Stephen A. Appleby

Local patch analysis of ACT DR6 convergence map using morphological statistics

Anonymous, Nidharssan S, Pravabati Chingangbam, F. Rahman et autres

in, us, kr (code pays fourni par la source)

Morphological signatures of gravitational evolution, redshift-space distortions, and massive neutrinos in large-scale structure

Priya Goyal, Stephen A. Appleby, Pravabati Chingangbam, Changbom Park

Abstract We investigate the morphological properties of large-scale structure in the Universe and the physical processes that modify the excursion-set morphology of the three-dimensional matter density field. Using the Quijote N-body simulation suite, we study how an initially Gaussian random matter density …

kr, in (code pays fourni par la source)

The CatWISE2020 Quasar Dipole: A Reassessment of the Cosmic Dipole Anomaly

M. A. Bashir, Pravabati Chingangbam, Stephen A. Appleby

Abstract The Ellis–Baldwin test probes the cosmological principle by comparing the kinematic cosmic microwave background dipole with the Doppler-driven dipole in the number counts of extragalactic radio sources. Recent analysis of the CatWISE2020 quasar catalog has reported a number-count dipole amplitude exceeding …

in, kr (code pays fourni par la source)

Non-Gaussian Expansion of Minkowski Tensors in Redshift Space

Stephen A. Appleby, Christophe Pichon, Pravabati Chingangbam, D. Pogosyan

Abstract This paper focuses on extending the use of Minkowski tensors to analyze anisotropic signals in cosmological data, focusing on those introduced by redshift space distortions. We derive the ensemble average of the two translation-invariant, rank-2 Minkowski tensors ( W 1 0 …

kr, fr, in, ca (code pays fourni par la source)

The topology of Rayleigh-Levy flights in two dimensions

Reginald Christian Bernardo, Stephen A. Appleby, Francis Bernardeau, Christophe Pichon

Rayleigh-Lévy flights are simplified cosmological tools that capture certain essential statistical properties of the cosmic density field, including hierarchical structures in higher-order correlations, making them a valuable reference for studying the highly non-linear regime of structure formation. Unlike standard Markovian processes, they …

kr, de, fr, au (code pays fourni par la source)

Isotropy Test with Quasars Using Method of Smoothed Residuals

Akhil Antony, Stephen A. Appleby, William L. Matthewson, Arman Shafieloo

To assess the significance and scale dependence of anomalous large scale modes in the CatWISE quasar data, we generate smoothed number density fields on the sphere and study their extreme values -- maximum, minimum, maximum antipodal difference. By comparing these summary statistics …

Toward a test of Gaussianity of a gravitational wave background

Reginald Christian Bernardo, Stephen A. Appleby, Kin‐Wang Ng

Abstract The degree of Gaussianity of a field offers insights into its cosmological nature, and its statistical properties serve as indicators of its Gaussianity. In this work, we examine the signatures of Gaussianity in a gravitational wave background (GWB) by analyzing the …

kr, tw (code pays fourni par la source)

Topological Approach to Void Finding Applied to the SDSS Galaxy Map

Manu Aggarwal, Motonari Tonegawa, Stephen A. Appleby, Changbom Park et autres

Abstract The structure of the low redshift Universe is dominated by a multiscale void distribution delineated by filaments and walls of galaxies. The characteristics of voids, such as morphology, average density profile, and correlation function, can be used as cosmological probes. However, …

us, kr (code pays fourni par la source)

Topological approach to void finding applied to the SDSS galaxy map

Manu Aggarwal, Motonari Tonegawa, Stephen A. Appleby, Changbom Park et autres

The structure of the low redshift Universe is dominated by a multi-scale void distribution delineated by filaments and walls of galaxies. The characteristics of voids; such as morphology, average density profile, and correlation function, can be used as cosmological probes. However, their …

Testing Lyα Emitters and Lyman-break Galaxies as Tracers of Large-scale Structures at High Redshifts

Sang Hyeok Im, Ho Seong Hwang, Jaehong Park, Jaehyun Lee et autres

Abstract We test whether Lyα emitters (LAEs) and Lyman-break galaxies (LBGs) can be good tracers of high-z large-scale structures, using the Horizon Run 5 cosmological hydrodynamical simulation. We identify LAEs using the Lyα emission line luminosity and its equivalent width, and LBGs …

Testing Lyman Alpha Emitters and Lyman-Break Galaxies as Tracers of Large-Scale Structures at High Redshifts

Sang Hyeok Im, Ho Seong Hwang, Jaehong Park, Jaehyun Lee et autres

We test whether Lyman alpha emitters (LAEs) and Lyman-break galaxies (LBGs) can be good tracers of high-z large-scale structures, using the Horizon Run 5 cosmological hydrodynamical simulation. We identify LAEs using the Lyα emission line luminosity and its equivalent width, and LBGs …

Toward a test of Gaussianity of a gravitational wave background

Reginald Christian Bernardo, Stephen A. Appleby, Kin‐Wang Ng

The degree of Gaussianity of a field offers insights into its cosmological nature, and its statistical properties serve as indicators of its Gaussianity. In this work, we examine the signatures of Gaussianity in a gravitational wave background (GWB) by analyzing the cumulants …