Light dark matter: Acommon solution to the lithium and H-0 problems

Autor(es)

Alcaniz, Jailson ^[1] ; Bernal, Nicolas ^[2] ; Masiero, Antonio ^{[3, 4]} ; Queiroz, Farinaldo S. ^[5]

Afiliação do(s) autor(es)

^[1] Observ Nacl, BR-20921400 Rio De Janeiro, RJ - Brazil

^[2] Univ Antonio Narino, Ctr Invest, Bogota - Colombia

^[3] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua - Italy

^[4] Univ Padua, Dipartimento Fis & Astron G Galilei, Padua - Italy

^[5] Univ Fed Rio Grande do Norte, Int Inst Phys, Campus Univ, BR-59078970 Natal, RN - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physics Letters B; v. 812, JAN 10 2021.
• Citações Web of Science: 1

Resumo

Currently, the standard cosmological model faces some tensions and discrepancies between observations at early and late cosmological time. One of them concerns the well-known H-0-tension problem, i.e., a similar to 4.4 sigma-difference between the early-time estimate and late-time measurements of the Hubble constant, H-0. Another puzzling question rests in the cosmological lithium abundance, where again local measurements differ from the one predicted by Big Bang Nucleosynthesis (BBN). In this work, we show that a mechanism of light dark matter production might hold the answer for these questions. If dark matter particles are sufficiently light and a fraction of them were produced non-thermally in association with photons, this mechanism has precisely what is needed to destroy Lithium without spoiling other BBN predictions. Besides, it produces enough radiation that leads to a larger H-0 value, reconciling early and late-time measurements of the Hubble expansion rate without leaving sizable spectral distortions in the Cosmic Microwave Background spectrum. (C) 2020 The Authors. Published by Elsevier B.V. (AU)

• Processo FAPESP: 16/01343-7 - ICTP Instituto Sul-Americano para Física Fundamental: um centro regional para física teórica
• Beneficiário: Nathan Jacob Berkovits
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais