Reconciling the CAST and PVLAS results

R. N. Mohapatra, Salah Nasri

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)


The PVLAS experiment has recently claimed evidence for an axionlike particle in the milli-electron-volt mass range with a coupling to two photons that appears to be in contradiction with the negative results of the CAST experiment searching for solar axions. The simple axion interpretation of these two experimental results is therefore untenable and it has posed a challenge for theory. We propose a possible way to reconcile these two results by postulating the existence of an ultralight pseudoscalar particle interacting with two photons and a scalar boson and the existence of a low scale phase transition in the theory.

Original languageEnglish
Article number050402
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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