Search Publications
Constraining multiplicative bias in CFHTLenS weak lensing shear data
Hill, J. Colin; Liu, Jia; Ortiz-Vazquez, Alvaro
Several recent cosmological analyses have found tension between constraints derived from the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) data and those derived from other data sets, such as the Planck cosmic microwave background (CMB) temperature anisotropies. Similarly, a direct cross-correlation of the CFHTLenS data with Planck CMB …
Solving 3D relativistic hydrodynamical problems with weighted essentially nonoscillatory discontinuous Galerkin methods
Dietrich, Tim; Bugner, Marcus; Bernuzzi, Sebastiano +2 more
Discontinuous Galerkin (DG) methods coupled to weighted essentially nonoscillatory (WENO) algorithms allow high order convergence for smooth problems and for the simulation of discontinuities and shocks. In this work, we investigate WENO-DG algorithms in the context of numerical general relativity, in particular for general relativistic hydrodynam…
Observational effects of a running Planck mass
Huang, Zhiqi
We consider observational effects of a running effective Planck mass in the scalar-tensor gravity theory. At the background level, an increasing effective Planck mass allows a larger Hubble constant H0, which is more compatible with the local direct measurements. At the perturbative level, for cosmic microwave background (CMB) anisotrop…
Planck constraints on scalar-tensor cosmology and the variation of the gravitational constant
Ichiki, Kiyotomo; Sugiyama, Naoshi; Ooba, Junpei +1 more
Cosmological constraints on the scalar-tensor theory of gravity by analyzing the angular power spectrum data of the cosmic microwave background (CMB) obtained from the Planck 2015 results are presented. We consider the harmonic attractor model, in which the scalar field has a harmonic potential with curvature (β ) in the Einstein frame and the the…
f (R )-gravity model of the Sunyaev-Zeldovich profile of the Coma cluster compatible with Planck data
De Martino, I.
In the weak-field limit, analytic f (R ) models of gravity introduce a Yukawa-like correction to the Newtonian gravitational potential. These models have been widely tested at galactic scales and provide an alternative explanation to the dynamics of galaxies without Dark Matter. We study if the temperature anisotropies due to the thermal Sunyaev-Z…
Bayesian analysis of inflationary features in Planck and SDSS data
Benetti, Micol; Alcaniz, Jailson S.
We perform a Bayesian analysis to study possible features in the primordial inflationary power spectrum of scalar perturbations. In particular, we analyze the possibility of detecting the imprint of these primordial features in the anisotropy temperature power spectrum of the cosmic microwave background (CMB) and also in the matter power spectrum …
Constraining spatial variations of the fine structure constant using clusters of galaxies and Planck data
Martins, C. J. A. P.; Kocevski, D.; Ebeling, H. +1 more
We propose an improved methodology to constrain spatial variations of the fine structure constant using clusters of galaxies. We use the Planck 2013 data to measure the thermal Sunyaev-Zeldovich effect at the location of 618 x-ray selected clusters. We then use a Monte Carlo Markov Chain algorithm to obtain the temperature of the cosmic microwave …
ν generation: Present and future constraints on neutrino masses from global analysis of cosmology and laboratory experiments
Melchiorri, Alessandro; Gerbino, Martina; Lattanzi, Massimiliano
We perform a joint analysis of current data from cosmology and laboratory experiments to constrain the neutrino mass parameters in the framework of Bayesian statistics, also accounting for uncertainties in nuclear modeling, relevant for neutrinoless double β decay (0 ν 2 β ) searches. We find that a combination of current oscillation, cosmological…
Quantum cosmology and the evolution of inflationary spectra
Kamenshchik, Alexander Y.; Tronconi, Alessandro; Venturi, Giovanni
We illustrate how it is possible to calculate the quantum gravitational effects on the spectra of primordial scalar/tensor perturbations starting from the canonical, Wheeler-De Witt, approach to quantum cosmology. The composite matter-gravity system is analyzed through a Born-Oppenheimer approach in which gravitation is associated with the heavy d…
Cosmology with photometric weak lensing surveys: Constraints with redshift tomography of convergence peaks and moments
Haiman, Zoltán; May, Morgan; Petri, Andrea
Weak gravitational lensing is becoming a mature technique for constraining cosmological parameters, and future surveys will be able to constrain the dark energy equation of state w . When analyzing galaxy surveys, redshift information has proven to be a valuable addition to angular shear correlations. We forecast parameter constraints on the tripl…