Probing magnetic fields with multi-frequency polarized synchrotron emission (2009)
Thiebaut, Jerome, Prunet, Simon, Pichon, Christophe, Thiébaut, Eric
We investigate the problem of probing the local spatial structure of the magnetic field of the interstellar medium using multi-frequency polarized maps of the synchrotron emission at radio...
Samal, Pramoda Kumar, Saha, Rajib, Delabrouille, Jacques, Prunet, Simon, Jain, Pankaj, Souradeep, Tarun
We estimate CMB polarization and temperature power spectra using WMAP 5-year foreground contaminated maps. The power spectrum is estimated by using a model independent method, which does not utilize...
Estimation of cosmological parameters using adaptive importance sampling (2009)
Wraith, Darren, Kilbinger, Martin, Benabed, Karim, Cappé, Olivier, Cardoso, Jean-François, Fort, Gersende, ...
We present a Bayesian sampling algorithm called adaptive importance sampling or Population Monte Carlo (PMC), whose computational workload is easily parallelizable and thus has the potential to...
Probing magnetic fields with multi-frequency polarized synchrotron emission (2009)
Thiebaut, Jerome, Prunet, Simon, Pichon, Christophe, Thiébaut, Eric
We investigate the problem of probing the local spatial structure of the magnetic field of the interstellar medium using multi-frequency polarized maps of the synchrotron emission at radio...
Probing magnetic fields with multi-frequency polarized synchrotron emission (2009)
Thiebaut, Jerome, Prunet, Simon, Pichon, Christophe, Thiébaut, Eric
We investigate the problem of probing the local spatial structure of the magnetic field of the interstellar medium using multi-frequency polarized maps of the synchrotron emission at radio...
Full-Sky Weak Lensing Simulation with 70 Billion Particles (2008)
Teyssier, Romain, Pires, Sandrine, Prunet, Simon, Aubert, Dominique, Pichon, Christophe, Amara, Adam, ...
We have performed a 70 billion dark-matter particles N-body simulation in a 2 $h^{-1}$ Gpc periodic box, using the concordance, cosmological model as favored by the latest WMAP3 results. We have...
On the Onset of Stochasticity in $\Lambda$CDM Cosmological Simulations (2008)
Thiebaut, Jerome, Pichon, Christophe, Sousbie, Thierry, Prunet, Simon, Pogosyan, D.
The onset of stochasticity is measured in $\Lambda$CDM cosmological simulations using a set of classical observables. It is quantified as the local derivative of the logarithm of the dispersion of a...
On the Onset of Stochasticity in $\Lambda$CDM Cosmological Simulations (2008)
Thiebaut, Jerome, Pichon, Christophe, Sousbie, Thierry, Prunet, Simon, Pogosyan, D.
The onset of stochasticity is measured in $\Lambda$CDM cosmological simulations using a set of classical observables. It is quantified as the local derivative of the logarithm of the dispersion of a...
On the Onset of Stochasticity in $\Lambda$CDM Cosmological Simulations (2008)
Thiebaut, Jerome, Pichon, Christophe, Sousbie, Thierry, Prunet, Simon, Pogosyan, D.
The onset of stochasticity is measured in $\Lambda$CDM cosmological simulations using a set of classical observables. It is quantified as the local derivative of the logarithm of the dispersion of a...
CMB anisotropy power spectrum using linear combinations of WMAP maps (2007)
Saha, Rajib, Prunet, Simon, Jain, Pankaj, Souradeep, Tarun
In recent years the goal of estimating different cosmological parameters precisely has set new challenges in the effort to accurately measure the angular power spectrum of CMB. This has required...
Fast Edge Corrected Measurement of the Two-Point Correlation Function and the Power Spectrum (2005)
Szapudi, István, Pan, Jun, Prunet, Simon, Budavári, Tamás
We present two related techniques to measure the two-point correlation function and the power spectrum with edge correction in any spatial dimensions. The underlying algorithm uses fast Fourier...
Polarisation du ciel micro-ondes (2005)
La mission ESA Planck offre une opportunité sans précédent de mesurer de manière très précise la polarisation de l'émission Galactique et extragalactique dans le domaine millimétrique et...
Constraints on mode couplings and modulation of the CMB with WMAP data (2004)
Prunet, Simon, Uzan, Jean-Philippe, Bernardeau, Francis, Brunier, Tristan
We investigate a possible asymmetry in the statistical properties of the cosmic microwave background temperature field and to do so we construct an estimator aiming at detecting a dipolar modulation....
Fast estimation of polarization power spectra using correlation functions (2003)
Chon, Gayoung, Challinor, Anthony, Prunet, Simon, Hivon, Eric, Szapudi, Istvan
We present a fast method for estimating the cosmic microwave background polarization power spectra using unbiased estimates of heuristically-weighted correlation functions. This extends the...
Dust Polarization From Starlight Data (2001)
Fosalba, Pablo, Lazarian, Alex, Prunet, Simon, Tauber, Jan A.
We present a statistical analysis of the interstellar medium (ISM) polarization from the largest compilation available of starlight data, which comprises ~ 5500 stars. The measured correlation...
Statistical Properties of Galactic Starlight Polarization (2001)
Fosalba, Pablo, Lazarian, Alex, Prunet, Simon, Tauber, Jan A.
We present a statistical analysis of Galactic interstellar polarization from the largest compilation available of starlight data. The data comprises ~ 9300 stars of which we have selected ~ 5500 for...
Fast CMB Analyses via Correlation Functions (2000)
Szapudi, Istvan, Prunet, Simon, Pogosyan, Dmitry, Szalay, Alexander S., Bond, J. Richard
We propose and implement a fast, universally applicable method for extracting the angular power spectrum C_l from CMB temperature maps by first estimating the correlation function \xi(\theta). Our...
Detectability of the primordial origin of the gravitational wave background in the Universe (1999)
Lesgourgues, Julien, Polarski, David, Prunet, Simon, Starobinski, A. A.
The appearance of peaks in the Fourier power spectra of various primordial fluctuations is a generic prediction of the inflationary scenario. We investigate whether future experiments, in particular...
Lesgourgues, Julien, Prunet, Simon, Polarski, David
We consider a class of spatially flat cold dark matter (CDM) models, with a cosmological constant and a broken-scale-invariant (BSI) steplike primordial spectrum of adiabatic perturbations,...
Polarisation du ciel micro-ondes (1998)
La mission ESA Planck offre une opportunité sans précédent de mesurer de manière très précise la polarisation de l'émission Galactique et extragalactique dans le domaine millimétrique et...
Polarisation du ciel micro-ondes (1998)
La mission ESA Planck offre une opportunité sans précédent de mesurer de manière très précise la polarisation de l'émission Galactique et extragalactique dans le domaine millimétrique et...
Polarisation du ciel micro-ondes (1998)
La mission ESA Planck offre une opportunité sans précédent de mesurer de manière très précise la polarisation de l'émission Galactique et extragalactique dans le domaine millimétrique et...
Galactic dust polarized emission at high latitudes and CMB polarization (1998)
Sethi, Shiv K., Prunet, Simon, Bouchet, F. R.
We estimate the dust polarized emission in our galaxy at high galactic latitudes, which is the dominant foreground for measuring CMB polarization using the high frequency instrument (HFI) aboard...
Prunet, Simon, Sethi, Shiv K., Bouchet, Francois R.
We present a method of subtracting the foreground contamination for the measurement of CMB polarization. We calculate the resultant errors on CMB polarization and temperature-polarization cross...
Polarisation du ciel micro-ondes (1998)
La mission ESA Planck offre une opportunité sans précédent de mesurer de manière très précise la polarisation de l'émission Galactique et extragalactique dans le domaine millimétrique et...
Polarisation du ciel micro-ondes (1998)
La mission ESA Planck offre une opportunité sans précédent de mesurer de manière très précise la polarisation de l'émission Galactique et extragalactique dans le domaine millimétrique et...
Polarisation du ciel micro-ondes (1998)
La mission ESA Planck offre une opportunité sans précédent de mesurer de manière très précise la polarisation de l'émission Galactique et extragalactique dans le domaine millimétrique et...
The IGM at high redshift and galaxy formation (1997)
Blanchard, Alain, Prunet, Simon
The conditions for structure formation which ultimately lead to galaxies request further ingredients behind the simple collapse criteria. The Jean's criteria and the cooling criteria are those which...