Publications (205)
gevolution: a cosmological N-body code based on General Relativity
Julian Adamek, David Daverio, Ruth Durrer +1
We present a new N-body code, gevolution, for the evolution of large scale structure in the Universe. Our code is based on a weak field expansion of General Relativity and calculat…
General relativity and cosmic structure formation
Julian Adamek, David Daverio, Ruth Durrer +1
Numerical simulations are a versatile tool providing insight into the complicated process of structure formation in cosmology. This process is mainly governed by gravity, which is…
The Hawking Energy in a Perturbed Friedmann-Lemaître Universe
Dennis Stock, Enea Di Dio, Ruth Durrer
Hawking's quasi-local energy definition quantifies the energy enclosed by a spacelike 2-sphere in terms of the amount of lightbending on the sphere caused by the energy distributio…
Capture of dark matter particles by a galaxy in the case of a bimodal distribution of their velocities
Ruth Durrer, Serge Parnovsky, Aleksei Parnowski
We have analyzed the rate of capture of dark matter (DM) particles by the galaxy in the case of the existence of two different types of DM or a bimodal velocity distribution functi…
Cosmological Number Counts in Einstein and Jordan frames
Jérémie Francfort, Basundhara Ghosh, Ruth Durrer
Even though we know that physical observations are frame independent, the frame dependence of cosmological perturbations is relatively subtle and has led to confusion in the past.…
Cosmological Information Contents on the Light-Cone
Jaiyul Yoo, Ermis Mitsou, Nastassia Grimm +2
We develop a theoretical framework to describe the cosmological observables on the past light cone such as the luminosity distance, weak lensing, galaxy clustering, and the cosmic…
Signatures of Topological Defects in the Microwave Sky: An Introduction
Ruth Durrer
An introduction to topological defects in cosmology is given. We discuss their possible relevance for structure formation. Especial emphasis is given on the signature of topologica…
Cosmology with the Laser Interferometer Space Antenna
Pierre Auclair, David Bacon, Tessa Baker +177
The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravita…
Redshift-space distortions from vector perturbations
Camille Bonvin, Ruth Durrer, Nima Khosravi +2
We compute a general expression for the contribution of vector perturbations to the redshift-space distortion of galaxy surveys. We show that they contribute to the same multipoles…
A new method for the Alcock-Paczynski test
Francesco Montanari, Ruth Durrer
We argue that from observations alone, only the transverse power spectrum and the corresponding correlation function can be measured and that the…
CMB anisotropies caused by gravitational waves: A parameter study
Ruth Durrer, Tina Kahniashvili
Anisotropies in the cosmic microwave background radiation due to gravity waves are investigated. An initial spectrum of gravity waves may have been induced during an epoch of infla…
: A New Cosmological Parameter?
Jaiyul Yoo, Ermis Mitsou, Yves Dirian +1
The background photon temperature is one of the fundamental cosmological parameters. Despite its significance, has never been allowed to vary in the data analysis…
Mode Spectrum of the Electromagnetic Field in Open Universe Models
Julian Adamek, Claudia de Rham, Ruth Durrer
We examine the mode functions of the electromagnetic field on spherically symmetric backgrounds with special attention to the subclass which allows for the foliation as open Friedm…
CMB Signatures of a Primordial Magnetic Field
Tina Kahniashvili, Arthur Kosowsky, Andrew Mack +1
A primordial stochastic magnetic field will induce temperature and polarization fluctuations in the cosmic microwave background. We outline a calculation of the resulting fluctuati…
Clarifying perturbations in the ekpyrotic universe
Ruth Durrer
In this note I try to clarify the problem of perturbations in the ekpyrotic universe. I write down the most general matching conditions and specify the choices taken by the two deb…
Gauge-Transformation Properties of Cosmological Observables and its Application to the Light-Cone Average
Jaiyul Yoo, Ruth Durrer
Theoretical descriptions of observable quantities in cosmological perturbation theory should be independent of coordinate systems. This statement is often referred to as gauge-inva…
Measuring the lensing potential with tomographic galaxy number counts
Francesco Montanari, Ruth Durrer
We investigate how the lensing potential can be measured tomographically with future galaxy surveys using their number counts. Such a measurement is an independent test of the stan…
Anisotropic 'hairs' in string cosmology
Kerstin E. Kunze, Ruth Durrer
In this letter we investigate whether the isotropy problem is naturally solved in inflationary cosmologies inspired by string theory, so called pre-big-bang cosmologies. We find th…
Dynamical Casimir effect for gravitons in bouncing braneworlds
Marcus Ruser, Ruth Durrer
We consider a two-brane system in a five-dimensional anti-de Sitter spacetime. We study particle creation due to the motion of the physical brane which first approaches the second…
A Fractal Galaxy Distribution in a Homogeneous Universe?
Ruth Durrer, Francesco Sylos Labini
In this letter we present an idea which reconciles a homogeneous and isotropic Friedmann universe with a fractal distribution of galaxies. We use two observational facts: The flat…
A longitudinal gauge degree of freedom and the Pais Uhlenbeck field
Jose Beltrán Jiménez, Enea Di Dio, Ruth Durrer
We show that a longitudinal gauge degree of freedom for a vector field is equivalent to a Pais-Uhlenbeck scalar field. With the help of this equivalence, we can determine natural i…
Gravitational waves in bigravity cosmology
Giulia Cusin, Ruth Durrer, Pietro Guarato +1
In this paper we study gravitational wave perturbations in a cosmological setting of bigravity which can reproduce the ÎCDM background and large scale structure. We show that in g…
Model-independent cosmological constraints from the CMB
Marc Vonlanthen, Syksy Rasanen, Ruth Durrer
We analyse CMB data in a manner which is as model-independent as possible. We encode the effects of late-time cosmology into a single parameter which determines the distance to the…
Graviton production in non-inflationary cosmology
Ruth Durrer, Massimiliano Rinaldi
We discuss the creation of massless particles in a Universe, which transits from a radiation-dominated era to any other expansion law. We calculate in detail the generation of grav…
The CMB bispectrum from bouncing cosmologies
Paola C. M. Delgado, Ruth Durrer, Nelson Pinto-Neto
In this paper we compute the CMB bispectrum for bouncing models motivated by Loop Quantum Cosmology. Despite the fact that the primordial bispectrum of these models is decaying exp…
Detection of gravitational waves from the QCD phase transition with pulsar timing arrays
Chiara Caprini, Ruth Durrer, Xavier Siemens
If the cosmological QCD phase transition is strongly first order and lasts sufficiently long, it generates a background of gravitational waves which may be detected via pulsar timi…
Generation of helical magnetic fields from inflation
Rajeev Kumar Jain, Ruth Durrer, Lukas Hollenstein
The generation of helical magnetic fields during single field inflation due to an axial coupling of the electromagnetic field to the inflaton is discussed. We find that such a coup…
Perturbations for massive gravity theories
Pietro Guarato, Ruth Durrer
A theory of massive gravity depends on a non-dynamical 'reference metric' f_{μν} which is often taken to be the flat Minkowski metric. In this paper we examine the theory of pert…
Comment on "Origin of cosmic magnetic fields"
Ruth Durrer, Giovanni Marozzi, Massimiliano Rinaldi
We argue that the result presented in "Origin of cosmic magnetic fields" by L. Campanelli [arXiv:1304.6534] is unphysical.
Does small scale structure significantly affect cosmological dynamics?
Julian Adamek, Chris Clarkson, Ruth Durrer +1
The large-scale homogeneity and isotropy of the universe is generally thought to imply a well defined background cosmological model. It may not. Smoothing over structure adds in an…
Cosmic Microwave Background Anisotropies from Global Texture
Ruth Durrer, Martin Kunz, Alessandro Melchiorri
We investigate the global texture model of structure formation in cosmogonies with non-zero cosmological constant for different values of the Hubble parameter. We find that the abs…
Interactions of cosmological gravitational waves and magnetic fields
Elisa Fenu, Ruth Durrer
The energy momentum tensor of a magnetic field always contains a spin-2 component in its anisotropic stress and therefore generates gravitational waves. It has been argued in the l…
Cosmological perturbation theory
Ruth Durrer
This is a review on cosmological perturbation theory. After an introduction, it presents the problem of gauge transformation. Gauge invariant variables are introduced and the Einst…
Effects of biasing on the galaxy power spectrum at large scales
Jose Beltrán Jiménez, Ruth Durrer
n this paper we study the effect of biasing on the power spectrum at large scales. We show that even though non-linear biasing does introduce a white noise contribution on large sc…
Skewness as a probe of non-Gaussian initial conditions
Ruth Durrer, Roman Juszkiewicz, Martin Kunz +1
We compute the skewness of the matter distribution arising from non-linear evolution and from non-Gaussian initial perturbations. We apply our result to a very generic class of mod…
Structure Formation in the Universe from Texture Induced Fluctuation
Ruth Durrer, Zhi-hong Zhou
The topic of this letter is structure formation with topological defects. We first present a partially new, fully local and gauge invariant system of perturbation equations to trea…
Relativistic N-body simulations with massive neutrinos
Julian Adamek, Ruth Durrer, Martin Kunz
Some of the dark matter in the Universe is made up of massive neutrinos. Their impact on the formation of large scale structure can be used to determine their absolute mass scale f…
Magnetic fields from inflation: the transition to the radiation era
Camille Bonvin, Chiara Caprini, Ruth Durrer
We compute the contribution to the scalar metric perturbations from large-scale magnetic fields which are generated during inflation. We show that apart from the usual passive and…
Fluctuations of the luminosity distance
Camille Bonvin, Ruth Durrer, M. Alice Gasparini
We derive an expression for the luminosity distance in a perturbed Friedmann universe. We define the correlation function and the power spectrum of the luminosity distance fluctuat…
Braneworlds, graviton production, dynamical Casimir effect
Ruth Durrer, Marcus Ruser, Marc Vonlanthen +1
If our Universe is a 3+1 brane in a warped 4+1 dimensional bulk so that its expansion can be understood as the motion of the brane in the bulk, the time dependence of the boundary…
Lensing signals from Spin-2 perturbations
Julian Adamek, Ruth Durrer, Vittorio Tansella
We compute the angular power spectra of the E-type and B-type lensing potentials for gravitational waves from inflation and for tensor perturbations induced by scalar perturbations…
Can slow roll inflation induce relevant helical magnetic fields?
Ruth Durrer, Lukas Hollenstein, Rajeev Kumar Jain
We study the generation of helical magnetic fields during single field inflation induced by an axial coupling of the electromagnetic field to the inflaton. During slow roll inflati…
An analytic approach to baryon acoustic oscillations
Francesco Montanari, Ruth Durrer
The fitting formula for the location of the first acoustic peak in the matter power spectrum is revised. We discuss the physics that leads to baryon acoustic oscillations: the reco…
The Kolmogorov-Smirnov test for the CMB
Mona Frommert, Ruth Durrer, Jérôme Michaud
We investigate the statistics of the cosmic microwave background using the Kolmogorov-Smirnov test. We show that, when we correctly de-correlate the data, the partition function of…
The Flat Sky Approximation to Galaxy Number Counts
William L. Matthewson, Ruth Durrer
We derive and test an approximation for the angular power spectrum of galaxy number counts in the flat sky limit. The standard density and redshift space distortion (RSD) terms in…
The Cosmic Microwave Background and Helical Magnetic Fields: the tensor mode
Chiara Caprini, Ruth Durrer, Tina Kahniashvili
We study the effect of a possible helicity component of a primordial magnetic field on the tensor part of the cosmic microwave background temperature anisotropies and polarization.…
Statistical Properties of Scale-Invariant Helical Magnetic Fields and Applications to Cosmology
Axel Brandenburg, Ruth Durrer, Tina Kahniashvili +2
We investigate the statistical properties of isotropic, stochastic, Gaussian distributed, helical magnetic fields characterized by different shapes of the energy spectra at large l…
Cosmic Microwave Background Anisotropies from Scaling Seeds: Global Defect Models
Ruth Durrer, Martin Kunz, Alessandro Melchiorri
We investigate the global texture model of structure formation in cosmogonies with non-zero cosmological constant for different values of the Hubble parameter. We find that the abs…
Generalized Einstein-Aether theories and the Solar System
Camille Bonvin, Ruth Durrer, Pedro G. Ferreira +2
It has been shown that generalized Einstein-Aether theories may lead to significant modifications to the non-relativistic limit of the Einstein equations. In this paper we study th…
The Cosmological Consistency Relation in a Universe with Structure
Varun Rustagi, Ruth Durrer
In this short paper we determine the effects of structure on the cosmological consistency relation which is valid in a perfect Friedmann Universe. We show that within CDM the c…
Probing the Cosmological Principle with CMB lensing and cosmic shear
James Adam, Roy Maartens, Julien Larena +2
The standard cosmological model assumes the Cosmological Principle. However, recent observations hint at possible violations of isotropy on large scales, possibly through late-time…
No-go theorem for k-essence dark energy
Camille Bonvin, Chiara Caprini, Ruth Durrer
We demonstrate that if k-essence can solve the coincidence problem and play the role of dark energy in the universe, the fluctuations of the field have to propagate superluminally…
A new way to test the Cosmological Principle: measuring our peculiar velocity and the large scale anisotropy independently
Tobias Nadolny, Ruth Durrer, Martin Kunz +1
We present a novel approach to disentangle two key contributions to the largest-scale anisotropy of the galaxy distribution: (i) the intrinsic dipole due to clustering and anisotro…
Early Reionization in Cosmology
Ruth Durrer
The cosmic microwave background (CMB) anisotropies have turned out to represent one of the most stringent 'bottle necks' for scenarios of large scale structure formation. As a poss…
Full-sky bispectrum in redshift space for 21cm intensity maps
Ruth Durrer, Mona Jalilvand, Rahul Kothari +2
We compute the tree-level bispectrum of 21cm intensity mapping after reionisation. We work in the directly observable angular and redshift space, focusing on equal-redshift correla…
The Cosmic Microwave Background: The history of its experimental investigation and its significance for cosmology
Ruth Durrer
This review describes the discovery of the cosmic microwave background radiation in 1965 and its impact on cosmology in the 50 years that followed. This discovery has established t…
Vector and Tensor Contributions to the Luminosity Distance
Enea Di Dio, Ruth Durrer
We compute the vector and tensor contributions to the luminosity distance fluctuations in first order perturbation theory and we expand them in spherical harmonics. This work prese…
Detecting rotation from lensing in the CMB
Julien Carron, Enea di Dio, Ruth Durrer
An excellent estimate of the lensing signal is expected from the availability of deep and high-resolution polarization data in the near future. This is most important to allow for…
Graviton production in anti-de Sitter braneworld cosmology: A fully consistent treatment of the boundary condition
Marcus Ruser, Ruth Durrer, Marc Vonlanthen +1
In recent work by two of us, [Durrer & Ruser, PRL 99, 071601 (2007); Ruser & Durrer PRD 76, 104014 (2007)], graviton production due to a moving spacetime boundary (braneworld) in a…
Redshift-space distortions from vector perturbations II: Anisotropic signal
Vittorio Tansella, Camille Bonvin, Giulia Cusin +3
We study the impact on the galaxy correlation function of the presence of a vector component in the tracers' peculiar velocities, in the case in which statistical isotropy is viola…
Magnetogenesis from early structure formation due to Yukawa forces
Ruth Durrer, Alexander Kusenko
Yukawa interactions can mediate relatively long-range attractive forces between fermions in the early universe. Such a globally attractive interaction creates an instability that c…
CMB anisotropies in pre-big bang cosmology
Filippo Vernizzi, Alessandro Melchiorri, Ruth Durrer
We present an alternative scenario for cosmic structure formation where initial fluctuations are due to Kalb-Ramond axions produced during a pre-big bang phase of inflation. We inv…
Bias and scatter in the Hubble diagram from cosmological large-scale structure
Julian Adamek, Chris Clarkson, Louis Coates +2
An important part of cosmological model fitting relies on correlating distance indicators of objects (for example type Ia supernovae) with their redshift, often illustrated on a Hu…
Gauge invariant cosmological perturbation theory for braneworlds
Alain Riazuelo, Filippo Vernizzi, Danièle Steer +1
We derive the gauge invariant perturbation equations for a 5-dimensional bulk spacetime in the presence of a brane. The equations are derived in full generality, without specifying…
The Generation of Vorticity in Cosmological N-body Simulations
Goran Jelic-Cizmek, Francesca Lepori, Julian Adamek +1
Clustering of a perfect fluid does not lead to the generation of vorticity. It is the collisionless nature of dark matter, inducing velocity dispersion and shell crossing, which is…
Curvature constraints from Large Scale Structure
Enea Di Dio, Francesco Montanari, Alvise Raccanelli +3
We modified the CLASS code in order to include relativistic galaxy number counts in spatially curved geometries; we present the formalism and study the effect of relativistic corre…
Testing General Relativity with Cosmological Large Scale Structure
Ruth Durrer
In this paper I investigate the possibility to test Einstein's equations with observations of cosmological large scale structure. I first show that we have not tested the equations…
The Alcock Paczynski test with Baryon Acoustic Oscillations: systematic effects for future surveys
Francesca Lepori, Enea Di Dio, Matteo Viel +2
We investigate the Alcock Paczynski (AP) test applied to the Baryon Acoustic Oscillation (BAO) feature in the galaxy correlation function. By using a general formalism that include…
Gravitational wave generation from bubble collisions in first-order phase transitions: an analytic approach
Chiara Caprini, Ruth Durrer, Geraldine Servant
Gravitational wave production from bubble collisions was calculated in the early nineties using numerical simulations. In this paper, we present an alternative analytic estimate, r…
The halo bias for number counts on the light cone from relativistic N-body simulations
Francesca Lepori, Sebastian Schulz, Julian Adamek +1
We present the halo number counts and its two-point statistics, the observable angular power spectrum, extracted for the first time from relativistic N-body simulations. The halo c…
Rotation of the CMB polarisation by foreground lensing
Enea Di Dio, Ruth Durrer, Giuseppe Fanizza +1
We investigate the weak lensing corrections to the CMB polarization anisotropies. We concentrate on the effect of rotation and show that the rotation of polarisation is a true phys…
Is Cosmology Compatible with Blue Gravity Waves ?
Roberta Camerini, Ruth Durrer, Alessandro Melchiorri +1
A primordial gravitational wave background with positive(blue) spectral index is expected in several non-standard inflationary cosmologies where the stress-energy tensor violates t…
CMB anisotropies from acausal scaling seeds
Sandro Scodeller, Martin Kunz, Ruth Durrer
We investigate models where structure formation is initiated by scaling seeds: We consider rapidly expanding relativistic shells of energy and show that they can fit current CMB an…
Primordial magnetic helicity evolution with a homogeneous magnetic field from inflation
Axel Brandenburg, Ruth Durrer, Yiwen Huang +3
Motivated by a scenario of magnetogenesis in which a homogeneous magnetic field is generated during inflation, we study the magnetohydrodynamic evolution of the primordial plasma m…
The Oscillating Universe: an Alternative to Inflation
Ruth Durrer, Joachim Laukenmann
The aim of this paper is to show, that the 'oscillating universe' is a viable alternative to inflation. We remind that this model provides a natural solution to the flatness or ent…
Anisotropies in the Cosmic Microwave Background: Theoretical Foundations
Ruth Durrer
The analysis of anisotropies in the cosmic microwave background (CMB) has become an extremely valuable tool for cosmology. We even have hopes that planned CMB anisotropy experiment…
Light Deflection in Perturbed Friedmann Universes
Ruth Durrer
In this letter a new formula for light deflection is derived using only physically observable concepts. The general result is specialized to cosmological perturbation theory and ex…
Microlensing modulation by quadrupole variation
Florian Dubath, Maria Alice Gasparini, Ruth Durrer
We investigate microlensing in the case where the lens is considered as an extended object. We use a multipolar expansion of the lens potential and show that the time-varying natur…
An Independent Measure of the Kinematic Dipole from SDSS
Prabhakar Tiwari, Dominik J. Schwarz, Gong-Bo Zhao +3
We utilize the Sloan Digital Sky Survey (SDSS) extended Baryon Oscillation Spectroscopic Survey (eBOSS) and Baryon Oscillation Spectroscopic Survey (BOSS) catalogs with precise spe…
Safely smoothing spacetime: backreaction in relativistic cosmological simulations
Julian Adamek, Chris Clarkson, David Daverio +2
A persistent theme in the study of dark energy is the question of whether it really exists or not. It is often claimed hat we are mis-calculating the cosmological model by neglecti…
Global textures and the Doppler peaks
Alejandro Gangui, Ruth Durrer, Mairi Sakellariadou
We review recent work aimed at showing how global topological defects influence the shape of the angular power spectrum of the CMB radiation on small scales. While Sachs-Wolfe fluc…
Small scale effects in the observable power spectrum at large angular scales
William L. Matthewson, Ruth Durrer
In this paper we show how effects from small scales can enter the angular-redshift power spectrum . In particular, we show that spectroscopic surveys with high redshi…
The Dipole of the Pantheon+SH0ES Data
Francesco Sorrenti, Ruth Durrer, Martin Kunz
In this paper we determine the dipole in the distance redshift relation from the Pantheon+ data. We find that, while its amplitude roughly agrees with the dipole found in the cosmi…
An Estimator for the lensing potential from galaxy number counts
Viraj Nistane, Mona Jalilvand, Julien Carron +2
We derive an estimator for the lensing potential from galaxy number counts which contains a linear and a quadratic term. We show that this estimator has a much larger signal-to-noi…
Towards Cosmography of the Local Universe
Julian Adamek, Chris Clarkson, Ruth Durrer +3
Anisotropies in the distance-redshift relation of cosmological sources are expected due to large-scale inhomogeneities in the local Universe. When the observed sources are tracing…
Testing braneworlds with the binary pulsar
Ruth Durrer, Philippe Kocian
In this letter we calculate the emission of gravity waves by the binary pulsar in the framework of five dimensional braneworlds. We consider only spacetimes with one compact extra-…
On graviton production in braneworld cosmology
Cyril Cartier, Ruth Durrer, Marcus Ruser
We study braneworlds in a five dimensional bulk, where cosmological expansion is mimicked by motion through AdS. We show that the five dimensional graviton reduces to the four…
Fast and spurious: a robust determination of our peculiar velocity with future galaxy surveys
Fabien Lacasa, Camille Bonvin, Charles Dalang +1
To date, the most precise measurement of the observer's peculiar velocity comes from the dipole in the Cosmic Microwave Background (CMB). This velocity also generates a dipole in t…
Non-linear contributions to angular power spectra
Mona Jalilvand, Basundhara Ghosh, Elisabetta Majerotto +3
Future galaxy clustering surveys will probe small scales where non-linearities become important. Since the number of modes accessible on intermediate to small scales is very high,…
Tensor Bounds on the Hidden Universe
Adrian del Rio, Ruth Durrer, Subodh P. Patil
During single clock inflation, hidden fields (i.e. fields coupled to the inflaton only gravitationally) in their adiabatic vacua can ordinarily only affect observables through virt…
Braneworlds
Ruth Durrer
This course is an introduction to the physics of braneworlds. We concentrate on braneworlds with only one extra-dimension and discuss their gravity. We derive the gravitational equ…
The observable statistics
Basundhara Ghosh, Ruth Durrer
Recently Moradinezhad Dizgah & Durrer have shown that the statistics, useful to test theories of modified gravity, is plagued by additional scale and bias dependent lensing c…
Gravitational waves from cosmological phase transitions
Ruth Durrer
I discuss the generation of a stochastic background of gravitational waves during a first order phase transition. I present simple general arguments which explain the main features…
Global field dynamics and cosmological tructure formation
Ruth Durrer
We discuss gravitational effects of global scalar fields and, especially, of global topological defects. We first give an introduction to the dynamics of global fields and the form…
Stability of Horndeski vector-tensor interactions
Jose Beltrán Jiménez, Ruth Durrer, Lavinia Heisenberg +1
We study the Horndeski vector-tensor theory that leads to second order equations of motion and contains a non-minimally coupled abelian gauge vector field. This theory is remarkabl…
General Relativistic N-body simulations in the weak field limit
Julian Adamek, David Daverio, Ruth Durrer +1
We develop a formalism for General Relativistic N-body simulations in the weak field regime, suitable for cosmological applications. The problem is kept tractable by retaining the…
Anchors no more: Using peculiar velocities to constrain and the primordial Universe without calibrators
Davide Piras, Francesco Sorrenti, Ruth Durrer +1
We develop a novel approach to constrain the Hubble parameter and the primordial power spectrum amplitude using type Ia supernovae (SNIa) data. By considering…
Scale-invariant Helical Magnetic Fields from Inflation
Tomohiro Fujita, Ruth Durrer
We discuss a model which can generate scale-invariant helical magnetic fields on large scales (Mpc) in the primordial universe. It is also shown that the electric condu…
Vorticity generation in the Universe: A perturbative approach
Giulia Cusin, Vittorio Tansella, Ruth Durrer
We compute the generation of vorticity from velocity dispersion in the dark matter fluid. For dark matter at zero temperature Helmholtz's theorem dictates that no vorticity is gene…
A local infall from a cosmographic analysis of Pantheon+
Francesco Sorrenti, Ruth Durrer, Martin Kunz
We present a model independent analysis of the Pantheon+ supernova sample and study the dependence of the recovered values of , and on the redshift cut and on the…