255 citations · 700 across the 13 of their papers we have counts for
12 papers · 1 filter
Redshift Dependence of Dipole in Pantheon+ Supernovae
M. H. Jalali-Kanafi, E. Ó Colgáin, S. Pourojaghi +1
We examine the dipole structure in the local cosmic expansion rate using the Pantheon+ compilation of Type Ia supernovae. We reconstruct directional maps of across the…
Anisotropic Distance Ladder in Pantheon+ Supernovae
Ruairí McConville, Eoin Ó Colgáin
We decompose Pantheon+ Type Ia supernovae (SN) in hemispheres on the sky finding angular variations up to km/s/Mpc in the Hubble constant both in the SH0ES redshift range…
increases with effective redshift in CDM cosmology
Shahnawaz A. Adil, Özgür Akarsu, Mohammad Malekjani +4
Hubble constant and weighted amplitude of matter fluctuations determinations are biased to higher and lower values, respectively, in the late Universe with respect to e…
On Redshift Evolution & Negative Dark Energy Density in Pantheon+ Supernovae
Mohammad Malekjani, Ruairí Mc Conville, Eoin Ó Colgáin +2
Within the Friedmann-Lemaître-Robertson-Walker (FLRW) framework, the Hubble constant is an integration constant. Thus, consistency of the model demands observational constanc…
High Redshift CDM Cosmology: To Bin or not to Bin?
Eoin Ó Colgáin, M. M. Sheikh-Jabbari, Rance Solomon
We construct observational Hubble and angular diameter distance mock data with baseline Planck CDM input values, before fitting the CDM model to study evolu…
Inevitable manifestation of wiggles in the expansion of the late Universe
Ozgur Akarsu, Eoin O. Colgain, Emre Ozulker +2
Using the fact that the comoving angular diameter distance to the last scattering surface is strictly constrained almost model independently, we show that, for any model agreeing w…
Is the Observable Universe Consistent with the Cosmological Principle?
Pavan Kumar Aluri, Paolo Cea, Pravabati Chingangbam +20
The Cosmological Principle (CP) -- the notion that the Universe is spatially isotropic and homogeneous on large scales -- underlies a century of progress in cosmology. It is conven…
Putting Flat CDM In The (Redshift) Bin
Eoin Ó Colgáin, M. M. Sheikh-Jabbari, Rance Solomon +2
Flat CDM cosmology is specified by two constant fitting parameters at the background level in the late Universe, the Hubble constant and matter density (today) . Math…
Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
Elcio Abdalla, Guillermo Franco Abellán, Amin Aboubrahim +200
In this paper we will list a few important goals that need to be addressed in the next decade, also taking into account the current discordances between the different cosmological…
Probing the Anisotropic Universe with Gravitational Waves
Eoin Ó Colgáin
Modern cosmology rests on the working assumption that the Universe is isotropic and homogeneous at large scales. Here, we document a number of anomalous observations pointing to an…
Revealing Intrinsic Flat CDM Biases with Standardizable Candles
Eoin Ó Colgáin, M. M. Sheikh-Jabbari, Rance Solomon +4
Emerging high redshift cosmological probes, in particular quasars (QSOs), show a preference for larger matter densities, , within the flat CDM framework. Here,…
On Larger Values in the CMB Dipole Direction
Orlando Luongo, Marco Muccino, Eoin Ó Colgáin +2
On the assumption that quasars (QSO) and gamma-ray bursts (GRB) represent \textit{standardisable candles}, we provide evidence that the Hubble constant adopts larger values i…