Setembro 2022 vol. 8 num. 1 - As Astrocientistas - I Encontro Brasileiro de Meninas e Mulheres da Astrofísica, Gravitação e Cosmologia

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Perspectivas para a física de ultralargas escalas: inflação e efeitos relativísticos

Perspectives for ultralarge-scale physics: inflation and relativistic effects

Guandalin, Caroline ;

Artigo completo:

Esforços para observar as maiores escalas do Universo com levantamentos de galáxias futuros são motivados pelo desejo de detectar correlações oriundas de um possível período inflacionário e da possibilidade de restringir fenômenos que vão além da relatividade geral. Em escalas extremamente grandes, a abordagem Newtoniana é insuficiente para modelar o espectro de potências e o bispectro. Portanto, para interpretarmos corretamente as medidas em tais escalas, devemos considerar um tratamento relativístico e independente de calibre para as observáveis cosmológicas (e.g. contagem de galáxias). Revisarei as principais características físicas das escalas ultralargas (i.e., da ordem do horizonte cosmológico), dando particular atenção para possíveis equívocos na restrição de parâmetros inflacionários e para a característica mais marcante do espectro e bispectro relativísticos: a presença de momentos ímpares na expansão de Legendre. Também mostrarei, brevemente, como é possível utilizar halos contidos em um cone de luz de uma simulação de N-corpos relativística para modelar e recuperar o dipolo relativístico.

Artigo completo:

Efforts to observe the largest scales of the Universe with surveys of future galaxies are motivated by the desire to detect correlations arising from a possible inflationary period and the possibility of restricting phenomena that go beyond general relativity. At extremely large scales, the Newtonian approach is insufficient to model the power spectrum and the bispectrum. Therefore, to correctly interpret measurements on such scales, we must consider a relativistic and gauge-independent treatment for cosmological observables (e.g. galaxy counts). I will review the main physical characteristics of ultrawide scales (i.e., of the order of the cosmological horizon), paying particular attention to possible mistakes in the restriction of inflationary parameters and to the most striking feature of the relativistic spectrum and bispectrum: the presence of odd moments in the Legendre expansion. I will also briefly show how it is possible to use halos contained in a cone of light from a relativistic N-body simulation to model and recover the relativistic dipole.

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Palavras-chave: estrutura em larga escala do universo, efeitos relativísticos, inflação cósmica,

Palavras-chave: large-scale structure of the universe, relativistic effects, cosmic inflation,

DOI: 10.5151/astrocientistas2021-6

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Como citar:

Guandalin, Caroline; "Perspectivas para a física de ultralargas escalas: inflação e efeitos relativísticos", p. 44-58 . In: Anais do I Encontro Brasileiro de Meninas e Mulheres da Astrofísica, Gravitação e Cosmologia - As Astrocientistas. São Paulo: Blucher, 2022.
ISSN 2358-2359, DOI 10.5151/astrocientistas2021-6

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