255 citations · 627 across the 24 of their papers we have counts for
13 papers · 1 filter
A Giant Ring on the sky
Alexia M. Lopez, Roger G. Clowes
We present the discovery of `A Giant Ring on the Sky' (GR); a ring-like, ultra-large-scale structure at z~0.8, located in the same field that contains the previously-documented Gia…
Gigaparsec structures are nowhere to be seen in CDM: an enhanced analysis of LSS in FLAMINGO-10K simulations
A. M Lopez, R. G. Clowes
Recently, Sawala et al. 2025 claimed to refute the cosmological significance of the Giant Arc based on their analysis of the FLAMINGO-10K simulation data. In our paper here, we hig…
Investigating Ultra-Large Large-Scale Structures: Potential Implications for Cosmology
Alexia M. Lopez, Roger G. Clowes, Gerard M. Williger
Large-scale structure (LSS) studies in cosmology map and analyse matter in the Universe on the largest scales. Understanding the LSS can provide observational support for the Cosmo…
A Big Ring on the Sky
Alexia M. Lopez, Roger G. Clowes, Gerard M. Williger
We present the discovery of `A Big Ring on the Sky' (BR), the second ultra-large large-scale structure (uLSS) found in MgII-absorber catalogues, following the previously reported G…
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…
Correlated orientations of the axes of large quasar groups on Gpc scales
Tracey Friday, Roger G. Clowes, Gerard M. Williger
Correlated orientations of quasar optical and radio polarisation, and of radio jets, have been reported on Gpc scales, possibly arising from intrinsic alignment of spin axes. Optic…
A Giant Arc on the Sky
Alexia M. Lopez, Roger G. Clowes, Gerard M. Williger
We present the serendipitous discovery of a `Giant Arc on the Sky' at . The Giant Arc (GA) spans Gpc (proper size, present epoch), and appears to be almost sym…
Accidental deep field bias in CMB T and SNe correlation
Tracey Friday, Roger G. Clowes, Srinivasan Raghunathan +1
Evidence presented by Yershov, Orlov and Raikov apparently showed that the WMAP/Planck cosmic microwave background (CMB) pixel-temperatures (T) at supernovae (SNe) locations tend t…
Compatibility of the Large Quasar Groups with the Concordance Cosmological Model
Gabriel E. Marinello, Roger G. Clowes, Luis E. Campusano +3
We study the compatibility of large quasar groups with the concordance cosmological model. Large Quasar Groups are very large spatial associations of quasars in the cosmic web, wit…
Environments of Strong / Ultrastrong, Ultraviolet Fe II Emitting Quasars
Roger G. Clowes, Srinivasan Raghunathan, Ilona K. Soechting +2
We have investigated the strength of ultraviolet Fe II emission from quasars within the environments of Large Quasar Groups (LQGs) in comparison with quasars elsewhere, for 1.1 <=…
A structure in the early universe at z ~ 1.3 that exceeds the homogeneity scale of the R-W concordance cosmology
Roger G. Clowes, Kathryn A. Harris, Srinivasan Raghunathan +3
A Large Quasar Group (LQG) of particularly large size and high membership has been identified in the DR7QSO catalogue of the Sloan Digital Sky Survey. It has characteristic size (v…
Two close Large Quasar Groups of size ~ 350 Mpc at z ~ 1.2
Roger G. Clowes, Luis E. Campusano, Matthew J. Graham +1
The Clowes & Campusano (1991) Large Quasar Group (LQG) at <z> = 1.28 has been re-examined using the quasar data from the DR7QSO catalogue of the Sloan Digital Sky Survey. In the 19…
The Clowes-Campusano Large Quasar Group Survey: I. GALEX selected sample of LBGs at z1
L. Haberzettl, G. M. Williger, J. T. Lauroesch +10
The nature of galaxy structures on large scales is a key observational prediction for current models of galaxy formation. The SDSS and 2dF galaxy surveys have revealed a number of…