839 citations · 24.6k across the 409 of their papers we have counts for
410 papers
Free-floating "planets'' in the macrolensed quasar Q2237+0305
Artem Tuntsov, Geraint Lewis, Mark Walker
It has been claimed that the variability of field quasars resembles gravitational lensing by a large cosmological population of free-floating planets with mass of about 10 Earths.…
The Redshift Difference in Gravitational Lensed Systems: A Novel Probe of Cosmology
Chengyi Wang, Krzysztof Bolejko, Geraint F. Lewis
The exploration of the redshift drift, a direct measurement of cosmological expansion, is expected to take several decades of observation with stable, sensitive instruments. We int…
RomAndromeda: The Roman Survey of the Andromeda Halo
Arjun Dey, Joan Najita, Carrie Filion +50
As our nearest large neighbor, the Andromeda Galaxy provides a unique laboratory for investigating galaxy formation and the distribution and substructure properties of dark matter…
Detection of the Cosmological Time Dilation of High Redshift Quasars
Geraint F. Lewis, Brendon J. Brewer
A fundamental prediction of relativistic cosmologies is that, due to the expansion of space, observations of the distant cosmos should be time dilated and appear to run slower than…
Testing the Cosmological Principle: On the Time Dilation of Distant Sources
Oliver T. Oayda, Geraint F. Lewis
We present a novel test of the cosmological principle: the idea that, on sufficiently large scales, the universe should appear homogeneous and isotropic to observers comoving with…
The GALAH survey: New diffuse interstellar bands found in residuals of 872,000 stellar spectra
Rok Vogrinčič, Janez Kos, Tomaž Zwitter +11
We use more than 872,000 mid-to-high resolution (R 20,000) spectra of stars from the GALAH survey to discern the spectra of diffuse interstellar bands (DIBs). We use four wi…