Results 61 to 70 of about 49,997 (277)

Cosmic microwave background constraints on coupled dark matter

open access: yesPhysics Letters B, 2015
We study CMB constraints on a scenario where a fraction of dark matter is non-minimally coupled to a massless scalar field and dark energy is in the form of a cosmological constant.
Sophie C.F. Morris, Anne M. Green
doaj   +1 more source

Prospects for Measuring Cosmic Microwave Background Spectral Distortions in the Presence of Foregrounds [PDF]

open access: yes, 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

Delensing of Cosmic Microwave Background Polarization with Machine Learning

open access: yesThe Astrophysical Journal Supplement Series, 2023
Primordial B -mode detection is one of the main goals of next-generation cosmic microwave background (CMB) experiments. Primordial B -modes are a unique signature of primordial gravitational waves (PGWs).
Ye-Peng Yan   +3 more
doaj   +1 more source

Recovering Cosmic Microwave Background Polarization Signals with Machine Learning

open access: yesThe Astrophysical Journal, 2023
Primordial B-mode detection is one of the main goals of current and future cosmic microwave background (CMB) experiments. However, the weak B-mode signal is overshadowed by several Galactic polarized emissions, such as thermal dust emission and ...
Ye-Peng Yan   +3 more
doaj   +1 more source

Impacts of atmospheric river reconnaissance dropsondes on ECMWF Integrated Forecasting System precipitation forecasts

open access: yesQuarterly Journal of the Royal Meteorological Society, EarlyView.
Impacts of Atmospheric River Reconnaissance dropsonde observations on precipitation forecasts over the U.S. West Coast are examined in the European Centre for Medium‐Range Weather Forecasts (ECMWF) Integrated Forecasting System (IFS), using observing‐system experiments.
Jia Wang   +7 more
wiley   +1 more source

Cosmic Strings and Their Induced Non-Gaussianities in the Cosmic Microwave Background

open access: yesAdvances 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

Primordial circular polarization in the cosmic microwave background

open access: yesPhysics Letters B, 2019
Circular (“V-mode”) polarization is expected to be vanishing in the CMB, since it is not produced in Thomson scattering. However, considering that the conventional CMB anisotropies are generated via an early universe mechanism such as inflation or a ...
Stephon Alexander, Evan McDonough
doaj   +1 more source

Relieving the tension between weak lensing and cosmic microwave background with interacting dark matter and dark energy models [PDF]

open access: yes, 2017
We constrain interacting dark matter and dark energy (IDMDE) models using a 450-degree-square cosmic shear data from the Kilo Degree Survey (KiDS) and the angular power spectra from Planck's latest cosmic microwave background measurements. We revisit the
Rui An, C. Feng, Bin Wang
semanticscholar   +1 more source

Expected value, to a point: Moral decision‐making under background uncertainty

open access: yesNoûs, EarlyView.
Abstract Expected value maximization gives plausible guidance for moral decision‐making under uncertainty in many situations. But it has unappetizing implications in ‘Pascalian’ situations involving tiny probabilities of extreme outcomes. This paper shows, first, that under realistic levels of ‘background uncertainty’ about sources of value independent
Christian Tarsney
wiley   +1 more source

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