Marcos Flores

• Flores, Marcos & Petraki, Kalliopi (2026). Unitarizing non-relativistic scattering. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(6). doi: 10.1007/jhep06(2026)148. Fulltekst i vitenarkiv Vis sammendrag

  A bstract Unitarity imposes coupled constraints on elastic and inelastic amplitudes. Satisfying them requires resummation of the self-energy contributions from both elastic and inelastic channels. Inelastic channels generate anti-Hermitian contributions that can be consistently deduced from the unitarity relation underlying the optical theorem, leading to non-local separable potentials and a compact, unique and complete unitarization scheme in the non-relativistic regime. We present two alternative derivations of the anti-Hermitian kernel, from the continuity equation combined with LSZ reduction, and by integrating out inelastic channels. We further extend the unitarization framework to treat non-analytic and non-convergent behavior of inelastic amplitudes in the complex momentum plane and to incorporate bound states. For non-convergent amplitudes, we demonstrate two renormalization procedures in which anti-Hermitian separable potentials necessarily induce Hermitian separable counterterms, yielding finite cross-sections consistent with unitarity. These results provide a general tool for non-relativistic scattering, with clear applications to dark-matter phenomenology.

• Flores, Marcos & Petraki, Kalliopi (2026). Unitarity violation and restoration in radiative bound-state formation. Journal of High Energy Physics (JHEP). ISSN 1126-6708. 2026(6). doi: 10.1007/jhep06(2026)231. Fulltekst i vitenarkiv Vis sammendrag

  A bstract State-of-the-art calculations motivated by dark matter exhibit severe violation of partial-wave unitarity in the non-relativistic regime in radiative bound-state-formation processes. It has been recently shown, in a model-independent fashion, that unitarity is restored by the proper resummation of the inelastic contributions to the self-energy of the incoming state. In this work, we first derive Kramers-like formulae for individual partial waves, demonstrating that existing calculations of bound-state formation severely violate unitarity. We then discuss how unitarity is restored through the resummation of the absorptive contributions to the incoming-state self-energy, generated by bound-state formation processes, taking into account their analytic structure in the complex momentum plane. Our results can be generalized to a variety of theories and employed in phenomenological studies, such as dark-matter freeze-out, indirect detection and self-interactions.

Se alle arbeider i NVA

• Flores, Marcos (2026). Unitarity in the non-relativistic regime and implications for dark matter. doi: https:/indico.capa.unizar.es/event/40/contributions/877/. Fulltekst i vitenarkiv Vis sammendrag

  Unitarity imposes strict bounds on elastic and inelastic partial-wave cross sections. However, state-of-the-art calculations, motivated by dark-matter phenomenology, can exhibit substantial violations of partial-wave unitarity, with potentially significant consequences for phenomenological predictions. In this talk, I present a new, model-independent formalism that restores unitarity through the consistent resummation of inelastic contributions to the self-energy of the incoming state. This framework provides a systematic and internally consistent treatment of inelastic effects. I will illustrate its implementation in existing bound-state-formation calculations, demonstrating how unitarity is recovered in regimes where existing calculations break down. The method is broadly applicable and has implications for dark-matter freeze-out, indirect detection, and self-interactions.

• Flores, Marcos (2026). Unitarity in the non-relativistic regime and implications for dark matter. doi: https:/indico2.uis.no/event/64/contributions/2001/. Fulltekst i vitenarkiv Vis sammendrag

  Unitarity imposes strict bounds on elastic and inelastic partial-wave cross sections. However, state-of-the-art calculations, motivated by dark-matter phenomenology, may exhibit substantial violations of partial-wave unitarity, with potentially significant consequences for phenomenological predictions. In this talk, I present a new, model-independent formalism that restores unitarity through the consistent resummation of inelastic contributions to the self-energy of the incoming state. This framework provides a systematic and internally consistent treatment of inelastic effects. I will illustrate its implementation in existing bound-state-formation calculations, demonstrating how unitarity is recovered in regimes where existing calculations break down. The method is broadly applicable and has implications for dark-matter freeze-out, indirect detection, and self-interactions.

• Flores, Marcos (2026). Unitarity in the non-relativistic regime and implications for dark matter. Fulltekst i vitenarkiv Vis sammendrag

  Unitarity imposes strict bounds on elastic and inelastic partial-wave cross sections. However, state- of-the-art calculations, motivated by dark-matter phenomenology, may exhibit substantial viola- tions of partial-wave unitarity, with potentially significant consequences for phenomenological predictions. In this talk, I present a new, model-independent formalism that restores unitarity through the consistent resummation of inelastic contributions to the self-energy of the incoming state. This framework provides a systematic and internally consistent treatment of inelastic effects. I will illustrate its implementation in existing bound-state-formation calculations, demonstrating how unitarity is recovered in regimes where existing calculations break down. The method is broadly applicable and has implications for dark-matter freeze-out, indirect detection, and self-interactions.

Se alle arbeider i NVA