Entanglement masquerading in the CMB

The simplest single-field inflation models capture all the relevant contributions to patterns in Cosmic Microwave Background (CMB) observed today. A key assumption these is that quantum inflationary fluctuations source such are generated by a particular state -- Bunch-Davies (BD) state. While this well-motivated choice from theoretical perspective, question arises of whether current data can rule out other, also well motivated, choices states. In particular, as we previously demonstrated arXiv:2104.13410 [hep-th], entanglement naturally and inevitably dynamically during given presence "rolling" spectator scalar field resulting entangled will yield primordial power spectrum with potentially measurable deviations compared canonical BD result. For work developed perturbative framework allow systematic exploration constraints on (or detection of) states Planck CMB using Monte Carlo techniques. We have found most accessible our consistent data. One would expand greater variety order saturate more systematically explore any preferences may among different possibilities.