Results 81 to 90 of about 256,877 (297)
Prospects for Measuring Cosmic Microwave Background Spectral Distortions in the Presence of Foregrounds [PDF]
, 2017 Measurements of cosmic microwave background spectral distortions have profound implications for our understanding of physical processes taking place over a vast window in cosmological history.
M. Abitbol +3 more
semanticscholar +1 more source
Uncovering the history of cosmic inflation from anomalies in cosmic microwave background spectra
European Physical Journal C: Particles and Fields, 2022 We propose an inflationary primordial feature model that can explain both the large and small-scale anomalies in the currently measured cosmic microwave background anisotropy spectra, revealing a clip of adventurous history of the Universe during its ...
Matteo Braglia +2 more
doaj +1 more source
Cosmic Microwave Background Anisotropy Observing Strategy Assessment [PDF]
, 1996 I develop a method for assessing the ability of an instrument, coupled with an observing strategy, to measure the angular power spectrum of the cosmic microwave background (CMB).
Lloyd Knox, Tegmark M.
core +2 more sources
Probing the statistic in the cosmic microwave background [PDF]
Mod.Phys.Lett.A24:1187-1192,2009, 2009 Kolmogorov's statistic is used for the analysis of properties of perturbations in the Cosmic Microwave Background signal. We obtain the maps of the Kolmogorov stochasticity parameter for W and V band temperature data of WMAP which are differently affected by the Galactic disk radiation and then we model datasets with various statistic of perturbations.
arxiv +1 more source
Cosmic Strings and Their Induced Non-Gaussianities in the Cosmic Microwave Background
Advances in Astronomy, 2010 Motivated by the fact that cosmological perturbations of inflationary quantum origin were born Gaussian, the search for non-Gaussianities in the cosmic microwave background (CMB) anisotropies is considered as the privileged probe of nonlinear physics in ...
Christophe Ringeval
doaj +1 more source
Dark Energy with Phantom Crossing and the H0 Tension
Entropy, 2021 We investigate the possibility of phantom crossing in the dark energy sector and the solution for the Hubble tension between early and late universe observations.
Eleonora Di Valentino +2 more
doaj +1 more source
The Cosmic Microwave Background Bispectrum and Inflation [PDF]
, 1999 We derive an expression for the non-Gaussian cosmic-microwave-background (CMB) statistic $I_l^3$ defined recently by Ferreira, Magueijo, and G\'orski in terms of the slow-roll-inflation parameters $\epsilon$ and $\eta$.
A. A. Starobinsky +23 more
core +2 more sources
Exploring Dark Photon Production and Kinetic Mixing Constraints in Heavy‐Ion Collisions
Astronomische Nachrichten, EarlyView.ABSTRACT Vector U‐bosons, often referred to as “dark photons,” are potential candidates for mediating dark matter interactions. In this study, we outline a procedure to derive theoretical constraints on the upper bound of the kinetic mixing parameter ϵ2MU$$ {\upvarepsilon}^2\left({M}_U\right) $$ using dilepton data from heavy‐ion from SIS to RHIC ...
Adrian William Romero Jorge +3 more
wiley +1 more source
Adapted Method for Separating Kinetic SZ Signal from Primary CMB Fluctuations
EURASIP Journal on Advances in Signal Processing, 2005 In this first attempt to extract a map of the kinetic Sunyaev-Zel'dovich (KSZ) temperature fluctuations from the cosmic microwave background (CMB) anisotropies, we use a method which is based on simple and minimal assumptions.
Forni Olivier, Aghanim Nabila
doaj +1 more source
Cosmic microwave background constraints on primordial black hole dark matter [PDF]
, 2016 We revisit cosmic microwave background (CMB) constraints on primordial black hole dark matter. Spectral distortion limits from COBE/FIRAS do not impose a relevant constraint. Planck CMB anisotropy power spectra imply that primordial black holes with mBH≳
Daniel Aloni, Kfir Blum, R. Flauger
semanticscholar +1 more source