Search Publications
Reheating predictions in single field inflation
Krauss, Lawrence M.; Easson, Damien A.; Cook, Jessica L. +1 more
Reheating is a transition era after the end of inflation, during which the inflaton is converted into the particles that populate the Universe at later times. No direct cosmological observables are normally traceable to this period of reheating. Indirect bounds can however be derived. One possibility is to consider cosmological evolution for obser…
Constraint on neutrino masses from SDSS-III/BOSS Lyα forest and other cosmological probes
Ross, Nicholas P.; Borde, Arnaud; Palanque-Delabrouille, Nathalie +11 more
We present constraints on the parameters of the ΛCDM cosmological model in the presence of massive neutrinos, using the one-dimensional Lyα forest power spectrum obtained with the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey (SDSS) by Palanque-Delabrouille et al. [1], complemented by additional cosmological probes…
Decaying dark matter and the tension in σ8
Takahashi, Tomo; Sekiguchi, Toyokazu; Nadathur, Seshadri +1 more
We consider decaying dark matter (DDM) as a resolution to the possible tension between cosmic microwave background (CMB) and weak lensing (WL) based determinations of the amplitude of matter fluctuations, σ8. We perform N-body simulations in a model where dark matter decays into dark radiation and develop an accurate fitting formula for…
Where do the 3.5 keV photons come from? A morphological study of the Galactic Center and of Perseus
Profumo, Stefano; Jeltema, Tesla; Carlson, Eric
We test the origin of the 3.5 keV line photons by analyzing the morphology of the emission at that energy from the Galactic Center and from the Perseus cluster of galaxies. We employ a variety of different templates to model the continuum emission and analyze the resulting radial and azimuthal distribution of the residual emission. We then perform…
A possible explanation of low energy γ-ray excess from galactic centre and Fermi bubble by a Dark Matter model with two real scalars
Prasad Modak, Kamakshya; Majumdar, Debasish; Rakshit, Subhendu
We promote the idea of multi-component Dark Matter (DM) to explain results from both direct and indirect detection experiments. In these models as contribution of each DM candidate to relic abundance is summed up to meet WMAP/Planck measurements of ΩDM, these candidates have larger annihilation cross-sections compared to the single-comp…
Revisiting cosmological bounds on sterile neutrinos
Mena, Olga; Vincent, Aaron C.; Lattanzi, Massimiliano +2 more
We employ state-of-the art cosmological observables including supernova surveys and BAO information to provide constraints on the mass and mixing angle of a non-resonantly produced sterile neutrino species, showing that cosmology can effectively rule out sterile neutrinos which decay between BBN and the present day. The decoupling of an additional…
Super Heavy Dark Matter in light of BICEP2, Planck and Ultra High Energy Cosmic Rays Observations
Matarrese, S.; Aloisio, R.; Olinto, A. V.
The announcement by BICEP2 of the detection of B-mode polarization consistent with primordial gravitational waves with a tensor-to-scalar ratio, r=0.2+0.07-0.05, challenged predictions from most inflationary models of a lower value for r. More recent results by Planck on polarized dust emission show that the observed tensor m…
Detecting primordial B-modes after Planck
Zaldarriaga, Matias; Creminelli, Paolo; López Nacir, Diana +2 more
We update the forecasts for the measurement of the tensor-to-scalar ratio r for various ground-based experiments (AdvACT, CLASS, Keck/BICEP3, Simons Array, SPT-3G), balloons (EBEX 10k and Spider) and satellites (CMBPol, COrE and LiteBIRD), taking into account the recent Planck data on polarized dust and using a component separation method. The for…
CMB and BAO constraints for an induced gravity dark energy model with a quartic potential
Finelli, F.; Paoletti, D.; Ballardini, M. +1 more
We study the predictions for structure formation in an induced gravity dark energy model with a quartic potential. By developing a dedicated Einstein-Boltzmann code, we study self-consistently the dynamics of homogeneous cosmology and of linear perturbations without using any parametrization. By evolving linear perturbations with initial condition…
Constraints on secret neutrino interactions after Planck
Lattanzi, Massimiliano; Natoli, Paolo; Forastieri, Francesco
Neutrino interactions beyond the standard model of particle physics may affect the cosmological evolution and can be constrained through observations. We consider the possibility that neutrinos possess secret scalar or pseudoscalar interactions mediated by the Nambu-Goldstone boson of a still unknown spontaneously broken global U(1) symmetry, as i…