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The three cosmological conjectures to which our work refers are: thephenomenon called geodesic incompleteness, the physical gravitational$\theta_G$-term that would characterize the 1-parameter family of inequivalentvacua of quantum gravidynamics, and the hypothesis of multiversality, morespecifically, a zero-energy multiverse.  The known cosmological phenomenology leads under plausible assumptions totheorems which establish that the universe is past incomplete. Here, startingfrom Wilczek's definition of multiverse (a larger physical structure of whichthe universe forms part) and that spacetime is much larger than the observableuniverse, in a new sense suggested by these theorems, we place the observableuniverse, labelled by $U_{\theta_G^{(1)}}$, within a multiverse ensemble,$\{U_{\theta_G}\}$. Its topological $\theta_G^{(1)}$-term would characterizethe observable universe from the Planck epoch until the present time, and itcould have physical effects in, for example, black-hole physics.  Our proposal is therefore a possible framework for a multiverse quantumcosmology, in which the temporal parameters (see figures in the main text)start from a "timeless multiverse big bang" (TLMBB), where all members of themultiverse ensemble, $\{U_{\theta_G}\}$, disappear, together with theircorresponding classical spacetimes. Since quantum cosmology can be viewed asone attempt among many to face with the question of finding a gravitationalquantum theory, if the TLMBB were the appropriate ground to define the physicalor mathematical underlying structure of quantum cosmology, then multiversalitycould come to have a predictive power within our observable universe.

Before spacetime: A proposal of a framework for multiverse quantum cosmology based on three cosmological conjectures