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arXiv · 2610.18977

Thin shells in Lovelock and Quasi-topological gravities

Pablo Bueno·Pablo A. Cano·Robie A. Hennigar·Ángel J. Murcia·Aitor Vicente-Cano
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Abstract

We derive the junction conditions for spherically symmetric thin shells in Lovelock and Quasi-topological gravities along two independent routes: from the distributional form of the field equations, and from the boundary term that makes the variational problem well-posed in the non-null case. The former method is ambiguous as it stands, since the equations contain products of Heaviside step functions with a Dirac delta. We show that the singular parts of the field equations are exact differentials in the jumping variables, so that the Vol'pert chain rule for functions of bounded variation fixes these singular combinations uniquely and no products of two deltas survive for a single shell, finding that both routes then agree. The same rule yields the null junction conditions, for which no boundary term is available in Quasi-topological gravities, together with the mass conservation law of the shell. These results clarify recent questions concerning the existence of thin shells in these theories. In particular, we show that previous claims that the junction conditions force the shell mass to vary with radius are incorrect and arise from treating a trapezoidal approximation to the relevant distributional products as exact. Our results also provide a basis for the recent analyses of mass inflation in these theories.

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Pablo Bueno, Pablo A. Cano, Robie A. Hennigar, Ángel J. Murcia, Aitor Vicente-Cano. 2026-10-13. Thin shells in Lovelock and Quasi-topological gravities. https://arxiv.org/abs/2610.18977

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