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- W4310514429 abstract "We consider a family of non-linear theories of electromagnetism that interpolate between Born-Infeld at small distances and ModMax at large distances. These models are duality invariant and feature a $K-$mouflage screening in the Born-Infeld regime. We focus on computing the static perturbations around a point-like screened charge in terms of two decoupled scalar potentials describing the polar and the axial sectors respectively. Duality invariance imposes that the propagation speed of the odd perturbations goes to zero as fast as the effective screened charge of the object, potentially leading to strong coupling and an obstruction to the viability of the EFT below the screened radius. We then consider the linear response to external fields and compute the electric polarisability and the magnetic susceptibility. Imposing regularity of the perturbations at the position of the particle, we find that the polarisability for the odd multipoles vanishes whilst for the magnetisation Born-Infeld emerges as the only theory with vanishing susceptibility for even multipoles. The perturbation equations factorise in terms of ladder operators connecting different multipoles. There are two such ladder structures for the even sector: one that acts as an automorphism between the first four multipoles and another one that connects multipoles separated by four units. When requiring a similar ladder structure for the odd sector, Born-Infeld arises again as the unique theory. We use this ladder structure to relate the vanishing of the polarisability and the susceptibility to the values of conserved charges. Finally the perturbation equations correspond to a supersymmetric quantum mechanical system such that the polar sector can be described in terms of Schrodinger's equations with four generalised hyperbolic Posch-Teller potentials whose eigenfunctions are in correspondence with the multipoles." @default.
- W4310514429 created "2022-12-11" @default.
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- W4310514429 date "2022-11-29" @default.
- W4310514429 modified "2023-10-18" @default.
- W4310514429 title "Polarisability and magnetisation of electrically $K$-mouflaged objects: the Born-Infeld ModMax case study" @default.
- W4310514429 doi "https://doi.org/10.48550/arxiv.2211.16404" @default.
- W4310514429 hasPublicationYear "2022" @default.
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