No evidence for primordial hotspots in Planck polarization data leads to improved bounds on inflationary particle production couplings for light particles.
Maldacena, Non-gaussian features of primordial fluctu- ations in single field inflationary models, Journal of High Energy Physics2003, 013–013 (2003)
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Constraining Inflationary Particle Production with CMB Polarization
No evidence for primordial hotspots in Planck polarization data leads to improved bounds on inflationary particle production couplings for light particles.