  The in-medium behavior of bottom-strange pseudoscalar mesons in hot, isospin
asymmetric and dense hadronic environment is studied using a chiral effective
model. The same was recently generalized to the heavy quark sector and employed
to study the behavior of open-charm and open-bottom mesons. The heavy quark
(anti-quark) is treated as frozen and all medium modifications of these
bottom-strange mesons are due to their strange anti-quark (quark) content. We
observe a pronounced dependence of their medium mass on baryonic density and
strangeness content of the medium. Certain aspects of these in-medium
interactions are similar to those observed for the strange-charmed mesons in a
preceding investigation, such as the lifting of mass-degeneracy of $B_S^0$ and
${\bar B}_S^0$ mesons in hyperonic matter, while the same is respected in
vacuum as well as in nuclear matter. In general, however, there is a remarkable
distinction between the two species, even though the formalism predicts a
completely analogous in-medium interaction Lagrangian density. We discuss in
detail the reason for different in-medium behavior of these bottom-strange
mesons as compared to charmed-strange mesons, despite the dynamics of the heavy
quark being treated as frozen in both cases.
