Savas Dimopoulos

Baryon number of the universe

We consider the possibility that the observed particle-antiparticle imbalance in the universe is due to baryon-number, $C$, and $\mathrm{CP}$ nonconservation. We make general ob...

Baryon asymmetry in the very early universe

The hierarchy problem and new dimensions at a millimeter

Phenomenology, astrophysics, and cosmology of theories with submillimeter dimensions and TeV scale quantum gravity

We recently proposed a solution to the hierarchy problem not relying on low-energy supersymmetry or technicolor. Instead, the problem is nullified by bringing quantum gravity do...

New origin for approximate symmetries from distant breaking in extra dimensions

The recently proposed theories with TeV-scale quantum gravity remove the\nusual ultraviolet desert between $\\sim 10^{3} - 10^{19}$ GeV where effective\nfield theory ideas apply...