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16/09/2024, 09:50
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Luigi Guzzo16/09/2024, 10:00
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Enzo Franco Branchini (Istituto Nazionale di Fisica Nucleare)16/09/2024, 10:20
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Marco Regis16/09/2024, 10:40
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Prof. Stefano Camera (Università degli Studi di Torino & INFN Torino)16/09/2024, 11:35
I examine galaxy peculiar velocities as a cosmological probe and compute their kernels in standard perturbation theory up to second order. With these, I construct the peculiar velocity power spectrum and bispectrum at tree level. I find agreement with the literature for the former and I derive the expression for the latter for the first time. As a byproduct, I also derive the bispectrum of the...
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Daniele Bertacca (Istituto Nazionale di Fisica Nucleare)16/09/2024, 12:00
The peculiar velocity of the observer induces a dipolar signature on galaxy density maps derived from redshift surveys. Following Elkhashab Porciani & Bertacca paper (in prep) [see also Elkhashab, Porciani and Bertacca, Mon. Not. Roy. Astron. Soc. 509, no.2, 1626-1645 (2021), arXiv:2108.13424], in this talk, I focus on assessing the impact of this signature on the multipoles of the observed...
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Marco Raveri (Istituto Nazionale di Fisica Nucleare)16/09/2024, 12:25
I will discuss how to understand and cope with projection effects concerning posterior distributions from cosmological experiments, with a particular focus on LSS surveys.
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48. Detecting Relativistic Doppler in Galaxy Clustering via Multi-tracing a Single Galaxy PopulationFederico Montano (Istituto Nazionale di Fisica Nucleare)16/09/2024, 14:20
The description of gravity, i.e. the theory of general relativity, plays a crucial role in our understanding of the universe. However, confirmations of the validity of this theory on cosmological scales have hitherto eluded us. In this context, the detection of relativistic Doppler via galaxy power spectrum measurements could further confirm the validity of general relativity at scales very...
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Francesco Verdiani (SISSA)16/09/2024, 14:40
Upcoming data from galaxy surveys has the potential to yield a detection of the sum of the neutrino masses. Therefore, state-of-the-art models for full-shape analyses of correlation functions need a complete validation in the context of massive neutrino cosmologies.
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We perform a joint analysis of the power spectrum and bispectrum using a suite of mock galaxy catalogs built upon N-body... -
Dr Stefano Ettori (INAF-OAS Bologna)16/09/2024, 15:00
Galaxy clusters are dark-matter-dominated systems enclosed in a volume that is a high-density microcosm of the rest of the universe. I will present the most recent results on the distribution of their gravitating and baryonic mass obtained from our XMM-Newton Multi-year Heritage and Large Programmes (CHEX-MATE, X-COP) complemented with Planck maps, highlighting the role of X-ray and SZ data in...
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16/09/2024, 16:15
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Davide Bianchi17/09/2024, 09:00
In its first year of observations the Dark Energy Spectroscopic Instrument (DESI) has built the largest map of galaxy redshifts to date, I will present the first set of cosmological results, coming from measurements of the baryonic acoustic oscillations (BAO) characteristic scale. The analysis of the full shape of the power spectrum is still ongoing but there is a chance that the results will...
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Michele Moresco (Universita' di Bologna)17/09/2024, 09:25
Higher-order correlation functions (such as the three-point correlation function, 3PCF) will play a crucial role in future cosmological surveys since they complement the information provided by the (more commonly used) lower-order correlation functions (e.g., the two-point correlation function, 2PCF) allowing a significant gain in the cosmological information extracted from Large Scale...
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Massimo Guidi (University of Bologna)17/09/2024, 09:50
For galaxy clustering, constraining cosmological parameters using the three-point correlation function has historically been hindered by the computational cost of modelling. Here, we introduce a new emulator developed as part of an Euclid Preparation Key Project, which significantly accelerates MCMC evaluations. For the first time in a simulation study, we present constraints on cosmological...
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Chiara Moretti (SISSA)17/09/2024, 10:10
Ongoing spectroscopic Stage-IV galaxy surveys, such as Euclid and DESI, are starting to deliver high precision data that will allow to map the Universe over unprecedented volume and measure cosmological observables with high precision, with the ultimate goal of investigating the dark sector. Inferring cosmological parameters from such measurements requires fast and flexible analysis pipelines...
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Gabriele Parimbelli17/09/2024, 11:10
In the era of Stage IV galaxy surveys, model testing and validation with numerical simulations is crucial to obtain accurate and unbiased estimates of the cosmological parameters. To this end, the generation of realistic galaxy mock catalogs that faithfully reproduce the measurable properties of the observed sky is of utter importance.
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In this talk, I will present HoDpipe, a new tool to... -
Isabella Paola Carucci (INAF - Trieste)17/09/2024, 11:30
Galaxy surveys can be photometric (big volumes but also big redshift errors) or spectroscopic (accurate redshifts but small volumes). The technique that goes beyond this compromise is hydrogen intensity mapping (HI IM). Indeed, radio telescopes tomographically characterise the Universe, detecting the redshifted 21 cm radiation emitted by cosmic neutral hydrogen: both large areas and...
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Matilde Barberi Squarotti (Università degli Studi di Milano)17/09/2024, 11:50
Neutral hydrogen (HI) intensity mapping is arising as a novel probe of the Large Scale Structure of the Universe, and the MeerKAT radiotelescope is being used in the so called single-dish mode to test this technique as a precursor of the SKAO. These observations are characterised by a variety of systematics and astrophysical foregrounds that are much more intense than the cosmological signal...
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Jiakang Han17/09/2024, 12:10
Understanding the intricate relationship between star-formation rates from Comic Infrared
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Background(CIB) and other large scale structure tracers holds key insights into the evolving
cosmic landscape. By cross-correlating the CIB data and other large-scale structure (i.e. CMB
lensing and galaxy clustering), we can unravel the underlying dynamics and give better
constrains on the models... -
Pierluigi Monaco (Istituto Nazionale di Fisica Nucleare)17/09/2024, 14:00
I will show recent updates on the Euclid strategy to control systematics of the spectroscopic sample used for galaxy clustering.
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Antonio Farina (Istituto Nazionale di Fisica Nucleare), Edoardo Maragliano (Istituto Nazionale di Fisica Nucleare, UniGe)17/09/2024, 14:25
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Giulia Degni (Università Roma Tre)17/09/2024, 14:50
Cosmic voids, large under-dense regions in the Universe, serve as promising laboratories for extracting cosmological information. They offer opportunities to explore deviations from $\Lambda 𝐶𝐷𝑀$ and provide insights into dark energy and modification of gravity. Upcoming surveys like Euclid will enable detailed void analyses, allowing access to a huge number of voids. Voids' significance lies...
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Punyakoti Ganeshaiah Veena17/09/2024, 15:10
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17/09/2024, 16:15
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Stefano Gariazzo (INFN Torino)
We discuss the phenomenology of neutrino decoupling in the early universe, by summarising the details of the calculation in standard and non-standard scenarios. We present the state-of-the-art calculation of the effective number of neutrino species in the early universe (Neff) in the three-neutrino case, which gives Neff=3.044, and show how the result can change when additional particles,...
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