Results 61 to 70 of about 132,304 (298)

Kolmogorov cosmic microwave background sky

, 2009
A new map of the sky representing the degree of randomness in the cosmic microwave background (CMB) temperature has been obtained. The map based on estimation of the Kolmogorov stochasticity parameter clearly distinguishes the contribution of the ...
A. A. Kocharyan, A. E. Allahverdyan, A. L. Kashin, Arnold, Copi, E. Poghosian, Eriksen, G. Yegorian, Gurzadyan, Gurzadyan, Gurzadyan, Gurzadyan, Gurzadyan, Gurzadyan, Górski, H. G. Khachatryan, H. Kuloghlian, Inoue, Kolmogorov, Kovac, Rudnick, S. Mirzoyan, Smoot, T. Ghahramanyan, V. G. Gurzadyan, Vielva, Wiltshire   +26 more
core   +1 more source

Cosmic microwave background constraints on coupled dark matter

Physics 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

Non-Gaussianity and the Cosmic Microwave Background Anisotropies

Advances in Astronomy, 2010
We review in a pedagogical way the present status of the impact of non-Gaussianity (NG) on the cosmic microwave background (CMB) anisotropies. We first show how to set the initial conditions at second order for the CMB anisotropies when some primordial ...
N. Bartolo, S. Matarrese, A. Riotto
doaj   +1 more source

Delensing of Cosmic Microwave Background Polarization with Machine Learning

The 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, Guo-Jian Wang, Si-Yu Li, Jun-Qing Xia   +3 more
doaj   +1 more source

Polarization of Cosmic Microwave Background

, 2016
In this work we present an extension of the ROMA map-making code for data analysis of Cosmic Microwave Background polarization, with particular attention given to the inflationary polarization B-modes.
Buzzelli, Alessandro, Cabella, Paolo, de Gasperis, Giancarlo, Vittorio, Nicola   +3 more
core   +1 more source

Recovering Cosmic Microwave Background Polarization Signals with Machine Learning

The 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, Guo-Jian Wang, Si-Yu Li, Jun-Qing Xia   +3 more
doaj   +1 more source

Evading the pulsar constraints on the cosmic string tension in supergravity inflation

, 2012
The cosmic string is a useful probe of the early Universe and may give us a clue to physics at high energy scales where any artificial particle accelerators cannot reach.
, , A. Vilenkin, C. Ringeval, F.A. Jenet ., J. Dunkley ., J. Rocher, J. Urrestilla, Jun'ichi Yokoyama, K. Nakayama, Kohei Kamada, L. Lorenz, M. Hindmarsh, P. Amaro-Seoane ., P. Binetruy, Planck collaboration, R. Jeannerot, R. Jeannerot, R. van Haasteren ., R.A. Battye, S. Kawamura ., T. Kibble, WMAP collaboration, Yuhei Miyamoto   +23 more
core   +1 more source

Hybrid loop quantum cosmology and predictions for the cosmic microwave background [PDF]

, 2017
We investigate the consequences of the hybrid quantization approach for primordial perturbations in loop quantum cosmology, obtaining predictions for the cosmic microwave background and comparing them with data collected by the Planck mission.
Laura Castell'o Gomar, D. M. Blas, G. A. M. Marug'an, J. Olmedo   +3 more
semanticscholar   +1 more source

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

Quarterly 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, David A. Lavers, Luca Delle Monache, Bruce Ingleby, Minghua Zheng, Xingren Wu, Fred Martin Ralph, Florian Pappenberger   +7 more
wiley   +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