Primordial trispectra and CMB spectral distortions

Journal Article · Tue Mar 01 04:00:00 EST 2016 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2016/03/029· OSTI ID:22524942

Bartolo, Nicola; Liguori, Michele ^[1]; Shiraishi, Maresuke ^[2]

---

1. Dipartimento di Fisica e Astronomia ''G. Galilei'', Università degli Studi di Padova, via Marzolo 8, I-35131, Padova (Italy)
2. Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), UTIAS, The University of Tokyo, Chiba, 277-8583 (Japan)

We study the TTμ bispectrum, generated by correlations between Cosmic Microwave Background temperature (T) anisotropies and chemical potential (μ) distortions, and we analyze its dependence on primordial local trispectrum parameters g{sub NL} and τ{sub NL}. We cross-check our results by comparing the full bispectrum calculation with the expectations from a general physical argument, based on predicting the shape of μ-T correlations from the couplings between short and long perturbation modes induced by primordial non-Gaussianity. We show that both g{sub NL} and τ{sub NL}-parts of the primordial trispectrum source a non-vanishing TTμ signal, contrary to the μμ auto-correlation function, which is sensitive only to the τ{sub NL}-component. A simple Fisher matrix-based forecast shows that a futuristic, cosmic-variance dominated experiment could in principle detect g{sub NL} ∼ 0.4 and τ{sub NL} ∼ 40 using TTμ.

• OSTI ID: 22524942
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 03 Vol. 2016; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
COMPARATIVE EVALUATIONS
CORRELATION FUNCTIONS
CORRELATIONS
COSMOLOGY
COUPLING
DISTURBANCES
ENERGY SPECTRA
POTENTIALS
RELICT RADIATION
SIGNALS