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Diffusion in Phase Space as a Tool to Assess Variability of Vertical Centre-of-Mass Motion during Long-Range Walking
06 février 2023,
- CeREF Santé
- CeREF Technique
,
- Article scientifique
Article scientifique
When a Hamiltonian system undergoes a stochastic, time-dependent anharmonic perturbation,
the values of its adiabatic invariants as a function of time follow a distribution whose shape
obeys a Fokker–Planck equation. The effective dynamics of the body’s centre-of-mass during human
walking is expected to represent such a stochastically perturbed dynamical system. By studying, in
phase space, the ...
ZN-balls: Solitons from ZN-symmetric scalar field theory
28 novembre 2022,
- CeREF Technique
,
- Article scientifique
Article scientifique
We discuss the conditions under which static, finite-energy, configurations of a complex scalar field ϕ
with constant phase and spherically-symmetric norm exist in a potential of the form V(ϕ*ϕ, ϕ^N, ϕ^*N)
with N ∈ N and N ≥ 2, i.e., a potential with a ZN-symmetry. Such configurations are called ZN-balls. We
build explicit solutions in (3 + 1)-dimensions from a model mimicking effective field ...
Compte rendu de : "Mee (Nicholas), Celestial Tapestry : The Warp and Weft of Art and Mathematics"
2022,
- HE Louvain en Hainaut
,
- Rapport
Rapport
Il s'agit du compte rendu du livre : "Mee (Nicholas), Celestial Tapestry : The Warp and Weft of Art and Mathematics. – Ox ford : Oxford University Press, 2020. – 325 p. – 1 vol. broché de 20 × 13 cm. – 16,99 £. – isbn 978-0-19-885195-0".
ZN-balls: Existence and application to Yang-Mills plasma
02 juin 2022,
- CeREF Technique
,
- Autre
Autre
Conférence donnée à "Exact solutions in classical field theory: Solitons, black holes and bosons stars – Workshop en l’honneur de Yves Brihaye", UMONS, 2-3 juin 2022.
https://web.umons.ac.be/pucg/event/workshop-en-lhonneur-de-yves-brihaye/
Many-Quark Interactions: Large-N Scaling and Contribution to Baryon Masses
31 mai 2022,
- CeREF Technique
,
- Article scientifique
Article scientifique
Starting from an effective Hamiltonian modeling, of a baryon made of N identical quarks in
the large-N approach of QCD, we obtain analytical formulas, allowing to estimate the contributions
of multiquark interactions to the baryon mass. The cases of vanishing (mass spectrum) and nonvanishing
(baryon melting) temperatures are treated.
Quand soixante étudiants manipulent pour appréhender l'univers des grandeurs et ses aspects didactiques...
juin 2019,
- HE Louvain en Hainaut
,
- Acte de conférence ou de colloque
Acte de conférence ou de colloque
Nous présentons un dispositif avec artefacts vécu par les étudiants en début de formation d’instituteur primaire (Belgique). L’ambition principale de ce dispositif est de parcourir l’ensemble des aspects de l’apprentissage d’une grandeur pour les enfants de 3 à 12 ans, en mettant l’accent sur l’importance de la pratique des gestes de mesurage et l’intérêt de l’élaboration de représentations mentales, ...
Motor strategies and adiabatic invariants: The case of rhythmic motion in parabolic flights
05 août 2021,
- CeREF Technique
,
- Article scientifique
Article scientifique
The role of gravity in human motor control is at the same time obvious and difficult to isolate. It can be
assessed by performing experiments in variable gravity. We propose that adiabatic invariant theory may be used
to reveal nearly conserved quantities in human voluntary rhythmic motion, an individual being seen as a complex
time-dependent dynamical system with bounded motion in phase space. ...
A First-Quantized Model for Unparticles and Gauge Theories around Conformal Window
02 décembre 2021,
- CeREF Technique
,
- Article scientifique
Article scientifique
We first quantize an action proposed by Casalbuoni and Gomis in 2014 that describes two massless relativistic scalar particles interacting via a conformally invariant potential. The spectrum is a continuum of massive states that may be interpreted as unparticles. We then obtain in a similar way the mass operator for a deformed action in which two terms are introduced that break the conformal symmetry: ...
Compte rendu de Sabine Hossenfelder : «Lost in Maths : comment la beauté égare la physique»
01 janvier 2020,
- HE Louvain en Hainaut
,
- Article scientifique
Article scientifique
Compte rendu de Sabine Hossenfelder : «Lost in Maths : comment la beauté égare la physique»
Compte rendu de Stéphane Collion : «Voyage dans les mathématiques de l'espace-temps : trous noirs, big-bang, singularités»
01 mai 2019,
- HE Louvain en Hainaut
,
- Rapport
Rapport
Compte rendu de Stéphane Collion : «Voyage dans les mathématiques de l'espace-temps : trous noirs, big-bang, singularités»