Alternative ideas in cosmology

Lopez-Corredoira, Martin; Marmet, Louis

doi:10.48550/arxiv.2202.12897

Cited by 1 publication

(1 citation statement)

References 131 publications

(149 reference statements)

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“…Anyway, in Fig. 2b, our mechanism goes in the direction of a mixed cold+hot dark matter scenario, which may solve some small scale problems appearing in purely cold dark matter simulations [53][54][55][56][57].…”

Section: Energy Evolution Of Dark Mattermentioning

confidence: 99%

The hubble rate trouble: an effective field theory of dark matter

et al. 2023

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The Hubble constant inferred from the 6-parameter fit to the CMB power spectrum conflicts with the value obtained from direct measurements via type Ia supernova and Cepheids observations. We write down effective operators involving spin-0, spin-1/2, and spin-1 dark matter that lead to the relativistic production of dark matter particles at early times, and consequently lead to an increase in the number of relativistic degrees of freedom. This mechanism which is amenable to CMB, BBN, and structure formation observables can sufficiently raise the value of the Hubble constant derived from CMB and reconcile local and CMB probes of the Hubble constant. This mechanism alone increases $$H_0$$ H 0 up to $$70\, \textrm{km}\, \textrm{s}^{-1} \, \textrm{Mpc}^{-1}$$ 70 km s - 1 Mpc - 1 , and with the help of a Phantom-like cosmology, reach $$H_0 \simeq $$ H 0 ≃ 71–73 $$\textrm{km} \,\textrm{s}^{-1} \textrm{Mpc}^{-1}$$ km s - 1 Mpc - 1 . Lastly, we outline the region of parameter space which reproduces $$H_0 \simeq $$ H 0 ≃ 71–73 $$\textrm{km} \,\textrm{s}^{-1} \, \textrm{Mpc}^{-1}$$ km s - 1 Mpc - 1 while obeying all relevant constraints.

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Section: Energy Evolution Of Dark Mattermentioning

confidence: 99%