News by Levels · Level 3 · Student worksheet

ORCA Constrains Possible Violations of Lorentz Symmetry

In this lesson: Apply the physical principle and distinguish publication timing from the experimental setup.

Name: __________________________ Date: __________________

Read the story

The KM3NeT collaboration tested Lorentz invariance using atmospheric neutrinos recorded by six ORCA detection units. This principle requires consistent physical laws for observers moving at constant velocities relative to one another.

An analysis of 1.4 years of data found no significant violation. It established upper limits on selected effects rather than proving that every possible violation is absent.

The preprint appeared in March; November 4 coverage reported its journal publication. The measurements came from an early detector configuration. More observations and additional units could improve sensitivity.

Source: SISSA Medialab; research by KM3NeT (https://arxiv.org/abs/2603.04264), adapted under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), 2026-11-04. https://phys.org/news/2026-11-einstein-laws-bottom-mediterranean-sea.html

Read and practise

1. Which conclusion follows from the analysis?

   1. All conceivable violations have been disproved.
   2. Selected effects now have upper limits, but not every violation is ruled out.
   3. A significant violation was measured.

2. Two observers move at different constant velocities relative to each other. What does the principle require?

   1. They must measure identical particle energies and arrival directions.
   2. The physical laws must remain consistent for both observers.
   3. The physical laws must change whenever their relative velocity differs.

Your turn

A reader says the November 4 coverage means the measurements came from a newly completed detector. Use the publication timeline and detector details to assess that claim.

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Read online: https://newsbylevels.com/news/orca-neutrino-lorentz-limits-november-2026/level-3/