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Nonminimal global monopoles and bound orbits

Nucamendi1, Salgado, Sudarsky

  • 1Departamento de Fisica, Centro de Investigacion y de Estudios Avanzados del I.P.N., Apartado Postal 14-741, Mexico, D.F. 07000, Mexico and and Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico, Apartado Postal.

Physical Review Letters
|October 6, 2000
PubMed
Summary

Global monopoles coupled nonminimally to gravity create attractive regions for bound stellar orbits. This contrasts with minimal coupling and affects observed "rotation curves" due to frequency shifts.

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Area of Science:

  • Theoretical physics
  • General relativity
  • Cosmology

Background:

  • Global monopoles are hypothetical topological defects in spacetime.
  • Their gravitational effects are typically studied under minimal coupling to gravity.
  • Nonminimal coupling introduces additional interactions between the monopole and the gravitational field.

Purpose of the Study:

  • To investigate the gravitational field of a global monopole with nonminimal coupling to gravity.
  • To determine if bound orbits for stars exist in such spacetimes.
  • To analyze the associated frequency shifts and their implications for observable phenomena.

Main Methods:

  • Numerical analysis of the spacetime geometry around a nonminimally coupled global monopole.
  • Calculation of orbital dynamics for stars in circular orbits.

Related Experiment Videos

  • Modeling of frequency shifts for observed "rotation curves".

    • Main Results:

    • Existence of an attractive region for bound orbits with specific nonminimal couplings.
    • Contrast with the minimal coupling case where such regions may not exist.
    • Demonstration of frequency shift behavior related to stellar rotation curves.

    Conclusions:

    • Nonminimal coupling significantly alters the gravitational influence of global monopoles.
    • Bound orbits and observable effects like frequency shifts are possible under specific nonminimal coupling scenarios.
    • This research provides a theoretical framework for interpreting astronomical observations related to exotic compact objects.