Timing the r-Process Enrichment of the Ultra-Faint Dwarf Galaxy Reticulum II

Kavli Affiliate: Alexander P. Ji | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: The ultra-faint dwarf galaxy Reticulum II (Ret II) exhibits a unique chemical evolution history, with 72 +10/-12% of its stars strongly enhanced in r-process elements. We present deep Hubble Space Telescope photometry of Ret II and analyze its star […]


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Distant Echoes of the Milky Way’s Last Major Merger

Kavli Affiliate: Alexander P. Ji | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: The majority of the Milky Way’s stellar halo consists of debris from our Galaxy’s last major merger, the Gaia-Sausage-Enceladus (GSE). In the past few years, stars from GSE have been kinematically and chemically studied in the inner $30$ kpc […]


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New Searches for Muonphilic Particles at Proton Beam Dump Spectrometers

Kavli Affiliate: Gordan Krnjaic | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: We introduce a new search strategy for visibly decaying muonphilic particles using a proton beam spectrometer modeled after the SpinQuest experiment at Fermilab. In this setup, a ${sim}$100 GeV primary proton beam impinges on a thick fixed target and yields […]


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Completely Dark Matter from Rapid-Turn Multifield Inflation

Kavli Affiliate: Edward W. Kolb | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: We study cosmological gravitational particle production as applied to "rapid-turn" models of inflation involving two scalar fields. We are interested in the production of massive spin-0 particles that only interact gravitationally and provide a candidate for the dark matter. […]


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Ganymede MHD Model: Magnetospheric Context for Juno’s PJ34 Flyby

Kavli Affiliate: George Clark | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: On June 7th, 2021 the Juno spacecraft visited Ganymede and provided the first in situ observations since Galileo’s last flyby in 2000. The measurements obtained along a one-dimensional trajectory can be brought into global context with the help of three-dimensional […]


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Threshold of Primordial Black Hole Formation against Velocity Dispersion in Matter-Dominated Era

Kavli Affiliate: Misao Sasaki | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: We study the effects of velocity dispersion on the formation of primordial black holes~(PBHs) in a matter-dominated era. The velocity dispersion is generated through the nonlinear growth of perturbations and has the potential to impede the gravitational collapse and thereby […]


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Logarithmic Duality of the Curvature Perturbation

Kavli Affiliate: Misao Sasaki | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: We study the comoving curvature perturbation $mathcal{R}$ in general single-field inflation models whose potential can be approximated by a piecewise quadratic potential $V(varphi)$ by using the $delta N$ formalism. We find a general formula for $mathcal{R}(deltavarphi)$, which consists of a […]


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X-ray Polarization Observations of BL Lacertae

Kavli Affiliate: Herman L. Marshall | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: Blazars are a class of jet-dominated active galactic nuclei with a typical double-humped spectral energy distribution. It is of common consensus the Synchrotron emission to be responsible for the low frequency peak, while the origin of the high frequency […]


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An Hα Impression of Lyα Galaxies at $zsimeq6$ with Deep JWST/NIRCam Imaging

Kavli Affiliate: Linhua Jiang | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: We present a study of seven spectroscopically confirmed Ly{alpha} emitting galaxies at redshift $zsimeq6$ using the James Webb Space Telescope (JWST) NIRCam images. These galaxies, with a wide range of Ly{alpha} luminosities, were recently observed in a series of NIRCam […]


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One-loop tensor power spectrum from an excited scalar field during inflation

Kavli Affiliate: Misao Sasaki | First 5 Authors: [#item_custom_name[1]], [#item_custom_name[2]], [#item_custom_name[3]], [#item_custom_name[4]], [#item_custom_name[5]] | Summary: We present a consistent one-loop calculation for the inflationary tensor power spectrum in the presence of an excited spectator scalar field using the in-in formalism. We find that the super-horizon primordial power spectrum of the tensor mode can be scale-invariantly […]


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