Results 111 to 120 of about 132,304 (298)

Testing Isotropy of Cosmic Microwave Background Radiation

open access: yes, 2007
We introduce new symmetry-based methods to test for isotropy in cosmic microwave background radiation. Each angular multipole is factored into unique products of power eigenvectors, related multipoles and singular values that provide 2 new rotationally ...
Jain, Pankaj   +3 more
core   +2 more sources

THE COSMIC MICROWAVE BACKGROUND RADIATION* [PDF]

open access: yesAnnals of the New York Academy of Sciences, 1981
Because angular anisotropies and spectral distortions of the cosmic microwave background radiation are judged to be inevitable at some level, in a realistic cosmological model, the evidence for spectral distortions and its theoretical implications are described.
openaire   +1 more source

Cosmic Microwave Background and Inflation Parameters

open access: yesInternational Journal of Theoretical Physics, 2004
24 pages, 10 figures, 2 tables, Int. J. Theor. Phys. 2004, ed. E. Verdaguer, "Peyresq Physics 8", "The Early Universe: Confronting theory with observations" (June 21-27, 2003)
Bond, J. Richard   +3 more
openaire   +3 more sources

Cosmic microwave background constraints on primordial black hole dark matter [PDF]

open access: yes, 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

An Inversion of Magnetic Field Measurements to Constrain the Depth, Thickness, and Conductivity of Europa's Ocean

open access: yesJournal of Geophysical Research: Planets, Volume 130, Issue 10, October 2025.
Abstract The Galilean satellite Europa is a primary candidate for the study of ocean worlds. In anticipation of NASA's Europa Clipper and ESA's JUICE missions, we revisit the magnetic field measurements of the Galileo spacecraft. The ocean's induction response is governed by its induction amplitude and phase shift, which are a function of the ocean ...
Jason Winkenstern   +2 more
wiley   +1 more source

Perspectives for Cosmological Reionization From Future CMB and Radio Projects

open access: yesFrontiers in Astronomy and Space Sciences, 2018
In spite of the great recent results from the Planck satellite supporting cosmological reionization scenarios almost compatible with astrophysical models for the evolution of structure, galaxy and star formation, the full understanding of the ...
Tiziana Trombetti   +4 more
doaj   +1 more source

Tropical Tropopause Layer Evolution During QBO Disruptions

open access: yesJournal of Geophysical Research: Atmospheres, Volume 130, Issue 18, 28 September 2025.
Abstract The tropical tropopause layer (TTL) is studied during 2015/16 and 2019/20 quasi‐biennial oscillation (QBO) disruption events using GNSS‐RO and SWOOSH satellite observations and the ERA5 reanalysis. By compositing temperature, water vapor, and tropical upwelling during different phases of QBO and QBO disruptions (XQBO), we show that XQBO events
Lan Luan   +3 more
wiley   +1 more source

On parton distributions in a photon gas

open access: yes, 2009
In some cases it may be useful to know parton distributions in a photon gas. This may be relevant, e.g., for the analysis of interactions of high energy cosmic ray particles with the cosmic microwave background radiation.
A. Ringwald   +27 more
core   +1 more source

Near‐ground microwave radiometry for on‐the‐go surface soil moisture sensing in micro‐irrigated orchards in California

open access: yesAgrosystems, Geosciences &Environment, Volume 8, Issue 3, September 2025.
Abstract High‐resolution geospatial soil moisture measurements are needed to inform hydrological modeling and to guide water management in agriculture, especially in highly heterogeneous systems such as micro‐irrigated orchards. In this research, we used a Portable L‐band Radiometer (PoLRa) to map very high‐resolution (<2 m) soil surface moisture in ...
Elia Scudiero   +7 more
wiley   +1 more source

Information Gains from Cosmic Microwave Background Experiments

open access: yes, 2014
To shed light on the fundamental problems posed by Dark Energy and Dark Matter, a large number of experiments have been performed and combined to constrain cosmological models.
Akeret, Joël   +4 more
core   +1 more source

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