Martin Drobczyk

This work studies regular black holes motivated by the scalar sector of density-responsive gravity (DRG). An algebraic prescription with phenomenological local running maps a Gaussian matter profile to a diagnostic density profile. A pressure check shows that this profile does not solve the full static DRG equations. It serves only to select an effective metric family with two horizons. The extremal mass is calibrated to M _min = √(1 + A /2) M _P ≃ 1.006 M _P , where A = 0.024 is the historical scalar response amplitude. A fit to ρ ( r ) = ρ ₀ exp[-( r / r _c ) ⁿ ] selects n = 2. The temperature is nonmonotonic, reaching T _H ^max = 0.02547 M _P at M = 1.332 M _P before vanishing at M _min . The calculation verifies the generic scaling near extremality Z _tr α ( M − M _min ) ^-1/2 of a static lapse diagnostic for n = 2, 3, 4, 6 and for the Hayward and Bardeen controls. A regulated integral of coordinate time between the horizons provides a static cavity diagnostic, not a prediction of echoes of gravitational waves. The remaining area entropy equals the area entropy already lost at M _cross / M ₀ = 0.707107 ≃ 1/√2. This geometric crossing does not establish a Page curve or unitarity. The endpoint area entropy is below 2.6% of the initial Bekenstein-Hawking entropy for M ₀ = 5 M _P and below 0.03% for M ₀ = 50 M _P . An inverse source reconstruction confirms an isotropic core of de Sitter type but retains the pressure mismatch. An exploratory collapse calculation with an imposed bounce factor produces bounded configurations with 1 - 2 m / r < 0 without establishing formation of the calibrated geometry. The robust results are the calibrated thermodynamics and generic scaling near extremality.

This Corrigendum reports three corrections to the published article: (i) clarification of the heavy-mediator resonance mass used for the two-mediator benchmark in table 1, (ii) correction of a typo in the scaling exponent for the light-mediator mass in figure 2 (left panel) and appendix I, and (iii) availability of a public reproducibility package.

We present a covariant scalar-field framework that unifies the space-time singularity regularization with dynamical dark energy. The theory extends general relativity by introducing a scalar field Φ whose potential couples to the Lorentz-invariant quantity X ≡ u α u β T matter α β , ensuring manifest covariance. The resulting density-responsive scalar energy ρ Φ exhibits dual behavior: (i) in high-density regimes, it saturates at ρ Φ ⩽ A M P 4 / 2 , providing a Planck-scale upper bound on the total energy density that regularizes classical singularities; (ii) in low-density regimes, it approaches a constant ρ Φ → A M U 4 , driving cosmic acceleration as dynamical dark energy. A natural renormalization group evolution with an anomalous dimension γ ≈ 0.501 connects the Planck scale to the meV dark energy scale without fine-tuning. The model makes distinctive, testable predictions: w 0 ≈ − 0.99 and w a ≈ + 0.03 , where the positive w _a distinguishes it from ΛCDM and standard quintessence models. Despite the novel interaction terms, the fifth forces are suppressed by β eff ∝ 1 / ρ m 2 , yielding factors below 10 ⁻⁵⁸ in laboratory environments, and ensuring compatibility with all precision gravity tests. This framework demonstrates how a single quantum field theory mechanism can simultaneously address UV singularities and IR dark energy, providing concrete predictions for future Stage-IV cosmological surveys.

We propose a minimal, fully thermal mechanism that resolves the long-standing tension between achieving the observed dark-matter relic abundance and explaining the astrophysical signatures of self-interactions. The framework introduces two mediators: a light scalar φ (MeV scale) that yields the required, velocity-dependent self-interactions, and a heavy scalar resonance Φ h (TeV scale) with mass m Φ h ≈ 2 m χ that opens an s -channel resonant annihilation during freeze-out. This clearly decouples early-Universe annihilation from late-time halo dynamics. A detailed numerical analysis identified a narrow predictive island of viability. A representative benchmark with m χ = 600 GeV, m ϕ = 15 MeV, and m Φ h ≃ 1.2 TeV reproduces the relic density and yields σ T / m χ ∼ 0.1 – 1   cm 2 g − 1 at dwarf-galaxy velocities while satisfying cluster bounds. The model makes sharp, testable predictions: a narrow t t ¯ resonance near 1.2 TeV within HL-LHC reach, and a spin-independent direct-detection signal σ SI ∼ 7 × 10 − 48 cm 2 within next-generation sensitivity. As an optional UV completion, we show that walking SU ( 3 ) H gauge theory with N f = 10 naturally realizes the near-threshold relation m Φ h ≈ 2 m χ and can furnish an effective anomalous dimension γ ≈ 0.5 which underlies a density-responsive dark-energy sector, suggesting a unified origin for the dark sector.

In the context of the Eu:CROPIS mission requirements, this paper aims to test and validate an intra-spacecraft wireless transmission carried between two SpW-to-UWB Wireless Interface Units (WIUs). The WIUs are designed to replace the on-board SpaceWire (SpW) connections of a spacecraft network. The novelty of this solution resides in prototyping and testing proprietary TRL6 WIUs for the implementation of both PDHU and CDHU units, which constitute a spacecraft network. The validation test scenarios employed in this paper were designed under the Eu:CROPIS mission system requirements as defined by the WiSAT-3 European Space Agency (ESA)-funded project. The SpW-to-UWB WIUs run a custom-built ISA100 over an IEEE 802.15.4 UWB PHY layer communication stack. The WIUs are evaluated based on four mission-specific performance test scenarios: (1) the link setup test, (2) the end-to-end delay test, (3) the maximum data rate test and (4) the housekeeping test. The validation test scenarios of the WIUs are carried out with the use of STAR-Dundee SpW-capable equipment. The test results demonstrate the reliability of the deployed SpW-to-UWB WIUs devices for UWB wireless communications carried out within a space shuttle. The SpW data were successfully transmitted across the intra-spacecraft wireless network in all experimental tests. The technology can be considered to be at the maturity level TRL6 (functionality demonstrated in relevant environment) for LEO missions.

This paper introduces Wireless Compose-2 (WICO2), which is an experiment for the International Space Station (ISS) in order to demonstrate the provision of a flexible and adaptable wireless network infrastructure integrated into a commodity item to conduct and execute low-power, low-weight and wireless experiments in the scientific and medical domain. Recent work revealed a great potential in utilizing Wireless Sensor Network (WSN) in space habitats; however, the focus was only placed on sensing in the narrowband Industrial Scientific and Medical (ISM) 2.45 GHz band. This work extends these capabilities by utilizing Impulse Radio Ultra Wideband (IR-UWB) for ranging and evaluates the use of internal light sources for energy harvesting to drive the sensor nodes. The focus of the WICO2 experiment is on the operation of the scientific experiment Ballistocardiography for Extraterrestrial Applications and long-Term missions (BEAT), which is a demonstration of novel Ballistocardiography (BCG) sensors to monitor important cardiovascular parameters in a microgravity environment. Integrated in a Smart-Shirt, it will form a Body Area Network and make use of the IR-UWB communication to transmit the data to the network. This paper describes the concept and pre-flight test results to demonstrate the correct function, usability and performance of WICO2.

Air traffic services, like the Automatic Dependent Surveillance Broadcast (ADS-B), already became a fundamental part in the civil and military aviation by the provision of aircraft tracking on ground and from space, in controlled and noncontrolled airspaces. In particular, the surveillance of aircraft from space has been identified as a trend-setting service and demand. In this paper, we present the design of a small size, low profile patch antenna, optimized for aircraft signal detection in spacecraft applications. The proposed antenna design is circularly polarized, using a single-feed configuration and it is tailored to small dimensions and the operation in a space environment.