140 citations · 1k across the 22 of their papers we have counts for
8 papers · 1 filter
Searching for coupled, hyperlight scalars across cosmic history
Masha Baryakhtar, Olivier Simon, Zachary J. Weiner
Cosmological scalar fields coupled to the Standard Model drive temporal variations in the fundamental constants that grow with redshift, positioning the early Universe as a powerfu…
Experimental targets for dark photon dark matter
David Cyncynates, Zachary J. Weiner
Ultralight dark photon dark matter features distinctive cosmological and astrophysical signatures and is also supported by a burgeoning direct-detection program searching for its k…
Detectable and defect-free dark photon dark matter
David Cyncynates, Zachary J. Weiner
Ultralight dark photons are compelling dark matter candidates, but their allowed kinetic mixing with the Standard Model photon is severely constrained by requiring that the dark ph…
Dark photon dark matter from an oscillating dilaton
Peter Adshead, Kaloian D. Lozanov, Zachary J. Weiner
We present a mechanism for generating ultralight dark photon dark matter in the early Universe via a dilatonlike scalar field coupled to the dark photon's kinetic term. Energy is i…
Nonperturbative structure in coupled axion sectors and implications for direct detection
David Cyncynates, Olivier Simon, Jedidiah O. Thompson +1
Pairs of misalignment-produced axions with nearby masses can experience a nonlinear resonance that leads to enhanced direct and astrophysical signatures of axion dark matter. In mu…
The Physics of Light Relics
Cora Dvorkin, Joel Meyers, Peter Adshead +19
Many well-motivated extensions of the Standard Model predict the existence of new light species that may have been produced in the early universe. Prominent examples include axions…
Stochastic evolution of scalar fields with continuous symmetries during inflation
Peter Adshead, Lauren Pearce, Jessie Shelton +1
During inflation, scalar fields with masses less than the Hubble scale acquire vacuum expectation values (vevs) via stochastic processes driven by quantum fluctuations. For nearly…
Non-Abelian gauge preheating
Peter Adshead, John T. Giblin, Zachary J. Weiner
We study preheating in models where a scalar inflaton is directly coupled to a non-Abelian gauge field. In particular, we examine inflation with a conformal, dila…