Cosmic eggs to relax the cosmological constant

In theories with extra dimensions, the cosmological hierarchy problem can be thought of as unnaturally large radius observable universe in Kaluza-Klein units. We sketch a dynamical mechanism that relaxes this. early scenario we propose, three spatial dimensions arise through tunneling from 'cosmic egg', an effectively one-dimensional configuration all compact and comparable, small size. If string landscape is dominated by low-dimensional compactifications, cosmic eggs would natural initial conditions for cosmology. A quantum treatment toy model egg predicts that, variant Hartle-Hawking state, break to form higher dimensional universes small, but positive constant or quintessence energy. Hence cosmology yields which seemingly observed value vacuum energy conditions.