Euclid Theory Working Group and Euclid IST:forecast Meeting

Liste des Contributions

3. Double curvatures model using Fisher spectroscopic forecasts for Euclid

Safir Yahia-Cherif (IRAP)

TWG talk

One of the main prediction of inflationary cosmology is the spatial flatness of the universe. The combination of observed CMB fluctuations with SNIa observations and BAO leads to a prediction of the spatial curvature parameter lower than 1e-4. Observations have shown the acceleration of the expansion of the universe revealing the existence of two dark component : the dark matter and the dark...

5. Generalized dark matter model with the Euclid satellite

Isaac Tutusaus (IRAP (Toulouse))

TWG talk

In a LCDM framework, dark energy may be described as a fluid with equation of state parameter equal to -1, and sound velocity equal to 1, while dark matter may be described as a fluid with null pressure and null sound velocity. In this talk we will focus on dark matter allowing a more general fluid description. We will first briefly provide the theoretical framework for this phenomenological...

11. Growth index implementations for different parameterizations of modified gravity

Dr Ziad Sakr (IRAP, USJ)

TWG talk

The growth rate of linear perturbations is well described using a simple parametric function $f=\Omega_m^\gamma$, where a detection of deviation of the growth index $\gamma$ from fiducial $\sim 0.55$ would indicate a
deviation from General Relativity. $\gamma$ was designated in Euclid red book as one of the parameters that could be well measured, alone or when mixed with other cosmological...

7. Inflation meets dark energy: $\alpha$-attractor quintessential inflation in the era of Euclid

Yashar Akrami (Lorentz Institute for Theoretical Physics, Leiden University)

TWG talk

Over the last few years, a large family of cosmological attractor models has been discovered, which can successfully match the latest inflation-related observational data. Many of these models can also describe a small cosmological constant $\Lambda$. In this talk, I will present a recently discovered class of $\alpha$-attractor models with dynamical dark energy, including the cosmological...

1. Measuring Dark Energy with Euclid

Dr Santiago Casas (ITP Heidelberg)

TWG talk

Determining the equation of state of Dark Energy using Galaxy Clustering and Weak Lensing.

9. Propagation of gravitational waves in doubly-coupled bigravity

M. Valeri Vardanyan (U Leiden)

TWG talk

I will discuss the implications of the recent detection of
gravitational waves emitted by a pair of merging neutron stars and their
electromagnetic counterpart, events GW170817 and GRB170817A,
on the viability of the doubly-coupled bimetric models of cosmic
evolution, where the two metrics couple directly to matter through a
composite, effective metric. I will show that the bounds
on the...

2. Weak gravitational lensing as a (3D) probe of gravity

Alessio Spurio Mancini (University of Heidelberg)

TWG talk

Cosmic shear, the weak gravitational lensing caused by the large-scale structure, is one of the primary probes to test gravity on cosmological scales with current and future surveys such as Euclid. In particular, cosmic shear is sensitive to both standard GR cosmological parameters and those that describe modified theories of gravity, such as those belonging to the Horndeski class. These...