REMINDER - High Energy Physics Seminars TODAY (Raju)

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_**__*


*/!!! Please note unusual venue !!!/*

Thursday, 22 May 2025, at*16:00*  - *Euler Lecture Hall* - 
https://indico.ictp.it/event/11033/



Suvrat Raju (Tata Institute of Fundamental Research, ICTS)


* “Cosmological Correlators in Gravitationally-Constrained de Sitter 
States"*
_
__Abstract_
We study perturbative cosmological correlators in wavefunctionals which 
solve the Wheeler-DeWitt equation in asymptotically de Sitter spacetimes 
and were constructed in arxiv:2303.16315. Even in the G_N \rightarrow 0 
limit, it is necessary to impose the gravitational Gauss law, which 
forces states to be de Sitter invariant. We set up Feynman rules for 
computing cosmological correlators in such states. We enumerate some 
necessary (but not sufficient) conditions that must be imposed on states 
and observables to avoid group-volume divergences. We provide sample 
computations to show that such cosmological correlators can be 
nontrivial even when the Hartle-Hawking wavefunction is Gaussian. We 
show that, in the presence of a heavy background state, it is possible 
to construct a class of state-dependent relational observables that 
approximate correlators in the Hartle-Hawking state.



To join via Zoom (please note audio/video may have lower resolution than 
usual):
https://zoom.us/j/97510670835

Meeting ID  975 1067 0835

Passcode: 216259