[math-ias] Announcement: IAS HET Seminar - Monday, March 27 - 2:30 PM - Bloomberg Lecture Hall & Zoom - "The Cosmic Neutrino Background (CνB): Its Distribution on the Surface of the Earth and its Manipulation by Laboratory-Scale Diffraction Gratings" - Savas Dimopoulos, Stanford

[Lisa Fleischer]

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_*Monday**, March 27, 2023 - IAS High Energy Theory Seminar **_
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"The Cosmic Neutrino Background (CνB): Its Distribution on the Surface 
of the Earth and its Manipulation by Laboratory-Scale Diffraction Gratings"

Location: Bloomberg Lecture Hall (IAS) & Zoom

Zoom Link: 
https://theias.zoom.us/j/84116605050?pwd=VHV6VkRUM3hkM2dFSlo2QWJiUWtPdz09

Time: 2:30 PM

Speaker: Savas Dimopoulos, SITP, Stanford University

*Abstract: *The CνB is a cosmological relic analogous to the CMB, and 
contains information about the universe before it was one-second-old. 
Reflection of relic neutrinos from the surface of the Earth creates a 
significant local neutrino-antineutrino asymmetry in a shell seven 
meters thick around the Earth's surface. This asymmetry far exceeds the 
expected primordial lepton asymmetry. The resulting gradient of the net 
neutrino density evades the forty-year-old “no-go” theorem on the 
vanishing of  O(G_Fermi) neutrino forces on matter.

These forces can be further enhanced by using 1-100 meter structures 
with shape reminiscent of a sea-urchin: they consist of rods of width w 
and length L>>w periodically arranged on the surface of the sphere of 
radius R~L. Such a structure functions as a diffraction grating for 
relic neutrinos and the induced neutrino-antineutrino asymmetry at its 
center may point to a new class of experiments to detect the CνB in a 
laboratory setting. At the same time, such structures can be used to 
similarly manipulate dark matter.

--------------------- Lisa Fleischer Academic Assistant School of 
Natural Sciences Institute for Advanced Study 1 Einstein Drive 
Princeton, NJ 08540 lisa at ias.edu



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