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Author(s): An Huang and Christian Baadsgaard Jepsen p-adic string theory asks how much of string physics really depends on ordinary spacetime geometry. Quantum gravity may replace smooth short-distance geometry with more primitive or nonlocal structures; p-adic models provide a laboratory where the notion of distance is very different. This manuscript tests whether one of the most basic stringy signatures – the rapid high-energy growth of states...

Author(s): Guillermo Franco Abellán A disagreement over neutrino-mass estimates might be resolved by assuming that neutrinos decay into hypothetical massless particles. [Phys. Rev. D 113, 123527] Published Thu Jun 11, 2026

Author(s): Lorenzo Gavassino, Áron D. Kovács, and Harvey S. Reall The authors propose a “reduction of order” approach to deal with unphysical degrees of freedom that arise in relativistic viscous hydrodynamics and in gravitational effective field theories, not at the equation of motion level but in the initial data, expressing the data for the unphysical variables in terms of those for the physical ones. They also show that the apparent loss of...

Author(s): Antonio Garcia Vallejo and Matthew D. Sievert Generalized parton distributions (GPDs) encode information of all components of partonic momentum, potentially enabling three-dimensional spatial resolution of a nucleon’s substructure. The authors extend previous formulations of GPDs through a Wigner transform, and demonstrate its utility for the Helium-4 nucleus. The resulting master formula for GPDs manifests a novel spin-orbit coupling...

Author(s): Jordan Flitter, Julian B. Muñoz, and Andrei Mesinger Efficient treatment of Lyman-alpha photon multiple scattering is shown to be possible through semi-analytic treatment of the average distance that a photon traverses prior to absorption. By incorporating this scheme into the 21cmFAST code, the authors show that Lyman-alpha multiple scattering can cause significant differences in the predicted high-redshift 21cm power spectrum. ...

Author(s): Felix M. Heinze, Gerhard Schäfer, and Bernd Brügmann Although even the 2-body problem in general relativity (GR) has not been solved exactly, the so-called post-Newtonian (PN) expansion provides a valuable approximation scheme adequate for many physical situations. In the present paper, the N-body Hamiltonian is analytically evaluated (up to a single integral) at 2PN precision. This level of precision had previously been achieved only...

Author(s): Caio V. P. de Brito, David Wagner, Gabriel S. Denicol, and Dirk H. Rischke A standard lore in relativistic fluid dynamics is that the widely-used moment expansion for the single particle distribution function converges. The authors challenge this assumption, demonstrating in a simple example that the moment expansion does not produce decreasing multipole coefficients of a series of orthogonal polynomials. This divergence can nevertheless...