Search Publications

Model-independent analyses of non-Gaussianity in Planck CMB maps using Minkowski functionals

Buchert, Thomas; France, Martin J.; Steiner, Frank

Despite the wealth of Planck results, there are difficulties in disentangling the primordial non-Gaussianity of the Cosmic Microwave Background (CMB) from the secondary and the foreground non-Gaussianity (NG). For each of these forms of NG the lack of complete data introduces model-dependences. Aiming at detecting the NGs of the CMB temperature an…

On the running of the spectral index to all orders: a new model-dependent approach to constrain inflationary models

Zarei, Moslem

In conventional model-independent approaches, the power spectrum of primordial perturbations is characterized by such free parameters as the spectral index, its running, the running of running, and the tensor-to-scalar ratio. In this work we show that, at least for simple inflationary potentials, one can find the primordial scalar and tensor power…

Composite Inflation in the light of 2015 Planck data

Channuie, Phongpichit

In this work, we examine cosmological constraints on models of composite inflation based on the slow-roll approximation by using the recent Planck measurement. We compare the spectral index of curvature perturbation (and its running) and the tensor-to-scalar ratio predicted by such models with Planck 2015 data. We find that the predictions of tech…

The tension on the cosmological parameters from different observational data

Gao, Qing; Gong, Yungui

Planck measurements of the cosmic microwave background power spectra find a lower value of the Hubble constant H₀ and a higher value of the fractional matter energy density Ω_m0 for the concordance ΛCDM model, and these results are in tension with other measurements. The Planck group argued that the tension came either from so…