Results 61 to 70 of about 257,498 (300)
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
Neutrinos and Cosmology: an update [PDF]
, 2005 We review the current cosmological status of neutrinos, with particular emphasis on their effects on Big Bang Nucleosynthesis, Large Scale Structure of the universe and Cosmic Microwave Background Radiation measurements.Comment: 4 pages, 1 figure, to ...
Pisanti, Ofelia, Serpico, P. D.
core +2 more sources
Observations of the Cosmic Microwave Background [PDF]
, 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 +1 more source
Radiation in equilibrium with plasma and plasma effects on cosmic microwave background [PDF]
Phys. Rev. E 100, 023202 (2019), 2019 The spectrum of the radiation of a body in equilibrium is given by Planck's law. In plasma, however, waves below the plasma frequency cannot propagate; consequently, the equilibrium radiation inside plasma is necessarily different from the Planck spectrum.
arxiv +1 more source
Patchy Kinetic Sunyaev–Zel’dovich Effect with Controlled Reionization History and Morphology
The Astrophysical Journal, 2023 Using the novel semi-numerical code for reionization AMBER, we model the patchy kinetic Sunyaev–Zel’dovich (kSZ) effect by directly specifying the reionization history with the redshift midpoint z _mid , duration Δ _z , and asymmetry A _z .
Nianyi Chen +3 more
doaj +1 more source
Photon-graviton conversion in a primordial magnetic field and the cosmic microwave background [PDF]
Phys.Rev. D54 (1996) 4757-4759, 1996 We reconsider the effects of photon-graviton conversion in a primordial magnetic field upon the cosmic microwave background radiation. We argue that plasma effects make the photon-graviton conversion process negligible.
arxiv +1 more source
Structures in the microwave background radiation [PDF]
, 2012 We compare the actual WMAP maps with artificial, purely statistical maps of the same harmonic content to argue that there are, with confidence level 99.7 %, ring-type structures in the observed cosmic microwave background.
arxiv +1 more source
On the (Higher Multipoles) Variance Asymmetry in the Cosmic Microwave Background
The Astrophysical JournalWe have studied the cosmic microwave background (CMB) map looking for features beyond cosmological isotropy. We began by tiling the CMB variance maps (which are produced by different smoothing scales) with stripes of different sizes along the most ...
MohammadHossein Jamshidi +2 more
doaj +1 more source
Fortschritte der Physik, Volume 73, Issue 3, March 2025.Abstract Current observations show that a significant fraction of the Universe is composed of dark energy and dark matter. In this paper, the simultaneous effects of these dark sectors on the Euler–Heisenberg black hole are investigated, using the quintessence matter field and perfect fluid to model them. In particular, the black hole's thermodynamics,
Bilel Hamil, Bekir Can Lütfüoğlu
wiley +1 more source
A Measurement of Atmospheric Circular Polarization with POLARBEAR
The Astrophysical JournalAt millimeter wavelengths, the atmospheric emission is circularly polarized owing to the Zeeman splitting of molecular oxygen by the Earth's magnetic field.
Takuro Fujino +22 more
doaj +1 more source