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Synergies between intensity maps of hydrogen lines
(Oxford University Press, 2018)
We study synergies between Hi 21cm and Hα intensity map observations, focusing on SKA1-
like and SPHEREx-like surveys. We forecast how well such a combination can measure features
in the angular power spectrum on the ...
The observed galaxy bispectrum from single-field inflation in the squeezed limit
(IOP Publishing, 2018)
Using the consistency relation in Fourier space, we derive the observed galaxy bispectrum from
single- eld in
ation in the squeezed limit, in which one of the three modes has a wavelength much
longer than the other two. ...
The kinematic dipole in galaxy redshift surveys
(IOP Publishing, 2018)
In the concordance model of the Universe, the matter distribution { as observed in galaxy number
counts or the intensity of line emission (such as the 21cm line of neutral hydrogen) - should have
a kinematic dipole due ...
Null tests of the cosmological constant using supernovae
(American Physical Society, 2014)
The standard concordance model of the Universe is based on the cosmological constant as the
driver of accelerating expansion. This concordance model is being subjected to a growing range
of inter-locking observations. ...
Clustering of quintessence on horizon scales and its imprint on HI intensity mapping
(IOP Science, 2013)
Quintessence can cluster only on horizon scales. What is the effect on the observed matter distribution? To answer this, we need a relativistic approach that goes beyond the standard Newtonian
calculation and deals properly ...
Anti-lensing: the bright side of voids
(American Physical Society, 2013)
More than half of the volume of our Universe is occupied by cosmic voids. The lensing magni ca-
tion e ect from those under-dense regions is generally thought to give a small dimming contribution:
objects on the far side ...
Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle
(IOP Science, 2013)
A suggested solution to the dark energy problem is the void model, where accelerated expansion is
replaced by Hubble-scale inhomogeneity. In these models, density perturbations grow on a radially
inhomogeneous background. ...
Einstein's legacy in galaxy surveys
(Oxford University Press, 2015)
Non-Gaussianity in the primordial fluctuations that seeded structure formation produces a signal in the galaxy power spectrum on very large scales. This signal contains vital information about the primordial Universe, but ...
Improvements in cosmological constraints from breaking growth degeneracy
(EDP Sciences, 2020)
The key probes of the growth of a large-scale structure are its rate f and amplitude σ8. Redshift space distortions in the galaxy power spectrum allow us to measure only the combination fσ8, which can be used to constrain ...
The Hubble constant tension with next-generation galaxy surveys
(IOP Publishing Ltd, 2020)
The rate at which the universe is expanding today is a fundamental parameter in
cosmology which governs our understanding of structure formation and dark energy. However, current measurements of the Hubble constant, H0, ...