Results 11 to 20 of about 207,749 (157)
Observations of the Cosmic Microwave Background [PDF]
Nuclear Physics B - Proceedings Supplements, 1994 The properties of the cosmic microwave background radiation provide unique constraints on cosmological models, i.e. on the content, history, and evolution of the Universe. I discuss the latest measurements of the spectral and spatial properties of the cosmic microwave background radiation.
arxiv +4 more sources
arXiv, 1997 A short review of the measured spectrum of the Cosmic Microwave Background Radiation (CMBR) and implications. Extensions of the Kompaneets equation and Sunyaev-Zel'dovich effect are given.
Stebbins, Albert
arxiv +4 more sources
Cosmic Microwave Background Radiation Anisotropy Induced by Cosmic Strings [PDF]
arXiv, 1994 We report on a current investigation of the anisotropy pattern induced by cosmic strings on the cosmic microwave background radiation (MBR). We have numerically evolved a network of cosmic strings from a redshift of $Z = 100$ to the present and calculated the anisotropies which they induce.
Allen, B. +4 more
arxiv +3 more sources
Cosmic Inflation and Genetic Algorithms
Fortschritte der Physik, Volume 71, Issue 1, January 2023., 2023 Abstract Large classes of standard single‐field slow‐roll inflationary models consistent with the required number of e‐folds, the current bounds on the spectral index of scalar perturbations, the tensor‐to‐scalar ratio, and the scale of inflation can be efficiently constructed using genetic algorithms.
Steve A. Abel +3 more
wiley +1 more source
Balloon-borne Cosmic Microwave Background experiments [PDF]
EPJ Web of Conferences, 2019 Stratospheric balloon experiments play a unique role in current Cosmic Microwave Background (CMB) studies. CMB research has entered a precision phase, harvesting the detailed properties of its anisotropy, polarization and spectrum, at incredible ...
Masi Silvia +9 more
doaj +1 more source
Fast emulation of anisotropies induced in the cosmic microwave background by cosmic strings
The Open Journal of Astrophysics, 2023 Cosmic strings are linear topological defects that may have been produced during symmetry-breaking phase transitions in the very early Universe. In an expanding Universe the existence of causally separate regions prevents such symmetries from being ...
Matthew A. Price +5 more
doaj +2 more sources
Microwaves Are Everywhere
IEEE Journal of Microwaves, 2021 This article is the first in a continuing series of general interest papers on the applications of microwaves in areas of science and technology that might not be evident to the casual observer.
Peter H. Siegel
doaj +1 more source
The Boltzmann equation and Cosmic Microwave Background
Revista de Investigación de Física, 2023 Observations on the anisotropies of the Cosmic Microwave Background (CMB) have become a fundamental tool in Cosmology. We present a brief description of the mformalism necessary to understand the evolution of the anisotropies, and how their power ...
Mississippi Valenzuela
doaj +1 more source
Anisotropies of the cosmic microwave background [PDF]
La Rivista del Nuovo Cimento, 2002 We review the present status of Cosmic Microwave Background (CMB) anisotropy observations and discuss the main related astrophysical issues, instrumental effects and data analysis techniques. We summarise the balloon-borne and ground-based experiments that, after COBE-DMR, yielded detection or significant upper limits to CMB fluctuations.
M. Bersanelli, D. Maino, A. Mennella
openaire +5 more sources
Frequency–Redshift Relation of the Cosmic Microwave Background
Astronomy, 2023 We point out that a modified temperature–redshift relation (T-z relation) of the cosmic microwave background (CMB) cannot be deduced by any observational method that appeals to an a priori thermalisation to the CMB temperature T of the excited states in ...
Ralf Hofmann, Janning Meinert
doaj +1 more source