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Setting Limits on Supersymmetry Using Simplified Models
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Selection Rule for Enhanced Dark Matter Annihilation.

Anirban Das1, Basudeb Dasgupta1

  • 1Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India.

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|July 12, 2017
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Summary
This summary is machine-generated.

A new selection rule enhances dark matter annihilation signals, allowing typically suppressed p-wave annihilation to dominate. This leads to distinct relic and late-time annihilation rates with velocity-dependent signals.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astrophysics

Background:

  • Dark matter annihilation is a key process for understanding dark matter properties.
  • The Sommerfeld effect significantly modifies annihilation rates at low velocities.
  • Standard models predict velocity-suppressed p-wave annihilation.

Purpose of the Study:

  • To identify a selection rule for dark matter annihilation and coannihilation processes.
  • To investigate the impact of this rule on odd and even partial waves.
  • To explore the potential for p-wave annihilation to dominate dark matter signals.

Main Methods:

  • Application of the Sommerfeld effect to dark matter annihilation.
  • Analysis of selection rules based on exchange symmetry of identical particles.
  • Modeling of multistate dark matter with off-diagonal long-range interactions.

Main Results:

  • A selection rule is identified that enhances odd partial waves and suppresses even partial waves.
  • P-wave annihilation, typically velocity-suppressed, can become dominant.
  • Parametric differences arise between relic and late-time annihilation rates.

Conclusions:

  • The identified selection rule offers a new mechanism for dark matter annihilation.
  • Distinctive phenomenology with large, velocity-dependent annihilation rates is predicted.
  • This provides a novel observable signature for dark matter detection.