Physics Colloquia

Fall 2016 (usually Fridays 2:00 PM in SE 319)

Date Speaker Title
Jan 13 Jim McGuire Numbers That come from Nowhere
Jan 27 Maurizio Giannotti  Astrophysical Anomalies and Axions: the physics potential of the International Axion Observatory

 

Colloquium Abstracts

Numbers That come from Nowhere

James McGuire  (FAU), Jan 13

In QED Feynman wrote: "There is a most profound and beautiful question associated with the observed coupling constant, e, the amplitude for a real electron to emit or absorb a real photon. It is a simple number that has been experimentally determined to be close to 0.08542455. (My physicist friends won't recognize this number, because they like to remember it as the inverse of its square: about 137.03597 with about an uncertainty of about 2 in the last decimal place. It has been a mystery ever since it was discovered more than fifty years ago, and all good theoretical physicists put this number up on their wall and worry about it.)" I have never seen it written on anvone's wall except Feynman's. This talk will be a discussion of this and other numbers that come from nowhere,

 

Astrophysical Anomalies and Axions: the physics potential of the International Axion Observatory

Maurizio Giannotti (Barry U.), Jan 27

I will give an update on the anomalies observed in the cooling of several stellar systems and on the interpretation in terms of axions and axion like particles (ALPs). I will show that the relevant region in the axion and ALP parameter space hinted by these anomalies can be probed by the next generation of axion detectors, in particular by the International Axion Observatory (IAXO).