Statistical nature of non-Gaussianity from cubic order primordial perturbations: CMB map simulations and genus statistic
نویسندگان
چکیده
منابع مشابه
CMB lensing extraction and primordial non-Gaussianity
The next generation of CMB experiments should get a better handle on cosmological parameters by mapping the weak lensing deflection field, which is separable from primary anisotropies thanks to the non-Gaussianity induced by lensing. However, the generation of perturbations in the Early Universe also produces a level of non-Gaussianity which is known to be small, but can contribute to the aniso...
متن کاملTesting Primordial Non-Gaussianity in CMB Anisotropies
Recent second-order perturbation computations have provided an accurate prediction for the primordial gravitational potential, Φ(x), in scenarios in which cosmological perturbations are generated either during or after inflation. This enables us to make realistic predictions for a nonGaussian part of Φ(x), which is generically written in momentum space as a double convolution of its Gaussian pa...
متن کاملThe Nature of Primordial Perturbations in Light of CMB Observations
The universe is filled with nearly isotropic cosmic microwave background (CMB) radiation, which has a blackbody spectrum of temperature T ≈ 2.73K. In addition, there are tiny direction dependent deviations δT from the mean temperature, δT/T . 10−4. These CMB anisotropies result from small primordial perturbations. The initial conditions, deep in the radiation-dominated universe, can be a mixtur...
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The assumption of Gaussianity of the primordial perturbations plays an important role in modern cosmology. The most direct test of this hypothesis consists in testing Gaussianity of the CMB maps. Counting the pixels with the temperatures in given ranges and thus estimating the one point probability function of the field is the simplest of all the tests. Other usually more complex tests of Gauss...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2009
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2009/12/019