Reminder - TODAY Joint ICTP-SISSA-UNITS Physics Seminars (Weiner and Baryakhtar) @ICTP (and via Zoom)

[HECAP - Margherita Di Giovannantonio]

*_Joint ICTP-SISSA-UniTS Seminars_**__*



*Wednesday, 03 April* 2024 - *Luigi Stasi Seminar Room (and Zoom)
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*14:30 - https://indico.ictp.it/event/10654/
<https://indico.ictp.it/event/10654/> *


Neal Weiner (New York University)


*"Nu Physics in the LCDM Desert "*

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_Abstract_
The standard model has a gap in physics scales below approximately 1 
MeV. Current and upcoming cosmological observations will probe the 
nature of the universe when it was at these temperatures. An important 
consideration is what sorts of new physics could appear in this range 
which would have observable consequences. We will discuss the 
possibility that neutrino oscillations might equilibrate a new sector 
and consider how naturally that might occur. Such scenarios may have 
implications for existing cosmological tensions, such as the Hubble 
tension and the S8 tension, which we will discuss.



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*16:00 /- /*https://indico.ictp.it/event/10655/*/
/* <https://indico.ictp.it/event/10653/>

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Masha Baryakhtar (University of Washington)

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*"Cosmology with Varying Constants: Signatures of Hyperlight Scalars "*

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_Abstract*/
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Theories that seek to explain the outstanding puzzles of the Standard 
Model of particle physics often predict new, light, feebly-interacting 
particles. In this talk, I will outline a range of novel search 
strategies that are required for their discovery, from the laboratory to 
the sky. I will focus on the early universe, where even a small trace of 
hyperlight scalar fields can be observed through the power of the cosmic 
microwave background. Scalar fields which interact with photons and 
electrons provide concrete microphysical models of varying-constant 
scenarios, invoked as a potential resolution of discrepant measurements 
of the universe's expansion rate. I will discuss cosmological and 
laboratory constraints on these models, including measurements of quasar 
absorption lines, abundances of light elements, and universality of free 
fall, as well as their dynamics and signatures in the early universe and 
their effect on the cosmic microwave background and inferred 
cosmological parameters. _*/
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*To join via Zoom *(valid for *both seminars*):

Zoom link:https://zoom.us/j/99139964641

Meeting ID:  991 3996 4641

Password: 866404