  According to the multiple point principle, Nature adjusts coupling parameters
so that many vacuum states exist and each has approximately zero vacuum energy
density. We apply this principle to the general two-Higgs doublet extension of
the Standard Model, by requiring the existence of a large set of degenerate
vacua at an energy scale much higher than the presently realized electroweak
scale vacuum. It turns out that two scenarios are allowed. In the first
scenario, a CP conserving Higgs potential and the absence of flavour changing
neutral currents are obtained without fine-tuning. In the second scenario, the
photon becomes massive in the high scale vacua. We briefly discuss the
resulting phenomenology.

High Energy Physics - Phenomenology