The Role of Cross-Correlations in the Multi-Tracer Area

Mapping the same volume of space with different tracers allows us to obtain information through estimated quantities exploiting the multi-tracer technique. Indeed, the cross-correlation of different probes provides information that cannot be otherwise obtained. In addition, some estimated quantities...

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Bibliographic Details
Published in:Universe (Basel) 2022-09, Vol.8 (9), p.479
Main Author: Blanchard, Alain
Format: Article
Language:English
Subjects:
Astronomical research
Bias
Cosmic background radiation
cosmological parameters
Cosmology
Dark matter
Force and energy
galaxy surveys
Polls & surveys
Population
Stars & galaxies
Tracer techniques
Universe
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Summary:Mapping the same volume of space with different tracers allows us to obtain information through estimated quantities exploiting the multi-tracer technique. Indeed, the cross-correlation of different probes provides information that cannot be otherwise obtained. In addition, some estimated quantities are not sensitive to the noise produced by the sampling variance but are only limited by the shot (or Poisson) noise, an attractive perspective. A simple example is the ratio between the (cross)-correlations, measuring the ratio of the bias parameters. Multi-tracer approaches can thereby provide additional information that cannot be extracted from independent volumes.
ISSN:2218-1997
2218-1997
DOI:10.3390/universe8090479