CMB polarization impact on cosmological constraints

Das, Sudeep; Linder, Eric V.

doi:10.1103/physrevd.86.063520

Cited by 5 publications

(6 citation statements)

References 44 publications

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“…Both the lenses and BAO are strong in constraining the curvature of the universe, while SN provides more information on the dark energy equation of state. Lenses are thus highly complementary to other cosmographic probes, particularly the CMB and SN (see also, e.g., Linder 2011; Das & Linder 2012). Each probe is consistent with flat ΛCDM: Ω k = 0 and w = −1 are within the 95% credible regions.…”

Section: Comparison Of Lenses and Other Cosmographic Probesmentioning

confidence: 78%

Two Accurate Time-Delay Distances From Strong Lensing: Implications for Cosmology

Suyu

Auger

Hilbert

et al. 2013

ApJ

379

553

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Strong gravitational lenses with measured time delays between the multiple images and models of the lens mass distribution allow a one-step determination of the time-delay distance, and thus a measure of cosmological parameters. We present a blind analysis of the gravitational lens RXJ1131−1231 incorporating (1) the newly measured time delays from COSMOGRAIL, the COSmological MOnitoring of GRAvItational Lenses, (2) archival Hubble Space Telescope imaging of the lens system, (3) a new velocity-dispersion measurement of the lens galaxy of 323 ± 20 km s −1 based on Keck spectroscopy, and (4) a characterization of the line-of-sight structures via observations of the lens' environment and ray tracing through the Millennium Simulation. Our blind analysis is designed to prevent experimenter bias. The joint analysis of the data sets allows a time-delay distance measurement to 6% precision that takes into account all known systematic uncertainties. Time-delay lenses constrain especially tightly the Hubble constant H 0 (5.7% and 4.0% respectively in wCDM and open ΛCDM) and curvature of the universe. The overall information content is similar to that of Baryon Acoustic Oscillation experiments. Thus, they complement well other cosmological probes, and provide an independent check of unknown systematics. Our measurement of the Hubble constant is completely independent of those based on the local distance ladder method, providing an important consistency check of the standard cosmological model and of general relativity.

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Section: Comparison Of Lenses and Other Cosmographic Probesmentioning

confidence: 78%

Two Accurate Time-Delay Distances From Strong Lensing: Implications for Cosmology

Suyu

Auger

Hilbert

et al. 2013

ApJ

379

553

View full text Add to dashboard Cite

show abstract

“…We include CMB lensing through the deflection angle power spectrum as prescribed by [26]. (See [27] for its use in constraints on the gravity parameter γ.) For constraints on the expansion history we employ simulated supernova distance-redshift measurements of 1800 supernovae over z = 0-1.5 with a systematic floor of 0.02(1 + z)/2.5 magnitudes, and include the supernova absolute magnitude parameter M as a nuisance parameter.…”

Section: Galaxy Redshift Survey Sciencementioning

confidence: 99%

Constraining cosmic expansion and gravity with galaxy redshift surveys

Daniel

Linder

2013

J. Cosmol. Astropart. Phys.

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We analyze the science reach of a next generation galaxy redshift survey such as BigBOSS to fit simultaneously for time varying dark energy equation of state and time-and scale-dependent gravity. The simultaneous fit avoids potential bias from assuming ΛCDM expansion or general relativity and leads to only modest degradation in constraints. Galaxy bias, fit freely in redshift bins, is self calibrated by spectroscopic measurements of redshift space distortions and causes little impact. The combination of galaxy redshift, cosmic microwave background, and supernova distance data can deliver 5-10% constraints on 6 model independent modified gravity quantities.

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“…This weak lensing effect on the CMB (see Lewis & Challinor 2006 for an extensive review) therefore offers a unique probe of the matter distribution at intermediate redshift where the forming LSS were still in the nearly-linear regime. Because this depends on the cumulative matter distribution in the Universe, it is expected to be particularly efficient in constraining the properties of all the parameters affecting the growth of LSS, such as neutrino masses and dark energy physics (de Putter et al 2009;Das & Linder 2012;Hall & Challinor 2012).…”

Section: Introductionmentioning

confidence: 99%

High-precision simulations of the weak lensing effect on cosmic microwave background polarization

Fabbian

Stompor

2013

A&A

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We studied the accuracy, robustness, and self-consistency of pixel-domain simulations of the gravitational lensing effect on the primordial cosmic microwave background (CMB) anisotropies due to the large-scale structure of the Universe. In particular, we investigated the dependence of the precision of the results precision on some crucial parameters of these techniques and propose a semi-analytic framework to determine their values so that the required precision is a priori assured and the numerical workload simultaneously optimized. Our focus was on the B-mode signal, but we also discuss other CMB observables, such as the total intensity, T , and E-mode polarization, emphasizing differences and similarities between all these cases. Our semi-analytic considerations are backed up by extensive numerical results. Those are obtained using a code, nicknamed lenS 2 HAT -for lensing using scalable spherical harmonic transforms (S 2 HAT) -which we have developed in the course of this work. The code implements a version of the previously described pixel-domain approach and permits performing the simulations at very high resolutions and data volumes, thanks to its efficient parallelization provided by the S 2 HAT library -a parallel library for calculating of the spherical harmonic transforms. The code is made publicly available.

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CMB polarization impact on cosmological constraints

Cited by 5 publications

References 44 publications

Two Accurate Time-Delay Distances From Strong Lensing: Implications for Cosmology

Two Accurate Time-Delay Distances From Strong Lensing: Implications for Cosmology

Constraining cosmic expansion and gravity with galaxy redshift surveys

High-precision simulations of the weak lensing effect on cosmic microwave background polarization

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