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Article
Open AccessS-matrix positivity without Lorentz invariance: a case study
We investigate the analytic structure of scattering amplitudes in theories in which Lorentz invariance is spontaneously broken. We do so by computing and studying the S-matrix for a simple example: a superflui...
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Article
Open AccessApparently superluminal superfluids
We consider the superfluid phase of a specific renormalizable relativistic quantum field theory. We prove that, within the regime of validity of perturbation theory and of the superfluid effective theory, ther...
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Article
Open AccessA technical analog of the cosmological constant problem and a solution thereof
The near vanishing of the cosmological constant is one of the most puzzling open problems in theoretical physics. We consider a system, the so-called framid, that features a technically similar problem. Its st...
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Chapter and Conference Paper
Social Media During the COVID-19 Era in 5* Hotels in Attica, Greece
The rapid proliferation of coronavirus put public health in danger, and affected the global economy, while making the tourism industry suffer its worst recession. The imposition of strict restrictions on citiz...
