26 papers · ranked by Valyu relevance
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…
T. R. Mongan
This analysis considers our universe as a closed Friedmann universe, dominated by vacuum energy in the form of a cosmological constant, with cosmological parameters obtained from full mission Planck satellite observations. A few simple assumptions lead to straightforward calculation of general features of large scale…
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…
Changbom Park, Yun‐Young Choi, Juhan Kim, J. Richard Gott + 2 more
'Sungsoo S. Kim' 'Kap‒Sung Kim'] Large galaxy redshift surveys have long been used to constrain cosmological models and structure formation scenarios. In particular, the largest structures discovered observationally are thought to carry critical information on the amplitude of large-scale density fluctuations or…
I. D. Karachentsev
Six challenges for the standard cosmological model $Λ$CDM are listed, which arise when comparing theoretical predictions with observational data on scales of ~1 Mpc. Different parameters of luminous and dwarf galaxies in the local sphere with a radius of 12 Mpc are presented. The average densities of stellar matter and…
Till Sawala, Meri Teeriaho, Carlos S. Frenk, John Helly + 4 more
universe Authors: ['Till Sawala' 'Meri Teeriaho' 'Carlos S. Frenk' 'John Helly' 'Adrian Jenkins' 'Gábor Rácz' 'Matthieu Schaller' 'Joop Schaye'] Recent discoveries of apparent large-scale features in the structure of the universe extending over many hundreds of megaparsecs, have been claimed to contradict the…
Wiesław M. Macek, Dariusz Wójcik
We have recently argued that the expansion of the Universe is compatible not only with standard homogeneity, but also with fractal homogeneity in a hierarchical fractal cosmology. In this work we further test this paradigm using the galactic distances obtained from the Updated CfA Redshift Catalogs. We confirm that the…
Authors not listed
Hyperstructures and their hierarchical extensions—SuperHyperStructures—provide a versatile algebraic language for modeling multi-level and interdependent systems [1,2]. In materials and chemical sciences, structural descriptions naturally span a broad spectrum of characteristic length scales, commonly organized as…
Siamak Dehghan, M. Johnston‐Hollitt
We present a comprehensive structure detection analysis of the 0.3 square degree area of the MUSYC-ACES field which covers the Chandra Deep Field-South (CDFS). Using a density-based clustering algorithm on the MUSYC and ACES photometric and spectroscopic catalogues we find 62 over-dense regions up to redshifts of 1…
Authors not listed
Machine Learning Interatomic Potentials (MLIPs), trained with Quantum Mechanics data, can model potential energy surfaces for molecular systems with very high accuracy and extreme speedups compared to reference quantum calculations, offering a powerful tool for studying complex chemical and biological systems. This…
David H. Weinberg
The Center is Everywhere is a sculpture by Josiah McElheny, currently (through October 14, 2012) on exhibit at the Institute of Contemporary Art, Boston. The sculpture is based on data from the Sloan Digital Sky Survey (SDSS), using hundreds of glass crystals and lamps suspended from brass rods to represent the…
Zhijie Xu
Smalls scale challenges suggest some missing pieces in our current understanding of dark matter. A cascade theory for dark matter is proposed to provide extra insights, similar to the cascade phenomenon in hydrodynamic turbulence. The kinetic energy is cascaded in dark matter from small to large scales involves a…
Enrique R. Sebastian, Julio Esparza, Liset M de la Prida
Identifying the structured distribution (or lack thereof) of a given feature over a point cloud is a general research question. In the neuroscience field, this problem arises while investigating representations over neural manifolds (e.g., spatial coding), in the analysis of neurophysiological signals (e.g., auditory…
Zhijie (Jay) Xu
Halo abundance and structure play a central role for modeling structure formation and evolution. Without relying on a spherical or ellipsoidal collapse model, we analytically derive the halo mass function and cuspy halo density (inner slope of −4/3) based on the mass and energy cascade theory in dark matter flow. The…
Piero Gasparotto, Luis Barba, Hans-Christian Stadler, Greta Assmann + 5 more
Serial Crystallography (SX) involves the processing of thousands of diffraction patterns coming from crystals in random orientations. To compile a complete dataset, these patterns must be indexed (i.e., determine orientation), integrated, and merged. We introduce the TORO (TOrch-powered Robust Optimization) Indexer, a…
Hirokazu Yagi, You-Rong Lin, Yuki Kanaoka, Fumiko Umezawa + 10 more
Glycosyltransferases often contain multiple structural modules that contribute to substrate recognition, catalytic coordination, and higher-order molecular organization. However, how multidomain glycosyltransferases dynamically organize their catalytic domains in solution remains poorly understood. Here, we…
Patrick Peebles
Our universe has ample room for a great number things, some of which are observationally accessible, and a fraction of which might teach us something new and interesting about the large-scale nature of the universe. I present a list of examples along this line in the next section. But evaluation of ideas about…
Steve P. Meisburger, David A. Case, Nozomi Ando
Protein dynamics are integral to biological function, yet few techniques are sensitive to collective atomic motions. A long-standing goal of X-ray crystallography has been to combine structural information from Bragg diffraction with dynamic information contained in the diffuse scattering background. However, the…
Simen Hagen, Yuanfang Zhao, Hans Op de Beeck, Marius V. Peelen
Object representations in the human ventral occipitotemporal cortex (VOTC) are organized along multiple dimensions, including shape (rectilinear vs. curvilinear), real-world size (large vs. small), and mobility (stationary vs. mobile). However, these dimensions are strongly correlated in naturalistic vision, making…
Steve P. Meisburger, David A. Case, Nozomi Ando
The breathing motions of proteins are thought to play a critical role in function. However, current techniques to study subtle collective motions are limited to spectroscopy and computation. We present a high-resolution experimental approach based on the total scattering from protein crystals at room temperature…
Steve P. Meisburgera, Nozomi Andob
Diffuse scattering is a promising method to gain additional insight into protein dynamics from macro-molecular crystallography (MX) experiments. Bragg intensities yield the average electron density, while the diffuse scattering can be processed to obtain a three-dimensional reciprocal space map, that is further…
Wayan Gauthey, Albert Lin, Osama M. Ahmed, Andrew M. Leifer + 2 more
Recent advances in brain-wide recordings of small animals such as worms, fish, and flies have revealed complex activity involving large populations of neurons. In the Drosophila brain, with about 140,000 neurons, brain-wide recordings have been critical to uncovering widespread sensory and motor activity. However…
Sukriti Manna, Alberto Hernandez, Yunzhe Wang, Peter Lile + 2 more
The chemical and structural properties of atomically precise nanoclusters are of great interest in numerous applications, but the structures of the clusters can be computationally expensive to predict. In this work, we present the largest database of cluster structures and properties determined using ab-initio methods…
Stephanos Karafiludis, Ernesto Scoppola, Stephan E. Wolf, Zdravko Kochovski + 5 more
The precipitation of struvite, a magnesium ammonium phosphate hexahydrate (MgNH4PO4⋅6H2O) mineral, from wastewater is a promising method for recovering phosphorous. While this process is commonly used in engineered environments, our understanding of the underlying mechanisms responsible for the formation of struvite…
Neal Jackson
I review the current state of determinations of the Hubble constant, which gives the length scale of the Universe by relating the expansion velocity of objects to their distance. There are two broad categories of measurements. The first uses individual astrophysical objects which have some property that allows their…
Mélanie Chevance, J. M. Diederik Kruijssen, Enrique Vazquez-Semadeni, Fumitaka Nakamura + 5 more
'Fumitaka Nakamura' 'Ralf Klessen' 'Javier Ballesteros-Paredes' 'Shu-ichiro Inutsuka' 'Angela Adamo' 'Patrick Hennebelle'] Giant molecular clouds (GMCs) and their stellar offspring are the building blocks of galaxies. The physical characteristics of GMCs and their evolution are tightly connected to galaxy evolution.…