Search Publications
Evidence for interacting dark energy from BOSS
Ferreira, Elisa G. M.; Quintin, Jerome; Costa, André A. +2 more
The result presented by the BOSS-SDSS Collaboration measuring the baryon acoustic oscillations of the Lyman-alpha forest from high-redshift quasars indicates a 2.5 σ departure from the standard Λ -cold-dark-matter model. This is the first time that the evolution of dark energy at high redshifts has been measured, and the current results cannot be …
Planck constraint on relic primordial black holes
Gao, Yu; Dutta, Bhaskar; Strigari, Louis E. +2 more
We investigate constraints on the abundance of primordial black holes (PBHs) in the mass range 1015- 1017 g using data from the cosmic microwave background (CMB) and MeV extragalactic gamma-ray background (EGB). Hawking radiation from PBHs with lifetime greater than the age of the Universe leaves an imprint on the CMB through…
Propagation of cosmic rays in the AMS-02 era
Fang, Kun; Yuan, Qiang; Lin, Su-Jie +1 more
In this work we use the newly reported boron-to-carbon ratio (B/C) from AMS-02 and the time-dependent proton fluxes from PAMELA and AMS-02 to constrain the source and propagation parameters of cosmic rays in the Milky Way. A linear correlation of the solar modulation parameter with solar activities is assumed to account for the time-varying cosmic…
Warm inflation dissipative effects: Predictions and constraints from the Planck data
Benetti, Micol; Ramos, Rudnei O.
We explore the warm inflation scenario theoretical predictions looking at two different dissipative regimes for several representative primordial potentials. As it is well known, warm inflation is able to decrease the tensor-to-scalar ratio value, rehabilitating several primordial potentials ruled out in the cold inflation context by the recent co…
Maximum a posteriori CMB lensing reconstruction
Carron, Julien; Lewis, Antony
Gravitational lensing of the cosmic microwave background (CMB) is a valuable cosmological signal that correlates to tracers of large-scale structure and acts as a important source of confusion for primordial B -mode polarization. State-of-the-art lensing reconstruction analyses use quadratic estimators, which are easily applicable to data. However…
Search for sterile neutrinos in holographic dark energy cosmology: Reconciling Planck observation with the local measurement of the Hubble constant
Zhang, Jing-Fei; Zhang, Xin; He, Dong-Ze +1 more
We search for sterile neutrinos in the holographic dark energy cosmology by using the latest observational data. To perform the analysis, we employ the current cosmological observations, including the cosmic microwave background temperature power spectrum data from the Planck mission, the baryon acoustic oscillation measurements, the type Ia super…
Cosmological discordances. II. Hubble constant, Planck and large-scale-structure data sets
Ishak, Mustapha; Lin, Weikang
We examine systematically the (in)consistency between cosmological constraints as obtained from various current data sets of the expansion history, large-scale-structure (LSS), and cosmic microwave background (CMB) temperature and polarization from Planck. We run (dis)concordance tests within each set and across the three sets using a recently int…
Pre-inflationary universe in loop quantum cosmology
Zhu, Tao; Wang, Anzhong; Cleaver, Gerald +2 more
The evolutions of the flat Friedmann-Lemaître-Robertson-Walker universe and its linear perturbations are studied systematically in the dressed metric approach of loop quantum cosmology. When it is dominated by the kinetic energy of the inflaton at the quantum bounce, the evolution of the background can be divided into three different phases prior …
Impact of neutrino properties on the estimation of inflationary parameters from current and future observations
Ho, Shirley; Mena, Olga; Gerbino, Martina +4 more
We study the impact of assumptions about neutrino properties on the estimation of inflationary parameters from cosmological data, with a specific focus on the allowed contours in the ns/r plane, where ns is the scalar spectral index and r is the tensor-to-scalar ratio. We study the following neutrino properties: (i) the total…
Axion-like particles and recent observations of the cosmic infrared background radiation
Kohri, Kazunori; Kodama, Hideo
The CIBER collaboration released their first observational data of the Cosmic IR background (CIB) radiation, which has significant excesses at around the wavelength ∼1 µ m compared to theoretically-inferred values. The amount of the CIB radiation has a significant influence on the opaqueness of the Universe for TeV gamma-rays emitted from di…