Results 71 to 80 of about 132,304 (298)
Primordial circular polarization in the cosmic microwave background
Physics Letters B, 2019 Circular (“V-mode”) polarization is expected to be vanishing in the CMB, since it is not produced in Thomson scattering. However, considering that the conventional CMB anisotropies are generated via an early universe mechanism such as inflation or a ...
Stephon Alexander, Evan McDonough
doaj +1 more source
Cosmic Microwave Background Anisotropy Observing Strategy Assessment [PDF]
, 1996 I develop a method for assessing the ability of an instrument, coupled with an observing strategy, to measure the angular power spectrum of the cosmic microwave background (CMB).
Lloyd Knox, Tegmark M.
core +2 more sources
Improved constraints on lepton asymmetry from the cosmic microwave background [PDF]
, 2017 A cosmic lepton asymmetry affects the primordial helium abundance and the expansion rate of the early Universe. Both of these effects have an impact on the anisotropies of the cosmic microwave background (CMB).
Isabel M. Oldengott, D. Schwarz
semanticscholar +1 more source
Logarithmic and Strong Coupling Models in Weyl‐Type f(Q,T)$f(Q,T)$ Gravity
Annalen der Physik, Volume 538, Issue 1, January 2026.This work explores Weyl‐type f(Q,T) gravity using recent observational datasets — CC, Pantheon+, Union 3.0, and DESI DR2. Through MCMC analysis of logarithmic and strong coupling models, the study reveals a transition from deceleration to acceleration, quintessence‐to‐phantom dynamics, and late‐time consistency with LCDM, offering a geometry‐driven ...
Rahul Bhagat, S. K. Tripathy, B. Mishra
wiley +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
Adapted Method for Separating Kinetic SZ Signal from Primary CMB Fluctuations
EURASIP Journal on Advances in Signal Processing, 2005 In this first attempt to extract a map of the kinetic Sunyaev-Zel'dovich (KSZ) temperature fluctuations from the cosmic microwave background (CMB) anisotropies, we use a method which is based on simple and minimal assumptions.
Forni Olivier, Aghanim Nabila
doaj +1 more source
Dark Energy with Phantom Crossing and the H0 Tension
Entropy, 2021 We investigate the possibility of phantom crossing in the dark energy sector and the solution for the Hubble tension between early and late universe observations.
Eleonora Di Valentino +2 more
doaj +1 more source
The Cosmic Microwave Background Bispectrum and Inflation [PDF]
, 1999 We derive an expression for the non-Gaussian cosmic-microwave-background (CMB) statistic $I_l^3$ defined recently by Ferreira, Magueijo, and G\'orski in terms of the slow-roll-inflation parameters $\epsilon$ and $\eta$.
A. A. Starobinsky +23 more
core +2 more sources
Cosmic Microwave Background Anisotropies [PDF]
Annual Review of Astronomy and Astrophysics, 2002 ▪ Abstract Cosmic microwave background (CMB) temperature anisotropies have and will continue to revolutionize our understanding of cosmology. The recent discovery of the previously predicted acoustic peaks in the power spectrum has established a working cosmological model: a critical density universe consisting of mainly dark matter and dark energy ...
Hu, Wayne, Dodelson, Scott
openaire +2 more sources
Full-sky Gravitational Lensing Simulation for Large-area Galaxy Surveys and Cosmic Microwave Background Experiments [PDF]
, 2017 We present 108 full-sky gravitational lensing simulation data sets generated by performing multiple-lens plane ray-tracing through high-resolution cosmological N-body simulations. The data sets include full-sky convergence and shear maps from redshifts z
R. Takahashi +6 more
semanticscholar +1 more source