5 papers
The emergent Big Bang scenario
Justin C. Feng, Shinji Mukohyama, Jean-Philippe Uzan
This paper proposes a new avenue for understanding the cosmological singularity. The standard cosmological model contains a generic initial singularity usually referred to as the {…
Fundamental constants: from measurement to the universe, a window on gravitation and cosmology
Jean-Philippe Uzan
Fundamental constants are a cornerstone of the physical laws. Any constant varying in space and/or time would signal a violation of local position invariance and be associated with…
Scalar-tensor theories at different scales: averaging the scalar sector
Jean-Philippe Uzan, Hugo Lévy
This article investigates the averaging of a scalar degree of freedom that couples universally to matter. It quantifies the approximation of smoothing the matter distribution befor…
Testing screened scalar-tensor theories of gravity with atomic clocks
Hugo Lévy, Jean-Philippe Uzan
In any scalar-tensor theory of gravity exhibiting a screening mechanism, the fifth force mediated by the scalar field is dynamically suppressed at sub-Solar system scales, allowing…
Precision big bang nucleosynthesis with improved Helium-4 predictions
Cyril Pitrou, Alain Coc, Jean-Philippe Uzan +1
Primordial nucleosynthesis is one of the three historical evidences for the big bang model, together with the expansion of the universe and the cosmic microwave background. Now tha…