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Improved Naturalness and the Two Higgs Doublet Model
Riccardo Barbieri, Lawrence J. Hall
The natural cutoff scale for the quadratically divergent top quark contribution to the Higgs mass parameter can be significantly raised above the surprisingly low standard model va…
Mirror World at the Large Hadron Collider
Riccardo Barbieri, Thomas Gregoire, Lawrence J. Hall
A mirror world can modify in a striking way the LHC signals of the Higgs sector. An exact or approximate Z_2 symmetry between the mirror world and our world allows large mixing bet…
Density Perturbations and the Cosmological Constant from Inflationary Landscapes
Brian Feldstein, Lawrence J. Hall, Taizan Watari
An anthropic understanding of the cosmological constant requires that the vacuum energy at late time scans from one patch of the universe to another. If the vacuum energy during in…
Dark Energy and Right-Handed Neutrinos
Riccardo Barbieri, Lawrence J. Hall, Steven J. Oliver +1
We explore the possibility that a CP violating phase of the neutrino mass matrix is promoted to a pseudo-Goldstone-boson field and is identified as the quintessence field for Dark…
Electroweak Baryogenesis from Late Neutrino Masses
Lawrence J. Hall, Hitoshi Murayama, Gilad Perez
Electroweak Baryogenesis, given a first order phase transition, does not work in the standard model because the quark Yukawa matrices are too hierarchical. On the other hand, the n…
Evolving Dark Energy with w Deviating from -1
Lawrence J. Hall, Yasunori Nomura, Steven J. Oliver
Theories of evolving quintessence are constructed that generically lead to deviations from the w = -1 prediction of non-evolving dark energy. The small mass scale that governs evol…