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Cosmological and astrophysical probes of dark baryons
David McKeen, Maxim Pospelov, Nirmal Raj
We examine the cosmological and astrophysical signatures of a "dark baryon," a neutral fermion that mixes with the neutron. As the mixing is through a higher-dimensional operator a…
Earth-bound Milli-charge Relics
Maxim Pospelov, Harikrishnan Ramani
Dark sector particles with small electric charge, or millicharge, (mCPs) may lead to a variety of diverse phenomena in particle physics, astrophysics and cosmology. Assuming their…
Novel multi-lepton signatures of dark sectors in light meson decays
Matheus Hostert, Maxim Pospelov
We point out kaon decays to multiple charged leptons as a novel probe of light dark particles . Previously neglected channels, such as …
The Search for Feebly-Interacting Particles
Gaia Lanfranchi, Maxim Pospelov, Philip Schuster
At the dawn of a new decade, particle physics faces the challenge of explaining the mystery of dark matter, the origin of matter over antimatter in the Universe, the apparent fine-…
Millicharged Cosmic Rays and Low Recoil Detectors
Roni Harnik, Ryan Plestid, Maxim Pospelov +1
We consider the production of a "fast flux" of hypothetical millicharged particles (mCPs) in the interstellar medium (ISM). We consider two possible sources induced by cosmic rays:…
A Precise Photometric Ratio via Laser Excitation of the Sodium Layer II: Two-photon Excitation Using Lasers Detuned from 589.16 nm and 819.71 nm Resonances
J. Albert, D. Budker, K. Chance +5
This article is the second in a pair of articles on the topic of the generation of a two-color artificial star (which we term a "laser photometric ratio star," or LPRS) of de-excit…