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Vento, V. (2026). Under the spell of chiral symmetry. J. Subatom. Par. Cosm., 6, 100448–5pp.
Abstract: In this reflection, I want to look back over more than thirty years, from 1978 to 2008, of my professional and personal relationship with Mannque Rho. I will briefly describe some of the original ideas that emerged from our collaboration: the Little Bag, the Cheshire Cat principle, and Skyrmion matter. I do not intend to be exhaustive, neither in content nor in references, which can be found in our published works. Instead, I want to retrace the path we took together through physics, accompanied by many good friends.
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Moretti, F., & Bombacigno, F. (2026). Dynamical system analysis of the cosmological phases in Palatini k-essence gravity. J. Cosmol. Astropart. Phys., 09(9), 040–45pp.
Abstract: We formulate a generalized k-essence model in the presence of a Palatini f (R) gravitational sector. In the corresponding biscalar-tensor theory, we discuss the distinguished be still algebraically solved in terms of matter, the k-essence field and its kinetic term. We derive the conditions ensuring the absence of Ostrogradsky modes and the well-posedness of the initial data problem, also providing an intriguing analogy with a specific class of DHOST theories. Then, we investigate the cosmology of a flat Friedmann-Lema & icirc;tre-Robertson-Walker spacetime according to a dynamical system approach, with the aim of determining the set of fixed points in the phase space, representing specific periods of the Universe evolution and characterized by different effective barotropic index weft. The analysis reveals the presence of a range of possible configurations, with the existence of (quasi) de-Sitter epochs connected by hetero clinic orbits, scaling solutions and quintessence phases.
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Ellis, J. R., Mavromatos, N. E., Mitsou, V. A., & Pinfold, J. L. (2026). MoEDAL-MAPP: the first dedicated search experiment at the LHC. Eur. Phys. J.-Spec. Top., , 7pp.
Abstract: This special issue brings together a collection of original research articles and review papers addressing topics directly related to the MoEDAL-MAPP experiment at the Large Hadron Collider (LHC). The experiment is designed to search for (meta-)stable, anomalously ionising particles predicted by theoretical extensions of the Standard Model. Several contributions explore the theoretical and phenomenological aspects of models of particular relevance to the experiment, including scenarios involving magnetic monopoles, highly electrically charged particles, and millicharged particles. Other contributions focus on experimental developments, highlighting novel detection techniques and technological advances aimed at identifying these unconventional signatures and probing new phenomena beyond the Standard Model.
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Camilletti, G., Lledo, M. A., & del Olmo, M. A. (2026). On the unitary irreducible representations of the D=2 Euclidean and Poincare groups. Int. J. Geom. Methods Mod. Phys., , 2630003–36pp.
Abstract: In this paper, we present an explicit construction of the unitary irreducible representations of the two-dimensional Euclidean and Poincaré groups, together with their Spin double covers, by means of Mackey's theory of induced representations for semidirect products. In dimension D = 2, the simplicity of the corresponding little groups allows a complete explicit treatment of momentum orbits, equivariant wavefunctions, and representation operators. For the Euclidean group, the matrix elements of the infinite-dimensional representations are expressed in terms of Bessel functions. For the Poincaré group, the richer Lorentzian orbit structure leads to matrix elements involving modified Bessel and Hankel functions and, in some cases, tempered distributions, requiring the use of Rigged Hilbert Spaces. This work illustrates the interplay among induced representations, harmonic analysis on Lie groups, spin geometry, and special functions in a fully explicit relativistic setting.
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Camacho, J. M., Miro, C., Nebot, M., & Tobarra, T. (2026). On vacua and bounded masses in the general 2HDM. Phys. Lett. B, 881, 140928–7pp.
Abstract: Two Higgs doublets models with a scalar potential that breaks electroweak symmetry spontaneously can have either one or two local minima. While potentials with one minimum can have a decoupling regime where all the new scalars are heavy, we show that, for potentials with two local minima, the masses of all the scalars are bounded if the dimensionless quartic couplings obey perturbativity constraints.
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