Search for Relativistic Magnetic Monopoles with Eight Years of IceCube Data

We present an all-sky 90% confidence level upper limit on the cosmic flux of relativistic magnetic monopoles using 2886 days of IceCube data. The analysis was optimized for monopole speeds between

0.750 c

and

0.995 c

, without any explicit restriction on the monopole mass. We constrain the flux of relativistic cosmic magnetic monopoles to a level below

2.0 \times 10^{- 19} {cm}^{- 2} s^{- 1} {sr}^{- 1}

over the majority of the targeted speed range. This result constitutes the most strict upper limit to date for magnetic monopoles with

β ≳ 0.8

and up to

β \sim 0.995

and fills the gap between existing limits on the cosmic flux of nonrelativistic and ultrarelativistic magnetic monopoles.

Note:

Updated to match the published version in PRL

monopole: mass
magnetic monopole
flux
IceCube
nonrelativistic
gap
Cherenkov

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