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New bounds on axionlike particles from the Fermi Large Area Telescope observation of PKS <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2155</mml:mn><mml:mo>โ</mml:mo><mml:mn>304</mml:mn></mml:mrow></mml:math>
The axionlike particle (ALP)-photon mixing in the magnetic field around $\ensuremath{\gamma}$-ray sources or along the line of sight could induce oscillation between photons and ALPs, which then causes irregularities in the $\ensuremath{\gamma}$-ray spectra. In this work we search for such spectral irregularities in the spectrum of PKS $2155\ensuremath{-}304$ using 8.6 โฆ