644 citations · 5.3k across the 76 of their papers we have counts for
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Production of Axions by Cosmic Magnetic Helicity
L. Campanelli, M. Giannotti
We investigate the effects of an external magnetic helicity production on the evolution of the cosmic axion field. It is shown that a helicity larger than (few \times 10^{-15} G)^2…
A Note on the Cosmic Evolution of the Axion in a Strong Magnetic Field
L. Campanelli, M. Giannotti
It has been pointed out in the literature that in the presence of an external magnetic field the axion mass receives an electromagnetic contribution. We show that if a magnetic fie…
Magnetic Helicity Generation from the Cosmic Axion Field
L. Campanelli, M. Giannotti
The coupling between a primordial magnetic field and the cosmic axion field generates a helical component of the magnetic field around the time in which the axion starts to oscilla…
Nucleon-Nucleon Bremsstrahlung emission of massive Axion
M. Giannotti, F. Nesti
We consider the problem of axion production by bremsstrahlung emission in a nuclear medium. The usual assumption of a massless axion is replaced by more general hypotheses, so that…
The response of primordial abundances to a general modification of and/or of the early universe expansion rate
C. Bambi, M. Giannotti, F. L. Villante
We discuss the effects of a possible time variation of the Newton constant on light elements production in Big Bang Nucleosyntesis (BBN). We provide analytical estimate…