Massive field excitations during ? ?the inflationary era, imprinted on cosmological correlation ? ?functions, can provide us with a unique opportunity to probe heavy ? ?degrees of freedom far beyond the reach of terrestrial colliders. In ? ?the simplest inflationary models, any such cosmological collider ? ?signal is exponentially suppressed for particles much heavier than ? ?the inflationary Hubble scale, limiting the potential reach of such ? ?new physics searches. In this talk, I will discuss how primordial ? ?features on the inflationary landscape can naturally excite very ? ?heavy modes. Respecting the current bounds on power spectrum, I will ? ?show that this mechanism can extend the reach of the cosmological ? ?collider by one or two orders of magnitude. This can bring various ? ?well-motivated high-scale models, such as GUTs, within the ? ?observational window for various near-term surveys.

Bio:?Soubhik grew ? ?up near Kolkata, India where he also completed his undergrad. ? ?Subsequently he moved to the US for graduate study. After finishing ? ?his Ph.D. from University of Maryland in 2020, he moved to UC ? ?Berkeley and LBL where he is now a postdoc. He likes to bike and hike.