Making light of gravitational-waves. (arXiv:1904.12678v5 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Tarrant_J/0/1/0/all/0/1">Justine Tarrant</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Beck_G/0/1/0/all/0/1">Geoff Beck</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Colafrancesco_S/0/1/0/all/0/1">Sergio Colafrancesco</a>
Mixing between photons and low-mass bosons is well considered in the
literature. The particular case of interest here is with hypothetical
gravitons, as we are concerned with the direct conversion of gravitons into
photons in the presence of an external magnetic field. We examine whether such
a process could produce direct low-frequency radio counterparts to
gravitational-wave events. Our work differs from previous work in the
literature in that we use the results of numerical simulations to demonstrate
that, although a single such event may be undetectable without at least $10^5$
dipoles, an unresolved gravitational wave background from neutron star mergers
could be potentially detectable with a lunar telescope of $10^2$ elements. This
is provided the gravitational wave spectrum only experiences exponential
damping above 80 kHz, a full order of magnitude above the limit achieved by
present simulation results. This does not make detection impossible, but
suggests it will be challenging. Furthermore, with this scenario we show that,
for the case when no detection is made by a lunar array, a lower bound,
competitive with those from Lorentz-invariance violation, may be placed on the
energy-scale of quantum gravitational effects. The SKA is shown to have very
limited prospects for the detection of either a single merger or a background.
Mixing between photons and low-mass bosons is well considered in the
literature. The particular case of interest here is with hypothetical
gravitons, as we are concerned with the direct conversion of gravitons into
photons in the presence of an external magnetic field. We examine whether such
a process could produce direct low-frequency radio counterparts to
gravitational-wave events. Our work differs from previous work in the
literature in that we use the results of numerical simulations to demonstrate
that, although a single such event may be undetectable without at least $10^5$
dipoles, an unresolved gravitational wave background from neutron star mergers
could be potentially detectable with a lunar telescope of $10^2$ elements. This
is provided the gravitational wave spectrum only experiences exponential
damping above 80 kHz, a full order of magnitude above the limit achieved by
present simulation results. This does not make detection impossible, but
suggests it will be challenging. Furthermore, with this scenario we show that,
for the case when no detection is made by a lunar array, a lower bound,
competitive with those from Lorentz-invariance violation, may be placed on the
energy-scale of quantum gravitational effects. The SKA is shown to have very
limited prospects for the detection of either a single merger or a background.
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