Tootfinder

Stability of non-supersymmetric vacua from calibrations
Vincent Menet, Alessandro Tomasiello
https://arxiv.org/abs/2507.02787 https://

Stability of non-supersymmetric vacua from calibrations
Supersymmetric vacua are protected from vacuum decay by energy positivity. No such argument is known for any non-supersymmetric vacua. In this paper, we try to extend to the latter a simpler argument based on calibrations, to at least protect them from decays mediated by D-brane bubbles, including their abelian bound states. We examine several classes of AdS$_4$ and AdS$_5$ solutions in type II string theory, including some new ones, involving coset spaces, sphere fibrations, Kähler--Einstein …

Gravitational waves from a dilaton-induced, first-order QCD phase transition
Aleksandr Chatrchyan, M. C. David Marsh, Charalampos Nikolis
https://arxiv.org/abs/2507.01191

Gravitational waves from a dilaton-induced, first-order QCD phase transition
We show that a `QCD dilaton' field, whose vacuum expectation value sets the strong coupling, can render the Quantum Chromodynamic (QCD) confinement transition first-order. The QCD dilaton is cosmologically attracted to a false vacuum at weak coupling in the early universe. Quantum tunnelling towards the true vacuum triggers prompt chiral symmetry breaking and confinement of QCD, leading to detonating bubbles of the hadronic phase. We find that plasma sound waves produced by this dilaton-induced…

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