31 research outputs found
Euclid: Modelling massive neutrinos in cosmology -- a code comparison
The measurement of the absolute neutrino mass scale from cosmological
large-scale clustering data is one of the key science goals of the Euclid
mission. Such a measurement relies on precise modelling of the impact of
neutrinos on structure formation, which can be studied with -body
simulations. Here we present the results from a major code comparison effort to
establish the maturity and reliability of numerical methods for treating
massive neutrinos. The comparison includes eleven full -body implementations
(not all of them independent), two -body schemes with approximate time
integration, and four additional codes that directly predict or emulate the
matter power spectrum. Using a common set of initial data we quantify the
relative agreement on the nonlinear power spectrum of cold dark matter and
baryons and, for the -body codes, also the relative agreement on the
bispectrum, halo mass function, and halo bias. We find that the different
numerical implementations produce fully consistent results. We can therefore be
confident that we can model the impact of massive neutrinos at the sub-percent
level in the most common summary statistics. We also provide a code validation
pipeline for future reference.Comment: 43 pages, 17 figures, 2 tables; published on behalf of the Euclid
Consortium; data available at https://doi.org/10.5281/zenodo.729797
Glucocorticoid mediated regulation of inflammation in human monocytes is associated with depressive mood and obesity
Epigenetics and lifestyle: the impact of stress, diet and social habits on tissue homeostasis
CapĂtulo 19.The way that we live influences our health, and during our lifespan we are exposed to a great diversity of compounds and stresses. There is growing evidence of epigenetic alterations that appear associated with external cues, however, the functional role that epigenetic mechanisms play in the response to environmental stimuli remains to be clarified. In this chapter, we will discuss how our lifestyle influences the epigenome, paying special attention to our diet, bad habits, and the stress that we are subject to on a daily basis. These epigenetic changes can affect the homeostasis of our cells and tissues, possibly playing a role in the development of disease.Peer reviewe
Euclid: Constraining linearly scale-independent modifications of gravity with the spectroscopic and photometric primary probes
International audienceThe future Euclid space satellite mission will offer an invaluable opportunity to constrain modifications to general relativity at cosmic scales. We focus on modified gravity models characterised, at linear scales, by a scale-independent growth of perturbations while featuring different testable types of derivative screening mechanisms at smaller nonlinear scales. We consider 3 specific models, namely Jordan-Brans-Dicke (JBD), the normal branch of Dvali-Gabadadze-Porrati (nDGP) gravity and -mouflage (KM) gravity. We provide forecasts from spectroscopic and photometric primary probes by Euclid on the cosmological parameters and the extra parameters of the models, respectively, , and , which quantify the deviations from general relativity. This analysis will improve our knowledge of the cosmology of these modified gravity models. The forecasts analysis employs the Fisher matrix method applied to weak lensing (WL); photometric galaxy clustering (GC); spectroscopic galaxy clustering (GC) and the cross-correlation (XC) between GC and WL. For the Euclid survey specifications we define three scenarios, characterised by different cuts in and , to assess the constraining power of nonlinear scales. For each model we consider two fiducial values for the corresponding model parameter. In an optimistic setting at 68.3% confidence interval, with Euclid alone we find the following percentage relative errors: for , with a fiducial value of , 35% using GC alone, 3.6% using GC+WL+XC and 3.3% using GC+WL+XC+GC; for , with a fiducial value of , we find respectively 90%, 20% and 17%; finally, for respectively 5%, 0.15% and 0.14%. (abridged
Euclid: Constraining linearly scale-independent modifications of gravity with the spectroscopic and photometric primary probes
International audienceThe future Euclid space satellite mission will offer an invaluable opportunity to constrain modifications to general relativity at cosmic scales. We focus on modified gravity models characterised, at linear scales, by a scale-independent growth of perturbations while featuring different testable types of derivative screening mechanisms at smaller nonlinear scales. We consider 3 specific models, namely Jordan-Brans-Dicke (JBD), the normal branch of Dvali-Gabadadze-Porrati (nDGP) gravity and -mouflage (KM) gravity. We provide forecasts from spectroscopic and photometric primary probes by Euclid on the cosmological parameters and the extra parameters of the models, respectively, , and , which quantify the deviations from general relativity. This analysis will improve our knowledge of the cosmology of these modified gravity models. The forecasts analysis employs the Fisher matrix method applied to weak lensing (WL); photometric galaxy clustering (GC); spectroscopic galaxy clustering (GC) and the cross-correlation (XC) between GC and WL. For the Euclid survey specifications we define three scenarios, characterised by different cuts in and , to assess the constraining power of nonlinear scales. For each model we consider two fiducial values for the corresponding model parameter. In an optimistic setting at 68.3% confidence interval, with Euclid alone we find the following percentage relative errors: for , with a fiducial value of , 35% using GC alone, 3.6% using GC+WL+XC and 3.3% using GC+WL+XC+GC; for , with a fiducial value of , we find respectively 90%, 20% and 17%; finally, for respectively 5%, 0.15% and 0.14%. (abridged
Euclid: Constraining linearly scale-independent modifications of gravity with the spectroscopic and photometric primary probes
International audienceThe future Euclid space satellite mission will offer an invaluable opportunity to constrain modifications to general relativity at cosmic scales. We focus on modified gravity models characterised, at linear scales, by a scale-independent growth of perturbations while featuring different testable types of derivative screening mechanisms at smaller nonlinear scales. We consider 3 specific models, namely Jordan-Brans-Dicke (JBD), the normal branch of Dvali-Gabadadze-Porrati (nDGP) gravity and -mouflage (KM) gravity. We provide forecasts from spectroscopic and photometric primary probes by Euclid on the cosmological parameters and the extra parameters of the models, respectively, , and , which quantify the deviations from general relativity. This analysis will improve our knowledge of the cosmology of these modified gravity models. The forecasts analysis employs the Fisher matrix method applied to weak lensing (WL); photometric galaxy clustering (GC); spectroscopic galaxy clustering (GC) and the cross-correlation (XC) between GC and WL. For the Euclid survey specifications we define three scenarios, characterised by different cuts in and , to assess the constraining power of nonlinear scales. For each model we consider two fiducial values for the corresponding model parameter. In an optimistic setting at 68.3% confidence interval, with Euclid alone we find the following percentage relative errors: for , with a fiducial value of , 35% using GC alone, 3.6% using GC+WL+XC and 3.3% using GC+WL+XC+GC; for , with a fiducial value of , we find respectively 90%, 20% and 17%; finally, for respectively 5%, 0.15% and 0.14%. (abridged
Euclid: Constraining linearly scale-independent modifications of gravity with the spectroscopic and photometric primary probes
International audienceThe future Euclid space satellite mission will offer an invaluable opportunity to constrain modifications to general relativity at cosmic scales. We focus on modified gravity models characterised, at linear scales, by a scale-independent growth of perturbations while featuring different testable types of derivative screening mechanisms at smaller nonlinear scales. We consider 3 specific models, namely Jordan-Brans-Dicke (JBD), the normal branch of Dvali-Gabadadze-Porrati (nDGP) gravity and -mouflage (KM) gravity. We provide forecasts from spectroscopic and photometric primary probes by Euclid on the cosmological parameters and the extra parameters of the models, respectively, , and , which quantify the deviations from general relativity. This analysis will improve our knowledge of the cosmology of these modified gravity models. The forecasts analysis employs the Fisher matrix method applied to weak lensing (WL); photometric galaxy clustering (GC); spectroscopic galaxy clustering (GC) and the cross-correlation (XC) between GC and WL. For the Euclid survey specifications we define three scenarios, characterised by different cuts in and , to assess the constraining power of nonlinear scales. For each model we consider two fiducial values for the corresponding model parameter. In an optimistic setting at 68.3% confidence interval, with Euclid alone we find the following percentage relative errors: for , with a fiducial value of , 35% using GC alone, 3.6% using GC+WL+XC and 3.3% using GC+WL+XC+GC; for , with a fiducial value of , we find respectively 90%, 20% and 17%; finally, for respectively 5%, 0.15% and 0.14%. (abridged