A high-energy photon from the most powerful cosmic explosion since the Big Bang, known as GRB 221009A or "the BOAT" (Brightest Of All Time), has challenged the fundamental laws of physics. Detected on October 9, 2022, by the Carpet detector at the Baksan Observatory, this particle should have been destroyed during its journey of over two billion light-years through the cosmic microwave background (CMB) radiation field.
According to standard physics, high-energy photons interacting with the CMB are typically transformed or absorbed. The survival of this specific photon suggests a mechanism that allows it to bypass these interactions, effectively creating a "fast lane" through the universe.
Beyond Einstein's Relativity
To solve this paradox, a team led by Giorgio Galanti from the Italian National Institute for Astrophysics (INAF) has proposed a theoretical scenario that merges two previously separate concepts. The researchers suggest the photon may have transformed into axion-like particles (ALPs) during its transit, converting back into a photon upon reaching the Milky Way.
However, ALPs alone cannot explain the extreme energy of this particle. The team therefore introduced a violation of "Lorentz invariance," a cornerstone of Einstein's 1905 theory of special relativity which posits that physical laws remain the same for all observers regardless of their speed. By proposing that this invariance is violated at ultra-high energies, the researchers explain how the photon could avoid destructive interactions with fossil radiation.
Empirical Evidence and Quantum Gravity
The theory is supported by a critical timing detail: the high-energy photon arrived at Earth approximately one hour after lower-energy light particles from the same burst. This delay aligns precisely with the team's mathematical model.
Marco Roncadelli of the National Institute for Nuclear Physics (INFN) notes that if this scenario is confirmed, the universe could serve as a natural laboratory for studying quantum gravity at energy levels far exceeding anything achievable in terrestrial accelerators. The research has been accepted for publication in Physical Review Letters and is currently available on arXiv.
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