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One of the deepest insights from the general theory of relativity is therelational nature of spacetime. While it is a generally agreed on that thenature of spacetime must be drastically different at the Planck scale, it hasbeen a common practice to assume a full pseudo-Riemannian geometry of spacetimeno matter what the physical fields present are, and to apply such geometry tocosmology. In the spirit of preserving the relational description of spacetime,we initiate a discussion on the applicability of general relativity all the wayto Planck scale, and propose the possibility that the full pseudo-Riemanniangeometry emerges as late as the time of electroweak phase transition whenspacetime acquires the projective structure necessary to describe the motionsof massive particles. A brief discussion of possible properties of spacetimeprior to electroweak symmetry breaking is followed by an exploration ofplausible experimental indications that such transition is real.

Massless spacetime: On spacetime geometry above the electroweak symmetry breaking scale