Search Publications
Structure formation in f(T) gravity and a solution for H0 tension
Nunes, Rafael C.
We investigate the evolution of scalar perturbations in f(T) teleparallel gravity and its effects on the cosmic microwave background (CMB) anisotropy. The f(T) gravity generalizes the teleparallel gravity which is formulated on the Weitzenböck spacetime, characterized by the vanishing curvature tensor (absolute parallelism) and the non-vanishing t…
Neutrino masses and their ordering: global data, priors and models
de Salas, P. F.; Gariazzo, S.; Archidiacono, M. +3 more
We present a full Bayesian analysis of the combination of current neutrino oscillation, neutrinoless double beta decay and Cosmic Microwave Background observations. Our major goal is to carefully investigate the possibility to single out one neutrino mass ordering, namely Normal Ordering or Inverted Ordering, with current data. Two possible parame…
Exploring cosmic origins with CORE: B-mode component separation
Boulanger, F.; Ashdown, M.; Baccigalupi, C. +114 more
We demonstrate that, for the baseline design of the CORE satellite mission, the polarized foregrounds can be controlled at the level required to allow the detection of the primordial cosmic microwave background (CMB) B-mode polarization with the desired accuracy at both reionization and recombination scales, for tensor-to-scalar ratio values of rg…
Relieving the tension between weak lensing and cosmic microwave background with interacting dark matter and dark energy models
Feng, Chang; Wang, Bin; An, Rui
We constrain interacting dark matter and dark energy (IDMDE) models using a 450-degree-square cosmic shear data from the Kilo Degree Survey (KiDS) and the angular power spectra from Planck's latest cosmic microwave background measurements. We revisit the discordance problem in the standard Lambda cold dark matter (ΛCDM) model between weak lensing …
Constraining warm inflation with CMB data
Bhattacharya, Sukannya; Dutta, Koushik; Gangopadhyay, Mayukh Raj +1 more
We confront the warm inflation observational predictions directly with the latest CMB data. We focus on a linear temperature (T) dissipative coefficient combined with the simplest model of inflation, a quartic chaotic potential. Although excluded in its standard cold inflation version, dissipation reduces the tensor-to-scalar ratio and brings the …
Deconstructing the neutrino mass constraint from galaxy redshift surveys
Komatsu, Eiichiro; Boyle, Aoife
The total mass of neutrinos can be constrained in a number of ways using galaxy redshift surveys. Massive neutrinos modify the expansion rate of the Universe, which can be measured using baryon acoustic oscillations (BAOs) or the Alcock-Paczynski (AP) test. Massive neutrinos also change the structure growth rate and the amplitude of the matter pow…
Exploring cosmic origins with CORE: Gravitational lensing of the CMB
Boulanger, F.; Ashdown, M.; Banday, A. J. +111 more
Lensing of the cosmic microwave background (CMB) is now a well-developed probe of the clustering of the large-scale mass distribution over a broad range of redshifts. By exploiting the non-Gaussian imprints of lensing in the polarization of the CMB, the CORE mission will allow production of a clean map of the lensing deflections over nearly the fu…
Revisiting CMB constraints on warm inflation
Arya, Richa; Dasgupta, Arnab; Goswami, Gaurav +2 more
We revisit the constraints that Planck 2015 temperature, polarization and lensing data impose on the parameters of warm inflation. To this end, we study warm inflation driven by a single scalar field with a quartic self interaction potential in the weak dissipative regime. We analyse the effect of the parameters of warm inflation, namely, the infl…
Probing features in inflaton potential and reionization history with future CMB space observations
Ballardini, Mario; Finelli, Fabio; Paoletti, Daniela +4 more
We consider the prospects of probing features in the primordial power spectrum with future Cosmic Microwave Background (CMB) polarization measurements. In the scope of the inflationary scenario, such features in the spectrum can be produced by local non-smooth pieces in an inflaton potential (smooth and quasi-flat in general) which in turn may ori…
Exploring cosmic origins with CORE: Extragalactic sources in cosmic microwave background maps
Boulanger, F.; Ashdown, M.; Banday, A. J. +124 more
We discuss the potential of a next generation space-borne Cosmic Microwave Background (CMB) experiment for studies of extragalactic sources. Our analysis has particular bearing on the definition of the future space project, CORE, that has been submitted in response to ESA's call for a Medium-size mission opportunity as the successor of the Planck …