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Physics Case for WISP Searches .

Physics Case for WISP Searches. Towards a comprehensive summary. Summary of Physics Case. Very Weakly Interacting Slim Particles (WISPs) are strongly motivated from theory , cosmology , and astrophysics Theory : Axions Axion-Like P articles (ALPs) hidden sector U(1)s (HPs)

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Physics Case for WISP Searches .

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  1. Physics Case for WISP Searches. Towards a comprehensive summary

  2. Summary of Physics Case • VeryWeaklyInteracting Slim Particles (WISPs) arestronglymotivatedfromtheory, cosmology, andastrophysics • Theory: • Axions • Axion-LikeParticles (ALPs) • hiddensector U(1)s (HPs) • Cosmology: • Axion, ALP, or HP Cold Dark Matter (CDM) • Extra, darkradiationduring CMB decoupling • Astrophysics: • Photon ALP oscillationsasexplanationofanomaloustransparencyoftheuniverseforTeVgammarays • Axionor ALP bremsstrahlungasexplanationof non-standard energylossofwhitedwarfs • ALPS II cansearchforthem in stronglymotivatedparameterregion

  3. WISPy Cold Dark Matter • Axions, ALPs and HPs can be born in the early universe non-thermally in the form of spatially homogeneous classical field oscillations (misalignment mechanism) • If sufficiently weakly coupled, this CDM component survives until today • Arias, Cadamuro, Goodsell, Jaeckel, Redondo, AR, in prep.

  4. WISPy Cold Dark Matter • ALPS II 2012 will reachtheparameterrangeofinterestfor HP CDM:

  5. WISPy Cold Dark Matter • ALPS II 2017 will reach the parameter range of interest for ALP CDM:

  6. HP Dark Radiation • Global fit to CMB angular power spectrum slightly prefers extra dark radiation beyond three light neutrinos:

  7. HP Dark Radiation • Global fit to CMB angular power spectrum slightly prefers extra dark radiation beyond three light neutrinos:

  8. HP Dark Radiation • FormeVscalemasses, photon -> HP conversionsoccurresonantly after BBN, but before CMB decoupling -> HP darkradiation • Jaeckel, Redondo, AR • ALPS II 2012 canprobe HP explanationof extra darkradiation:

  9. Light Shining through Cosmic Walls • Spectraofdistant VHE gamma-raysourcesshowno strong indicationsofabsorptionfeatures due to pair productionprocessesfromscattering off photonbath in intergalacticspace (ExtragalacticBackground Light) • Horns, Meyer, subm. to JCAP

  10. Light Shining through Cosmic Walls • Photon -> ALP conversions in cosmic magnetic fields may explain this observation, for ALP masses below neV and g ~ 10e-11/GeV • De Angelis, Roncadelli, Mansutti; …; Simet, Hooper, Serpico; …; Hochmuth, Sigl; …;Mirizzi, Montanino • M • Meyer

  11. Light Shining through Cosmic Walls • Photon -> ALP conversions in cosmic magnetic fields may explain this observation, for ALP masses below neV and g ~ 10e-11/GeV • De Angelis, Roncadelli, Mansutti; …; Simet, Hooper, Serpico; …; Hochmuth, Sigl; …;Mirizzi, Montanino • Meyer

  12. Non-Standard Energy Loss in White Dwarfs • Standard model does not fit to white dwarf luminosity function • Extra energy loss compatible with axion or ALP bremsstrahlung (mass below keV, decay constant ~ 1e9 GeV -> g ~ 1e-11/GeV) • Isern et al.

  13. Physics Reach of ALPS II 2017 • ALPS II 2017 will reach the parameter range of interest for VHE light shining through the EBL and WD energy loss (g ~ 10e-11/GeV ):

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