Jean-Pierre Petit

Laboratoire d’Astrophysique de Marseille

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Hicham Zejli

Château Gombert

Gilles d'Agostini

Centre National de la Recherche Scientifique

Gilles Dagostini

Manaty (France)

N. Debergh

Haute École Charlemagne

Florent Margnat

Université de Poitiers

Y. Wouters

Centre National de la Recherche Scientifique

A. Galerie

Science et Ingénierie des Matériaux et Procédés

G. Monnet

Australian Astronomical Observatory

J. Geffray

Lambda

PIERRE MIDY

Université Paris-Saclay

Cooperative Institutions

Centre National de la Recherche Scientifique

Science et Ingénierie des Matériaux et Procédés

Institut polytechnique de Grenoble

Université Grenoble Alpes

Inserm

Université Joseph Fourier

Manaty (France)

Laboratoire de Chimie

Université Paris-Saclay

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

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Paul Couteau received the Prix Henri de Parville.

CRASB (1980)

Jean-Pierre Petit M. Billiotte M. Viton

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Rate of growth of electrothermal instability and critical Hall parameter in linear generators with a closed cycle when the electron mobility is variable

Jean-Pierre Petit J. Valensi

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SCALE INVARIANT COSMOLOGY II: EXTRA DIMENSIONS AND THE REDSHIFT OF DISTANT SUPERNOVAE

International Journal of Modern Physics D (2003)

Jean-Pierre Petit PIERRE MIDY

The cosmological problem is studied here starting from a metric with a variable scale factor for time and two different ones for space, noted R for ordinary space and S for the extra dimensions. Once R has been obtained from physical principles, one is left for S with a differential equation which can be solved through Lie group analysis and dynamical systems theory, and a frequent use of computer algebra has been made in the ensuing calculations. This leads to a good agreement with the recent observational results relating to distant supernovae. However, the solution obtained for S is particularly simple if spacetime has a dimension at least equal to ten, a result to be compared with those given by superstring or M theories.

Scale factor (cosmology)

Scale invariance

10.1142/s0218271803003232

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Challenging the Standard Model

Jean-Pierre Petit Hicham Zejli

10.5281/zenodo.11350718

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Strontium Ranelate Decreases Receptor Activator of Nuclear Factor-κB Ligand-Induced Osteoclastic Differentiation In Vitro: Involvement of the Calcium-Sensing Receptor

Molecular Pharmacology (2010)

Axelle Caudrillier Anne‐Sophie Hurtel‐Lemaire Alice Wattel Fabienne Cournarie Corinne Godin

Strontium ranelate exerts both an anticatabolic and an anabolic effect on bone cells. To further investigate the mechanism by which strontium ranelate inhibits bone resorption, the effects of varying concentrations of Sr_o²⁺ on osteoclastic differentiation were studied using RAW 264.7 cells and peripheral blood monocytic cells (PBMCs). We report that increasing concentrations of Sr_o²⁺ down-regulate osteoclastic differentiation and tartrate-resistant acid phosphatase activity, leading to inhibition of bone resorption (−48% when PBMCs were cultured for 14 days in the presence of 2 mM Sr_o²⁺). Using a dominant-negative form of the calcium-sensing receptor (CaR) and a small interfering RNA approach, we provide evidences that the inhibition of osteoclast differentiation by Sr_o²⁺ is mediated by stimulation of the CaR. Moreover, our results suggest that the effects of Sr_o²⁺ on osteoclasts are, at least in part, mediated by inhibition of the receptor activator of nuclear factor-κB ligand (RANKL)-induced nuclear translocation of nuclear factor-κB and activator protein-1 in the early stages of osteoclastic differentiation. In conclusion, our data indicate that Sr²⁺ directly inhibits the formation of mature osteoclasts through down-regulation of RANKL-induced osteoclast differentiation and decreases osteoclast differentiation through the activation of the CaR.

Strontium ranelate

10.1124/mol.109.063347

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Zwillingsuniversen durch Allgemeine Relativitätstheorie bestätigt

HAL (Le Centre pour la Communication Scientifique Directe) (2021)

Patrick Marquet Jean-Pierre Petit

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A bimetric cosmological model based on Andreï Sakharov’s twin universe approach

The European Physical Journal C (2024)

Jean-Pierre Petit Florent Margnat Hicham Zejli

Abstract The standard cosmological model, based on Cold Dark Matter and Dark Energy ( $$\varLambda $$ Λ CDM), faces several challenges. Among these is the need to adjust the scenario to account for the presence of vast voids in the large-scale structure of the universe, as well as the early formation of the first stars and galaxies. Additionally, the observed matter–antimatter asymmetry in the universe remains an unresolved issue. To address this latter question, Andrei Sakharov proposed a twin universe model in 1967. Building upon this idea and introducing interactions between these two universe sheets through a bimetric model, we propose an alternative interpretation of the large-scale structure of the universe, including its voids and the acceleration of cosmic expansion.

10.1140/epjc/s10052-024-13569-w

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Study of symmetries through the action on Torsors of the Janus Symplectic Group

Reviews in Mathematical Physics (2024)

Jean-Pierre Petit Hicham Zejli

In this paper, we focus on the Janus symplectic group. We explore its various symmetries and its action on the elements of the dual of its Lie algebra, called torsors. Special attention is given to the charge symmetry, which highlights the matter–antimatter duality within both sets of components.

Symplectic group

10.1142/s0129055x24500545

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CALCUL DES COEFFICIENTS DE TRANSPORT D'UN PLASMA PARTIELLEMENT IONISE

Le Journal de Physique Colloques (1971)

Jean-Pierre Petit

10.1051/jphyscol:19715113

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Criteres de sens de mouvement sur les miroirs de failles en roches non calcaires

BSGF – Earth Sciences Bulletin (1983)

Jean-Pierre Petit F. Proust P. Tapponnier

10.2113/gssgfbull.s7-xxv.4.589

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Citations (50)