Modeling dark photon oscillations in our inhomogeneous Universe

Caputo, Andrea; Liu, Hongwan; Mishra-Sharma, Siddharth; Ruderman, Joshua T.

doi:10.1103/physrevd.102.103533

Cited by 32 publications

(29 citation statements)

References 84 publications

(172 reference statements)

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“…(4) and (6). A complete discussion and derivation of these results appear in our companion paper [33]. We have applied this framework to determine constraints from CMB photons oscillating into dark photons (Fig.…”

Section: Fig 2 (Top)mentioning

confidence: 99%

“…In our companion paper [33] we examine the physics of oscillations in detail, giving a derivation of our formalism together with a complete description of the cosmological inputs that are required to derive the limits shown here. We also validate our analytical results with simulations of γ → A 0 oscillations.…”

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confidence: 99%

“…We model the evolution of cosmological quantities using CLASS [36] interfaced with HyRec [37]. For ϵ ≪ 1, γ → A 0 conversion is a resonant process that is efficient only when the dark photon mass is equal to the plasma mass; in this limit, we can apply the Landau-Zener approximation for nonadiabatic transitions [20,33,38,39], An example photon path with conversion to a dark photon at the redshift marked "×" is shown. (Middle) A line-of-sight section through the perturbed plasma mass (solid red line), as might be encountered by a traversing CMB photon, compared to the homogeneous plasma mass (dashed red line).…”

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confidence: 99%

“…Our formalism draws from Rice's formula for the average number of level crossings of a random field [43,44]. In our companion paper [33], we derive the following differential conversion probability:…”

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confidence: 99%

“…Neglecting perturbations in the free electron fraction x e (see Ref. [33] for a discussion on why this assumption is valid here), Eq. 2 4is one of our main results, and we consider a few different possibilities for the one-point PDF Pðδ b ; tÞ in order to estimate the theoretical uncertainty associated with the nonlinear distribution of matter at low redshifts z ≲ 6.…”

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confidence: 99%

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Dark Photon Oscillations in Our Inhomogeneous Universe

et al. 2020

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A dark photon kinetically mixing with the ordinary photon represents one of the simplest viable extensions to the standard model, and would induce oscillations with observable imprints on cosmology. Oscillations are resonantly enhanced if the dark photon mass equals the ordinary photon plasma mass, which tracks the free electron number density. Previous studies have assumed a homogeneous Universe; in this Letter, we introduce for the first time an analytic formalism for treating resonant oscillations in the presence of inhomogeneities of the photon plasma mass. We apply our formalism to determine constraints from cosmic microwave background photons oscillating into dark photons, and from heating of the primordial plasma due to dark photon dark matter converting into low-energy photons. Including the effect of inhomogeneities demonstrates that prior homogeneous constraints are not conservative, and simultaneously extends current experimental limits into a vast new parameter space.

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Dark Photon Oscillations in Our Inhomogeneous Universe

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Limits on Dark Photons, Scalars, and Axion‐Electromagnetodynamics with the ORGAN Experiment

et al. 2023

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Axions are a well‐motivated dark matter candidate, with a host of experiments around the world searching for direct evidence of their existence. The ORGAN Experiment is a type of axion detector known as an axion haloscope, which takes the form of a cryogenic resonant cavity embedded in a strong magnetic field. ORGAN recently completed Phase 1a, a scan for axions ≈65 µeV, and placed the most stringent limits to date on the dark matter axion–photon coupling in this region, . It has been shown that axion haloscopes such as ORGAN are automatically sensitive to other kinds of dark matter candidates, such as dark photons, scalar field/dilaton dark matter, and exotic axion–electromagnetic couplings motivated by quantum electromagnetodynamics. The exclusion limits placed on these various dark matter candidates are computed by ORGAN 1a, and sensitivity for some future ORGAN phases are projected. In particular, the dark photon limits are the most sensitive to date in some regions of the parameter space.

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Millicharged relics reveal massless dark photons

Berlin

Dror

Gan

et al. 2023

J. High Energ. Phys.

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The detection of massless kinetically-mixed dark photons is notoriously difficult, as the effect of this mixing can be removed by a field redefinition in vacuum. In this work, we study the prospect of detecting massless dark photons in the presence of a cosmic relic directly charged under this dark electromagnetism. Such millicharged particles, in the form of dark matter or dark radiation, generate an effective dark photon mass that drives photon-to-dark photon oscillations in the early universe. We also study the prospect for such models to alleviate existing cosmological constraints on massive dark photons, enlarging the motivation for direct tests of this parameter space using precision terrestrial probes.

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Modeling dark photon oscillations in our inhomogeneous Universe

Cited by 32 publications

References 84 publications

Dark Photon Oscillations in Our Inhomogeneous Universe

Dark Photon Oscillations in Our Inhomogeneous Universe

Limits on Dark Photons, Scalars, and Axion‐Electromagnetodynamics with the ORGAN Experiment

Millicharged relics reveal massless dark photons

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