Results 121 to 130 of about 128,427 (267)
Systematic Distortion in Cosmic Microwave Background Maps
, 2009 To minimize instrumentally induced systematic errors, cosmic microwave background (CMB) anisotropy experiments measure temperature differences across the sky using paires of horn antennas, temperature map is recovered from temperature differences ...
C. Bennett +6 more
core +1 more source
Limits to Global Rotation and Shear From the COBE DMR 4-Year Sky Maps [PDF]
, 1997 Small departures from a homogeneous isotropic spacetime create observable features in the large-scale anisotropy of the cosmic microwave background. We cross-correlate the maps of the cosmic microwave background anisotropy from the Cosmic Background ...
Banday, A. J., Hinshaw, G., Kogut, A.
core +2 more sources
Cosmic Microwave Background Acoustic Peak Locations [PDF]
, 2016 The Planck collaboration has measured the temperature and polarization of the cosmic microwave background well enough to determine the locations of eight peaks in the temperature (TT) power spectrum, five peaks in the polarization (EE) power spectrum and
Z. Pan +3 more
semanticscholar +1 more source
Imprints of quantum gravity in the cosmic microwave background
European Physical Journal C: Particles and Fields, 2019 It has been shown that the spectrum of quantum gravity contains at least two new modes in addition to the massless graviton: a massive spin-0 and a massive spin-2.
Xavier Calmet +2 more
doaj +1 more source
Magneto-optic effects of the cosmic microwave background
Nuclear Physics B, 2018 Generation of magneto-optic effects by the interaction of the CMB with cosmic magnetic fields is studied. Effects which generate polarization such as the Cotton–Mouton effect, vacuum polarization and photon–pseudoscalar mixing in external magnetic field ...
Damian Ejlli
doaj
Cosmic microwave background and inflation in multi-fractional spacetimes [PDF]
, 2016 We use FIRAS and PLANCK 2015 data to place observational bounds on inflationary scenarios in multi-fractional spacetimes with q-derivatives. While a power-law expansion in the geometric time coordinate is subject to the usual constraints from the tensor ...
G. Calcagni, S. Kuroyanagi, S. Tsujikawa
semanticscholar +1 more source
Separation of Correlated Astrophysical Sources Using Multiple-Lag Data Covariance Matrices
EURASIP Journal on Advances in Signal Processing, 2005 This paper proposes a new strategy to separate astrophysical sources that are mutually correlated. This strategy is based on second-order statistics and exploits prior information about the possible structure of the mixing matrix.
Baccigalupi C +5 more
doaj +1 more source
ƒ(R) Gravity, Relic Coherent Gravitons and Optical Chaos
Galaxies, 2014 We discuss the production of massive relic coherent gravitons in a particular class of ƒ(R) gravity, which arises from string theory, and their possible imprint in the Cosmic Microwave Background.
Lawrence B. Crowell, Christian Corda
doaj +1 more source
Reionization and the cosmic microwave background
, 2008 6 pages, plain Tex, figures can be requested from frost@bkyast.berkeley.edu, CfPA-94-th ...
openaire +4 more sources
A Cosmic Microwave Background feature consistent with a cosmic texture
, 2007 The Cosmic Microwave Background provides our most ancient image of the Universe and our best tool for studying its early evolution. Theories of high energy physics predict the formation of various types of topological defects in the very early universe ...
E. Martinez-Gonzalez +6 more
core +1 more source