Search Publications
Testing gravity on cosmic scales: A case study of Jordan-Brans-Dicke theory
Joudaki, Shahab; Ferreira, Pedro G.; Lima, Nelson A. +1 more
We provide an end-to-end exploration of a distinct modified gravitational theory in Jordan-Brans-Dicke (JBD) gravity, from an analytical and numerical description of the background expansion and linear perturbations, to the nonlinear regime captured with a hybrid suite of N -body simulations, to the cosmological constraints from existing probes of…
Strong constraints on primordial black hole dark matter from 16 years of INTEGRAL/SPI observations
Calore, F.; Serpico, P. D.; Siegert, T. +2 more
We present a new analysis of the diffuse soft γ -ray emission toward the inner Galaxy as measured by the spectrometer aboard the INTEGRAL satellite (SPI) with 16 years of data taking. The analysis implements a spatial template fit of SPI data and an improved instrumental background model. We characterize the contribution of primordial black holes …
Detection and characterization of instrumental transients in LISA Pathfinder and their projection to LISA
Baghi, Quentin; Korsakova, Natalia; Slutsky, Jacob +3 more
The LISA Pathfinder (LPF) mission succeeded outstandingly in demonstrating key technological aspects of future space-borne gravitational-wave detectors, such as the Laser Interferometer Space Antenna (LISA). Specifically, LPF demonstrated with unprecedented sensitivity the measurement of the relative acceleration of two free-falling cubic test mas…
Galaxy luminosity function pipeline for cosmology and astrophysics
Muñoz, Julian B.; Sabti, Nashwan; Blas, Diego
Observations of high-redshift galaxies have provided us with a rich tool to study the physics at play during the epoch of reionization. The luminosity function (LF) of these objects is an indirect tracer of the complex processes that govern galaxy formation, including those of the first dark-matter structures. In this work, we present an extensive…
Constraining the stochastic gravitational wave background with photometric surveys
Doré, Olivier; Wang, Yijun; Pardo, Kris +1 more
The detection of the stochastic gravitational wave background (SGWB) is essential for understanding black hole populations, especially for supermassive black hole binaries. The recent promising results from various pulsar timing array (PTA) collaborations allude to an imminent detection. In this paper, we investigate the relative astrometric gravi…
Can high-redshift Hubble diagrams rule out the standard model of cosmology in the context of cosmography?
Pourojaghi, S.; Zabihi, N. F.; Malekjani, M.
Using mock data for the Hubble diagrams of type Ia supernovae (SNIa) and quasars (QSOs) generated based on the standard model of cosmology, and using the least-squares method based on the Markov-Chain-Monte-Carlo (MCMC) algorithm, we first put constraints on the cosmographic parameters in the context of the various model-independent cosmographic m…
Transient acceleration events in LISA Pathfinder data: Properties and possible physical origin
Mendes, L.; Russano, G.; Nofrarias, M. +79 more
We present an in depth analysis of the transient events, or glitches, detected at a rate of about one per day in the differential acceleration data of LISA Pathfinder. We show that these glitches fall in two rather distinct categories: fast transients in the interferometric motion readout on one side, and true force transient events on the other. …
511 keV line constraints on feebly interacting particles from supernovae
Calore, Francesca; Carenza, Pierluca; Giannotti, Maurizio +4 more
Feebly interacting particles with masses with O (10 - 100 ) MeV can be copiously produced by core-collapse supernovae (SNe). In this paper we consider the case of MeV-ish sterile neutrinos and dark photons mixed with ordinary neutrinos and photons, respectively. Furthermore, both sterile neutrinos and dark photons may decay into positrons on their…
Sensor noise in LISA Pathfinder: An extensive in-flight review of the angular and longitudinal interferometric measurement system
Mendes, L.; Russano, G.; Sanjuan, J. +84 more
In a previous article [1], we have reported on the first subpicometer interferometer flown in space as part of ESA's LISA Pathfinder mission, and have shown the residual sensor noise to be on the level of 32.0-1.7+2.4 fm /√{Hz } . This review provides a deeper and more complete overview of the full system and its interferomet…
Modeling intrinsic galaxy alignment in the MICE simulation
Carretero, Jorge; Castander, Francisco J.; DES Collaboration +9 more
The intrinsic alignment (IA) of galaxies is potentially a major limitation in deriving cosmological constraints from weak lensing surveys. In order to investigate this effect, we assign intrinsic shapes and orientations to galaxies in the light-cone output of the MICE simulation, spanning ∼5000 deg2 and reaching redshift z =1.4 . This a…