Št. zadetkov: 173
Izvirni znanstveni članek
Oznake:
modified gravity;cosmological perturbations;
We study the phenomenology of the beyond Horndeski class of scalar-tensor theories of gravity, which on cosmological scales can be characterised in terms of one extra function of time, βH, as well as the usual four Horndeski set of free functions. We show that βH can be directly related to the dampi ...
Leto:
2019
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
modified gravity;dark energy;cosmology;cosmological constraints;CMB;large-scale structure;
The next generation of surveys will greatly improve our knowledge of cosmological gravity. In this
paper we focus on how Stage IV photometric redshift surveys, including weak lensing and multiple
tracers of the matter distribution and radio experiments combined with measurements of the cosmic
mic ...
Leto:
2017
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
modified gravity;cosmological perturbations;Boltzmann codes;
We analyse cosmological perturbations around a homogeneous and isotropic background for scalar-tensor, vector-tensor and bimetric theories of gravity. Building on previous results, we propose a unified view of the effective parameters of all these theories. Based on this structure, we explore the vi ...
Leto:
2018
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
modified gravity;dark energy theory;cosmological parameters from CMBR;cosmological parameters from LSS;
We present the public version of hi_class (www.hiclass-code.net), an extension of the Boltzmann code CLASS to a broad ensemble of modifications to general relativity. In particular, hi_class can calculate predictions for models based on Horndeski's theory, which is the most general scalar-tensor the ...
Leto:
2017
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
modified gravity;dark energy;cosmology;cosmological constraints;CMB;large-scale structure;gravitational waves;
The detection of an electromagnetic counterpart (GRB 170817A) to the gravitational-wave signal (GW170817) from the merger of two neutron stars opens a completely new arena for testing theories of gravity. We show that this measurement allows us to place stringent constraints on general scalar-tensor ...
Leto:
2017
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
cosmology;gravitational waves;galaxy surveys;cosmological constraints;
Using an optimal quadratic estimator, we measure the large-scale cross-correlation between maps of the stochastic gravitational-wave intensity, constructed from the first three LIGO-Virgo observing runs, and a suite of tomographic samples of galaxies covering the redshift range
Leto:
2024
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
modified gravity;dark energy;cosmology;cosmological constraints;CMB;large-scale structure;
The late time acceleration of the Universe can be characterized in terms of an extra, time-dependent, component of the Universe—dark energy. The simplest proposal for dark energy is a scalar-tensor theory—quintessence—which consists of a scalar field, �, whose dynamics is solely dictated by its pote ...
Leto:
2020
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
modified gravity;dark energy;cosmology;cosmological constraints;neutrinos;CMB;
Attempts at constraining theories of late time accelerated expansion often assume broad priors for the parameters in their phenomenological description. Focusing on shift-symmetric scalar-tensor theories with standard gravitational wave speed, we show how a more careful analysis of their dynamical e ...
Leto:
2021
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
cosmology;cosmological constraints;large-scale structure;
In order to investigate the origin of the ongoing tension between the amplitude of matter fluctuations measured by weak lensing experiments at low redshifts and the value inferred from the cosmic microwave background anisotropies, we reconstruct the evolution of this amplitude from z ∼ 2 using exist ...
Leto:
2021
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
organizacija;informacijska tehnologija;digitalna transformacija;organization;information technology;
Digital technology has produced deep changes in the business world. However, companies have a hard time understanding consumers' changing needs and new consumption patterns, especially small and medium-sized enterprises that currently face growing challenges in an era characterized by a lack of time ...
Leto:
2024
Vir:
Ekonomska fakulteta (UL EF)