<p>We present an algebraic and kinematical analysis of non-commutative <i>κ</i>-Minkowski spaces within Galilean (non-relativistic) and Carrollian (ultra-relativistic) regimes. Utilizing the theory of Wigner-Inönu contractions, we begin with a brief review of how one can apply these contractions to the well-known Poincaré algebra, yielding the corresponding Galilean and Carrollian algebras as <i>c</i> → ∞ and <i>c</i> → 0, respectively. Subsequently, we methodically apply these contractions to non-commutative <i>κ</i>-deformed spaces, revealing compelling insights into the interplay among the non-commutative parameters <i>a</i><sup><i>μ</i></sup> (with |<i>a</i><sup><i>ν</i></sup>| being of the order of Planck length scale) and the speed of light c as it approaches both infinity and zero. Our exploration predicts a sort of “branching” of the non-commutative parameters <i>a</i><sup><i>μ</i></sup>, leading to the emergence of a novel length scale and time scale in either limit. Furthermore, our investigation extends to the examination of curved momentum spaces and their geodesic distances in appropriate subspaces of the <i>κ</i>-deformed Newtonian and Carrollian space-times. We finally delve into the study of their deformed dispersion relations, arising from these deformed geodesic distances, providing a comprehensive understanding of the nature of these space-times.</p>

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Fate of κ-Minkowski space-time in non-relativistic (Galilean) and ultra-relativistic (Carrollian) regimes

  • Deeponjit Bose,
  • Anwesha Chakraborty,
  • Biswajit Chakraborty

摘要

We present an algebraic and kinematical analysis of non-commutative κ-Minkowski spaces within Galilean (non-relativistic) and Carrollian (ultra-relativistic) regimes. Utilizing the theory of Wigner-Inönu contractions, we begin with a brief review of how one can apply these contractions to the well-known Poincaré algebra, yielding the corresponding Galilean and Carrollian algebras as c → ∞ and c → 0, respectively. Subsequently, we methodically apply these contractions to non-commutative κ-deformed spaces, revealing compelling insights into the interplay among the non-commutative parameters aμ (with |aν| being of the order of Planck length scale) and the speed of light c as it approaches both infinity and zero. Our exploration predicts a sort of “branching” of the non-commutative parameters aμ, leading to the emergence of a novel length scale and time scale in either limit. Furthermore, our investigation extends to the examination of curved momentum spaces and their geodesic distances in appropriate subspaces of the κ-deformed Newtonian and Carrollian space-times. We finally delve into the study of their deformed dispersion relations, arising from these deformed geodesic distances, providing a comprehensive understanding of the nature of these space-times.