Kavli Affiliate: Jia Liu
| First 5 Authors: Haipeng An, Shuailiang Ge, Jia Liu, Mingzhe Liu,
| Summary:
Dark photon dark matter (DPDM) emerges as a compelling candidate for
ultralight bosonic dark matter, detectable through resonant conversion into
photons within a plasma environment. This study employs in-situ measurements
from the Parker Solar Probe (PSP), the first spacecraft to venture into the
solar corona, to probe for DPDM signatures. The PSP in-situ measurements go
beyond the traditional radio window, spanning frequencies between about 10 kHz
and 20 MHz, a challenging range inaccessible to Earth-based radio astronomy.
Additionally, the proximity of PSP to the resonant conversion location enhances
the signal flux, providing a distinct advantage over ground-based observations.
As a result, the PSP data establishes the most stringent constraints on the
kinetic mixing parameter $epsilon$ for DPDM frequencies between 70 kHz and 20
MHz, with values of $epsilon lesssim 10^{-14}-10^{-13}$. Investigating the
data from STEREO satellites resulted in weaker constraints compared to those
obtained from PSP. By utilizing state-of-the-art solar observations from space,
we have surpassed the cosmic microwave background limits derived from
early-universe observations.
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