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Primordial Magnetic Fields
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Stochastic gravitational wave background (SGWB) is expected to be more
promising at this aim.
Since many years, the proposers study the generation of a SGWB signal
by a primordial magnetic
field (1) (2) (3) (4). However, this has been carried on mainly in
the spirit of using this
observable to constrain the primordial magnetic field amplitude. Now
that the era of GW astronomy and cosmology
has started, it is timely to reconsider this topic in depth, with the
aim of establishing to which level the planned
next generation of GW detectors, both Earth-based and space-based, can
constrain or detect the presence
of a primordial magnetic field. In this context, the space-based
interferometer LISA, which has been
approved by ESA and is scheduled for mission adoption in 2023, is
particularly interesting.
The frequency range of LISA spans from 10-5 to 0.1 Hz. In the early
universe, this corresponds
to processes operating around the TeV energy scale. LISA could
therefore probe the SGWB signal from
a magnetic field generated during the Electroweak Phase Transition,
which is an important candidate
among primordial magnetogenesis scenarios (c.f. discussion in (5) and references therein).
References:
(1) C. Caprini et al., JCAP 0912 (2009) 024.
(2) C. Caprini et al., JCAP 0911 (2009) 001.
(3) C. Caprini and R. Durrer, Phys.Rev. D65 (2001) 023517 .
(4) C. Caprini et al., Phys.Rev. D69 (2004) 063006.
(5) K.Subramanian, Rep.Progr.Phys. 79 (2016) 076901 .
dates of project April 1 , 2020 - March 31, 2023
Acknowledgments
Financial support of this Project was provided in part by
- ANR, France
- RSF, Russia
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