17 papers · ranked by Valyu relevance
M. Kilbinger
Cosmic shear is the distortion of images of distant galaxies due to weak gravitational lensing by the large-scale structure in the Universe. Such images are coherently deformed by the tidal field of matter inhomogeneities along the line of sight. By measuring galaxy shape correlations, we can study the properties and…
Mustapha Ishak
We review recent developments and results in testing general relativity (GR) at cosmological scales. The subject has witnessed rapid growth during the last two decades with the aim of addressing the question of cosmic acceleration and the dark energy associated with it. However, with the advent of precision cosmology…
Luca Amendola, Stephen Appleby, Anastasios Avgoustidis, David Bacon + 67 more
Euclid is a European Space Agency medium-class mission selected for launch in 2020 within the cosmic vision 2015-2025 program. The main goal of Euclid is to understand the origin of the accelerated expansion of the universe. Euclid will explore the expansion history of the universe and the evolution of cosmic…
Simon Birrer, Alexandre Réfrégier, A. Amara
We explore a new technique to measure cosmic shear using Einstein rings. In Birrer et al. (2017), we showed that the detailed modelling of Einstein rings can be used to measure external shear to high precision. In this letter, we explore how a collection of Einstein rings can be used as a statistical probe of cosmic…
Pierre Fleury
> Cosmic shear is a key probe of modern cosmology. Amongst its challenges are shape noise and intrinsic alignments, both due to our ignorance of the unlensed shape of the source galaxies. I argue here that Einstein rings may be used as standard shapes to measure the external shear along their line of sight. In the…
Ruth Durrer
In this paper I investigate the possibility to test Einstein’s equations with observations of cosmological large scale structure. I first show that we have not tested the equations in observations concerning only the homogeneous and isotropic Universe. I then show with several examples how we can do better when…
Luigi Tedesco
In order to study if the anisotropy of the spacetime may induce differences in the cosmic shear or in deceleration parameter we investigate in Bianchi I Universe the most general expression for the cosmic shear and we study the connections between deceleration parameter and cosmic shear. We also consider a shear…
Noam I. Libeskind, Yehuda Hoffman, Matthias Steinmetz, Stefan Gottlöber + 2 more
'Stefan Gottlöber' 'Alexander Knebe' 'Steffen Heß'] In the standard model of cosmology, structure emerges out of non-rotational flow and the angular momentum of collapsing halos is induced by tidal torques. The growth of halo angular momentum in the linear and quasi-linear phases is associated with a shear, curl-free…
Nora Elisa Chisari
The alignments of galaxies across the large-scale structure of the Universe are known to be a source of contamination for gravitational lensing, but they can also probe cosmology and the physics of galaxy evolution in many ways. In this review, I cover developments in our understanding of intrinsic alignments over the…
Mark C. Neyrinck, Johan Hidding, Marina Konstantatou, Rien van de Weygaert
'Rien van de Weygaert'] For over 20 years, the term ‘cosmic web’ has guided our understanding of the large-scale arrangement of matter in the cosmos, accurately evoking the concept of a network of galaxies linked by filaments. But the physical correspondence between the cosmic web and structural engineering or textile…
D. M. Pomarede, Yehuda Hoffman, H. M. Courtois, R. Brent Tully
The network of filaments with embedded clusters surrounding voids seen in maps derived from redshift surveys and reproduced in simulations has been referred to as the cosmic web. A complementary description is provided by considering the shear in the velocity field of galaxies. The eigenvalues of the shear provide…
George Efstathiou
Observations of the cosmic microwave background (CMB) radiation are described with remarkable accuracy by the six-parameter $Λ$CDM cosmology. However, the key ingredients of this model, namely dark matter, dark energy and cosmic inflation are not understood at a fundamental level. It is, therefore, important to…
Yehuda Hoffman, D. M. Pomarede, R. Brent Tully, H. M. Courtois
In accordance with Nature publication policy, this version is the original one submitted to Nature Astronomy. The accepted version is accessible online at Nature Astronomy and differs from this one. Nature Astronomy 2017, Volume 1 , article 36. We will be allowed to post in 6 months the accepted version on arxiv.
Sawako Yamashiro, Misato Nomura, Nils Chapin, Sreeja Sasidharan + 5 more
Cells sense and respond to fluid shear stress. Cell surfaces are exposed to flow, yet the influence of shear stress on the behavior of plasma membrane proteins remains unclear. Here we show that extracellular flow induces the gradient distribution of cell membrane proteins with increasing concentration toward the…
Shubhadeep Sadhukhan, Samo Penič, Aleš Iglič, Nir Gov
Cell spreading and motility on an adhesive substrate are driven by the active physical forces generated by the actin cytoskeleton. We have recently shown that coupling curved membrane complexes to protrusive forces, exerted by the actin polymerization that they recruit, provides a mechanism that can give rise to…
Matthew C. Watson, Erica C. Kemmerling, Lauren D Black
Fluid shear stress is a critical regulator of endothelial cell function and cardiovascular development, yet in vitro platforms often lack the ability to reproduce physiologically relevant, time-dependent flow environments with quantitative precision. Here, we present the design and validation of a macro-scale…
Justin Kwok, Giridar Vishwanathan, Kyung Sun Park, Bijal Patel + 3 more
Fluid flow is an inherent aspect of solution processing of conjugated polymers. Much of the existing work investigating the effect of flow has been phenomenological, lacking a direct and quantitative connection between the flow gradients and measurable quantities of the conformation or alignment of the conjugated…