Zobrazeno 1 - 10
of 50
pro vyhledávání: '"Emiliano Sefusatti"'
Publikováno v:
Advances in Astronomy, Vol 2010 (2010)
The most direct probe of non-Gaussian initial conditions has come from bispectrum measurements of temperature fluctuations in the Cosmic Microwave Background and of the matter and galaxy distribution at large scales. Such bispectrum estimators are ex
Externí odkaz:
https://doaj.org/article/b4bbb04bdd2a4df9af5d0dd6ac12159c
Autor:
Alessandra Fumagalli, Matteo Biagetti, Alex Saro, Emiliano Sefusatti, Anže Slosar, Pierluigi Monaco, Alfonso Veropalumbo
Data analysis in cosmology requires reliable covariance matrices. Covariance matrices derived from numerical simulations often require a very large number of realizations to be accurate. When a theoretical model for the covariance matrix exists, the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::57abc50ea34a767f6fe4b216df706c77
https://hdl.handle.net/11368/3044402
https://hdl.handle.net/11368/3044402
We measure the halo bispectrum covariance in a large set of N-body simulations and compare it with theoretical expectations. We find a large correlation among (even mildly) squeezed halo bispectrum configurations. A similarly large correlation can be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::383ae34554eeab8f04b0974d566b06ba
https://iopscience.iop.org/article/10.1088/1475-7516/2022/09/009
https://iopscience.iop.org/article/10.1088/1475-7516/2022/09/009
We present a joint likelihood analysis of the halo power spectrum and bispectrum in real space. We take advantage of a large set of numerical simulations and of an even larger set of halo mock catalogs to provide a robust estimate of the covariance p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0734de5099b81e993ff3f54a3bfd5793
http://arxiv.org/abs/2108.03204
http://arxiv.org/abs/2108.03204
Autor:
Alexandro Saro, Emiliano Sefusatti, Klaus Dolag, Tiago Castro, Miguel Quartin, Stefano Borgani, Valerio Marra
Publikováno v:
Monthly Notices of the Royal Astronomical Society
Luminous matter produces very energetic events, such as active galactic nuclei and supernova explosions, that significantly affect the internal regions of galaxy clusters. Although the current uncertainty in the effect of baryonic physics on cluster
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::42cad18e69f7afd572ed004dd17a7d6b
https://hdl.handle.net/11368/2980103
https://hdl.handle.net/11368/2980103
Autor:
Emiliano Sefusatti, Vincent Desjacques, Azadeh Moradinezhad Dizgah, Jorge Noreña, Matteo Biagetti
Upcoming galaxy redshift surveys promise to significantly improve current limits on primordial non-Gaussianity (PNG) through measurements of 2- and 3-point correlation functions in Fourier space. However, realizing the full potential of this dataset
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eab7c439cd3f94c03f5539954f08053c
http://hdl.handle.net/20.500.12386/31688
http://hdl.handle.net/20.500.12386/31688
Autor:
Davit Alkhanishvili, Cristiano Porciani, Emiliano Sefusatti, Matteo Biagetti, Andrei Lazanu, Andrea Oddo, Victoria Yankelevich
We provide a comparison between the matter bispectrum derived with different flavours of perturbation theory at next-to-leading order and measurements from an unprecedentedly large suite of $N$-body simulations. We use the $\chi^2$ goodness-of-fit te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f7b66c0825244cb336282a1b741f7161
Higher-order clustering statistics, like the galaxy bispectrum, can add complementary cosmological information to what is accessible with two-point statistics, like the power spectrum. While the standard way of measuring the bispectrum involves estim
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::077a73e4799855a39187393e9c64905f
http://arxiv.org/abs/2010.09579
http://arxiv.org/abs/2010.09579
The forthcoming generation of galaxy redshift surveys will sample the large-scale structure of the Universe over unprecedented volumes with high-density tracers. This advancement will make robust measurements of three-point clustering statistics poss
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a746569f2551b875653cfdcc17f65122
http://hdl.handle.net/11368/2997751
http://hdl.handle.net/11368/2997751
Autor:
Emiliano Sefusatti, Martin Crocce, Martha Lippich, Gustavo Yepes, Francisco-Shu Kitaura, Aniket Agrawal, A. Balaguera-Antolínez, Claudio Dalla Vecchia, Manuel Colavincenzo, Marcelo A. Alvarez, Sandrine Codis, Albert Izard, Pierluigi Monaco, Antonio Dorta, George Stein, Pablo Fosalba, Santiago Avila, Mohammadjavad Vakili, Linda Blot, Ariel G. Sánchez, Marcos Pellejero-Ibanez, Richard J. Bond
Publikováno v:
Mon.Not.Roy.Astron.Soc.
Mon.Not.Roy.Astron.Soc., 2019, 482 (4), pp.4883-4905. ⟨10.1093/mnras/sty2964⟩
Monthly Notices of the RAS (0035-8711), 482(4), 4883-4905
Colavincenzo, M, Sefusatti, E, Monaco, P, Blot, L, Crocce, M, Lippich, M, Sánchez, A G, Alvarez, M A, Agrawal, A, Avila, S, Balaguera-Antolínez, A, Bond, R, Codis, S, Vecchia, C D, Dorta, A, Fosalba, P, Izard, A, Kitaura, F-S, Pellejero-Ibanez, M, Stein, G, Vakili, M & Yepes, G 2019, ' Comparing approximate methods for mock catalogues and covariance matrices III : bispectrum ', Monthly Notices of the Royal Astronomical Society, vol. 482, no. 4, pp. 4883–4905 . https://doi.org/10.1093/mnras/sty2964
Mon.Not.Roy.Astron.Soc., 2019, 482 (4), pp.4883-4905. ⟨10.1093/mnras/sty2964⟩
Monthly Notices of the RAS (0035-8711), 482(4), 4883-4905
Colavincenzo, M, Sefusatti, E, Monaco, P, Blot, L, Crocce, M, Lippich, M, Sánchez, A G, Alvarez, M A, Agrawal, A, Avila, S, Balaguera-Antolínez, A, Bond, R, Codis, S, Vecchia, C D, Dorta, A, Fosalba, P, Izard, A, Kitaura, F-S, Pellejero-Ibanez, M, Stein, G, Vakili, M & Yepes, G 2019, ' Comparing approximate methods for mock catalogues and covariance matrices III : bispectrum ', Monthly Notices of the Royal Astronomical Society, vol. 482, no. 4, pp. 4883–4905 . https://doi.org/10.1093/mnras/sty2964
We compare the measurements of the bispectrum and the estimate of its covariance obtained from a set of different methods for the efficient generation of approximate dark matter halo catalogs to the same quantities obtained from full N-body simulatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dacc72c5a8578a51e93332a3e4b11472
https://hdl.handle.net/11368/2933294
https://hdl.handle.net/11368/2933294