44 citations · 235 across the 26 of their papers we have counts for
28 papers
Mercury (Hg): a relativistic -body simulation for Horndeski gravity
Ahmad Nouri-Zonoz, Farbod Hassani, Julian Adamek +2
We present Mercury, a relativistic -body code for cosmological simulations in the -basis formulation of Horndeski gravity. Mercury extends a particle-mesh scheme by incorpora…
Cosmological Signatures of Curvature-Coupled Dark Energy
Abdolali Banihashemi, Farbod Hassani, Alessandro Casalino +2
We study a curvature-coupled dark energy model that can modify cosmological evolution both before recombination and during the late-time accelerated era. The model belongs to the c…
Signatures of kinetic gravity braiding in cosmological probes of the gravitational field
Ahmad Nouri-Zonoz, Farbod Hassani, Julian Adamek +2
We study the observational signatures of kinetic gravity braiding (KGB) models in relativistic cosmological probes constructed along the past light cone. Using the relativistic …
KGB-evolution: a relativistic -body code for kinetic gravity braiding models
Ahmad Nouri-Zonoz, Farbod Hassani, Emilio Bellini +1
We present KGB-evolution, a relativistic -body simulation code that extends the -evolution code by incorporating an effective field theory parameterization of kinetic gravity…
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…
-elator: emulating clustering effects of the -essence dark energy
A. R. Nouri-Zonoz, F. Hassani, M. Kunz
We build an emulator based on the polynomial chaos expansion (PCE) technique to efficiently model the non-linear effects associated with the clustering of the -essence dark ener…
Environmental cosmic acceleration from a phase transition in the dark sector
Øyvind Christiansen, Farbod Hassani, David F. Mota
A new degravitation mechanism within the framework of scalar tensor gravity is postulated and included by prescription. The mechanism eliminates all constant contributions from the…
asimulation: Domain formation and impact on observables in resolved cosmological simulations of the (a)symmetron
Øyvind Christiansen, Farbod Hassani, David F. Mota
The symmetron is a dark energy and dark matter candidate that forms topological defects in the late-time universe and holds the promise of resolving some of the cosmological tensio…
Gravitational waves from dark domain walls
Øyvind Christiansen, Julian Adamek, Farbod Hassani +1
For most of cosmic history, the evolution of our Universe has been governed by the physics of a 'dark sector', consisting of dark matter and dark energy, whose properties are only…
Clustering of dark matter in the cosmic web as a probe of massive neutrinos
Mohadese Khoshtinat, Mohammad Ansarifard, Farbod Hassani +1
The large-scale structure of the Universe is distributed in a cosmic web. Studying the distribution and clustering of dark matter particles and halos may open up a new horizon for…
Clusternets: A deep learning approach to probe clustering dark energy
Amirmohammad Chegeni, Farbod Hassani, Alireza Vafaei Sadr +2
Machine Learning (ML) algorithms are becoming popular in cosmology for extracting valuable information from cosmological data. In this paper, we evaluate the performance of a Convo…
asevolution: a relativistic N-body implementation of the (a)symmetron
Øyvind Christiansen, Farbod Hassani, Mona Jalilvand +1
We present asevolution, a cosmological N-body code developed based on gevolution, which consistently solves for the (a)symmetron scalar field and metric potentials within the weak-…
Euclid: Modelling massive neutrinos in cosmology -- a code comparison
J. Adamek, R. E. Angulo, C. Arnold +133
The measurement of the absolute neutrino mass scale from cosmological large-scale clustering data is one of the key science goals of the Euclid mission. Such a measurement relies o…
Biased tracers as a probe of beyond-CDM cosmologies
Farbod Hassani, Julian Adamek, Ruth Durrer +1
Cosmological models beyond CDM, like those featuring massive neutrinos or modifications of gravity, often display a characteristic change (scale-dependent suppression or enhance…
Instabilities Appearing in Cosmological Effective Field theories: When and How?
Jean-Pierre Eckmann, Farbod Hassani, Hatem Zaag
Nonlinear partial differential equations appear in many domains of physics, and we study here a typical equation which one finds in effective field theories (EFT) originated from c…
A new instability in clustering dark energy?
Farbod Hassani, Julian Adamek, Martin Kunz +2
In this paper, we study the effective field theory (EFT) of dark energy for the -essence model beyond linear order. Using particle-mesh -body simulations that consistently so…
Cosmic velocity, density and halo mass function: Insights from deep learning
Saba Etezad-Razavi, Erfan Abbasgholinejad, Mohammad-Hadi Sotoudeh +3
We discuss an implementation of a deep learning framework to gain insight into dark matter (DM) structure formation. We investigate the contribution of velocity and density field i…
A new nonlinear instability for scalar fields
Farbod Hassani, Pan Shi, Julian Adamek +2
In this letter we introduce the non-linear partial differential equation (PDE) showing a new type of instability. Such equations appear in…
Structure of cosmic web in non-linear regime: the nearest neighbour and spherical contact distributions
Mohammad Ansari Fard, Zahra Baghkhani, Laya Ghodsi +3
In non-linear scales, the matter density distribution is not Gaussian. Consequently, the widely used two-point correlation function is not adequate anymore to capture the matter de…
Clustering dark energy imprints on cosmological observables of the gravitational field
Farbod Hassani, Julian Adamek, Martin Kunz
We study cosmological observables on the past light cone of a fixed observer in the context of clustering dark energy. We focus on observables that probe the gravitational field di…
-body simulations for parametrised modified gravity
Farbod Hassani, Lucas Lombriser
We present , an -body code simulating the cosmological structure formation for parametrised modifications of gravity. It is built from the combination of…
Parametrising non-linear dark energy perturbations
Farbod Hassani, Benjamin L'Huillier, Arman Shafieloo +2
In this paper, we quantify the non-linear effects from -essence dark energy through an effective parameter that encodes the additional contribution of a dark energy fluid or…
-evolution: a relativistic N-body code for clustering dark energy
Farbod Hassani, Julian Adamek, Martin Kunz +1
We introduce -evolution, a relativistic -body code based on , which includes clustering dark energy among its cosmological components. To describe dark e…
The detection of relativistic corrections in cosmological N-body simulations
Jean-Pierre Eckmann, Farbod Hassani
Cosmological N-body simulations are done on massively parallel computers. This necessitates the use of simple time integrators, and, additionally, of mesh-grid approximations of th…