Physical and Cosmological Implications of a Possible Class of Particles Able to Travel Faster than Light

TL;DR

This paper explores the theoretical and cosmological implications of hypothetical particles that can travel faster than light, assuming Lorentz invariance is only approximate and such particles have higher critical speeds than c.

Contribution

It introduces the concept of superluminal sectors with higher critical speeds and discusses their potential physical and cosmological consequences.

Findings

Superluminal sectors could exist with different Minkowskian space-times.

Such particles would not be tachyons but could behave like ordinary particles kinematically.

Implications include possible new physics beyond current experimental detection.

Abstract

If Lorentz invariance is only an approximate property of equations describing a sector of matter above some critical distance scale, the speed of light c will not necessarily be the only critical speed in vacuum. Superluminal sectors of matter may exist related to new degrees of freedom not yet discovered experimentally. The new particles would not be tachyons: they may feel different minkowskian space-times with critical speeds much higher than c and behave kinematically like ordinary particles apart from the difference in critical speed. We present a discussion of possible physical (theoretical and experimental) and cosmological implications of such a scenario, assuming that the superluminal sectors couple weakly to ordinary matter.