Results for "C. Baccigalupi"

total 123186took 0.30s
Sub-horizon Perturbation Behavior in Extended QuintessenceMay 15 2002In the general context of scalar-tensor theories, we consider a model in which a scalar field coupled to the Ricci scalar in the gravitational sector of the Lagrangian, is also playing the role of an ``Extended Quintessence'' field, dominating the energy ... More
Constraining the dark energy dynamics with the cosmic microwave background bispectrumAug 07 2003Sep 30 2003We consider the influence of the dark energy dynamics at the onset of cosmic acceleration on the Cosmic Microwave Background (CMB) bispectrum, through the weak lensing effect induced by structure formation. We study the line of sight behavior of the contribution ... More
The S-PASS view of polarized Galactic Synchrotron at 2.3 GHz as a contaminant to CMB observationsFeb 04 2018Sep 13 2018We analyze the Southern Sky emission in linear polarization at 2.3 GHz as observed by the S-band Polarization All Sky Survey S-PASS. Our purpose is to study the properties of the diffuse Galactic polarized synchrotron as a contaminant to CMB B-mode observations. ... More
Imprints of Primordial Voids on the CMBNov 05 1996We generalize in several ways the results existing in the literature: a) we make use of an exact general relativistic solution for a spherical, nearly empty cavity in the matter dominated era to evaluate the null geodesics and the Sachs-Wolfe effect; ... More
Impact of foregrounds on Cosmic Microwave Background mapsJan 12 2004We discuss the possible impact of astrophysical foregrounds on three recent exciting results of Cosmic Microwave Background (CMB) experiments: the WMAP measurements of the temperature-polarization (TE) correlation power spectrum, the detection of CMB ... More
Probing dark energy with the CMB: projected constraints from WMAP and PlanckJan 11 2003Jun 18 2003We investigate the accuracy attainable by forthcoming space-based observations of the cosmic microwave background (CMB) temperature and polarization anisotropy in constraining the dark energy density parameter $\Oq$ and equation of state $\wq=p_{\rm Q}/\rho_{\rm ... More
Implications for quintessence models from MAXIMA-1 and BOOMERANG-98Sep 27 2000Nov 23 2000Prompted by the recent MAXIMA-1 and BOOMERANG-98 measurements of the cosmic microwave background (CMB) anisotropy power spectrum, and motivated by the results from the observation of high-redshift Type Ia supernovae, we investigate CMB anisotropies in ... More
Characterization of foreground emission at degree angular scale for CMB B-modes observations. Thermal Dust and Synchrotron signal from Planck and WMAP dataNov 02 2015We quantify the contamination from polarized diffuse Galactic synchrotron and thermal dust emissions to the B-modes of the CMB anisotropies on the degree angular scale, using data from the Planck and WMAP satellites. We compute power spectra of foreground ... More
Reionization History from Coupled CMB/21cm Line DataFeb 21 2005We study CMB secondary anisotropies produced by inhomogeneous reionization by means of cosmological simulations coupled with the radiative transfer code CRASH. The reionization history is consistent with the WMAP Thomson optical depth determination. We ... More
Observing patchy reionization with future CMB polarization experimentsJan 08 2018We study the signal from patchy reionization in view of the future high accuracy polarization measurements of the Cosmic Microwave Background (CMB). We implement an extraction procedure of the patchy reionization signal analogous to CMB lensing. We evaluate ... More
Scalar field dark energy and Cosmic Microwave BackgroundMay 15 2002A dynamical scalar field represents the simplest generalization of a pure Cosmological Constant as a candidate to explain the recent evidence in favour of the accelerated cosmic expansion. We review the dynamical properties of such a component, and argue ... More
What's Behind Acoustic Peaks in the Cosmic Microwave Background AnisotropiesDec 06 2001We give a brief review of the physics of acoustic oscillations in Cosmic Microwave Background (CMB) anisotropies. As an example of the impact of their detection in cosmology, we show how the present data on CMB angular power spectrum on sub-degree scales ... More
Maximum Likelihood algorithm for parametric component separation in CMB experimentsApr 16 2008Jan 21 2009We discuss an approach to the component separation of microwave, multi-frequency sky maps as those typically produced from Cosmic Microwave Background (CMB) Anisotropy data sets. The algorithm is based on the two step, parametric, likelihood-based technique ... More
Trade-off between angular resolution and straylight contamination in CMB anisotropy experiments. II. Straylight evaluationMar 29 2003Satellite CMB anisotropy missions and new generation of balloon-borne and ground experiments, make use of complex multi-frequency instruments at the focus of a meter class telescope. Between 70 GHz and 300 GHz, where foreground contamination is minimum, ... More
Evolution of dark-matter haloes in a variety of dark-energy cosmologiesApr 26 2004High-resolution, numerical simulations of 17 cluster-sized dark-matter haloes in eight different cosmologies with and without dynamical dark energy confirm the picture that core halo densities are imprinted early during their formation by the mean cosmological ... More
Maximum likelihood, parametric component separation and CMB B-mode detection in suborbital experimentsApr 27 2010We investigate the performance of the parametric Maximum Likelihood component separation method in the context of the CMB B-mode signal detection and its characterization by small-scale CMB suborbital experiments. We consider high-resolution (FWHM=8') ... More
Estimating the spectral indices of correlated astrophysical foregrounds by a second-order statistical approachSep 26 2006We present the first tests of a new method, the Correlated Component Analysis (CCA) based on second-order statistics, to estimate the mixing matrix, a key ingredient to separate astrophysical foregrounds superimposed to the Cosmic Microwave Background ... More
Separation of correlated astrophysical sources using multiple-lag data covariance matricesJul 06 2004This paper deals with a source separation strategy based on second-order statistics, namely, on data covariance matrices estimated at several lags. In general, ``blind'' approaches to source separation do not assume any knowledge on the mixing operator; ... More
Digital Deblurring of CMB Maps: Performance and Efficient ImplementationJan 24 2003Digital deblurring of images is an important problem that arises in multifrequency observations of the Cosmic Microwave Background (CMB) where, because of the width of the point spread functions (PSF), maps at different frequencies suffer a different ... More
Estimating the tensor-to-scalar ratio and the effect of residual foreground contaminationApr 07 2011Jul 28 2011We consider future balloon-borne and ground-based suborbital experiments designed to search for inflationary gravitational waves, and investigate the impact of residual foregrounds that remain in the estimated cosmic microwave background maps. This is ... More
WMAP 3yr data with the CCA: anomalous emission and impact of component separation on the CMB power spectrumJul 03 2007Jul 24 2007The Correlated Component Analysis (CCA) allows us to estimate how the different diffuse emissions mix in CMB experiments, exploiting also complementary information from other surveys. It is especially useful to deal with possible additional components. ... More
Digital Deblurring of CMB Maps II: Asymmetric Point Spread FunctionSep 04 2003In this second paper in a series dedicated to developing efficient numerical techniques for the deblurring Cosmic Microwave Background (CMB) maps, we consider the case of asymmetric point spread functions (PSF). Although conceptually this problem is not ... More
Formation of Spheroidal Galaxies: The Sub-MM ViewJul 13 2001The intensity of the Cosmic Far-IR Background and the strong evolution of galaxies in the far-IR to mm wavelength range demonstrate that the bulk of starlight emitted during the early phases of galaxy evolution was reprocessed by dust. Therefore, the ... More
Astrophysical components separation of COBE-DMR 4yr data with FastICAMar 31 2003We present an application of the fast Independent Component Analysis method to the COBE-DMR 4yr data. Although the signal-to-noise ratio in the COBE-DMR data is typically $\sim 1$, the approach is able to extract the CMB signal with high confidence when ... More
Polarization Properties of Extragalactic Radio Sources and Their Contribution to Microwave Polarization FluctuationsSep 24 2002We investigate the statistical properties of the polarized emission of extragalactic radio sources and estimate their contribution to the power spectrum of polarization fluctuations in the microwave region. The basic ingredients of our analysis are the ... More
CMB signal in WMAP 3yr data with FastICASep 08 2006We present an application of the fast Independent Component Analysis (FastICA) to the WMAP 3yr data with the goal of extracting the CMB signal. We evaluate the confidence of our results by means of Monte Carlo simulations including CMB, foreground contaminations ... More
Early structure formation in quintessence models and its implications for cosmic reionisation from first starsJul 18 2006Sep 21 2006We present the first hydrodynamic N-body simulations of primordial gas clouds responsible for the reionisation process in dark energy cosmologies. We compare the cosmological constant scenario with a SUGRA quintessence model with marked dynamics in order ... More
Merging Rates of Compact Binaries in Galaxies: Perspectives for Gravitational Wave DetectionsJul 16 2019We investigate the merging rates of compact binaries in galaxies, and the related detection rate of gravitational wave (GW) events with AdvLIGO/Virgo and with the Einstein Telescope. To this purpose, we rely on three basic ingredients: (i) the redshift-dependent ... More
Extracting cosmic microwave background polarisation from satellite astrophysical mapsSep 27 2002Jul 12 2004We present the application of the Fast Independent Component Analysis ({\ica}) technique for blind component separation to polarized astrophysical emission. We study how the Cosmic Microwave Background (CMB) polarized signal, consisting of $E$ and $B$ ... More
Power spectrum of the polarized diffuse Galactic radio emissionSep 08 2000Mar 23 2001We have analyzed the available polarization surveys of the Galactic emission to estimate to what extent it may be a serious hindrance to forthcoming experiments aimed at detecting the polarized component of Cosmic Microwave Background (CMB) anisotropies. ... More
Correlated Component Analysis for diffuse component separation with error estimation on simulated Planck polarization dataJun 11 2010We present a data analysis pipeline for CMB polarization experiments, running from multi-frequency maps to the power spectra. We focus mainly on component separation and, for the first time, we work out the covariance matrix accounting for errors associated ... More
Dark energy records in lensed cosmic microwave backgroundJul 27 2005Sep 22 2006We consider the weak lensing effect induced by linear cosmological perturbations on the cosmic microwave background (CMB) polarization anisotropies. We find that the amplitude of the lensing peak in the BB mode power spectrum is a faithful tracer of the ... More
Coupled and Extended Quintessence: theoretical differences and structure formationFeb 08 2008May 21 2008The case of a coupling between dark energy and matter (Coupled Quintessence) or gravity (Extended Quintessence) has recently attracted a deep interest and has been widely investigated both in the Einstein and in the Jordan frames (EF, JF), within scalar ... More
Clustering properties and gravitational lensing of forming spheroidal galaxiesNov 13 2001We show that the predictions of the recent physical model by Granato et al. (2001) are fully consistent with the available estimates of the clustering properties of galaxies at (sub)-mm wavelengths. The model is then exploited to compute the expected ... More
Astrophysical and Cosmological Information from Large-scale sub-mm Surveys of Extragalactic SourcesMar 09 2007We present a quantitative analysis of the astrophysical and cosmological information that can be extracted from the many important wide-area, shallow surveys that will be carried out in the next few years. Our calculations combine the predictions of the ... More
Perturbations in Quintessential InflationNov 24 1998Recently Peebles and Vilenkin proposed and quantitatively analyzed the fascinating idea that a substantial fraction of the present cosmic energy density could reside in the vacuum potential energy of the scalar field responsible for inflation (quintessential ... More
Dark-energy constraints with ALMA polarization measurementsMar 02 2007The Cosmic Microwave Background (CMB) physics can be used to constrain the dark energy dynamics: B modes of the polarization of the diffuse CMB emission as well as the polarized signal towards clusters of galaxies are sensitive to the Hubble expansion ... More
Early time perturbations behaviour in scalar field cosmologiesNov 10 1998Feb 17 1999We consider the problem of the initial conditions and behaviour of the perturbations in scalar field cosmology with general potential. We use the general definition of adiabatic and isocurvature conditions to set the appropriate initial values for the ... More
The CMB as a dark energy probeJun 03 2006We give a brief review of the known effects of a dynamical vacuum cosmological component, the dark energy, on the anisotropies of the cosmic microwave background (CMB). We distinguish between a "classic" class of observables, used so far to constrain ... More
On the dark energy clustering propertiesJan 20 2002Apr 08 2002We highlight a viable mechanism leading to the formation of dark energy structures on sub-horizon cosmological scales, starting from linear perturbations in scalar-tensor cosmologies. We show that the coupling of the dark energy scalar field, or Quintessence, ... More
Effects of inflationary bubbles on the polarization and temperature anisotropies of the cosmic microwave backgroundNov 30 1999We predict the imprint of linear bubbly perturbations on the polarization and temperature anisotropies of the cosmic microwave background (CMB). We analytically model a bubbly density perturbation at the beginning of the radiation dominated era and we ... More
Bayesian foreground analysis with CMB dataApr 07 2006The quality of CMB observations has improved dramatically in the last few years, and will continue to do so in the coming decade. Over a wide range of angular scales, the uncertainty due to instrumental noise is now small compared to the cosmic variance. ... More
All-sky astrophysical component separation with Fast Independent Component Analysis (FastICA)Aug 22 2001We present a new, fast, algorithm for the separation of astrophysical components superposed in maps of the sky, based on the fast Independent Component Analysis technique (FastICA). It allows to recover both the spatial pattern and the frequency scalings ... More
The Impact of the Spectral Response of an Achromatic Half-Wave Plate on the Measurement of the Cosmic Microwave Background PolarizationDec 13 2011We study the impact of the spectral dependence of the linear polarization rotation induced by an achromatic half-wave plate on measurements of cosmic microwave background polarization in the presence of astrophysical foregrounds. We focus on the systematic ... More
Neural networks and separation of Cosmic Microwave Background and astrophysical signals in sky mapsFeb 11 2000Jun 21 2000The Independent Component Analysis (ICA) algorithm is implemented as a neural network for separating signals of different origin in astrophysical sky maps. Due to its self-organizing capability, it works without prior assumptions on the signals, neither ... More
Forecasting Polarized Radio Sources for CMB observationsDec 27 2017We combined the latest datasets obtained with different surveys to study the frequency dependence of polarized emission coming from the Extragalactic Radio Sources (ERS). We consider data within a very wide frequency range starting from $1.4 $ GHz up ... More
The S-PASS view of polarized Galactic Synchrotron at 2.3 GHz as a contaminant to CMB observationsFeb 04 2018We analyze the Southern Sky emission in linear polarization at 2.3 GHz as observed by the S-band Polarization All Sky Survey S-PASS. Our purpose is to study the properties of the diffuse Galactic polarized synchrotron as a contaminant to CMB B-mode observations. ... More
The Origin of the Universe as Revealed Through the Polarization of the Cosmic Microwave BackgroundFeb 22 2009Modern cosmology has sharpened questions posed for millennia about the origin of our cosmic habitat. The age-old questions have been transformed into two pressing issues primed for attack in the coming decade: How did the Universe begin? and What physical ... More
Extended Quintessence: imprints on the cosmic microwave background spectraFeb 12 2000We describe the observable features of the recently proposed Extended Quintessence scenarios on the Cosmic Microwave Background (CMB) anisotropy spectra. In this class of models a scalar field $\phi$, assumed to provide most of the cosmic energy density ... More
Extended QuintessenceJun 03 1999Sep 20 1999We study Quintessence cosmologies in the context of scalar-tensor theories of gravity, where a scalar field $\phi$, assumed to provide most of the cosmic energy density today, is non-minimally coupled to the Ricci curvature scalar $R$. Such `Extended ... More
CMB component separation by parameter estimationAug 11 2005We propose a solution to the CMB component separation problem based on standard parameter estimation techniques. We assume a parametric spectral model for each signal component, and fit the corresponding parameters pixel by pixel in a two-stage process. ... More
Stochastic gravitational wave background from cold dark matter halosSep 22 2005Mar 04 2006The current knowledge of cosmological structure formation suggests that Cold Dark Matter (CDM) halos possess a nonspherical density profile, implying that cosmic structures can be potential sources of gravitational waves via power transfer from scalar ... More
Workshop summary and the futureNov 26 2001We present a tentative summary of the many very interesting issues that have been addresses at this workshop, focussing in particular on the perspectives for measuring the polarization power spectra of the Cosmic Microwave Background produced by scalar ... More
Reconciling Inflation with OpennessApr 27 1995It is already understood that the increasing observational evidence for an open Universe may be reconciled with inflation if our horizon is contained inside one single huge bubble nucleated during the inflationary phase transition. In the scenario we ... More
Cosmic microwave background constraints on dark energy dynamics: analysis beyond the power spectrumNov 25 2004May 18 2005We consider the distribution of the non-Gaussian signal induced by weak lensing on the primary total intensity cosmic microwave background (CMB) anisotropies. Our study focuses on the three point statistics exploiting an harmonic analysis based on the ... More
Weak lensing, structure formation and dark energySep 16 2003We study how CMB bispectrum, produced by weak gravitational lensing and structure formation, can constrain the redshift evolution of the dark energy equation of state independently on its present value. Analyzing the line of sight contribution to the ... More
Weak lensing in generalized gravity theoriesMar 29 2004May 18 2004We extend the theory of weak gravitational lensing to cosmologies with generalized gravity, described in the Lagrangian by a generic function depending on the Ricci scalar and a non-minimal coupled scalar field. We work out the generalized Poisson equations ... More
Scaling solutions in scalar-tensor cosmologiesAug 26 2005Dec 06 2005The possibility of a connection between dark energy and gravity through a direct coupling in the Lagrangian of the underlying theory has acquired an increasing interest due to the recently discovered capability of the extended quintessence model to encompass ... More
Principal component analysis of the primordial tensor power spectrumMay 20 2019We study how the shape of the spectrum of primordial gravitational waves can be constrained by future experiments looking at the B-mode of the Cosmic Microwave Background (CMB) polarization. We implement a Principal Component Analysis (PCA) including ... More
Probing Cosmic Strings with Satellite CMB measurementsApr 07 2010Aug 30 2010We study the problem of searching for cosmic string signal patterns in the present high resolution and high sensitivity observations of the Cosmic Microwave Background (CMB). This article discusses a technique capable of recognizing Kaiser-Stebbins effect ... More
Science from an Ultra-Deep, High-Resolution Millimeter-Wave SurveyMar 08 2019Opening up a new window of millimeter-wave observations that span frequency bands in the range of 30 to 500 GHz, survey half the sky, and are both an order of magnitude deeper (about 0.5 uK-arcmin) and of higher-resolution (about 10 arcseconds) than currently ... More
Reconciling inflation with opennessSep 12 1996It is already understood that the increasing observational evidence for an open Universe can be reconciled with inflation if our horizon is contained inside one single huge bubble nucleated during the inflationary phase transition. In this frame of ideas, ... More
Extended quintessence with an exponential couplingDec 14 2004Jan 18 2005We study a class of extended quintessence cosmologies where the scalar field playing the role of the dark energy is exponentially coupled to the Ricci scalar. We find that the dynamics induced by the effective gravitational potential in the Klein-Gordon ... More
Approaching Lambda without fine-tuningMar 19 2004Aug 03 2004We address the fine-tuning problem of dark energy cosmologies which arises when the dark energy density needs to initially lie in a narrow range in order for its present value to be consistent with observations. As recently noticed, this problem becomes ... More
Tracking Extended QuintessenceMay 26 2000Aug 30 2000We study the cosmological role of a Tracking Field $\phi$ in Extended Quintessence scenarios (TEQ), where the dynamical vacuum energy driving the acceleration of the universe today is coupled with the Ricci scalar, $R$, with a term of the form $F(\phi)R/2$, ... More
Weak lensing and gravity theoriesSep 05 2004We present the theory of weak gravitational lensing in cosmologies with generalized gravity, described in the Lagrangian by a generic function depending on the Ricci scalar and a non-minimally coupled scalar field. We work out the generalized Poisson ... More
Halo Concentrations and Weak-Lensing Number Counts in Dark Energy CosmologiesJun 28 2002We study the effects of a dark energy component with equation of state p=w rho with constant w >= -1 on the formation of Cold Dark Matter (CDM) haloes. We find two main effects: first, haloes form earlier as w increases, and second, the amplitude of the ... More
Cross-correlation between the CMB lensing potential measured by Planck and high-z sub-mm galaxies detected by the Herschel-ATLAS surveyOct 16 2014Apr 23 2015We present the first measurement of the correlation between the map of the cosmic microwave background (CMB) lensing potential derived from the \emph{Planck} nominal mission data and $z\gtrsim 1.5$ galaxies detected by the \emph{Herschel}-ATLAS (H-ATLAS) ... More
Making Maps from Planck LFI 30GHz DataFeb 19 2007This paper is one of a series describing the performance and accuracy of map-making codes as assessed by the Planck CTP working group. We compare the performance of multiple codes written by different groups for making polarized maps from Planck-sized, ... More
Full-sky maps for gravitational lensing of the CMBNov 16 2007Jun 17 2008We use the large cosmological Millennium Simulation (MS) to construct the first all-sky maps of the lensing potential and the deflection angle, aiming at gravitational lensing of the CMB, with the goal of properly including small-scale non-linearities ... More
Non-minimally coupled dark matter: effective pressure and structure formationMar 26 2012Jul 13 2012We propose a phenomenological model in which a non-minimal coupling between gravity and dark matter is present in order to address some of the apparent small scales issues of \lcdm model. When described in a frame in which gravity dynamics is given by ... More
The High Redshift Integrated Sachs-Wolfe EffectJul 27 2009Sep 01 2009In 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 Integrated Sachs-Wolfe (ISW) effect at high redshift, aiming at constraining ... More
New Constraints On The Dark Energy Equation of StateMar 18 2013We combine recent measurements of Cosmic Microwave Background Anisotropies, Supernovae luminosity distances and Baryonic Acoustic Oscillations to derive constraints on the dark energy equation of state w in the redshift range 0<z<2, using a principal ... More
Imaging the first light: experimental challenges and future perspectives in the observation of the Cosmic Microwave Background AnisotropyFeb 23 2004Measurements of the cosmic microwave background (CMB) allow high precision observation of the Last Scattering Surface at redshift $z\sim$1100. After the success of the NASA satellite COBE, that in 1992 provided the first detection of the CMB anisotropy, ... More
Planck intermediate results. LIV. The Planck Multi-frequency Catalogue of Non-thermal SourcesFeb 23 2018Sep 11 2018This paper presents the Planck Multi-frequency Catalogue of Non-thermal (i.e. synchrotron-dominated) Sources (PCNT) observed between 30 and 857 GHz by the ESA Planck mission. This catalogue was constructed by selecting objects detected in the full mission ... More
Planck 2018 results. XI. Polarized dust foregroundsJan 15 2018Nov 12 2018The study of polarized dust emission has become entwined with the analysis of the cosmic microwave background (CMB) polarization. We use new Planck maps to characterize Galactic dust emission as a foreground to the CMB polarization. We present Planck ... More
Making Maps from Planck LFI 30GHz Data with Asymmetric Beams and Cooler NoiseJun 19 2008Apr 09 2009The Planck satellite will observe the full sky at nine frequencies from 30 to 857 GHz. The goal of this paper is to examine the effects of four realistic instrument systematics in the 30 GHz frequency maps: non-axially-symmetric beams, sample integration, ... More
Making sky maps from Planck dataJun 14 2006We compare the performance of multiple codes written by different groups for making polarized maps from Planck-sized, all-sky cosmic microwave background (CMB) data. Three of the codes are based on a destriping algorithm; the other three are implementations ... More
Lensed CMB temperature and polarization maps from the Millennium SimulationOct 22 2008Mar 06 2009We have constructed the first all-sky CMB temperature and polarization lensed maps based on a high-resolution cosmological N-body simulation, the Millennium Simulation (MS). We have exploited the lensing potential map obtained using a map-making procedure ... More
N-body lensed CMB maps: lensing extraction and characterizationNov 27 2013Mar 02 2014We reconstruct shear maps and angular power spectra from simulated weakly lensed total intensity (TT) and polarised (EB) maps of the Cosmic Microwave Background (CMB) anisotropies, obtained using Born approximated ray-tracing through the N-body simulated ... More
Constraints on flat cosmologies with tracking Quintessence from Cosmic Microwave Background observationsSep 06 2001Jan 08 2002We constrain cosmological parameters in flat cosmologies with tracking dark energy (or Quintessence) using the existing data on Cosmic Microwave Background (CMB) anisotropies. We perform a maximum likelihood analysis using combined data from COBE/DMR, ... More
Maps of CMB lensing deflection from N-body simulations in Coupled Dark Energy CosmologiesMay 03 2013Aug 06 2013We produce lensing potential and deflection-angle maps in order to simulate CMB weak-lensing via ray-tracing through the COupled Dark Energy Cosmological Simulations (CoDECS). The constructed maps reflect the N-body cosmic structures on a range of scales ... More
Arc Statistics in Cosmological Models with Dark EnergyOct 02 2002Aug 04 2003We investigate how the probability of the formation of giant arcs in galaxy clusters is expected to change in cosmological models dominated by dark energy with an equation of state p=w rho c^2 compared to cosmological-constant or open models. To do so, ... More
Stochastic gravitational background from inflationary phase transitionsSep 16 1997We consider true vacuum bubbles generated in a first order phase transition occurring during the slow rolling era of a two field inflation: it is known that gravitational waves are produced by the collision of such bubbles. We find that the epoch of the ... More
Multiple Lensing of the Cosmic Microwave Background anisotropiesSep 26 2014Mar 02 2015We study the gravitational lensing effect on the Cosmic Microwave Background (CMB) anisotropies performing a ray-tracing of the primordial CMB photons through intervening large-scale structures (LSS) distribution predicted by N-Body numerical simulations ... More
CMB lensing reconstruction in the presence of diffuse polarized foregroundsJul 02 2012Dec 16 2012The measurement and characterization of the lensing of the cosmic microwave background (CMB) is key goal of the current and next generation of CMB experiments. We perform a case study of a three-channel balloon-borne CMB experiment observing the sky at ... More
Observing patchy reionization with future CMB polarization experimentsJan 08 2018Apr 26 2018We study the signal from patchy reionization in view of the future high accuracy polarization measurements of the Cosmic Microwave Background (CMB). We implement an extraction procedure of the patchy reionization signal analogous to CMB lensing. We evaluate ... More
Polarized Foregrounds Power Spectra vs CMBNov 08 2001We briefly review our work about the polarized foreground contamination of the Cosmic Microwave Background maps. We start by summarizing the main properties of the polarized cosmological signal, resulting in "electric" (E) and "magnetic" (B) components ... More
Reconstruction of the bubble nucleating potentialOct 04 1996We calculate analytically the bubble nucleation rate in a model of first order inflation which is able to produce large scale structure. The computation includes the first-order departure from the thin-wall limit, the explicit derivation of the pre-exponential ... More
Measuring primordial gravitational waves from CMB B-modes in cosmologies with generalized expansion historiesAug 20 2012Feb 05 2013We evaluate our capability to constrain the abundance of primordial tensor perturbations in cosmologies with generalized expansion histories in the epoch of cosmic acceleration. Forthcoming satellite and sub-orbital experiments probing polarization in ... More
Constraints on coupled dark energy using CMB data from WMAP and SPTJul 13 2012We consider the case of a coupling in the dark cosmological sector, where a dark energy scalar field modifies the gravitational attraction between dark matter particles. We find that the strength of the coupling {\beta} is constrained using current Cosmic ... More
Separating polarized cosmological and galactic emissions for CMB B-mode polarization experimentsMay 18 2005Nov 14 2006In this work we study the relevance of the component separation technique based on the Independent Component Analysis (ICA) and investigate its performance in the context of a limited sky coverage observation and from the viewpoint of our ability to differentiate ... More
Measuring the speed of cosmological gravitational wavesMay 30 2014Jun 11 2014In general relativity gravitational waves propagate at the speed of light, however in alternative theories of gravity that might not be the case. We study the effects of a modified speed of gravity, $c_T^2$, on the B-modes of the Cosmic Microwave Background ... More
Detectability of the $τ$-21cm cross-correlation: a tomographic probe of patchy reionizationApr 04 2019The cross-correlation between fluctuations in the electron scattering optical depth as probed by future Cosmic Microwave Background (CMB) experiments, and fluctuations in the 21-cm brightness temperature as probed by ground-based radio interferometers, ... More
Planck intermediate results. LIII. Detection of velocity dispersion from the kinetic Sunyaev-Zeldovich effectJul 01 2017Aug 23 2018Using the ${\it Planck}$ full-mission data, we present a detection of the temperature (and therefore velocity) dispersion due to the kinetic Sunyaev-Zeldovich (kSZ) effect from clusters of galaxies. To suppress the primary CMB and instrumental noise we ... More
CMBPol Mission Concept Study: Prospects for polarized foreground removalNov 24 2008Nov 02 2009In this report we discuss the impact of polarized foregrounds on a future CMBPol satellite mission. We review our current knowledge of Galactic polarized emission at microwave frequencies, including synchrotron and thermal dust emission. We use existing ... More
Planck intermediate results. XXII. Frequency dependence of thermal emission from Galactic dust in intensity and polarizationMay 05 2014May 11 2015Planck has mapped the intensity and polarization of the sky at microwave frequencies with unprecedented sensitivity. We make use of the Planck 353 GHz I, Q, and U Stokes maps as dust templates, and cross-correlate them with the Planck and WMAP data at ... More
Planck intermediate results. XV. A study of anomalous microwave emission in Galactic cloudsSep 05 2013May 17 2014Anomalous microwave emission (AME) is believed to be due to electric dipole radiation from small spinning dust grains. The aim of this paper is a statistical study of the basic properties of AME regions and the environment in which they emit. We used ... More
Planck 2018 results. I. Overview and the cosmological legacy of PlanckJul 17 2018The European Space Agency's Planck satellite, which was dedicated to studying the early Universe and its subsequent evolution, was launched on 14 May 2009. It scanned the microwave and submillimetre sky continuously between 12 August 2009 and 23 October ... More
Dust and star-formation properties of a complete sample of local galaxies drawn from the Planck Early Release Compact Source CatalogueMay 07 2013We combine Planck HFI data at 857, 545, 353 & 217GHz with data from WISE, Spitzer, IRAS & Herschel to investigate the properties of a flux limited sample of local star-forming galaxies. A 545GHz flux density limit was chosen so that the sample is 80% ... More