Search Publications
Updated constraints from the effective field theory analysis of the BOSS power spectrum on early dark energy
Poulin, Vivian; Smith, Tristan L.; Simon, Théo +1 more
Analyses of the full shape of the Baryon Oscillation Spectroscopic Survey (BOSS) DR12 power spectrum using the one-loop prediction from the effective field theory of large-scale structures (EFTBOSS) have led to new constraints on extensions to the Λ cold dark matter model, such as early dark energy (EDE), which has been suggested as a resolution t…
Early structure formation from cosmic string loops in light of early JWST observations
Refregier, Alexandre; Jiao, Hao; Brandenberger, Robert
Cosmic strings, if they exist, source nonlinear and non-Gaussian perturbations all the way back to the time of equal matter and radiation (and earlier). Here, we compute the mass function of halos seeded by a scaling distribution of cosmic string loops, and we compare the results with the predictions of the standard Gaussian Λ cold dark matter mod…
Phantom dark energy as a natural selection of evolutionary processes a ^ la genetic algorithm and cosmological tensions
Gangopadhyay, Mayukh R.; Sami, M.; Sharma, Mohit K.
We study the late-time cosmological tensions using the low-redshift background and redshift-space distortion data by employing a machine learning (ML) technique. By comparing the generated observables with the standard cosmological scenario, our findings indicate support for the phantom nature of dark energy, which ultimately leads to a reduction …
Constraining resonant dark matter self-interactions with strong gravitational lenses
Bovy, Jo; Gilman, Daniel; Zhong, Yi-Ming
We devise a method to constrain self-interacting dark matter (SIDM) from observations of quadruply imaged quasars, and apply it to five self-interaction potentials with a long-range dark force. We consider several SIDM models with an attractive potential that allows for the formation of quasibound states, giving rise to resonant features in the cr…
Hunting for dark matter and new physics with GECCO
Moiseev, A. A.; Profumo, Stefano; Baring, Matthew G. +9 more
We outline the science opportunities in the areas of searches for dark matter and new physics offered by a proposed future MeV gamma-ray telescope, the Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO). We point out that such an instrument would play a critical role in opening up a discovery window for particle dark matter wit…
First search for ultralight dark matter with a space-based gravitational-wave antenna: LISA Pathfinder
Miller, Andrew L.; Mendes, Luis
We present here results from the first-ever search for dark-photon dark matter that could have coupled to baryons in LISA Pathfinder, the technology demonstrator for a space-based gravitational-wave antenna. After analyzing approximately three months of data taken by LISA Pathfinder in the frequency range [2 ×10-5,5 ] Hz , corresponding…
Multipole expansion of the local expansion rate
Kalbouneh, Basheer; Marinoni, Christian; Bel, Julien
We design a new observable, the expansion rate fluctuation η , to characterize deviations from the linear relation between redshift and distance in the local universe. We also show how to compress the resulting signal into spherical harmonic coefficients in order to better decipher the structure and symmetries of the anisotropies in the local expa…
Charging of free-falling test masses in orbit due to cosmic rays: Results from LISA Pathfinder
Mendes, L.; Russano, G.; Nofrarias, M. +72 more
A comprehensive summary of the measurements made to characterize test-mass charging due to the space environment during the LISA Pathfinder mission is presented. Measurements of the residual charge of the test mass after release by the grabbing and positioning mechanism show that the initial charge of the test masses was negative after all release…
Constraining constant and tomographic coupled dark energy with low-redshift and high-redshift probes
Gómez-Valent, Adrià; Kilbinger, Martin; Pettorino, Valeria +1 more
We consider coupled dark energy (CDE) cosmologies, where dark matter particles feel a force stronger than gravity, due to the fifth force mediated by a scalar field which plays the role of dark energy. We perform for the first time a tomographic analysis of coupled dark energy, where the coupling strength is parametrized and constrained in differe…
Tilt-to-length coupling in LISA Pathfinder: A data analysis
Mendes, L.; Russano, G.; Sanjuan, J. +76 more
We present a study of the tilt-to-length coupling noise during the LISA Pathfinder mission and how it depended on the system's alignment. Tilt-to-length coupling noise is the unwanted coupling of angular and lateral spacecraft or test mass motion into the primary interferometric displacement readout. It was one of the major noise sources in the LI…