1. RRI Digital Repository
  2. 04. Astronomy and Astrophysics
  3. Research Papers (A&A)
Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/7605
Full metadata record
DC FieldValueLanguage
dc.contributor.authorBrahma, Nirmalya-
dc.contributor.authorSethi, S.K.-
dc.contributor.authorSista, Shivnag-
dc.date.accessioned2020-12-30T08:40:24Z-
dc.date.available2020-12-30T08:40:24Z-
dc.date.issued2020-12-
dc.identifier.citationJournal of Cosmology and Astroparticle Physics, 2020, Article.034,en_US
dc.identifier.issn1475-7516 (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/7605-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en_US
dc.description.abstractWe study the possibility of explaining the recent EDGES detection by an energy injection in the pre-recombination era. Our aim is to show that the residue of this energy injection could give the resultant increase in the energy density at frequencies xe h =(kT) ' 10􀀀3, which is needed to explain the EDGES result. We consider two models of energy injection: Gaussian pro le with a xed redshift of injection and radiative decay of a nonrelativistic particle. We show that the energy injection should occur in the redshift range z . 4 103 to prevent free-free processes from thermalizing the injected energy. The injected energy should be nearly 200{1000 times the CMB intensity at xe ' 10􀀀3 to obtain the requisite residue. A large fraction of the injected energy gets thermalized and therefore distorts the CMB spectrum. We compute CMB spectral distortion for both the models and show that the fractional change in CMB energy density, CMB= CMB ' 10􀀀6, which might be detectable with the proposed experiment PIXIE. We also outline the implication of our proposed scenario for CMB anisotropies.en_US
dc.language.isoenen_US
dc.publisherIOP Publishingen_US
dc.relation.urihttps://doi.org/10.1088/1475-7516/2020/12/034en_US
dc.relation.urihttps://arxiv.org/abs/2007.06417en_US
dc.rights2020 IOP Publishing Ltd and Sissa Medialaben_US
dc.subjectCMBR theoryen_US
dc.subjectphysics of the early universeen_US
dc.subjectreionizationen_US
dc.titleEnergy injection in pre-recombination era and EDGES detectionen_US
dc.typeArticleen_US
Appears in Collections:Research Papers (A&A)

Files in This Item:
File Description SizeFormat 
2020_J_Cosmol_Astropart_Phys_No.12_Article No.034.pdf
  Restricted Access		Restricted Access1.52 MBAdobe PDFView/Open Request a copy
Show simple item record


Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.