Zobrazeno 1 - 10
of 110
pro vyhledávání: '"Weiner, Zachary"'
Autor:
Cyncynates, David, Weiner, Zachary J.
Ultralight dark photon dark matter features distinctive cosmological and astrophysical signatures and is also supported by a burgeoning direct-detection program searching for its kinetic mixing with the ordinary photon over a wide mass range. Dark ph
Externí odkaz:
http://arxiv.org/abs/2410.14774
Autor:
Loverde, Marilena, Weiner, Zachary J.
Cosmological data probe massive neutrinos via their effects on the geometry of the Universe and the growth of structure, both of which are degenerate with the late-time expansion history. We clarify the nature of these degeneracies and the individual
Externí odkaz:
http://arxiv.org/abs/2410.00090
The fundamental constants at recombination can differ from their present-day values due to degeneracies in cosmological parameters, raising the possibility of yet-undiscovered physics coupled directly to the Standard Model. We study the cosmology of
Externí odkaz:
http://arxiv.org/abs/2405.10358
We study gauge preheating following pseudoscalar-driven inflation in full general relativity. We implement the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) scheme to solve the full nonlinear evolution of the metric alongside the dynamics of the pseudosc
Externí odkaz:
http://arxiv.org/abs/2311.01504
Autor:
Cyncynates, David, Weiner, Zachary J.
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 photons do not collapse into a cosmic string network in the early Univer
Externí odkaz:
http://arxiv.org/abs/2310.18397
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 initially stored in the condensate of the dilaton, which resonantly pro
Externí odkaz:
http://arxiv.org/abs/2301.07718
Autor:
Loverde, Marilena, Weiner, Zachary J.
After their generation, cosmological backgrounds of gravitational waves propagate nearly freely but for the expansion of the Universe and the anisotropic stress of free-streaming particles. Primordial signals -- both that from inflation and the infra
Externí odkaz:
http://arxiv.org/abs/2208.11714
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 much of the relevant parameter space, self-interactions cause axion fluc
Externí odkaz:
http://arxiv.org/abs/2208.05501
Autor:
Dvorkin, Cora, Meyers, Joel, Adshead, Peter, Amin, Mustafa, Argüelles, Carlos A., Brinckmann, Thejs, Castorina, Emanuele, Cohen, Timothy, Craig, Nathaniel, Curtin, David, Cyr-Racine, Francis-Yan, Du, Peizhi, Knox, Lloyd, Li, Bohua, Loverde, Marilena, Lozanov, Kaloian, Muñoz, Julian B., Schutz, Katelin, Shapiro, Paul, Wallisch, Benjamin, Weiner, Zachary J., Xu, Weishuang Linda
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, sterile neutrinos, gravitinos, dark photons, and more. The gravitati
Externí odkaz:
http://arxiv.org/abs/2203.07943
Scalar metric fluctuations generically source a spectrum of gravitational waves at second order in perturbation theory, poising gravitational wave experiments as potentially powerful probes of the small-scale curvature power spectrum. We perform a de
Externí odkaz:
http://arxiv.org/abs/2105.01659