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Št. zadetkov: 6
Maximal freedom at minimum cost
Emilio Bellini, Ignacy Sawicki
Izvirni znanstveni članek
Oznake: modified gravity;cosmological parameters from LSS;cosmological perturbation theory;dark energy theory;gravitation;effective field theory;
We present a turnkey solution, ready for implementation in numerical codes, for the study of linear structure formation in general scalar-tensor models involving a single universally coupled scalar field. We show that the totality of cosmological information on the gravitational sector can be compre ...
Leto: 2014 Vir: Repozitorij Univerze v Novi Gorici (RUNG)
Limits of quasistatic approximation in modified-gravity cosmologies
Ignacy Sawicki, Emilio Bellini
Izvirni znanstveni članek
Oznake: modified gravity;dark energy;cosmology;
We investigate the limits of applicability of the quasistatic approximation in cosmologies featuring general models of dark energy or modified gravity. We show that, at best, the quasistatic approximation breaks down outside of the sound horizon of the dark-energy, rather than the cosmological hor ...
Leto: 2015 Vir: Repozitorij Univerze v Novi Gorici (RUNG)
hi class background evolution, initial conditions and approximation schemes
Emilio Bellini, Ignacy Sawicki, Miguel Zumalacarregui
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)
hi class
Miguel Zumalacarregui, Emilio Bellini, Ignacy Sawicki, Julien Lesgourgues, Pedro G. Ferreira
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)
Strong constraints on cosmological gravity from GW170817 and GRB 170817A
Tessa Baker, Emilio Bellini, Pedro G. Ferreira, M. Lagos, J. Noller, Ignacy Sawicki
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)
Fully relativistic predictions in Horndeski gravity from standard Newtonian N-body simulations
Guilherme Brando, Kazuya Koyama, David Wands, Miguel Zumalacarregui, Ignacy Sawicki, Emilio Bellini
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)
Št. zadetkov: 6
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