Results 31 to 40 of about 49,997 (277)

Cosmic birefringence fluctuations and cosmic microwave background B-mode polarization

Physics Letters B, 2015
Recently, BICEP2 measurements of the cosmic microwave background (CMB) B-mode polarization has indicated the presence of primordial gravitational waves at degree angular scales, inferring the tensor-to-scalar ratio of r=0.2 and a running scalar spectral ...
Seokcheon Lee, Guo-Chin Liu, Kin-Wang Ng
doaj   +1 more source

Clustering of hotspots in the cosmic microwave background [PDF]

EPJ Web of Conferences, 2019
The physics behind the origin and composition of the Cosmic Microwave Background (CMB) is a well-established topic in the field of Cosmology. Literature on CMB anisotropies reveal consistency with Gaussianity [1], but these were conducted on full multi ...
Low En Zuo Joel, Yang Abel
doaj   +1 more source

Improved Constraints on Cosmology and Foregrounds from BICEP2 and Keck Array Cosmic Microwave Background Data with Inclusion of 95 GHz Band. [PDF]

Physical Review Letters, 2015
We present results from an analysis of all data taken by the BICEP2 and Keck Array cosmic microwave background (CMB) polarization experiments up to and including the 2014 observing season. This includes the first Keck Array observations at 95 GHz.
Keck Array, BICEP2 Collaborations P. A. R. Ade, Z. Ahmed, R. Aikin, K. D. Alexander, D. Barkats, S. Benton, C. Bischoff, J. Bock, R. Bowens-Rubin, J. A. Brevik, I. Buder, E. Bullock, V. Buza, J. Connors, B. Crill, L. Duband, C. Dvorkin, J. Filippini, S. Fliescher, J. Grayson, M. Halpern, S. Harrison, G. Hilton, H. Hui, K. D. Irwin, K. Karkare, E. Karpel, J. Kaufman, B. Keating, S. Kefeli, S. A. Kernasovskiy, J. Kovac, C. Kuo, E. Leitch, M. Lueker, K. Megerian, C. Netterfield, H. Nguyen, R. O’Brient, IV R.W.Ogburn, A. Orlando, C. Pryke, S. Richter, R. Schwarz, C. Sheehy, Z. K. Staniszewski, B. Steinbach, R. Sudiwala, G. Teply, K. Thompson, J. E. Tolan, C. Tucker, A. Turner, A. Vieregg, A. Weber, D. Wiebe, J. Willmert, C. Wong, W. L. K. Wu, K. University, Kipacslac, S. University, Caltech, HarvardCfA, U. Toronto, Nasa Jpl, M. I. O. Astrophysics, Harvard, Sbt Grenoble, U. I. Urbana-Champaign, U. Minnesota, U. Columbia, Nist, Ucsd, KICPChicago, Canadian Institute for Advanced Research, U. Chicago   +77 more
semanticscholar   +1 more source

The Cosmic Microwave Background [PDF]

Symposium - International Astronomical Union, 1987
This review summarizes recent observational work on the cosmic microwave background, or 3 K radiation. Recent measurements of its spectrum and large-scale angular distribution are described, as well as searches for small angular scale fluctuations on arcsecond to degree scales.
openaire   +2 more sources

The cosmic microwave background radiation [PDF]

Physics Reports, 2000
We summarize the theoretical and observational status of the study of the Cosmic Microwave Background radiation. Its thermodynamic spectrum is a robust prediction of the Hot Big Bang cosmology and has been confirmed observationally. There are now 76 observations of Cosmic Microwave Background anisotropy, which we present in a table with references.
Eric Gawiser, Joseph Silk, Joseph Silk
openaire   +3 more sources

CMB anomalies and the effects of local features of the inflaton potential

European Physical Journal C: Particles and Fields, 2017
Recent analysis of the WMAP and Planck data have shown the presence of a dip and a bump in the spectrum of primordial perturbations at the scales $$k=0.002$$ k = 0.002 Mpc $${}^{-1}$$ - 1 and $$k=0.0035$$ k = 0.0035 Mpc $${}^{-1}$$ - 1 , respectively. We
Alexander Gallego Cadavid, Antonio Enea Romano, Stefano Gariazzo   +2 more
doaj   +1 more source

Running and Running of the Running of the Scalar Spectral Index in Warm Inflation

Universe, 2023
The next generation of cosmological observations are expected to improve the measurements of several quantities connected to the primordial inflation in the early Universe.
Suratna Das, Rudnei O. Ramos
doaj   +1 more source

Cosmic microwave background limits on accreting primordial black holes [PDF]

, 2016
Interest in the idea that primordial black holes (PBHs) might comprise some or all of the dark matter has recently been rekindled following LIGO’s first direct detection of a binary-black-hole merger.
Y. Ali-Haimoud, M. Kamionkowski
semanticscholar   +1 more source

The cosmic microwave background [PDF]

Physics World, 2003
Cosmologists can lay claim to addressing some of the most dramatic problems that humankind has to face. In trying to find the origin of the universe and describe its subsequent evolution, it is not surprising that extravagant assertions are made. I sometimes feel that I belong to a legion of researchers suffering from delusions of grandeur.
openaire   +2 more sources

Table of contents [PDF]

IEEE Signal Processing Magazine, 2010
We aim to present a tutorial on the detection, parameter estimation and statistical analysis of compact sources (far galaxies, galaxy clusters and Galactic dense emission regions) in cosmic microwave background observations. The topic is of great relevance for current and future cosmic microwave background missions because the presence of compact ...
Herranz, D., Vielva, Patricio
openaire   +6 more sources