesis scenario realized in
the false vacuum of the Higgs field. If the Higgs field develops a large vacuum
expectation value in the early universe, a lepton number violating process is
enhanced, which we use for baryogenesis. To demonstrate the scenario, several
models are discussed. For example, we show that the observed baryon asymmetry
is successfully generated in the standard model with higher-dimensional
operators.
