搜索结果: 1-15 共查到“天体物理学 CMB”相关记录18条 . 查询时间(0.075 秒)
Future constraints on variations of the fine structure constant from combined CMB and weak lensing measurements
Future constraints variations fine structure constant combined CMB weak lensing measurements
2012/2/21
We forecast the ability of future CMB and galaxy lensing surveys to constrain variations of the fine structure constant. We found that lensing data, as those expected from satellite experiments as Euc...
CMB radiation in an inhomogeneous spherical space
CMB radiation in an inhomogeneous spherical space
2011/10/20
We analyse the CMB radiation in spherical 3-spaces with non-trivial topology. The focus is put on an inhomogeneous space which possesses observer dependent CMB properties. The suppression of the CMB a...
Current cosmic microwave background (CMB) bounds on the sum of the neutrino masses assume a sudden reionization scenario described by a single parameter that determines the onset of reionization. We i...
Future CMB Constraints on Early, Cold, or Stressed Dark Energy
Future CMB Constraints on Early Cold Stressed Dark Energy
2011/1/11
We investigate future constraints on early dark energy (EDE) achievable by the Planck and CMBPol experiments, including cosmic microwave background (CMB) lensing. For the dark energy, we include the p...
The statistics of the curvature quanta generated during a stage of inflationary expansion is used to derive a count response model for the large-scale phonons determining, in the concordance lore, the...
Large-angle correlation anomalies and odd-parity preference in CMB data
cosmic background radiation early universe methods: data analysis meth-ods: statistical
2010/11/9
Angular power spectrum of CMB anisotropy and two point angular point correlation possess some
equivalence. Noting this, we have investigated the association between the WMAP large-angle corre-lation ...
CMB statistics in noncommutative inflation
Cosmological inflation Statistical anisotropy of the cosmic microwave background Scale-dependent non-Gaussianity
2010/11/12
Noncommutative geometry can provide effective description of physics at very short distances taking into account generic effects of quantum gravity. Inflation amplifies tiny quantum fluctuations in th...
The new generation CMB B-mode polarization experiment: POLARBEAR
new generation CMB B-mode polarization experiment
2010/11/10
We describe the Cosmic Microwave Background (CMB) polarization experiment called Po-larbear. This experiment will use the dedicated Huan Tran Telescope equipped with a powerful 1,200-bolometer array r...
Local Discontinuity Detection in the 7-Year WMAP CMB by Finite Differencing
Local Discontinuity Detection WMAP CMB
2010/11/12
An unexpected distribution of temperatures in the CosmicMicrowave Background (CMB) could be
a sign of new physics. In particular, the existence of cosmic defects could be indicated by temperature dis...
CMB two- and three-point correlation functions from Alfvén waves
CMB two- and three-point correlation functions Alfvén waves
2011/1/10
We study the cosmic microwave background (CMB) temperature fluctuations non-gaussianity due to the vector mode perturbations (Alfv\'en waves) supported by a stochastic cosmological magnetic field. We ...
Measurement of the cosmic microwave background (CMB) bispectrum, or three-point correlation function, has now become one of the principle efforts in early-Universe cosmology. Here we show that there i...
How to make clean separation of CMB E and B mode from incomplete sky data
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/29
We have investigated CMB E/B decomposition of incomplete sky data. Noting E and B mode decomposition operators in real space involve differentials of CMB polarization, we point out we may make clean E...
Impact of Instrumental Systematics on the CMB Bispectrum
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/28
We study the effects of instrumental systematics on the estimation of primordial non-Gaussianity using the cosmic microwave background (CMB) bispectrum from both the temperature and the polarization a...
Large Scale Traces of Solar System Cold Dust on CMB Anisotropies
Cosmology and Extragalactic Astrophysics (astro-ph.CO) Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/24
We explore the microwave anisotropies at large angular scales produced by the emission from cold and large dust grains, expected to exist in the outer parts of the Solar System, using a simple toy mod...
Delensing CMB Polarization with External Datasets
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/22
One of the primary scientific targets of current and future CMB polarization experiments is the search for a stochastic background of gravity waves in the early universe. As instrumental sensitivity i...