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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
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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.

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.