Titlebook: Instabilities in Field Theory; A Primer with Applic Adrià Delhom,Alejandro Jiménez Cano,Francisco José Book 2023 The Editor(s) (if applicab

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Adrià Delhom,Alejandro Jiménez Cano,Francisco José Maldonado Torralbaging uncertainty with advanced production control concepts aCommercial advanced planning and scheduling (APS) systems have been around for about 25 years and have seen widespread adoption in a variety of companies. The promises made by APS system implementations are high, and at the same time, APS p

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ies. The promises made by APS system implementations are high, and at the same time, APS projects are complex, costly, and carry a significant risk of failure. There is a great need for guidance on how to successfully implement APS systems, which is why this book was written. .In this book, we aim t

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Introduction to Instabilities and Some Relevant Examples,lities are defined within them. We will then go over examples of instabilities that are typically encountered in the literature, emphasizing their physical meaning. We will finally discuss how to interpret these instabilities within the effective field theory framework.

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Ostrogradski Theorem and Ghosts,ormalism that treats point particle classical mechanics and field theories on an equal footing. To understand the theorem, we will see how to define a Hamiltonian for higher-order theories, and how these are always unbounded in phase space, concretely in the direction where the momenta associated to

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Examples of Instabilities in Gravity Theories,In the third chapter, we will briefly present general results on the appearance of instabilities in modified gravity. We will use the techniques developed in the previous chapters to unveil the presence of instabilities and discuss how to avoid them.