Search Publications
Measurement of the pairwise kinematic Sunyaev-Zeldovich effect with Planck and BOSS data
Moodley, Kavilan; Ma, Yin-Zhe; Remazeilles, Mathieu +1 more
We present a new measurement of the kinetic Sunyaev-Zeldovich effect (kSZ) using Planck cosmic microwave background (CMB) and Baryon Oscillation Spectroscopic Survey (BOSS) data. Using the "LowZ North/South" galaxy catalogue from BOSS DR12, and the group catalogue from BOSS DR13, we evaluate the mean pairwise kSZ temperature associated with BOSS g…
Calibrating the system dynamics of LISA Pathfinder
Mendes, L.; Russano, G.; Lloro, I. +75 more
LISA Pathfinder (LPF) was a European Space Agency mission with the aim to test key technologies for future space-borne gravitational-wave observatories like LISA. The main scientific goal of LPF was to demonstrate measurements of differential acceleration between free-falling test masses at the sub-femto-g level, and to understand the residual acc…
First cosmological constraints combining Planck with the recent gravitational-wave standard siren measurement of the Hubble constant
Di Valentino, Eleonora; Melchiorri, Alessandro
The recent observations of gravitational-wave and electromagnetic emission produced by the merger of the binary neutron-star system GW170817 have opened the possibility of using standard sirens to constrain the value of the Hubble constant. While the reported bound of H0=7 0-8+12 at 68% C.L. is significantly weaker…
Probability of warm inflation in loop quantum cosmology
Ramos, Rudnei O.; Graef, L. L.
Warm inflation is analyzed in the context of loop quantum cosmology (LQC). The bounce in LQC provides a mean through which a Liouville measure can be defined, which has been used previously to characterize the a priori probability for inflation in LQC. Here we take advantage of the tools provided by LQC to study instead the a priori probability fo…
Constraining the polarization content of gravitational waves with astrometry
O'Beirne, Logan; Cornish, Neil J.
Gravitational waves perturb the paths of photons, impacting both the time of flight and the arrival direction of light from stars. Pulsar timing arrays can detect gravitational waves by measuring the variations in the time of flight of radio pulses, while astrometry missions such as Gaia can detect gravitational waves from the time-varying changes…
No evidence for dust B -mode decorrelation in Planck data
Sheehy, Christopher; Slosar, Anže
Constraints on inflationary B modes using cosmic microwave background polarization data commonly rely on either template cleaning or cross-spectra between maps at different frequencies to disentangle Galactic foregrounds from the cosmological signal. Assumptions about how the foregrounds scale with frequency are therefore crucial to interpreting t…
Do cosmological data rule out f (R ) with w ≠-1 ?
Battye, Richard A.; Pace, Francesco; Bolliet, Boris
We review the equation of state (EoS) approach to dark sector perturbations and apply it to f (R ) gravity models of dark energy. We show that the EoS approach is numerically stable and use it to set observational constraints on designer models. Within the EoS approach we build an analytical understanding of the dynamics of cosmological perturbati…
Searching for signatures of dark matter-dark radiation interaction in observations of large-scale structure
Knox, Lloyd; Pan, Zhen; Kaplinghat, Manoj
In this paper, we conduct a search in the latest large-scale structure measurements for signatures of the dark matter-dark radiation interaction proposed by Buen-Abad et al. (2015). We show that prior claims of an inference of this interaction at ∼3 σ significance rely on a use of the Sunyaev-Zeldovich cluster mass function that ignores uncertaint…
Testing the equivalence principle in space after the MICROSCOPE mission
Nobili, Anna M.; Anselmi, Alberto
Tests of the weak equivalence principle (WEP) can reveal a new, composition dependent, force of nature, or disprove many models of new physics. For the first time, such a test is being successfully carried out in space by the MICROSCOPE satellite. Early results show no violation of the WEP sourced by the Earth for Pt and Ti test masses with random…
Constraints on patchy reionization from Planck CMB temperature trispectrum
Namikawa, Toshiya
We present constraints on the patchy reionization by measuring the trispectrum of the Planck 2015 cosmic microwave background (CMB) temperature anisotropies. The patchy reionization leads to anisotropies in the CMB optical depth, and the statistics of the observed CMB anisotropies is altered. We estimate the trispectrum of the CMB temperature anis…