Observed parity-odd CMB temperature bispectrum

Abstract

Parity-odd non-Gaussianities create a variety of temperature bispectra in the cosmic microwave background (CMB), defined in the domain: ${\ell }_1+{\ell }_2+{\ell }_3=\mathrm{odd}$. These models are yet unconstrained in the literature, that so far focused exclusively on the more common parity-even scenarios. In this work, we provide the first experimental constraints on parity-odd bispectrum signals in WMAP 9-year temperature data, using a separable modal parity-odd estimator. Comparing theoretical bispectrum templates to the observed bispectrum, we place constraints on the so-called nonlineality parameters of parity-odd tensor non-Gaussianities predicted by several Early Universe models. Our technique also generates a model-independent, smoothed reconstruction of the bispectrum of the data for parity-odd configurations.

17 pages, 4 figures, 1 table. Accepted for publication in JCAP

References in corpus (6)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
• Fast Estimator of Primordial Non-Gaussianity from Temperature and Polarization Anisotropies in the Cosmic Microwave Background
• The Odd-Parity CMB Bispectrum
• Analytic formulae of the CMB bispectra generated from non-Gaussianity in the tensor and vector perturbations

Cited by in corpus (2)

• Parity violation in the CMB trispectrum from the scalar sector
• CMB bounds on tensor-scalar-scalar inflationary correlations