Massive $Delta$-resonance admixed hypernuclear stars with anti-kaon condensations. (arXiv:2102.08787v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Thapa_V/0/1/0/all/0/1">Vivek Baruah Thapa</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sinha_M/0/1/0/all/0/1">Monika Sinha</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Li_J/0/1/0/all/0/1">Jia Jie Li</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sedrakian_A/0/1/0/all/0/1">Armen Sedrakian</a>
In this work, we study the effect of (anti)kaon condensation on the
properties of compact stars that develop hypernuclear cores with and without an
admixture of $Delta$-resonances. We work within the covariant density
functional theory with the parameters adjusted to $K$-atomic and kaon-nucleon
scattering data in the kaonic sector. The density-dependent parameters in the
hyperonic sector are adjusted to the data on $Lambda$ and $Xi^-$ hypernuclei
data. The $Delta$-resonance couplings are tuned to the data obtained from
their scattering off nuclei and heavy-ion collision experiments. We find that
(anti)kaon condensate leads to a softening of the equation of state and lower
maximum masses of compact stars than in the absence of the condensate. Both the
$K^-$ and $bar K^0$-condensations occur through a second-order phase
transition, which implies no mixed-phase formation. For large values of
(anti)kaon and $Delta$-resonance potentials in symmetric nuclear matter, we
observe that condensation leads to an extinction of $ Xi^{-,0}$ hyperons. We
also investigate the influence of inclusion of additional hidden-strangeness
$sigma^{*}$ meson in the functional and find that it leads to a substantial
softening of the equation of state and delay in the onset of (anti)kaons.
In this work, we study the effect of (anti)kaon condensation on the
properties of compact stars that develop hypernuclear cores with and without an
admixture of $Delta$-resonances. We work within the covariant density
functional theory with the parameters adjusted to $K$-atomic and kaon-nucleon
scattering data in the kaonic sector. The density-dependent parameters in the
hyperonic sector are adjusted to the data on $Lambda$ and $Xi^-$ hypernuclei
data. The $Delta$-resonance couplings are tuned to the data obtained from
their scattering off nuclei and heavy-ion collision experiments. We find that
(anti)kaon condensate leads to a softening of the equation of state and lower
maximum masses of compact stars than in the absence of the condensate. Both the
$K^-$ and $bar K^0$-condensations occur through a second-order phase
transition, which implies no mixed-phase formation. For large values of
(anti)kaon and $Delta$-resonance potentials in symmetric nuclear matter, we
observe that condensation leads to an extinction of $ Xi^{-,0}$ hyperons. We
also investigate the influence of inclusion of additional hidden-strangeness
$sigma^{*}$ meson in the functional and find that it leads to a substantial
softening of the equation of state and delay in the onset of (anti)kaons.
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