High Energy Physics Seminar next week (Cabass)

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINAR_ - https://indico.ictp.it/event/10639/**__*



*Thursday, 7 March* 2024, at *16:00*  - *LUIGI STASI SEMINAR ROOM/
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Giovanni Cabass (Institute Ruder Boskovic)

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*“BOSS Constraints on Massive Particles During Inflation: The 
Cosmological Collider”*

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_Abstract_

Massive spinning particles leave imprints on primordial non-Gaussianity 
via their coupling to the inflaton, even despite their exponential 
dilution during inflation. Improving on modern Cosmological Bootstrap 
techniques I present a search for these particles using the 
redshift-space galaxy power spectrum and bispectrum multipoles measured 
in BOSS, the first analysis of such kind with cosmological data. I focus 
on spin-0 particles in the principal series and constrain their 
couplings to the inflaton at varying speed of propagation and mass, 
marginalizing over the unknown inflaton self interactions. This is a 
fundamental step towards inflationary spectroscopy from cosmological 
observations, the ultimate link between the physics of the infinitely 
large and infinitely small.


This is a hybrid event. *To join via Zoom*:

Zoom link:https://zoom.us/j/91754463854

Meeting ID: 917 5446 3854

Password: 405079