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Probing dark energy evolution with Quaia quasars through the integrated Sachs-Wolfe effect
M. Ghodsi Yengejeh, J. R. Bermejo-Climent, A. Kovács +2
The Integrated Sachs--Wolfe (ISW) effect probes the late-time evolution of gravitational potentials and provides a complementary test of the nature of dark energy. We investigate w…
STEPSIC: Initial condition generator for stereographic cosmological simulations
Balázs Pál, Gábor Rácz, István Csabai +1
Conventional cosmological initial condition generators are designed exclusively for fully periodic cubic domains and cannot produce the non-periodic, observer-centric configuration…
Cylindrical cosmological simulations with StePS
Gábor Rácz, Viola H. Varga, Balázs Pál +3
The global topology of the Universe can affect long-range gravitational forces via boundary conditions. Detailed studies of non-trivial topologies require simulations that natively…
Integrated Sachs-Wolfe maps from the Gower Street CDM simulations
Mina Ghodsi Yengejeh, András Kovács, István Szapudi +1
The late-time linear Integrated Sachs-Wolfe (ISW) effect directly probes the dynamics of cosmic acceleration and the nature of dark energy. Detecting these weak, secondary temperat…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Constraints on AvERA Cosmologies from Cosmic Chronometers and Type Ia Supernovae
Adrienn Pataki, Péter Raffai, István Csabai +2
We constrain AvERA cosmologies in comparison with the flat CDM model using cosmic chronometer (CC) data and the Pantheon+ sample of type Ia supernovae (SNe Ia). The analysis inc…
The CMB lensing imprint of cosmic voids detected in the WISE-Pan-STARRS luminous red galaxy catalog
G. Camacho-Ciurana, P. Lee, N. Arsenov +3
The cross-correlation of cosmic voids with the lensing convergence () map of the CMB fluctuations offers a powerful tool to refine our understanding of the dark sector in the co…
Complementary Cosmological Simulations
Gábor Rácz, Alina Kiessling, István Csabai +1
Cosmic variance limits the accuracy of cosmological N-body simulations, introducing bias in statistics such as the power spectrum, halo mass function, or the cosmic shear. We provi…
Evidence for a high-z ISW signal from supervoids in the distribution of eBOSS quasars
A. Kovács, R. Beck, A. Smith +3
The late-time integrated Sachs-Wolfe (ISW) imprint of super-structures is sourced by evolving large-scale potentials due to a dominant dark energy co…
An empirical nonlinear power spectrum overdensity-response
Gábor Rácz, István Szapudi, István Csabai
Context. The overdensity inside a cosmological sub-volume and the tidal fields from its surroundings affect the matter distribution of the region. The resulting difference between…
The anisotropy of the power spectrum in periodic cosmological simulations
Gábor Rácz, István Szapudi, István Csabai +1
The classical gravitational force on a torus is anisotropic and always lower than Newton's law. We demonstrate the effects of periodicity in dark matter only -body simul…
A common explanation of the Hubble tension and anomalous cold spots in the CMB
András Kovács, Róbert Beck, István Szapudi +3
The standard cosmological paradigm narrates a reassuring story of a universe currently dominated by an enigmatic dark energy component. Disquietingly, its universal explaining powe…
Weak lensing cosmology with convolutional neural networks on noisy data
Dezső Ribli, Bálint Ármin Pataki, José Manuel Zorrilla Matilla +3
Weak gravitational lensing is one of the most promising cosmological probes of the late universe. Several large ongoing (DES, KiDS, HSC) and planned (LSST, EUCLID, WFIRST) astronom…
Galaxy shape measurement with convolutional neural networks
Dezső Ribli, László Dobos, István Csabai
We present our results from training and evaluating a convolutional neural network (CNN) to predict galaxy shapes from wide-field survey images of the first data release of the Dar…
StePS: A Multi-GPU Cosmological N-body Code for Compactified Simulations
Gábor Rácz, István Szapudi, László Dobos +2
We present the multi-GPU realization of the StePS (Stereographically Projected Cosmological Simulations) algorithm with MPI-OpenMP-CUDA hybrid parallelization and nearly ideal scal…
An improved cosmological parameter inference scheme motivated by deep learning
Dezső Ribli, Bálint Ármin Pataki, István Csabai
Dark matter cannot be observed directly, but its weak gravitational lensing slightly distorts the apparent shapes of background galaxies, making weak lensing one of the most promis…
The integrated Sachs-Wolfe effect in the AvERA cosmology
Róbert Beck, István Csabai, Gábor Rácz +1
The recent AvERA cosmological simulation of Rácz et al. (2017) has a -like expansion history and removes the tension between local and Planck (cosmic microwave backg…
Compactified Cosmological Simulations of the Infinite Universe
Gábor Rácz, István Szapudi, István Csabai +1
We present a novel -body simulation method that compactifies the infinite spatial extent of the Universe into a finite sphere with isotropic boundary conditions to follow the ev…
Concordance cosmology without dark energy
Gábor Rácz, László Dobos, Róbert Beck +2
According to the separate universe conjecture, spherically symmetric sub-regions in an isotropic universe behave like mini-universes with their own cosmological parameters. This is…
Objective Identification of Informative Wavelength Regions in Galaxy Spectra
Ching-Wa Yip, Michael Mahoney, Alex Szalay +4
Understanding the diversity in spectra is the key to determining the physical parameters of galaxies. The optical spectra of galaxies are highly convoluted with continuum and lines…
Refined position angle measurements for galaxies of the SDSS Stripe 82 co-added dataset
József Varga, István Csabai, László Dobos
Position angle measurements of Sloan Digital Sky Survey (SDSS) galaxies, as measured by the surface brightness profile fitting code of the SDSS photometric pipeline (Lupton 2001),…
Revealing a strongly reddened, faint active galactic nucleus population by stacking deep co-added images
József Varga, István Csabai, László Dobos
More than half of the sources identified by recent radio sky surveys have not been detected by wide-field optical surveys. We present a study based on our co-added image stacking t…
A High Resolution Atlas of Composite SDSS Galaxy Spectra
László Dobos, István Csabai, Ching-Wa Yip +3
In this work we present an atlas of composite spectra of galaxies based on the data of the Sloan Digital Sky Survey Data Release 7 (SDSS DR7). Galaxies are classified by colour, nu…
Correlations between Nebular Emission and the Continuum Spectral Shape in SDSS Galaxies
Zsuzsanna Győry, Alexander S. Szalay, Tamás Budavári +2
We present a statistical study of the correlations and dimensionality of emission lines carried out on a sample of over 40,000 Sloan Digital Sky Survey (SDSS) galaxies. Using princ…