Search Publications
Constraints on cosmological birefringence from PLANCK and Bicep2/Keck data
Gruppuso, A.; Mandolesi, N.; Melchiorri, A. +4 more
The polarization of cosmic microwave background (CMB) can be used to constrain cosmological birefringence, the rotation of the linear polarization of CMB photons potentially induced by parity violating physics beyond the standard model. This effect produces non-null CMB cross correlations between temperature and B mode-polarization, and between E-…
Parameter splitting in dark energy: is dark energy the same in the background and in the cosmic structures?
Verde, Licia; Cuesta, Antonio J.; Bernal, José Luis
We perform an empirical consistency test of General Relativity/dark energy by disentangling expansion history and growth of structure constraints. We replace each late-universe parameter that describes the behavior of dark energy with two meta-parameters: one describing geometrical information in cosmological probes, and the other controlling the …
A comment on power-law inflation with a dark radiation component
Di Valentino, Eleonora; Bouchet, François R.
Tram et al. 2016 recently pointed out in [1] that power-law inflation in presence of a dark radiation component may relieve the 3.3 σ tension which exists within standard ΛCDM between the determination of the local value of the Hubble constant by Riess et al. (2016) [2] and the value derived from CMB anisotropy data [3] by the Planck collaboration…
Testing for new physics: neutrinos and the primordial power spectrum
Aslanyan, Grigor; Easther, Richard; Price, Layne C. +2 more
We test the sensitivity of neutrino parameter constraints from combinations of CMB and LSS data sets to the assumed form of the primordial power spectrum (PPS) using Bayesian model selection. Significantly, none of the tested combinations, including recent high-precision local measurements of H0 and cluster abundances, indicate a signal…
Updated galactic radio constraints on Dark Matter
Cirelli, Marco; Taoso, Marco
We perform a detailed analysis of the synchrotron signals produced by dark matter annihilations and decays. We consider different set-ups for the propagation of electrons and positrons, the galactic magnetic field and dark matter properties. We then confront these signals with radio and microwave maps, including Planck measurements, from a frequen…
Constraining quantum collapse inflationary models with CMB data
Benetti, Micol; Alcaniz, Jailson S.; Landau, Susana J.
The hypothesis of the self-induced collapse of the inflaton wave function was proposed as responsible for the emergence of inhomogeneity and anisotropy at all scales. This proposal was studied within an almost de Sitter space-time approximation for the background, which led to a perfect scale-invariant power spectrum, and also for a quasi-de Sitte…
Dipole modulation of cosmic microwave background temperature and polarization
Ghosh, Shamik; Kothari, Rahul; Jain, Pankaj +1 more
We propose a dipole modulation model for the Cosmic Microwave Background Radiation (CMBR) polarization field. We show that the model leads to correlations between l and l+1 multipoles, exactly as in the case of temperature. We obtain results for the case of TE, EE and BB correlations. An anisotropic or inhomogeneous model of primordial power spect…
Probing the statistical properties of CMB B-mode polarization through Minkowski functionals
Wang, Kai; Santos, Larissa; Zhao, Wen
The detection of the magnetic type B-mode polarization is the main goal of future cosmic microwave background (CMB) experiments. In the standard model, the B-mode map is a strong non-gaussian field due to the CMB lensing component. Besides the two-point correlation function, the other statistics are also very important to dig the information of th…
Testing distance duality with CMB anisotropies
Räsänen, Syksy; Väliviita, Jussi; Kosonen, Ville
We constrain deviations of the form T propto (1+z)1+epsilon from the standard redshift-temperature relation, corresponding to modifying distance duality as DL = (1+z)2(1+epsilon) DA. We consider a consistent model, in which both the background and perturbation equations are changed. For this purpose, we …
Dark matter implications of the WMAP-Planck Haze
Pierpaoli, Elena; Egorov, A. E.; Gaskins, Jennifer M. +1 more
Gamma rays and microwave observations of the Galactic Center and surrounding areas indicate the presence of anomalous emission, whose origin remains ambiguous. The possibility of dark matter annihilation explaining both signals through prompt emission at gamma rays and secondary emission at microwave frequencies from interactions of high-energy el…