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Coupling gravitons to matter.

Z Bern1, A De Freitas, H L Wong

  • 1Department of Physics and Astronomy, The University of California at Los Angeles, Los Angeles, California 90095-1547, USA.

Physical Review Letters
|October 6, 2000
PubMed
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We developed a new method to construct scattering amplitudes for gravitons interacting with matter by relating them to gauge theory amplitudes. This approach simplifies calculations for various particle interactions, including those with massive gravitons.

Area of Science:

  • High-energy physics
  • String theory
  • Quantum gravity

Background:

  • Graviton interactions are crucial for understanding quantum gravity.
  • Calculating scattering amplitudes for gravitons is complex.
  • Gauge theories offer a potential framework for simplification.

Purpose of the Study:

  • To construct tree-level scattering amplitudes for gravitons coupled to matter.
  • To express these amplitudes in terms of gauge theory partial amplitudes.
  • To explore unconventional decompositions of color and kinematics.

Main Methods:

  • Utilizing relationships between open and closed strings.
  • Developing a construction based on gauge theory partial amplitudes.
  • Representing gauge charges with dynamical scalars or fermions.

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Main Results:

  • Presented a construction for graviton-matter scattering amplitudes.
  • Provided examples for gravitons coupled to vector bosons or fermion pairs.
  • Included cases with massive graviton exchange, relevant for large compact dimensions.

Conclusions:

  • The proposed method offers a novel way to compute graviton scattering amplitudes.
  • This construction simplifies calculations by leveraging gauge theory techniques.
  • The framework accommodates massive graviton scenarios and provides new insights into color-kinematic decompositions.