52 citations · 344 across the 19 of their papers we have counts for
19 papers
Impact of lensing magnification on the power spectrum turnover
Yolanda Dube, Roy Maartens, Bikash R. Dinda +2
The turnover scale of the matter power spectrum -- and consequently of the standard galaxy power spectrum monopole -- encodes a fundamental signature of matter-radiation equa…
Unbiased analysis of primordial non-Gaussianity: the multipoles of the full relativistic power spectrum
Chris Addis, Sêcloka L. Guedezounme, Jessie Hammond +5
A major goal of ongoing and future cosmological surveys of the large-scale structure is to measure local type primordial non-Gaussianity in the galaxy power spectrum through the sc…
Turnover detection using the power spectrum and bispectrum
Yolanda Dube, Bikash R. Dinda, Sheean Jolicoeur +1
The turnover at the peak of the Fourier matter power spectrum encodes a fundamental signature of matter-radiation equality in the early Universe. This delivers a potential standard…
Primordial non-Gaussianity -- the effects of relativistic and wide-angle corrections to the power spectrum
Sêcloka L. Guedezounme, Sheean Jolicoeur, Roy Maartens
Wide-angle and relativistic corrections to the Newtonian and flat-sky approximations are important for accurate modeling of the galaxy power spectrum of next-generation galaxy surv…
Constraining primordial non-Gaussianity by combining photometric galaxy and 21cm intensity mapping surveys
Mponeng Kopana, Sheean Jolicoeur, Roy Maartens
The fluctuations produced during cosmic inflation may exhibit non-Gaussian characteristics that are imprinted in the large-scale structure of the Universe. This non-Gaussian imprin…
Relativistic and wide-angle corrections to galaxy power spectra
Sheean Jolicoeur, Sêcloka L. Guedezounme, Roy Maartens +3
Galaxy surveys contain information on the largest scales via wide-angle and relativistic contributions. By combining two different galaxy populations, we can suppress the strong co…
Multi-tracing the primordial Universe with future surveys
Mponeng Kopana, Sheean Jolicoeur, Roy Maartens
The fluctuations generated by Inflation are nearly Gaussian in the simplest models, but may be non-Gaussian in more complex models, potentially leading to signatures in the late Un…
Constraining the growth rate on linear scales by combining SKAO and DESI surveys
Simthembile Dlamini, Sheean Jolicoeur, Roy Maartens
In the pursuit of understanding the large-scale structure of the Universe, the synergy between complementary cosmological surveys has proven to be a powerful tool. Using multiple t…
Constraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys
Sheean Jolicoeur, Roy Maartens, Simthembile Dlamini
Surveys of the matter distribution contain `fossil' information on possible non-Gaussianity that is generated in the primordial Universe. This primordial signal survives only on th…
Magnification and evolution biases in large-scale structure surveys
Roy Maartens, José Fonseca, Stefano Camera +3
Measurements of galaxy clustering in upcoming surveys such as those planned for the Euclid and Roman satellites, and the SKA Observatory, will be sensitive to distortions from lens…
Local primordial non-Gaussianity in the relativistic galaxy bispectrum
Roy Maartens, Sheean Jolicoeur, Obinna Umeh +2
Next-generation galaxy and 21cm intensity mapping surveys will rely on a combination of the power spectrum and bispectrum for high-precision measurements of primordial non-Gaussian…
Detecting the relativistic bispectrum in 21cm intensity maps
Sheean Jolicoeur, Roy Maartens, Eline M. De Weerd +3
We investigate the detectability of leading-order relativistic effects in the bispectrum of future 21cm intensity mapping surveys. The relativistic signal arises from Doppler and o…
Multipoles of the relativistic galaxy bispectrum
Eline M. de Weerd, Chris Clarkson, Sheean Jolicoeur +2
Above the equality scale the galaxy bispectrum will be a key probe for measuring primordial non-Gaussianity which can help differentiate between different inflationary models and o…
Detecting the relativistic galaxy bispectrum
Roy Maartens, Sheean Jolicoeur, Obinna Umeh +3
The Fourier-space galaxy bispectrum is complex, with the imaginary part arising from leading-order relativistic corrections, due to Doppler, gravitational redshift and related line…
The dipole of the galaxy bispectrum
Chris Clarkson, Eline M. de Weerd, Sheean Jolicoeur +2
The bispectrum will play an important role in future galaxy surveys. On large scales it is a key probe for measuring primordial non-Gaussianity which can help differentiate between…
Imprints of local lightcone projection effects on the galaxy bispectrum IV: Second-order vector and tensor contributions
Sheean Jolicoeur, Alireza Allahyari, Chris Clarkson +3
The galaxy bispectrum on scales around and above the equality scale receives contributions from relativistic effects. Some of these arise from lightcone deformation effects, which…
Imprints of local lightcone projection effects on the galaxy bispectrum. III Relativistic corrections from nonlinear dynamical evolution on large-scales
Sheean Jolicoeur, Obinna Umeh, Roy Maartens +1
The galaxy bispectrum is affected on equality scales and above by relativistic observational effects, at linear and nonlinear order. These lightcone effects include local contribut…
Imprints of local lightcone projection effects on the galaxy bispectrum. II
Sheean Jolicoeur, Obinna Umeh, Roy Maartens +1
General relativistic imprints on the galaxy bispectrum arise from observational (or projection) effects. The lightcone projection effects include local contributions from Doppler a…
A general relativistic signature in the galaxy bispectrum: the local effects of observing on the lightcone
Obinna Umeh, Sheean Jolicoeur, Roy Maartens +1
Next-generation galaxy surveys will increasingly rely on the galaxy bispectrum to improve cosmological constraints, especially on primordial non-Gaussianity. A key theoretical requ…