Brahim Lamine
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View article: Phase Diffusion of Light Immersed In Quantum Tides: Open Quantum System Approach
Phase Diffusion of Light Immersed In Quantum Tides: Open Quantum System Approach Open
The interaction between quantum gravitational waves (GWs) and electromagnetic (EM) fields is investigated within the open quantum system formalism, where GWs are considered as a heat bath reservoir occupying a generic state $\hatρ_{\text{g…
Cosmological measurement of the gravitational constant <i>G</i> using the CMB, BAO, and BBN Open
Recent cosmological observations have provided numerous new observations with an increasing level of precision, ushering in an era of precision cosmology. The exquisite quality of these observations opens up new possibilities in terms of m…
View article: <i>Euclid</i> preparation
<i>Euclid</i> preparation Open
Future data provided by the Euclid mission will allow us to better understand the cosmic history of the Universe. A metric of its performance is the figure-of-merit (FoM) of dark energy, usually estimated with Fisher forecasts. The expecte…
View article: Cosmological measurement of the gravitational constant $G$ using the CMB, the BAO and the BBN
Cosmological measurement of the gravitational constant $G$ using the CMB, the BAO and the BBN Open
Recent cosmological observations have provided numerous new observations with increasing precision that have led to the era of precision cosmology. The exquisite quality of these observations opens new possibilities towards measuring funda…
View article: ΛCDM is alive and well
ΛCDM is alive and well Open
Despite its successes, the CDM model faces several tensions with recent cosmological data and their increased accuracy. The mismatch between the values of the Hubble constant obtained from {some} direct distance ladder measurements and fro…
View article: Revisiting van Citter-Zernike correlations in the presence of primordial gravitational waves
Revisiting van Citter-Zernike correlations in the presence of primordial gravitational waves Open
In this paper, we develop a quantum field theory framework to describe the interaction between a gravitational wave (GW) background and an electromagnetic (EM) field emitted from a distant celestial source, such as a star. We demonstrate t…
Sensing quantum nature of primordial gravitational waves using electromagnetic probes Open
Based on optical medium analogy, we establish a formalism to describe the interaction between an electromagnetic (EM) system with gravitational waves (GWs) background. After a full discussion on the classical treatment of the EM-GW interac…
View article: $Λ$CDM is alive and well
$Λ$CDM is alive and well Open
The $Λ$CDM model faces several tensions with recent cosmological data and their increased accuracy. The mismatch between the values of the Hubble constant $H_0$ obtained from direct distance ladder measurements and from the cosmic microwav…
View article: Can Dark Energy Emerge from a Varying G and Spacetime Geometry?
Can Dark Energy Emerge from a Varying G and Spacetime Geometry? Open
The accelerated expansion of the universe implies the existence of an energy contribution known as dark energy. Associated with the cosmological constant in the standard model of cosmology, the nature of this dark energy is still unknown. …
View article: Sensing Quantum Nature of Primordial Gravitational Waves Using Electromagnetic Probes
Sensing Quantum Nature of Primordial Gravitational Waves Using Electromagnetic Probes Open
Based on optical medium analogy, we establish a formalism to describe the interaction between an electromagnetic (EM) system with gravitational waves (GWs) background. After a full discussion on the classical treatment of the EM-GW interac…
Low-redshift tests of Newtonian cosmologies with a time-varying gravitational constant Open
In this work, we investigate Newtonian cosmologies with a time-varying gravitational constant, G(t). We examine whether such models can reproduce the low-redshift cosmological observations without a cosmological constant, or any other sort…
Time-dependent in Einstein’s equations as an alternative to the cosmological constant Open
In this work, we investigate cosmologies where the gravitational constant varies in time, with the aim of explaining the accelerated expansion without a cosmological constant. We achieve this by considering a phenomenological extension to …
Low-redshift tests of Newtonian cosmologies with a time-varying gravitational constant Open
In this work, we investigate Newtonian cosmologies with a time-varying gravitational constant, $G(t)$. We examine whether such models can reproduce the low-redshift cosmological observations without a cosmological constant, or any other so…
Phase velocity and light bending in a gravitational potential Open
In this paper we review the derivation of light bending obtained before the\ndiscovery of General Relativity (GR). It is intended for students learning GR\nor specialist that will find new lights and connexions on these historic\nderivatio…
Generalized dark matter model with the Euclid satellite Open
The concordance model in cosmology, $Λ$CDM, is able to fit the main cosmological observations with a high level of accuracy. However, around 95% of the energy content of the Universe within this framework remains still unknown. In this wor…
Is cosmic acceleration proven by local cosmological probes? Open
International audience
On the dark contents of the Universe: A Euclid survey approach Open
In this work we study the consequences of allowing non pressureless dark matter when determining dark energy constraints. We show that present-day dark energy constraints from low-redshift probes are extremely degraded when allowing this d…
Dark sectors of the Universe: A Euclid survey approach Open
In this paper we study the consequences of relaxing the hypothesis of the\npressureless nature of the dark matter component when determining constraints\non dark energy. To this aim we consider simple generalized dark matter models\nwith c…
View article: Power law cosmology model comparison with CMB scale information
Power law cosmology model comparison with CMB scale information Open
16 pages, 13 figures