Matches in SemOpenAlex for { <https://semopenalex.org/work/W4200633405> ?p ?o ?g. }
Showing items 1 to 82 of
82
with 100 items per page.
- W4200633405 abstract "The astrophysics of cosmic dawn, when star formation commenced in the first collapsed objects, is predicted to be revealed as spectral and spatial signatures in the cosmic radio background at long wavelengths. The sky-averaged redshifted 21-cm absorption line of neutral hydrogen is a probe of cosmic dawn. The line profile is determined by the evolving thermal state of the gas, radiation background, Lyman-$alpha$ radiation from stars scattering off cold primordial gas and the relative populations of the hyperfine spin levels in neutral hydrogen atoms. We report a radiometer measurement of the spectrum of the radio sky in the 55--85~MHz band, which shows that the profile found by Bowman et al. in data taken with the Experiment to Detect the Global Epoch of Reionization Signature (EDGES) low-band instrument is not of astrophysical origin; their best-fitting profile is rejected with 95.3% confidence. The profile was interpreted to be a signature of cosmic dawn; however, its amplitude was substantially higher than that predicted by standard cosmological models. Explanations for the amplitude of the profile included non-standard cosmology, additional mechanisms for cooling the baryons, perhaps via interactions with millicharged dark matter and an excess radio background at redshifts beyond 17. Our non-detection bears out earlier concerns and suggests that the profile found by Bowman et al. is not evidence for new astrophysics or non-standard cosmology." @default.
- W4200633405 created "2021-12-31" @default.
- W4200633405 creator A5001961708 @default.
- W4200633405 creator A5004332008 @default.
- W4200633405 creator A5020281811 @default.
- W4200633405 creator A5049706043 @default.
- W4200633405 creator A5053367181 @default.
- W4200633405 creator A5066179203 @default.
- W4200633405 creator A5071708034 @default.
- W4200633405 creator A5072426570 @default.
- W4200633405 creator A5090638017 @default.
- W4200633405 date "2021-12-13" @default.
- W4200633405 modified "2023-10-18" @default.
- W4200633405 title "On the detection of a cosmic dawn signal in the radio background" @default.
- W4200633405 doi "https://doi.org/10.48550/arxiv.2112.06778" @default.
- W4200633405 hasPublicationYear "2021" @default.
- W4200633405 type Work @default.
- W4200633405 citedByCount "0" @default.
- W4200633405 crossrefType "posted-content" @default.
- W4200633405 hasAuthorship W4200633405A5001961708 @default.
- W4200633405 hasAuthorship W4200633405A5004332008 @default.
- W4200633405 hasAuthorship W4200633405A5020281811 @default.
- W4200633405 hasAuthorship W4200633405A5049706043 @default.
- W4200633405 hasAuthorship W4200633405A5053367181 @default.
- W4200633405 hasAuthorship W4200633405A5066179203 @default.
- W4200633405 hasAuthorship W4200633405A5071708034 @default.
- W4200633405 hasAuthorship W4200633405A5072426570 @default.
- W4200633405 hasAuthorship W4200633405A5090638017 @default.
- W4200633405 hasBestOaLocation W42006334051 @default.
- W4200633405 hasConcept C121332964 @default.
- W4200633405 hasConcept C126320844 @default.
- W4200633405 hasConcept C1276947 @default.
- W4200633405 hasConcept C150846664 @default.
- W4200633405 hasConcept C153385146 @default.
- W4200633405 hasConcept C159249277 @default.
- W4200633405 hasConcept C164918935 @default.
- W4200633405 hasConcept C180205008 @default.
- W4200633405 hasConcept C187970030 @default.
- W4200633405 hasConcept C207297109 @default.
- W4200633405 hasConcept C26405456 @default.
- W4200633405 hasConcept C33024259 @default.
- W4200633405 hasConcept C44870925 @default.
- W4200633405 hasConcept C59375849 @default.
- W4200633405 hasConcept C62520636 @default.
- W4200633405 hasConcept C69672822 @default.
- W4200633405 hasConcept C85725439 @default.
- W4200633405 hasConcept C98444146 @default.
- W4200633405 hasConceptScore W4200633405C121332964 @default.
- W4200633405 hasConceptScore W4200633405C126320844 @default.
- W4200633405 hasConceptScore W4200633405C1276947 @default.
- W4200633405 hasConceptScore W4200633405C150846664 @default.
- W4200633405 hasConceptScore W4200633405C153385146 @default.
- W4200633405 hasConceptScore W4200633405C159249277 @default.
- W4200633405 hasConceptScore W4200633405C164918935 @default.
- W4200633405 hasConceptScore W4200633405C180205008 @default.
- W4200633405 hasConceptScore W4200633405C187970030 @default.
- W4200633405 hasConceptScore W4200633405C207297109 @default.
- W4200633405 hasConceptScore W4200633405C26405456 @default.
- W4200633405 hasConceptScore W4200633405C33024259 @default.
- W4200633405 hasConceptScore W4200633405C44870925 @default.
- W4200633405 hasConceptScore W4200633405C59375849 @default.
- W4200633405 hasConceptScore W4200633405C62520636 @default.
- W4200633405 hasConceptScore W4200633405C69672822 @default.
- W4200633405 hasConceptScore W4200633405C85725439 @default.
- W4200633405 hasConceptScore W4200633405C98444146 @default.
- W4200633405 hasLocation W42006334051 @default.
- W4200633405 hasLocation W42006334052 @default.
- W4200633405 hasOpenAccess W4200633405 @default.
- W4200633405 hasPrimaryLocation W42006334051 @default.
- W4200633405 hasRelatedWork W1961022487 @default.
- W4200633405 hasRelatedWork W1999562034 @default.
- W4200633405 hasRelatedWork W2012263400 @default.
- W4200633405 hasRelatedWork W2518649581 @default.
- W4200633405 hasRelatedWork W2898174274 @default.
- W4200633405 hasRelatedWork W2949404998 @default.
- W4200633405 hasRelatedWork W3009121361 @default.
- W4200633405 hasRelatedWork W3132197859 @default.
- W4200633405 hasRelatedWork W4221050099 @default.
- W4200633405 hasRelatedWork W4299587683 @default.
- W4200633405 isParatext "false" @default.
- W4200633405 isRetracted "false" @default.
- W4200633405 workType "article" @default.