Ultra long lived quasinormal modes of neutron stars in $R^2$ gravity. (arXiv:2001.09117v1 [gr-qc])
<a href="http://arxiv.org/find/gr-qc/1/au:+Blazquez_Salcedo_J/0/1/0/all/0/1">Jose Luis Blázquez-Salcedo</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Khoo_F/0/1/0/all/0/1">Fech Scen Khoo</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Kunz_J/0/1/0/all/0/1">Jutta Kunz</a>
The spectrum of frequencies and characteristic times that compose the
ringdown phase of gravitational waves emitted by neutron stars carry
information about the matter content (the equation of state) and the underlying
theory of gravity. Typically, modified theories of gravity introduce additional
degrees of freedom/fields, such as scalars, which result in new families of
modes composing the ringdown spectrum. One simple but physically promising
candidate is $R^2$ gravity, which effectively introduces an additional massive
scalar field that couples non-minimally to gravity, resulting in scalarized
neutron stars. Here we show that the ringdown spectrum of $R^2$ neutron stars
is much richer and fundamentally different from the spectrum in GR, possessing
for instance ultra long lived modes that can propagate away from the star in
the form of scalar gravitational radiation.
The spectrum of frequencies and characteristic times that compose the
ringdown phase of gravitational waves emitted by neutron stars carry
information about the matter content (the equation of state) and the underlying
theory of gravity. Typically, modified theories of gravity introduce additional
degrees of freedom/fields, such as scalars, which result in new families of
modes composing the ringdown spectrum. One simple but physically promising
candidate is $R^2$ gravity, which effectively introduces an additional massive
scalar field that couples non-minimally to gravity, resulting in scalarized
neutron stars. Here we show that the ringdown spectrum of $R^2$ neutron stars
is much richer and fundamentally different from the spectrum in GR, possessing
for instance ultra long lived modes that can propagate away from the star in
the form of scalar gravitational radiation.
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