In this report we show that a vacuum is a nonlinear optical medium and discuss what the optical phenomena are that should exist in the framework of the standard model of particle physics. We pay ...special attention to the low energy limit. The predicted effects for photons of energy smaller than the electron rest mass are of such a level that none have yet been observed experimentally. Progress in field sources and related techniques seem to indicate that in a few years vacuum nonlinear optics will be accessible to human investigation.
Limits on nonlinear electrodynamics Fouché, M.; Battesti, R.; Rizzo, C.
Physical review. D,
05/2016, Letnik:
93, Številka:
9
Journal Article
Recenzirano
Odprti dostop
In this paper we set a framework in which experiments whose goal is to test QED predictions can be used in a more general way to test nonlinear electrodynamics (NLED) which contains low-energy QED as ...a special case. We review some of these experiments and we establish limits on the different free parameters by generalizing QED predictions in the framework of NLED. We finally discuss the implications of these limits on bound systems and isolated charged particles for which QED has been widely and successfully tested.
QED vacuum can be polarized and magnetized by an external electromagnetic field, therefore acting as a birefringent medium. This effect has not yet been measured. In this paper, after having recalled ...the main facts concerning vacuum magnetic birefringence polarimetry detection method and the related noise sources, we detail our Monte Carlo simulation of a pulsed magnetic field data run. Our Monte Carlo results are optimized to match BMV experiment 2014 data. We show that our Monte Carlo approach can reproduce experimental results giving an important insight into the systematic effects limiting experiment sensitivity.
Graphic abstract
On the positronium g-factor Agil, J.; Battesti, R.; Rizzo, C. ...
The European physical journal. D, Atomic, molecular, and optical physics,
11/2023, Letnik:
77, Številka:
11
Journal Article
Recenzirano
Odprti dostop
In this letter, we recall the main facts concerning the g-factor of positronium and we show how the value of the g-factor of the positronium is important. Taking it better into consideration may ...provide a solution to the reported discrepancy between QED theory and experiments concerning the hyperfine splitting of the fundamental level of the positronium. We also give the only experimental value that existing experiments can provide,
g
Ps
=
2.0023
±
0.0012
at
3
σ
.
Graphic abstract
Vacuum birefringence experiments: optical noise Agil, J.; Battesti, R.; Rizzo, C.
The European physical journal. D, Atomic, molecular, and optical physics,
2022/10, Letnik:
76, Številka:
10
Journal Article
Recenzirano
In this paper, in the framework of the BMV (
Biréfringence Magnétique du Vide
) project, whose goal is the measurement of the vacuum linear magnetic birefringence, we study the optical noise ...affecting these kinds of experiments by detailing its sources, and we perform experimental measurements of all of them, clarifying that the limiting noise is a birefringence one.
Graphic Abstract
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