Trispectrum of 21-cm background anisotropies as a probe of primordial non-Gaussianity
Journal Article
·
· Physical Review. D, Particles Fields
- Center for Cosmology, Department of Physics and Astronomy, University of California, 4129 Frederick Reines Hall, Irvine, CA 92697 (United States)
- Theoretical Astrophysics, California Institute of Technology, Mail Code 103-33 Pasadena, CA 91125 (United States)
- Dipartimento di Fisica 'G. Marconi' and INFN, sezione di Roma, Universita di Roma 'La Sapienza', Piazzale Aldo Moro 5, 00185, Roma (Italy)
The 21-cm anisotropies from the neutral hydrogen distribution prior to the era of reionization are a sensitive probe of primordial non-Gaussianity. Unlike the case with cosmic microwave background, 21-cm anisotropies provide multi-redshift information with frequency selection and are not damped at arcminute angular scales. We discuss the angular trispectrum of the 21-cm background anisotropies and discuss how the trispectrum signal generated by the primordial non-Gaussianity can be measured with the three-to-one correlator and the corresponding angular power spectrum. We also discuss the separation of primordial non-Gaussian information in the trispectrum with that generated by the subsequent nonlinear gravitational evolution of the density field. While with the angular bispectrum of 21-cm anisotropies one can limit the second-order corrections to the primordial fluctuations below f{sub NL}{approx}1, using the trispectrum information we suggest that the third-order coupling term, f{sub 2} or g{sub NL}, can be constrained to be around 10 with future 21-cm observations over the redshift interval of 50 to 100.
- OSTI ID:
- 21204966
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 10 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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