نتایج جستجو برای: cmb model
تعداد نتایج: 2108334 فیلتر نتایج به سال:
The Correlated Component Analysis (CCA) allows us to estimate how the different diffuse emissions mix in CMB experiments, taking also into account complementary information from other surveys. It is especially useful to deal with possible additional components for which little or no prior information exists. An application of CCA to WMAP maps assuming that only the canonical Galactic emissions ...
The Earth's core is mostly an Fe-Ni alloy with a fraction of light elements (~10 wt%, mainly O, S and Si). Accumulation of these light elements under the core-mantle boundary (CMB) may lead to chemical stratification. Seismic observations have been presented both for and against the stratification in the topmost region of the outer core. Here we investigate the structure under the CMB using dif...
The intervening large–scale structure distorts cosmic microwave background (CMB) anisotropies via gravitational lensing. The same large–scale structure, traced by dusty star–forming galaxies, also induces anisotropies in the far–infrared background (FIRB). We investigate the resulting inter–dependence of the FIRB and CMB with a halo model for the FIRB. In particular, we calculate the cross–corr...
Observations of the temperature anisotropies induced as light from the CMB passes through large scale structures in the late universe are a sensitive probe of the interactions of photons in such environments. In extensions of the Standard Model which give rise to mini-charged particles, photons propagating through transverse magnetic fields can be lost to pair production of such particles. Such...
We study gravitational lensing statistics, matter power spectra and the angular power spectra of the cosmic microwave background (CMB) radiation in x-matter models. We adopt an equation-of-state of x-matter which can express a wide range of matter from the pressureless dust to the cosmological constant. A new ingredient in this model is the sound speed of the x-component in addition to the equa...
The statistics of isothermal lines and loops of the cosmic microwave background (CMB) radiation on the sky map is studied and the fractal structure is confirmed in the radiation temperature fluctuation. We estimate the fractal exponents, such as the fractal dimension De of the entire pattern of isothermal lines, the fractal dimension Dc of a single isothermal line, the exponent in Korčak’s law ...
For the first time, measurements of the cosmic microwave background radiation (CMB) alone favor cosmologies with w = -1 dark energy over models without dark energy at a 3.2-sigma level. We demonstrate this by combining the CMB lensing deflection power spectrum from the Atacama Cosmology Telescope with temperature and polarization power spectra from the Wilkinson Microwave Anisotropy Probe. The ...
Gravitational lensing of the cosmic microwave background by large-scale structure in the late universe is both a source of cosmological information and a potential contaminant of primordial gravity waves. Because lensing imprints growth of structure in the late universe on the CMB, measurements of CMB lensing will constrain parameters to which the CMB would not otherwise be sensitive, such as n...
We use a combination of the most recent cosmic microwave background (CMB) flat-band power measurements to place constraints on Hubble’s constant h and the total density of the Universe Ωo in the context of inflation-based CDM models with no cosmological constant. We use χ minimization to explore the 5-dimensional parameter space having as free parameters, h, Ωo, the power spectrum slope n, the ...
We predict the imprint of linear bubbly perturbations on the polarization and temperature anisotropies of the cosmic microwave background (CMB). We analytically model a bubbly density perturbation at the beginning of the radiation dominated era and we apply the linear theory of cosmological perturbations to compute its time evolution. At decoupling, it uniquely signs the CMB polarization and te...
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