| Texto completo | |
| Autor(es): |
Guandalin, Caroline
[1]
;
Adamek, Julian
[2, 3]
;
Bull, Philip
[4, 2]
;
Clarkson, Chris
[4, 2]
;
Abramo, L. Raul
[1]
;
Coates, Louis
[2]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Fis, Dept Fis Matemat, Rua Matao 1371, BR-05508090 Sao Paulo - Brazil
[2] Queen Mary Univ London, Sch Phys & Astron, 327 Mile End Rd, London E1 4NS - England
[3] Univ Zurich, Inst Computat Sci, Winterthurerstr 190, CH-8057 Zurich - Switzerland
[4] Univ Western Cape, Dept Phys & Astron, ZA-7535 Cape Town - South Africa
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 501, n. 2, p. 2547-2561, FEB 2021. |
| Citações Web of Science: | 1 |
| Resumo | |
Planned efforts to probe the largest observable distance scales in future cosmological surveys are motivated by a desire to detect relic correlations left over from inflation and the possibility of constraining novel gravitational phenomena beyond general relativity (GR). On such large scales, the usual Newtonian approaches to modelling summary statistics like the power spectrum and bispectrum are insufficient, and we must consider a fully relativistic and gauge-independent treatment of observables such as galaxy number counts in order to avoid subtle biases, e.g. in the determination of the f(NL) parameter.In this work, we present an initial application of an analysis pipeline capable of accurately modelling and recovering relativistic spectra and correlation functions. As a proof of concept, we focus on the non-zero dipole of the redshift-space power spectrum that arises in the cross-correlation of different mass bins of dark matter haloes, using strictly gauge-independent observable quantities evaluated on the past light cone of a fully relativistic N-body simulation in a redshift bin 1.7 <= z <= 2.9. We pay particular attention to the correct estimation of power spectrum multipoles, comparing different methods of accounting for complications such as the survey geometry (window function) and evolution/bias effects on the past light cone, and discuss how our results compare with previous attempts at extracting novel GR signatures from relativistic simulations. (AU) | |
| Processo FAPESP: | 18/10396-2 - Técnicas estatísticas para levantamentos futuros: extraindo física primordial da estrutura em larga escala |
| Beneficiário: | Caroline Macedo Guandalin |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 18/04683-9 - Estruturas em grandes escalas no universo local com o levantamento S-PLUS |
| Beneficiário: | Luis Raul Weber Abramo |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |