Tootfinder

Searching for Di-Higgs Signatures of Light Charged Scalars
Guglielmo Coloretti, Andreas Crivellin, Syuhei Iguro
https://arxiv.org/abs/2507.00121 https://…

Searching for Di-Higgs Signatures of Light Charged Scalars
The excess in $t\to b\overline{b}c$ observed by ATLAS points towards a charged Higgs boson with a mass around 130$\,$GeV, consistent with the expectations from the $B$ anomalies, i.e.$~R_{D^{(*)}}$ and $b\to s\ell^+\ell^-$ data. As a non-minimal flavour structure is required for an explanation of these observables, this points towards a two-Higgs-doublet model with generic Yukawa couplings. Such a scenario predicts a sizable cross section for the pair production of the charged Higgs at the Larg…

Strichartz estimates for a Schr\"odinger equation on the half-line with a Neumann boundary condition
Nicola Garofalo, Gigliola Staffilani
https://arxiv.org/abs/2507.19998 h…

Strichartz estimates for a Schrödinger equation on the half-line with a Neumann boundary condition
In this paper we prove some new Strichartz estimates related to the Cauchy problem for the Bessel operator on the half-line and we establish a fractal version of the Tomas-Stein restriction theorem for the Hankel transform. Then we use the proved Strichartz estimates to show global in time well-posedness for a class of nonlinear $L^2_a$-critical problems, and local in time well-posedness in the sub-critical case.

Instantaneous Failure, Repair and Mobility Rates for Markov Reliability Systems: A Wind-Farm application
Guglielmo D'Amico, Filippo Petroni
https://arxiv.org/abs/2506.17280

Instantaneous Failure, Repair and Mobility Rates for Markov Reliability Systems: A Wind-Farm application
The Rate of Occurrence of Failures (ROCOF) is a widely utilized indicator for assessing a system's performance over time, yet it does not fully disclose the instantaneous behavior of a system. This paper introduces new measures to complement the ROCOF, providing a more comprehensive understanding of system reliability, particularly for Markov systems. We define the Rate of Occurrence of Repairs (ROCOR), which quantifies the system's instantaneous tendency to transition from failure to working s…

Exploring MAXI J1744-294: IXPE insights into a Newly Discovered X-ray Transient
Lorenzo Marra, Romana Miku\v{s}incov\'a, Federico M. Vincentelli, Fiamma Capitanio, Melania Del Santo, Sergio Fabiani, Shifra Mandel, Fabio Muleri, Maxime Parra, Paolo Soffitta, Antonella Tarana, M. Cristina Baglio, Stefano Bianchi, Enrico Costa, Antonino D'A\`i, Barbara De Marco, Michal Dov\v{c}iak, Vittoria Elvezia Gianolli, Andrea Gnarini, Maitrayee Gupta, Adam Ingram, Guglielmo Mastroserio, Gior…

Exploring MAXI J1744-294: IXPE insights into a Newly Discovered X-ray Transient
We present the first IXPE spectro-polarimetric observation of the black hole candidate MAXI J1744$-$294, a transient X-ray source discovered during a bright 2025 outburst in the Galactic center region. During the $\sim$150 ks observation, the source was found in the soft state, and its spectrum was well described by an absorbed multicolor disk with a minor high-energy tail. No significant polarization was detected, and we derived a 3$σ$ upper limit on the polarization degree of $1.3\%$ in the …

Emergence of Generic Entanglement Structure in Doped Matchgate Circuits
Alessio Paviglianiti, Luca Lumia, Emanuele Tirrito, Alessandro Silva, Mario Collura, Xhek Turkeshi, Guglielmo Lami
https://arxiv.org/abs/2507.12526

Emergence of Generic Entanglement Structure in Doped Matchgate Circuits
Free fermionic Gaussian, a.k.a. matchgate, random circuits exhibit atypical behavior compared to generic interacting systems. They produce anomalously slow entanglement growth, characterized by diffusive scaling $S(t) \sim \sqrt{t}$, and evolve into volume-law entangled states at late times, $S \sim N$, which are highly unstable to measurements. Here, we investigate how doping such circuits with non-Gaussian resources (gates) restores entanglement structures of typical dynamics. We demonstrate …

Black Hole - Neutron Star and Binary Neutron Star Mergers from Population III and II stars
Benedetta Mestichelli, Michela Mapelli, Filippo Santoliquido, Manuel Arca Sedda, Marica Branchesi, Lavinia Paiella, Guglielmo Costa, Giuliano Iorio, Matthew Mould, Veronika Lipatova, Boyuan Liu, Ralf S. Klessen
https://arxiv.org/abs/2506.1…

Black Hole - Neutron Star and Binary Neutron Star Mergers from Population III and II stars
Population III (Pop.$~$III) stars are expected to be massive and to undergo minimal mass loss due to their lack of metals, making them ideal progenitors of black holes and neutron stars. Here, we investigate the formation and properties of binary neutron star (BNS) and black hole-neutron star (BHNS) mergers originating from Pop.$~$III stars, and compare them to their metal-enriched Population II (Pop.$~$II) counterparts, focusing on their merger rate densities (MRDs), primary masses and delay t…

Nonlinear Joint Spectral Radius
Piero Deidda, Nicola Guglielmi, Francesco Tudisco
https://arxiv.org/abs/2507.11314 https://arxiv.org/…

Nonlinear Joint Spectral Radius
We introduce a nonlinear extension of the joint spectral radius (JSR) for switched discrete-time dynamical systems governed by sub-homogeneous and order-preserving maps acting on cones. We show that this nonlinear JSR characterizes both the asymptotic stability of the system and the divergence or convergence rate of trajectories originating from different points within the cone. Our analysis establishes upper and lower bounds on the nonlinear JSR of a sub-homogeneous family via the JSRs of two …

Generative Models for Parameter Space Reduction applied to Reduced Order Modelling
Guglielmo Padula, Gianluigi Rozza
https://arxiv.org/abs/2506.09721 https…

Generative Models for Parameter Space Reduction applied to Reduced Order Modelling
Solving and optimising Partial Differential Equations (PDEs) in geometrically parameterised domains often requires iterative methods, leading to high computational and time complexities. One potential solution is to learn a direct mapping from the parameters to the PDE solution. Two prominent methods for this are Data-driven Non-Intrusive Reduced Order Models (DROMs) and Parametrised Physics Informed Neural Networks (PPINNs). However, their accuracy tends to degrade as the number of geometric p…

Peaking into the abyss: Characterizing the merger of equatorial-eccentric-geodesic plunges in rotating black holes
Guglielmo Faggioli, Maarten van de Meent, Alessandra Buonanno, Gaurav Khanna
https://arxiv.org/abs/2507.05870

Peaking into the abyss: Characterizing the merger of equatorial-eccentric-geodesic plunges in rotating black holes
We study the gravitational waveforms generated by critical, equatorial plunging geodesics of the Kerr metric that start from an unstable-circular-orbit, which describe the test-mass limit of spin-aligned eccentric black-hole mergers. The waveforms are generated employing a time-domain Teukolsky code. We span different values of the Kerr spin $-0.99 \le a \le 0.99 $ and of the critical eccentricity $e_c$, for bound ($0 \le e_c<1$) and unbound plunges ($e_c \ge 1$). We find that, contrary to expe…

Bifurcation from periodic solutions of central force problems in the three-dimensional space
Alberto Boscaggin, Guglielmo Feltrin, Duccio Papini
https://arxiv.org/abs/2506.05842

Bifurcation from periodic solutions of central force problems in the three-dimensional space
The paper deals with electromagnetic perturbations of a central force problem of the form \begin{equation*} \dfrac{\mathrm{d}}{\mathrm{d}t} \bigl( φ(\dot{x}) \bigr) = V'(|x|) \dfrac{x}{|x|} + E_{\varepsilon}(t,x)+\dot{x} \wedge B_{\varepsilon}(t,x), \qquad x \in \mathbb{R}^3 \setminus \{0\}, \end{equation*} where $V \colon (0,+\infty) \to \mathbb{R}$ is a smooth function, $E_\varepsilon$ and $B_\varepsilon$ are respectively the electric field and the magnetic field, smooth …