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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…
Dark Matter from an ultra-light pseudo-Goldsone-boson
Luca Amendola, Riccardo Barbieri
Dark Matter (DM) and Dark Energy (DE) can be both described in terms of ultra-light Pseudo-Goldstone-Bosons (PGB) with masses m_{DM} ~ 10^{-23}eV and m_{DE} <= 10^{-33}eV respectiv…
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…
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…