14.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of PaduaIT5.1k papers
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- Massachusetts Institute of TechnologyUS2.5k papers
27 papers · 2 filters
The Spectral Energy Distribution of Fermi bright blazars
A. A. Abdo, M. Ackermann, M. Ajello +107
(Abridged) We have conducted a detailed investigation of the broad-band spectral properties of the γ-ray selected blazars of the Fermi LAT Bright AGN Sample (LBAS). By combining ou…
Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on its redshift
The VERITAS Collaboration, V. A. Acciari, The Fermi Collaboration +4
We report the first detection of very-high-energy (VHE) gamma-ray emission above 140 GeV from PKS 1424+240, a BL Lac object with an unknown redshift. The photon spectrum above 140…
Thermal Relics in Modified Cosmologies: Bounds on Evolution Histories of the Early Universe and Cosmological Boosts for PAMELA
R. Catena, N. Fornengo, M. Pato +2
Alternative cosmologies, based on extensions of General Relativity, predict modified thermal histories in the Early Universe during the pre Big Bang Nucleosynthesis (BBN) era, epoc…
Signatures of Primordial non-Gaussianities in the Matter Power-Spectrum and Bispectrum: the Time-RG Approach
Nicola Bartolo, J. P. Beltran Almeida, Sabino Matarrese +2
We apply the time-renormalization group approach to study the effect of primordial non-Gaussianities in the non-linear evolution of cosmological dark matter density perturbations.…
Non-linear Matter Spectra in Coupled Quintessence
F. Saracco, M. Pietroni, N. Tetradis +2
We consider cosmologies in which a dark-energy scalar field interacts with cold dark matter. The growth of perturbations is followed beyond the linear level by means of the time-re…
Unified Dark Matter models with fast transition
Oliver F. Piattella, Daniele Bertacca, Marco Bruni +1
We investigate the general properties of Unified Dark Matter (UDM) fluid models where the pressure and the energy density are linked by a barotropic equation of state (EoS) $p = p(…
An Upper Limit on the Stochastic Gravitational-Wave Background of Cosmological Origin
The LIGO Scientific Collaboration, the Virgo Collaboration
A stochastic background of gravitational waves is expected to arise from a superposition of a large number of unresolved gravitational-wave sources of astrophysical and cosmologica…
The Halo Mass Function from Excursion Set Theory with a Non-Gaussian Trispectrum
Michele Maggiore, Antonio Riotto
A sizeable level of non-Gaussianity in the primordial cosmological perturbations may be induced by a large trispectrum, i.e. by a large connected four-point correlation function. W…
Imprints of primordial non-Gaussianities in X-ray and SZ signals from galaxy clusters
M. Roncarelli, L. Moscardini, E. Branchini +4
Several inflationary models predict the possibility that the primordial perturbations of the density field may contain a degree of non-Gaussianity which would influence the subsequ…
Anisotropic Trispectrum of Curvature Perturbations Induced by Primordial Non-Abelian Vector Fields
Nicola Bartolo, Emanuela Dimastrogiovanni, Sabino Matarrese +1
Motivated by the interest in models of the early universe where statistical isotropy is broken and can be revealed in cosmological observations, we consider an SU(2) theory of gaug…
Detectability of the effect of Inflationary non-Gaussianity on halo bias
Licia Verde, Sabino Matarrese
We consider the description of the clustering of halos for physically-motivated types of non-Gaussian initial conditions. In particular we include non-Gaussianity of the type arisi…
The High Redshift Integrated Sachs-Wolfe Effect
Jun-Qing Xia, Matteo Viel, Carlo Baccigalupi +1
In this paper we rely on the quasar (QSO) catalog of the Sloan Digital Sky Survey Data Release Six (SDSS DR6) of about one million photometrically selected QSOs to compute the Inte…
Discovery of Very High Energy gamma-rays from the blazar S5 0716+714
H. Anderhub
The MAGIC collaboration reports the detection of the blazar S5 0716+714 z=0.31+-0.08 in very high energy gamma-rays. The observations were performed in November 2007 and in April 2…
Anisotropic bispectrum of curvature perturbations from primordial non-Abelian vector fields
Nicola Bartolo, Emanuela Dimastrogiovanni, Sabino Matarrese +1
We consider a primordial SU(2) vector multiplet during inflation in models where quantum fluctuations of vector fields are involved in producing the curvature perturbation. Recentl…
Directional Variations of the Non-Gaussianity Parameter f_NL
Øystein Rudjord, Frode K. Hansen, Xiaohong Lan +3
We investigate local variations of the primordial non-Gaussianity parameter f_NL in the WMAP data, looking for possible influence of foreground contamination in the full-sky estima…
Suzaku and Multi-wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
Hiromi Seta, Naoki Isobe, Makoto S. Tashiro +10
Suzaku observations of the blazar OJ 287 were performed in 2007 April 10--13 and November 7--9. They correspond to a quiescent and a flaring state, respectively. The X-ray spectra…
The clustering of galaxy clusters in cosmological models with non-Gaussian initial conditions: Predictions for future surveys
C. Fedeli, L. Moscardini, S. Matarrese
We predict the biasing and clustering properties of galaxy clusters that are expected to be observed in the catalogues produced by two forthcoming X-ray and Sunyaev-Zel'dovich effe…
Large-scale non-Gaussian mass function and halo bias: tests on N-body simulations
M. Grossi, L. Verde, C. Carbone +5
The description of the abundance and clustering of halos for non-Gaussian initial conditions has recently received renewed interest, motivated by the forthcoming large galaxy and c…
The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
Chiara Caprini, Fabio Finelli, Daniela Paoletti +1
We evaluate the angular bispectrum of the CMB temperature anisotropy at large angular scale due to a stochastic background of primordial magnetic fields. The shape of non-Gaussiani…
The Halo Mass Function from Excursion Set Theory. III. Non-Gaussian Fluctuations
Michele Maggiore, Antonio Riotto
We compute the effect of primordial non-Gaussianity on the halo mass function, using excursion set theory. In the presence of non-Gaussianity the stochastic evolution of the smooth…
The Halo Mass Function from Excursion Set Theory. II. The Diffusing Barrier
Michele Maggiore, Antonio Riotto
In excursion set theory the computation of the halo mass function is mapped into a first-passage time process in the presence of a barrier, which in the spherical collapse model is…
CMB anisotropies at second order III: bispectrum from products of the first-order perturbations
Daisuke Nitta, Eiichiro Komatsu, Nicola Bartolo +2
We calculate the bispectrum of the Cosmic Microwave Background (CMB) temperature anisotropies induced by the second-order fluctuations in the Boltzmann equation. In this paper, whi…
Weak lensing signal in Unified Dark Matter models
Stefano Camera, Daniele Bertacca, Antonaldo Diaferio +2
Weak gravitational lensing is a powerful tool for studying both the geometry and the dynamics of the Universe. Its power spectrum contains information on the sources emitting photo…
Non-linear Power Spectrum including Massive Neutrinos: the Time-RG Flow Approach
J. Lesgourgues, S. Matarrese, M. Pietroni +1
Future large scale structure observations are expected to be sensitive to small neutrino masses, of the order of 0.05 eV or more. However, forecasts are based on the assumption tha…