23 citations · 100 across the 13 of their papers we have counts for
13 papers
Biased tracers, Hybrid Effective Field Theory and Modified Gravity
Guilherme Brando, Baojiu Li, Kazuya Koyama
The modelling of the power spectrum of biased tracers has become a central topic in the analysis of modern cosmological galaxy surveys. Perturbative templates formulated in both Eu…
The sound of dynamical dark energy and modified gravity
João Rebouças, Guilherme Brando, Felipe T. Falciano +1
Different candidate models are able to reproduce the dynamical dark energy signal preferred by combinations of recent distance measurements. These models may be distinguished by th…
Matter Power Spectra in Modified Gravity: A Comparative Study of Approximations and -Body Simulations
Benjamin Bose, Ashim Sen Gupta, Bartolomeo Fiorini +9
Testing gravity and the concordance model of cosmology, CDM, at large scales is a key goal of this decade's largest galaxy surveys. Here we present a comparative study of dark m…
Modeling nonlinear scales with COLA: preparing for LSST-Y1
Jonathan Gordon, Bernardo F. de Aguiar, João Rebouças +5
Year 1 results of the Legacy Survey of Space and Time (LSST) will provide tighter constraints on small-scale cosmology, beyond the validity of linear perturbation theory. This heig…
Revisiting Vainshtein Screening for fast N-body simulations
Guilherme Brando, Kazuya Koyama, Hans A. Winther
We revisit a method to incorporate the Vainshtein screening mechanism in N-body simulations proposed by R. Scoccimarro in~\cite{Scoccimarro:2009eu}. We further extend this method t…
Enabling matter power spectrum emulation in beyond-CDM cosmologies with COLA
Guilherme Brando, Bartolomeo Fiorini, Kazuya Koyama +1
We compare and validate COLA (COmoving Lagrangian Acceleration) simulations against existing emulators in the literature, namely Bacco and Euclid Emulator 2. Our analysis focuses o…
Fully relativistic predictions in Horndeski gravity from standard Newtonian N-body simulations
Guilherme Brando, Kazuya Koyama, David Wands +3
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 inv…
Relativistic Corrections to the Growth of Structure in Modified Gravity
Guilherme Brando, Kazuya Koyama, David Wands
We present a method to introduce relativistic corrections including linear dark energy perturbations in Horndeski theory into Newtonian simulations based on the N-body gauge approa…
Exploring Early and Late Cosmology with Next Generation Surveys
Guilherme Brando, Eric V. Linder
Perturbations from inflation evolve into large scale structure of the late universe, and encode abundant cosmic structure formation physics. We allow freedom in the primordial powe…
Modified Gravity Away from a CDM Background
Guilherme Brando, Felipe T. Falciano, Eric V. Linder +1
Within the effective field theory approach to cosmic acceleration, the background expansion can be specified separately from the gravitational modifications. We explore the impact…
A quasi-matter bounce equivalent to Starobinsky inflation
L. F. Guimarães, F. T. Falciano, G. Brando
In this paper we construct a bounce model that mimics the Starobinsky inflationary model. Our construction relies on Wands' duality, which shows that the Mukhanov-Sasaki equation h…
Stiff Matter Solution in Brans-Dicke Theory and The General Relativity Limit
G. Brando, J. C. Fabris, F. T. Falciano +1
Generally the Brans-Dicke theory reduces to General Relativity in the limit if the scalar field goes as . However, it is also known that there are…
Spacetime Singularities in Generalized Brans-Dicke Theories
G. Brando, F. T. Falciano, L. F. Guimaraes
We study the formation of classical singularities in Generalized Brans-Dicke theories that are natural extensions to Brans-Dicke where the kinetic term is modified by a new couplin…