Št. zadetkov: 9
Izvirni znanstveni članek
Oznake:
modified gravity;dark energy;cosmology;power spectrum;
The scale of baryon acoustic oscillations (BAO) imprinted in the matter power spectrum provides an almost-perfect standard ruler: it only suffers subpercent deviations from fixed comoving length due to nonlinear effects. We study the BAO shift in the large Horndeski class of gravitational theories a ...
Leto:
2015
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
modified gravity;dark energy;cosmology;cosmological constraints;CMB, large-scale structure;power spectrum;perturbation theory;
Cosmological datasets have great potential to elucidate the nature of dark energy and test gravity on the largest scales available to observation. Theoretical predictions can be computed with hi_class (www.hiclass-code.net), an accurate, fast and flexible code for linear cosmology, incorporating a w ...
Leto:
2020
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;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:
alternative gravity theories;cosmology;dark energy;evolution of the universe;large scale structure of the universe;
In light of the evidence for dynamical dark energy (DE) found from the most recent Dark Energy Spectroscopic Instrument (DESI) baryon acoustic oscillation (BAO) measurements, we perform a nonparametric, model-independent reconstruction of the DE density evolution. To do so, we develop and validate a ...
Leto:
2025
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)
Izvirni znanstveni članek
Oznake:
modified gravity;dark energy;cosmology;cosmological constraints;neutrinos;CMB;large-scale structure;power spectrum;bispectrum;perturbation theory;galaxy surveys;N-body simulations;
The N-body gauge allows the introduction of relativistic effects in Newtonian cosmological simulations. Here we extend this framework to general Horndeski gravity theories, and investigate the relativistic effects that the scalar field introduces in the matter power spectrum at intermediate and larg ...
Leto:
2021
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:
modified gravity;dark energy;cosmology;cosmological constraints;neutrinos;CMB;large-scale structure;power spectrum;perturbation theory;
Leto:
2018
Vir:
Repozitorij Univerze v Novi Gorici (RUNG)