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Millicharged dark matter in quantum gravity and string theory.

Gary Shiu1, Pablo Soler1, Fang Ye1

  • 1Department of Physics, University of Wisconsin, 1150 University Avenue, Madison, Wisconsin 53706, USA and Department of Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

Physical Review Letters
|August 29, 2014
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Summary
This summary is machine-generated.

This study explores millicharged dark matter within string theory, reconciling small electric charges with quantum gravity. We demonstrate that these charges arise from kinetic mixing involving massless gauge bosons, not irrational charges.

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Area of Science:

  • Theoretical Physics
  • String Theory
  • Cosmology

Background:

  • The millicharged dark matter scenario proposes dark matter particles with small electric charges.
  • Quantum gravity folk theorems generally forbid irrational charges in theories with a single massless gauge field.
  • String theory compactifications can introduce extra U(1) gauge bosons, potentially leading to particle mixings.

Purpose of the Study:

  • To investigate the theoretical underpinnings of millicharged dark matter within string theory.
  • To resolve the apparent contradiction between millicharged dark matter and quantum gravity folk theorems.
  • To elucidate the mechanism by which small electric charges arise in dark matter candidates.

Main Methods:

  • Analysis of the U(1) mass matrix structure in type II string compactifications.
  • Examination of kinetic and mass mixing effects between photons and extra U(1) bosons.
  • Application of string theory principles to particle physics scenarios.

Main Results:

  • Millicharges in dark matter arise exclusively through kinetic mixing.
  • The existence of at least two exactly massless gauge bosons is required for millicharges.
  • Continuous parameters in the theory determine the magnitude of these small electric charges.

Conclusions:

  • The millicharged dark matter scenario is consistent with string theory.
  • Kinetic mixing provides a viable mechanism for generating millicharges.
  • The presence of multiple massless gauge bosons is a key feature for this scenario.