Multipoles of the relativistic galaxy bispectrum

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dc.contributor.authorClarkson, Chris
dc.contributor.authorde Weerd, Eline M.
dc.contributor.authorJolicoeur, Sheean
dc.date.accessioned2021-02-17T07:45:57Z
dc.date.available2021-02-17T07:45:57Z
dc.date.issued2020
dc.description.abstractAbove the equality scale the galaxy bispectrum will be a key probe for measuring primordial non-Gaussianity which can help differentiate between different inflationary models and other theories of the early universe. On these scales a variety of relativistic effects come into play once the galaxy number-count fluctuation is projected onto our past lightcone. By decomposing the Fourier-space bispectrum into invariant multipoles about the observer’s line of sight we examine in detail how the relativistic effects contribute to these. We show how to perform this decomposition analytically, which is significantly faster for subsequent computations. While all multipoles receive a contribution from the relativistic part, odd multipoles arising from the imaginary part of the bispectrum have no Newtonian contribution, making the odd multipoles a smoking gun for a relativistic signature in the bispectrum for single tracers. The dipole and the octopole are significant on equality scales and above where the Newtonian approximation breaks down. This breakdown is further signified by the fact that the even multipoles receive a significant correction on very large scales.en_US
dc.identifier.citationClarkson, C. et al. (2020). Multipoles of the relativistic galaxy bispectrum. Journal of Cosmology and Astroparticle Physics, 2020(05)en_US
dc.identifier.issn10.1088/1475-7516/2020/05/018
dc.identifier.urihttp://hdl.handle.net/10566/5942
dc.language.isoenen_US
dc.publisherIOP Publishing Ltden_US
dc.subjectPower spectrumen_US
dc.subjectRedshift surveysen_US
dc.subjectCosmic weben_US
dc.subjectRelativisticen_US
dc.subjectGalaxy surveysen_US
dc.titleMultipoles of the relativistic galaxy bispectrumen_US
dc.typeArticleen_US

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