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we find a 5.3 tension between late-Universe determinations of H0. We discuss a simple mechanism which can stop the scalar field in the desired minimum. 2016) collaboration, which finds H0 74.03 +/- 1.42 km/s/Mpc (Riess et. Therefore, the end result of chain EDE could provide a natural explanation of dark energy, if the tunneling becomes extremely slow in the final step before the field reaches zero (or negative) energy. Chris Martin took the time to dedicate Coldplay’s latest ditty to girlfriend Dakota Johnson during the group’s Tuesday night show at Shepherd’s Bush Empire in London.
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Interestingly, the energy difference between vacua can be roughly the size of today’s dark energy (milli-electron-volt scale). Martin Ryle Penzias and Wilson (1965) Strong support for big bang model.
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We construct a specific example of chain EDE featuring a scalar field in a quasiperiodic potential (a tilted cosine), which is ubiquitous in axion physics and, therefore, carries strong theoretical motivation. It’s was a random rally for all MPC enlisted personal and it was very fun :)Facebook link: redirtokenQUFFLU.
#Martin mpc universes series#
We indeed obtain this required behavior with a series of N tunneling events, and show that for N > 600 the phase transitions are rapid enough to allow fast percolation and thereby avoid large scale anisotropies in the CMB. As in all EDE models, the contribution of the vacuum energy to the total energy density of the universe is initially negligible, but reaches ∼ 10 % around matter-radiation equality, before cosmological data require it to redshift away quickly-at least as fast as radiation. imation to late cosmological eras in universes dominated by dark energy) this goes as v(t) v 0e Ht. superclusters (typically smaller than 20 Mpc 4) will remain cohesive in future expansion. In chain EDE, the universe undergoes a series of first order phase transitions, starting at a high energy vacuum in a potential, and tunneling down through a chain of every lower energy metastable minima. Oxford Martin School, University of Oxford JanuAbstract. We propose a new model of early dark energy (EDE) as a possible solution to the Hubble tension in cosmology, the apparent discrepancy between local measurements of the Hubble constant H 0 ≃ 74 km s − 1 Mpc − 1 and H 0 ≃ 67 km s − 1 Mpc − 1 inferred from the cosmic microwave background (CMB).