Doubly Special Relativity

TL;DR

Doubly Special Relativity introduces a framework where two observer-independent scales, velocity and length/momentum, modify relativistic transformations, with implications for resolving the cosmic-ray paradox.

Contribution

The paper provides a concise review of recent developments in Doubly Special Relativity, highlighting its potential to address high-energy astrophysical anomalies.

Findings

Doubly Special Relativity incorporates a second invariant scale into Lorentz transformations.

It offers a possible solution to the cosmic-ray paradox.

The framework modifies standard relativistic kinematics at Planck-scale energies.

Abstract

I give a short non-technical review of the results obtained in recent work on "Doubly Special Relativity", the relativistic theories in which the rotation/boost transformations between inertial observers are characterized by two observer-independent scales (the familiar velocity scale, $c$, and a new observer-independent length/momentum scale, naturally identified with the Planck length/momentum). I emphasize the aspects relevant for the search of a solution to the cosmic-ray paradox.