Search Publications
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…
Breaking Be: a sterile neutrino solution to the cosmological lithium problem
Lattanzi, M.; Melchiorri, A.; Pagano, L. +2 more
The possibility that the so-called ``lithium problem'', i.e., the disagreement between the theoretical abundance predicted for primordial 7Li assuming standard nucleosynthesis and the value inferred from astrophysical measurements, can be solved through a non-thermal Big Bang Nucleosynthesis (BBN) mechanism has been investigated by seve…
Red, Straight, no bends: primordial power spectrum reconstruction from CMB and large-scale structure
Verde, Licia; Cuesta, Antonio J.; Ravenni, Andrea
We present a minimally parametric, model independent reconstruction of the shape of the primordial power spectrum. Our smoothing spline technique is well-suited to search for smooth features such as deviations from scale invariance, and deviations from a power law such as running of the spectral index or small-scale power suppression. We use a com…
DBI Galileon inflation in the light of Planck 2015
Sravan Kumar, K.; Bueno Sánchez, Juan C.; Escamilla-Rivera, Celia +2 more
In this work we consider a DBI Galileon (DBIG) inflationary model and constrain its parameter space with the Planck 2015 and BICEP2/Keck array and Planck (BKP) joint analysis data by means of a potential independent analysis. We focus our attention on inflationary solutions characterized by a constant or varying sound speed as well as warp factor.…
Realization of power law inflation & variants via variation of the strong coupling constant
AlHallak, M.; Chamoun, N.
We present a model of power law inflation generated by variation of the strong coupling constant. We then extend the model to two varying coupling constants which leads to a potential consisting of a linear combination of exponential terms. Some variants of the latter may be self-consistent and can accommodate the experimental data of the Planck 2…