Navegando por Autor "Silva Neto, Jacinto Paulo da"
Agora exibindo 1 - 2 de 2
- Resultados por página
- Opções de Ordenação
TCC An introduction to Large-scale Structure Formation(Universidade Federal do Rio Grande do Norte, 2019-12-05) Silva Neto, Jacinto Paulo da; Queiroz, Farinaldo da Silva; Silva, Raimundo; Rodrigues, JamersonThe present work presents a simplified approach on studies of large-scale structure formation. It is studied how large-scale structures such as galaxies and galaxy clusters form, evolve and are distributed in the universe. Evidence for the existence of Dark Matter are also addressed so highlight its relevance as one of the main ingredients of this process. Finally, we give a more quantitative description via the so called Matter Power Spectrum that allows us to calculate the distribution of matter in the current universe where observations indicate the existence of a huge abundance of Cold Dark Matter and a bit of Hot Dark Matter.Dissertação A right-handed neutrino dark matter phenomenology(Universidade Federal do Rio Grande do Norte, 2022-04-08) Silva Neto, Jacinto Paulo da; Queiroz, Farinaldo da Silva; Siqueira, Clarissa Martins; https://orcid.org/0000-0002-7141-5532; http://lattes.cnpq.br/9966377792236208; http://lattes.cnpq.br/4542506220770970; Alcaniz, Jailson Souza de; https://orcid.org/0000-0003-2441-1413; http://lattes.cnpq.br/4351190607357917; Silva, Paulo Sérgio Rodrigues daRight-handed neutrinos appear in several extensions beyond the Standard Model, specially in connection to neutrino masses. Motivated by this, we present a model of right-handed neutrino dark matter that interacts with Standard Model particles through a new gauge symmetry as well as via mass mixing between the new vector field and the Z boson, and investigate different production mechanisms. We derive the dark matter relic density in the Standard Cosmological Model, when the Hubble rate is faster than usual, when dark matter decouples in a matter domination epoch, and when it decouples in a radiation domination regime, which is then followed by a matter domination era. The direct detection rate features a spin-independent but velocity suppressed operators, as well as a spin-dependent operator when the mass mixing is correctly accounted for. We put all these results into perspective with existing flavor physics, atomic parity violation, and collider bounds. Lastly, we outline the region of parameter space in which a weak scale right-handed neutrino dark matter stands as a viable dark matter candidate.