Speaker
Description
We investigate the non-Gaussian three-point cross-correlation function between the primordial curvature perturbation and the primordial magnetic field generated via direct gauge-inflaton coupling, for generic non-standard initial vacua. Among the possible triangular configurations of the resulting cross-bispectrum, we find that the squeezed limit leads to a product form decomposition in terms of the scalar and magnetic power spectra, which is a general result independent of any specific choice of the non-Bunch-Davies initial states. We subsequently explore the prospects of such a primordial cross-correlator in sourcing a detectable CMB correlation between $\mu$-type spectral distortions and temperature anisotropies prior to recombination. Our forecast analysis for various next-generation CMB missions reveals that compared to the standard Bunch-Davies case, the signal-to-noise ratio (SNR) of the $\mu T$ cross-power spectrum can be enhanced significantly for specific combinations of the Bogolyubov coefficients, which correspond to particular choices of initial vacua.
| arkobhaumik12@gmail.com | |
| Affiliation | Indian Statistical Institute, Kolkata |
