Search Publications
SPT clusters with DES and HST weak lensing. II. Cosmological constraints from the abundance of massive halos
Sharon, K.; Gladders, M. D.; Ade, P. A. R. +195 more
We present cosmological constraints from the abundance of galaxy clusters selected via the thermal Sunyaev-Zel'dovich (SZ) effect in South Pole Telescope (SPT) data with a simultaneous mass calibration using weak gravitational lensing data from the Dark Energy Survey (DES) and the Hubble Space Telescope (HST). The cluster sample is constructed fro…
Standard siren measurement of the Hubble constant using GW170817 and the latest observations of the electromagnetic counterpart afterglow
Palmese, A.; Margutti, R.; Hajela, A. +3 more
We present a new constraint on the Hubble constant H0 using the latest measurements of the electromagnetic counterpart to the gravitational wave (GW) event GW170817. We use the latest optical, x-ray and radio observations of the afterglow up to ∼3.5 years after the GW detection, and properly take into account the impact of the host gala…
Exploring reheated sub-40000 Kelvin neutron stars with JWST, ELT, and TMT
Raj, Nirmal; Shivanna, Prajwal; Rachh, Gaurav Niraj
Neutron stars cooling passively since their birth may be reheated in their late-stage evolution by a number of possible phenomena; rotochemical, vortex creep, crust cracking, magnetic field decay, or more exotic processes such as removal of neutrons from their Fermi seas (the nucleon Auger effect), baryon number-violating nucleon decay, and accret…
Constraints on the fuzzy dark matter mass window from high-redshift observables
Kovetz, Ely D.; Lazare, Hovav; Flitter, Jordan
We use a combination of high-redshift observables to extract the strongest constraints to date on the fraction of axion fuzzy dark matter (FDM) in the mass window
Probing a scale dependent gravitational slip with galaxy strong lensing systems
Mörtsell, Edvard; Guerrini, Sacha
Observations of galaxy-scale strong gravitational lensing systems enable unique tests of departures from general relativity at the kilo- to megaparsec scale. In this work, the gravitational slip parameter γPN, measuring the amplitude of a hypothetical fifth force, is constrained using 130 elliptical galaxy lens systems. We implement a l…
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…
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…
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…
Hubble constant from the cluster-lensed quasar system SDSS J 1004 +4112 : Investigation of the lens model dependence
Oguri, Masamune; Liu, Yuting; Cao, Shuo
As a fundamental parameter for modern cosmology, the Hubble constant H0 is experiencing a serious crisis. In this paper, we explore an independent approach to measure H0 based on the time-delay cosmography with strong gravitational lensing of a quasar by a galaxy cluster. Specifically we focus on the strong lensing system SDS…