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dc.contributor.authorYennapureddy, Manoj K.
dc.contributor.authorMelia, Fulvio
dc.date.accessioned2018-12-12T01:03:40Z
dc.date.available2018-12-12T01:03:40Z
dc.date.issued2018-03-26
dc.identifier.citationYennapureddy, M. K., & Melia, F. (2018). A cosmological solution to the Impossibly Early Galaxy Problem. Physics of the dark universe, 20, 65-71.en_US
dc.identifier.issn22126864
dc.identifier.doi10.1016/j.dark.2018.03.003
dc.identifier.urihttp://hdl.handle.net/10150/631135
dc.description.abstractTo understand the formation and evolution of galaxies at redshifts 0 less than or similar to z less than or similar to 10, one must invariably introduce specific models (e.g., for the star formation) in order to fully interpret the data. Unfortunately, this tends to render the analysis compliant to the theory and its assumptions, so consensus is still some-what elusive. Nonetheless, the surprisingly early appearance of massive galaxies challenges the standard model, and the halo mass function estimated from galaxy surveys at z greater than or similar to 4 appears to be inconsistent with the predictions of Lambda CDM, giving rise to what has been termed "The Impossibly Early Galaxy Problem" by some workers in the field. A simple resolution to this question may not be forthcoming. The situation with the halos themselves, however, is more straightforward and, in this paper, we use linear perturbation theory to derive the halo mass function over the redshift range 0 less than or similar to z less than or similar to 10 for the R-h = ct universe. We use this predicted halo distribution to demonstrate that both its dependence on mass and its very weak dependence on redshift are compatible with the data. The difficulties with Lambda CDM may eventually be overcome with refinements to the underlying theory of star formation and galaxy evolution within the halos. For now, however, we demonstrate that the unexpected early formation of structure may also simply be due to an incorrect choice of the cosmology, rather than to yet unknown astrophysical issues associated with the condensation of mass fluctuations and subsequent galaxy formation.en_US
dc.description.sponsorshipChinese Academy of Sciences Visiting Professorships [2012T1J0011]; Chinese State Administration of Foreign Experts Affairs [GDJ20120491013]en_US
dc.language.isoenen_US
dc.publisherELSEVIER SCIENCE BVen_US
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S2212686418300220en_US
dc.rights© 2018 Elsevier B.V. All rights reserved.en_US
dc.subjectCosmological parametersen_US
dc.subjectCosmological observationsen_US
dc.subjectCosmological theoryen_US
dc.subjectDark energyen_US
dc.subjectGalaxiesen_US
dc.subjectLarge-scale structureen_US
dc.titleA cosmological solution to the Impossibly Early Galaxy Problemen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Physen_US
dc.contributor.departmentUniv Arizona, Dept Phys, Appl Math Programen_US
dc.contributor.departmentUniv Arizona, Dept Astronen_US
dc.identifier.journalPHYSICS OF THE DARK UNIVERSEen_US
dc.description.note24 month embargo; available online 26 March 2018en_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal accepted manuscripten_US
dc.source.journaltitlePhysics of the Dark Universe
dc.source.volume20
dc.source.beginpage65
dc.source.endpage71


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