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
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
Recently, axionlike particle search has received renewed interest. In particular, several groups have started "light shining through a wall" experiments based on magnetic field and laser both ...continuous, which is very demanding in terms of detector background. We present here the 2sigma limits obtained so far with our novel setup consisting of a pulsed magnetic field and a pulsed laser. In particular, we have found that the axionlike particle two photons inverse coupling constant M is >8 x 10{5} GeV provided that the particle mass m{a} approximately 1 meV. Our results definitively invalidate the axion interpretation of the original PVLAS optical measurements with a confidence level greater than 99.9%.
.
In this paper, we describe in detail the BMV (
Biréfringence Magnétique du Vide
) experiment, a novel apparatus to study the propagation of light in a transverse magnetic field. It is based on a ...very high finesse Fabry-Perot cavity and on pulsed magnets specially designed for this purpose. We justify our technical choices and we present the current status and perspectives.
In this Letter we describe our novel photon regeneration experiment for the axionlike particle search using an x-ray beam with a photon energy of 50.2 and 90.7 keV, two superconducting magnets of 3 ...T, and a Ge detector with a high quantum efficiency. A counting rate of regenerated photons compatible with zero has been measured. The corresponding limits on the pseudoscalar axionlike particle-two-photon coupling constant is obtained as a function of the particle mass. Our setup widens the energy window of purely terrestrial experiments devoted to the axionlike particle search by coupling to two photons. It also opens a new domain of experimental investigation of photon propagation in magnetic fields.
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