High Energy Physics Seminar next Tuesday in Lagrange LH - Vafa

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_**__*

_/!!!Please note unusual venue!!!/_
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*Tuesday, 16 December *2025, at *16:00* - _*Lagrange Lecture 
Hall*_**-*https://indico.ictp.it/event/11237/*


Cumrun Vafa (Harvard University)


*“String Theory and the Fading Dark Sector"*
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_Abstract_

In this talk I explain how string theory leads to the unification of the 
dark sector:  The smallness of dark energy leads to the existence of 
dark matter.  Moreover I review a 2019 stringy model of the evolving 
dark sector, involving the prediction that the size of the extra 
dimensions of string theory cannot be stabilized and continue evolving 
together with the mass of the dark matter viewed as gravity waves in 
these extra dimensions. It turns out that this model anticipated the 
recent observations of DESI  team leading to similar significance over 
LCDM as the CPL parameterization, but without any phantom behavior.  
Moreover this leads to the prediction of a long range attractive force 
in the dark sector whose strength is 0.5% of the gravitational force.


To attend via _*Zoom*_, please *_register_* here:
https://zoom.us/meeting/register/huZibrVURrWK96LTW4Anhg