dc.contributor.author Baumann, Daniel dc.contributor.author Green, D dc.contributor.author Wallisch, Benjamin dc.date.accessioned 2018-09-11T17:32:32Z dc.date.available 2018-09-11T17:32:32Z dc.date.issued 2018-08 dc.identifier.issn 1475-7516 dc.identifier.uri https://www.repository.cam.ac.uk/handle/1810/280202 dc.description.abstract Light thermal relics of the hot big bang, often quantified by the parameter $N_\mathrm{eff}$, are one of the primary targets of cosmological measurements. At present, the energy density in such relics is constrained to be less than ten percent of the total energy density in radiation. Upcoming cosmic microwave background (CMB) experiments, however, have the potential to measure the radiation density at the one-percent level, which is close to well-motivated theoretical targets. In this paper, we explore to what degree the CMB observations can be enhanced by future large-scale structure surveys. We carefully isolate the information encoded in the shape of the galaxy power spectrum and in the spectrum of baryon acoustic oscillations (BAO). We find that measurements of the shape of the power spectrum can significantly improve on current and near-term CMB experiments. We also show that the phase shift of the BAO spectrum induced by relic neutrinos can be detected at high significance in future experiments. dc.publisher IOP Publishing dc.rights Attribution 4.0 International dc.rights.uri https://creativecommons.org/licenses/by/4.0/ dc.title Searching for light relics with large-scale structure dc.type Article prism.issueIdentifier 8 prism.publicationDate 2018 prism.publicationName Journal of Cosmology and Astroparticle Physics prism.volume 2018 dc.identifier.doi 10.17863/CAM.27569 rioxxterms.versionofrecord 10.1088/1475-7516/2018/08/029 rioxxterms.licenseref.uri http://www.rioxx.net/licenses/all-rights-reserved rioxxterms.licenseref.startdate 2018-08-21 dc.contributor.orcid Wallisch, Benjamin [0000-0001-5713-1720] dc.identifier.eissn 1475-7516 dc.publisher.url http://dx.doi.org/10.1088/1475-7516/2018/08/029 rioxxterms.type Journal Article/Review pubs.funder-project-id Science and Technology Facilities Council (ST/M007065/1) cam.issuedOnline 2018-08-21
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