![Radio spectra from the supermassive black hole M87\* and the Crab Nebula demonstrate that distortions in the continuum emission-resulting from photon conversion processes governed by parameters such as [latex] m_{A^{\prime}} [/latex] and ε-offer a means of characterizing the environments surrounding these distinct astrophysical objects.](https://arxiv.org/html/2601.15985v1/x5.png)
New research suggests that the turbulent plasma around black holes and neutron stars could dramatically amplify the detection of elusive dark photons, potentially exceeding the sensitivity of laboratory experiments.
![The setup investigates [latex]\pi\pi[/latex]-junctions to realize even-denominator fractional quantum states, with net charge flow indicated by blue lines and the presence of Majorana modes denoted by red dashed lines.](https://arxiv.org/html/2601.15386v1/x4.png)
This review explores the theoretical landscape of next-generation fractional quantum Hall states, moving beyond established models to characterize exotic topological phases of matter.
![The correlation between branching ratios-specifically [latex]\bar{{\cal B}}(B_{s}\to\tau^{+}\mu^{-})[/latex] and [latex]{\cal B}(\bar{B}^{0}\to\bar{K}^{\*0}\tau^{+}\mu^{-})[/latex]-reveals a sensitivity to the mass scale of a hypothetical Z' boson, exhibiting distinct relationships at [latex]M_{Z^{\prime}}=1[/latex] TeV and [latex]M_{Z^{\prime}}=3[/latex] TeV when constrained by limits established from charged lepton flavor violation.](https://arxiv.org/html/2601.16001v1/LogPlot3000.png)
A new analysis explores how subtle connections between quark and lepton behavior can constrain extensions to the Standard Model of particle physics.
![Microscopic spacetime fluctuations exhibit directional dependence determined by the sign of [latex]\bar{X}^{\alpha}_{0}[/latex]; when [latex]\bar{X}^{\alpha}_{0}[/latex] is negative, fluctuations occur with a characteristic length scale defined by [latex]\bar{X}^{\alpha}_{0}/2 < L_{-} \leq \bar{X}^{\alpha}_{0}[/latex] and [latex]L_{+} \geq \bar{X}^{\alpha}_{0}[/latex], reversing for positive values of [latex]\bar{X}^{\alpha}_{0}[/latex].](https://arxiv.org/html/2601.15649v1/x2.png)
A new theoretical framework proposes that spacetime isn’t fundamental, but emerges from the dynamics of scale measurements and quantum fluctuations.
![The analysis of [latex]\pi^{+}\pi^{-}e^{+}e^{-} [/latex] decay events-both from Monte Carlo simulation and experimental data-demonstrates a clear correlation between missing mass and invariant mass, constrained by a defined criterion to accurately identify and characterize the decay products.](https://arxiv.org/html/2601.15887v1/x4.png)
Researchers are probing the existence of axion-like particles by meticulously analyzing rare decays of the eta meson, seeking evidence beyond the Standard Model.
New research demonstrates that continuously monitoring a quantum walk can induce a dramatic change in how it splits, akin to a phase transition.
Researchers are exploring how to construct de Sitter space – a key component of our universe’s expansion – as an excited state within the framework of string theory, pushing the boundaries of theoretical cosmology.
![Twisted periodic boundary conditions reveal fundamental distinctions in the momentum distributions of one-dimensional systems, demonstrating that spatially localized states maintain a trivial momentum [latex]K_0 = 0[/latex] regardless of twisting, while extended, delocalized states exhibit a corresponding shift in their momentum peaks-a behavior that contrasts with the uniform distribution observed in localized states and allows for their differentiation based on boundary conditions.](https://arxiv.org/html/2601.15345v1/x1.png)
New research reveals a fundamental connection between a system’s momentum distribution and the extent of entanglement when translational symmetry is absent.
New matter-wave interferometry experiments reveal the full distribution of order parameter fluctuations in two-dimensional Bose gases, providing insights into universal behavior at the BKT transition and non-equilibrium dynamics.
A new theoretical model explores a universe that avoided a singularity by ‘bouncing’ from a contracting phase, offering a potential solution to the Hubble tension and insights into the earliest moments of existence.