Axions and the Dark Matter Problem | Prof. Frank Wilczek

Theoretical Seminar at The Department of Physics & Engineering, ITMO | 21 Apr 2021

Timecodes are below the abstract.

Prof. Frank Wilczek,
MIT, TDLI & WQC, ASU AND Stockholm University

Title: "Axions and the Dark Matter Problem"

Abstract: The existence of axions is suggested by theoretical ideas that would bring our understanding of (approximate) time reversal symmetry to a new level of perfection. Their predicted properties are remarkably definite, but quite unusual. If axions exist, they plausibly supply the cold dark matter that cosmologists require. Experiments to confirm or refute these ideas are challenging, but promising approaches have been proposed, and many physicists are taking up the search.

The first talk by Prof. Frank Wilczek
0:00:00 Start
0:01:48 Introduction
0:03:10 Outline
0:06:40 Why fundamental physics need axions
0:20:10 Axions as particles
0:36:50 Why cosmology needs dark matter
0:46:21 How axions make dark matter
0:53:14 Axions and astrophysics
1:00:05 Axions and terrestrial physics
1:01:37 Axion haloscopes
1:14:10 Axions (generalization)
1:18:58 Questions and discussion at the end of the first talk

The second talk by Dr. Sid Morampudi "Detecting Axions with Metamaterials"
1:44:54 Introduction
1:45:44 Axions can convert to photons
1:46:17 Large density of axions
1:47:29 Maxwell's equations modified by axions
1:49:30 Inverse Primakoff effect
1:50:19 Finding axions through cavity resonances
1:51:22 Signal
1:52:04 Limitations of cavities
1:53:01 Search space
1:54:30 Metamaterials can help us overcome cavity limit
1:55:31 Experimental setup
1:56:01 Projected reach
1:56:41 Setup
1:57:17 Fields with axion current
1:58:55 Partial wishlist
1:59:44 Questions and discussion at the end of the second talk

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