Search Publications
Magnetic-Induced Force Noise in LISA Pathfinder Free-Falling Test Masses
Mendes, L.; Russano, G.; Nofrarias, M. +76 more
LISA Pathfinder was a mission designed to test key technologies required for gravitational wave detection in space. Magnetically driven forces play a key role in the instrument sensitivity in the low-frequency regime, which corresponds to the measurement band of interest for future space-borne gravitational wave observatories. Magnetically induced…
Insights from HST into Ultramassive Galaxies and Early-Universe Cosmology
Kamionkowski, Marc; Muñoz, Julian B.; Sabti, Nashwan
The early-science observations made by the James Webb Space Telescope (JWST) have revealed an excess of ultramassive galaxy candidates that appear to challenge the standard cosmological model (Λ CDM ). Here, we argue that any modifications to Λ CDM that can produce such ultramassive galaxies in the early Universe would also affect the UV galaxy lu…
First Constraints on the Epoch of Reionization Using the Non-Gaussianity of the Kinematic Sunyaev-Zel'dovich Effect from the South Pole Telescope and Herschel-SPIRE Observations
Ade, P. A. R.; Benabed, K.; Bouchet, F. R. +123 more
We report results from an analysis aimed at detecting the trispectrum of the kinematic Sunyaev-Zel'dovich (kSZ) effect by combining data from the South Pole Telescope (SPT) and Herschel-SPIRE experiments over a
Resurrecting Hitomi for Decaying Dark Matter and Forecasting Leading Sensitivity for XRISM
Safdi, Benjamin R.; Dessert, Christopher; Rodd, Nicholas L. +1 more
The Hitomi x-ray satellite mission carried unique high-resolution spectrometers that were set to revolutionize the search for sterile neutrino dark matter (DM) by looking for narrow x-ray lines arising from DM decays. Unfortunately, the satellite was lost shortly after launch, and to date the only analysis using Hitomi for DM decay used data taken…
Search for Dark Matter Ionization on the Night Side of Jupiter with Cassini
Blanco, Carlos; Leane, Rebecca K.
We present a new search for dark matter (DM) using planetary atmospheres. We point out that annihilating DM in planets can produce ionizing radiation, which can lead to excess production of ionospheric H3+ . We apply this search strategy to the night side of Jupiter near the equator. The night side has zero solar irradiation,…
Observation of Alfvén Wave Reflection in the Solar Chromosphere: Ponderomotive Force and First Ionization Potential Effect
Stangalini, Marco; Long, David M.; Brooks, David H. +7 more
We investigate the propagation of Alfvén waves in the solar chromosphere, distinguishing between upward and downward propagating waves. We find clear evidence for the reflection of waves in the chromosphere and differences in propagation between cases with waves interpreted to be resonant or nonresonant with the overlying coronal structures. This …
Ruling Out New Physics at Low Redshift as a Solution to the H0 Tension
Shafieloo, Arman; Keeley, Ryan E.
We make the case that there can be no low-redshift solution to the H0 tension. To robustly answer this question, we use a very flexible parametrization for the dark energy equation of state such that every cosmological distance still allowed by data exists within this prior volume. To then answer whether there exists a satisfactory solu…
Weighing the Local Interstellar Medium Using Gamma Rays and Dust
Widmark, Axel; Korsmeier, Michael; Linden, Tim
Cold gas forms a significant mass fraction of the Milky Way disk, but is its most uncertain baryonic component. The density and distribution of cold gas is of critical importance for Milky Way dynamics, as well as models of stellar and galactic evolution. Previous studies have used correlations between gas and dust to obtain high-resolution measur…
Irreducible Axion Background
Rodd, Nicholas L.; Langhoff, Kevin; Outmezguine, Nadav Joseph
Searches for dark matter decaying into photons constrain its lifetime to be many orders of magnitude larger than the age of the Universe. A corollary statement is that the abundance of any particle that can decay into photons over cosmological timescales is constrained to be much smaller than the cold dark-matter density. We show that an irreducib…
No Evidence for Axions from Chandra Observation of the Magnetic White Dwarf RE J0317-853
Safdi, Benjamin R.; Dessert, Christopher; Long, Andrew J.
Axions with couplings ga γ γ∼few ×10-11 GeV-1 to electromagnetism may resolve a number of astrophysical anomalies, such as unexpected ∼TeV transparency, anomalous stellar cooling, and x-ray excesses from nearby neutron stars. We show, however, that such axions are severely constrained by the nonobservation of x ray…