39 citations · 217 across the 15 of their papers we have counts for
15 papers
3D cosmic shear: numerical challenges, 3D lensing random fields generation and Minkowski Functionals for cosmological inference
A. Spurio Mancini, P. L. Taylor, R. Reischke +5
Cosmic shear - the weak gravitational lensing effect generated by fluctuations of the gravitational tidal fields of the large-scale structure - is one of the most promising tools f…
Investigating scalar-tensor-gravity with statistics of the cosmic large-scale structure
Robert Reischke, Alessio Spurio Mancini, Björn Malte Schäfer +1
Future observations of the large-scale structure have the potential to investigate cosmological models with a high degree of complexity, including the properties of gravity on larg…
Imitating intrinsic alignments: A bias to the CMB lensing-galaxy shape cross-correlation power spectrum induced by the large-scale structure bispectrum
Philipp M. Merkel, Bjoern Malte Schaefer
Cross-correlating the lensing signals of galaxies and comic microwave background (CMB) fluctuations is expected to provide valuable cosmological information. In particular it may h…
Parameter constraints from weak lensing tomography of galaxy shapes and cosmic microwave background fluctuations
Philipp M. Merkel, Bjoern Malte Schaefer
Recently, it has been shown that cross-correlating CMB lensing and 3D cosmic shear allows to considerably tighten cosmological parameter constraints. We investigate whether similar…
The cross-correlation between 3d cosmic shear and the integrated Sachs-Wolfe effect
Britta Zieser, Philipp M. Merkel
We present the first calculation of the cross-correlation between three-dimensional cosmic shear and the integrated Sachs-Wolfe (iSW) effect. Both signals are combined in a single…
Extreme value statistics of CMB lensing deflection angles
Philipp M. Merkel, Bjoern Malte Schaefer
The smaller the angular scales on which the anisotropies of the cosmic microwave background (CMB) are probed the more important their distortion due to gravitational lensing become…
Angular spectra of the intrinsic galaxy ellipticity field, their observability and their impact on lensing in tomographic surveys
Bjoern Malte Schaefer, Philipp M. Merkel
Subject of this paper are intrinsic ellipticity correlations between galaxies, their statistical properties, their observability with future surveys and their interference with wea…
Born-corrections to weak lensing of the cosmic microwave background temperature and polarisation anisotropies
Steffen Hagstotz, Björn Malte Schäfer, Philipp M. Merkel
Many weak lensing calculations make use of the Born approximation where the light ray is approximated by a straight path. We examine the effect of Born-corrections for lensing of t…
A theoretical estimate of intrinsic ellipticity bispectra induced by angular momenta alignments
Philipp M. Merkel, Bjoern Malte Schaefer
Intrinsically aligned galaxy shapes are one of the most important systematics in cosmic shear measurements. So far theoretical studies of intrinsic alignments almost exclusively fo…
Intrinsic alignments and 3d weak gravitational lensing
Philipp M. Merkel, Bjoern Malte Schaefer
In this paper we show how intrinsic alignments can be incorporated consistently in the formalism of 3d weak lensing. We use two different descriptions of the intrinsic galaxy ellip…
Contributions to the nonlinear integrated Sachs-Wolfe effect: Birkinshaw-Gull effect and gravitational self-energy density
Philipp Merkel, Bjoern Malte Schaefer
In this paper, we recompute contributions to the spectrum of the nonlinear integrated Sachs-Wolfe (iSW)/Rees-Sciama effect in a dark energy cosmology. Focusing on the moderate nonl…
Parameter likelihood of intrinsic ellipticity correlations
Federica Capranico, Philipp Merkel, Bjoern Malte Schaefer
Subject of this paper are the statistical properties of ellipticity alignments between galaxies evoked by their coupled angular momenta. Starting from physical angular momentum mod…
The interplay of CMB temperature lensing power reconstruction with primordial non-Gaussianity of local type
Philipp M. Merkel, Bjoern Malte Schaefer
In the current era of high-precision CMB experiments, the imprint of gravitational lensing on the CMB temperature is exploited as a source of valuable information. Especially the r…
Galactic angular momenta and angular momentum couplings in the large-scale structure
Bjoern Malte Schaefer, Philipp Merkel
In this paper, we revisit the aquisition of angular momentum of galaxies by tidal shearing and compute the angular momentum variance sigma_L^2 as well as the angular momentum corre…
Gravitational lensing of the cosmic microwave background by nonlinear structures
Philipp Merkel, Bjoern Malte Schaefer
Weak gravitational lensing changes the angular power spectra of the cosmic microwave background (CMB) temperature and polarization in a characteristic way containing valuable infor…