Higher-order statistics of shear field via a machine learning approach
Sign Up to like & getrecommendations! Published in 2020 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/202038715
Abstract: The unprecedented amount and the excellent quality of lensing data that the upcoming ground- and space-based surveys will produce represent a great opportunity to shed light on the questions that still remain unanswered concerning our… read more here.
Keywords: shear field; order; machine learning; order statistics ... See more keywords
Cosmological parameters, shear maps and power spectra from CFHTLenS using Bayesian hierarchical inference
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stw3161
Abstract: We apply two Bayesian hierarchical inference schemes to infer shear power spectra, shear maps and cosmological parameters from the CFHTLenS weak lensing survey - the first application of this method to data. In the first… read more here.
Keywords: power spectra; shear maps; cosmological parameters; bayesian hierarchical ... See more keywords
Precision matrix expansion – efficient use of numerical simulations in estimating errors on cosmological parameters
Sign Up to like & getrecommendations! Published in 2018 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx2566
Abstract: Computing the inverse covariance matrix (or precision matrix) of large data vectors is crucial in weak lensing (and multiprobe) analyses of the large-scale structure of the Universe. Analytically computed covariances are noise-free and hence straightforward… read more here.
Keywords: numerical simulations; cosmological parameters; precision matrix; covariance ... See more keywords
First cosmology results using Type IA supernovae from the dark energy survey: effects of chromatic corrections to supernova photometry on measurements of cosmological parameters
Sign Up to like & getrecommendations! Published in 2019 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stz619
Abstract: Calibration uncertainties have been the leading systematic uncertainty in recent analyses using Type Ia supernovae (SNe Ia) to measure cosmological parameters. To improve the calibration, we present the application of spectral energy distribution-dependent ‘chromatic corrections’ to… read more here.
Keywords: chromatic corrections; energy; cosmology; dark energy ... See more keywords
Gravitational wave interference via gravitational lensing: Measurements of luminosity distance, lens mass, and cosmological parameters
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.101.064011
Abstract: The gravitational lensing of gravitational waves might cause beat patterns detectable by interferometers. The feature of this kind of signal is the existence of the beat pattern in the early inspiral phase, followed by seemly… read more here.
Keywords: luminosity distance; cosmological parameters; gravitational wave; gravitational lensing ... See more keywords
Breaking the degeneracy between polarization efficiency and cosmological parameters in CMB experiments
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review D"
DOI: 10.1103/physrevd.104.023518
Abstract: Silvia Galli,1, * W. L. Kimmy Wu,2, 3, † Karim Benabed,1 François Bouchet,1 Thomas M. Crawford,3, 4 and Eric Hivon1 1Sorbonne Université, CNRS, Institut d’Astrophysique de Paris, 98 bis Boulevard Arago, F-75014 Paris, France 2SLAC… read more here.
Keywords: parameters cmb; breaking degeneracy; polarization efficiency; degeneracy polarization ... See more keywords
Constraints on a scale-dependent bias from galaxy clustering
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.95.023505
Abstract: We forecast the future constraints on scale-dependent parametrizations of galaxy bias and their impact on the estimate of cosmological parameters from the power spectrum of galaxies measured in a spectroscopic redshift survey. For the latter… read more here.
Keywords: constraints scale; survey; dependent bias; scale dependent ... See more keywords
Inflationary Features and Shifts in Cosmological Parameters From Planck 2015 Data
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.96.083526
Abstract: We explore the relationship between features in the Planck 2015 temperature and polarization data, shifts in the cosmological parameters, and features from inflation. Residuals in the temperature data at low multipole $\ell$, which are responsible… read more here.
Keywords: inflationary features; planck 2015; features shifts; cosmological parameters ... See more keywords
Deconfinement transition effects on cosmological parameters and primordial gravitational waves spectrum
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.023007
Abstract: The cosmological evolution can be described in terms of directly measurable cosmological scalar parameters (deceleration $q$, jerk $j$, snap $s$, etc...) constructed out of high order derivatives of the scale factor. Their behavior at the… read more here.
Keywords: deconfinement transition; gravitational waves; transition; transition effects ... See more keywords
Determination of Cosmological Parameters with a Sample of Quasars
Sign Up to like & getrecommendations! Published in 2018 at "Astronomy Reports"
DOI: 10.1134/s1063772918030022
Abstract: We use a sample of 808 quasars selected by Risaliti and Lusso to estimate two important cosmological parameters: the percentage of matter in the Universe Ωm and the Hubble constant. The method is based on… read more here.
Keywords: parameters sample; sample quasars; astronomy; hubble constant ... See more keywords
Study of some cosmological parameters in logarithmic corrected f(R) gravitational model with swampland conjectures
Sign Up to like & getrecommendations! Published in 2021 at "Modern Physics Letters A"
DOI: 10.1142/s0217732321500279
Abstract: In this paper, we use corrected f(R) gravitational model which is a polynomial function with a logarithmic term. We employ the slow-roll conditions and obtain the number of cosmological parameters.... read more here.
Keywords: gravitational model; parameters logarithmic; study cosmological; corrected gravitational ... See more keywords