Fifth-force screening around extremely compact sources

Clare Burrage, Benjamin Elder, Peter Millington, Daniela Saadeh, Ben Thrussell

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Many non-linear scalar field theories possess a screening mechanism that can suppress any associated fifth force in dense environments. As a result, these theories can evade local experimental tests of new forces. Chameleon-like screening, which occurs because of non-linearities in the scalar potential or the coupling to matter, is well understood around extended objects. However, many experimental tests of these theories involve objects with spatial extent much smaller than the scalar field's Compton wavelength, and which could therefore be considered point-like. In this work, we determine how the fifth forces are screened in the limit that the source objects become extremely compact.

Original languageEnglish
Article number052
Number of pages34
JournalJournal of Cosmology and Astroparticle Physics
Issue number8
Publication statusPublished - 23 Aug 2021


  • dark energy theory
  • gravity
  • modified gravity
  • UKRI
  • STFC
  • ST/P000703/1


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