Speaker
Description
With increasing significance, the H0-tension between the Local Distance Ladder and Planck ΛCDM-analysis of the CMB points to a new principle of cosmological spacetime. Distinct from conventional extrapolations of general relativity in the Solar system, cosmological spacetime contains heat as a relic of the Big Bang based on Planck scale structures in black hole spacetimes. A path integral formulation produces a system of equations that satisfy T-duality in the Friedmann scale factor - a new symmetry in the Hubble expansion H(z) \simeq (1+(6/5)OmegaM0[(1+z)^5-1])^{1/2}/(1+z). It satisfies H0 \simeq 73 km/s/Mpc, q0 \simeq -1, OmegaM0 \simeq 0.25 relevant to tensions in (H0,q0,S8). [Based on van Putten, 2021, Phys. Lett. B, 823, 13637; 2020, MNRAS 491, L6.]
