![Chronological safety-the absence of closed timelike curves-is demonstrably bounded by parabolic regions defined by spin [latex]\varepsilon_a[/latex], equatorial angle θ, and stellar mass [latex]M_\ast[/latex] when calculations are performed with [latex]M = 1000 M_{Pl}[/latex].](https://arxiv.org/html/2602.17724v1/x6.png)
A new analysis explores how modified gravity theories might avoid the paradoxes of closed timelike curves, and proposes a way to detect causality violations near black holes through gravitational waves.
![With a pulse duration of [latex]\tau = 100\ \mathrm{as}[/latex], the study demonstrates that a cylindrical Gabor transform accurately reconstructs the shape of the energy-momentum spectrum, as evidenced by the near-perfect correspondence between calculated scattering probabilities and the transform’s isolated momentum distributions for a target with [latex]t_d = 0[/latex] and varying transversal widths [latex]\sigma_{\perp}[/latex].](https://arxiv.org/html/2602.18123v1/x3.png)
New research reveals how the size and properties of ultrashort electron pulses affect the precision of electron momentum spectroscopy, impacting our ability to image materials at the atomic scale.
![The Dandelion experiment, leveraging just 24.7 hours of measurement, establishes a new constraint on the kinetic mixing parameter χ for dark photons with masses between 0.6 and 1.4 meV, assuming these particles comprise the entirety of the local dark matter density of approximately [latex]0.44\,\text{GeV/cm}^{3}[/latex], and thereby defines a boundary beyond which existing theories regarding dark matter interaction must be revised.](https://arxiv.org/html/2602.18218v1/pics/excl.png)
The Dandelion experiment has initiated a new approach to detecting dark matter, focusing on the elusive dark photon and its potential directional signal.
![The analysis of phase shifts-calculated as a function of the coupling constant [latex]CMkk[/latex] for partial waves up to [latex]l=5[/latex]-demonstrates a distinction between spin-up and spin-down states, with the s-wave ([latex]l=0[/latex]) component exclusively residing within the spin-up branch as defined by equations (72) and (73).](https://arxiv.org/html/2602.17924v1/x2.png)
New research provides a refined framework for analyzing particle scattering within the finite volumes used in lattice quantum chromodynamics calculations.
Resonant ultrasound spectroscopy offers a rapid and non-destructive method for characterizing the mechanical properties of high-entropy alloys, accelerating the search for materials with optimal performance.
A new framework for quantifying molecular complexity offers a standardized approach to understanding the origins of life on Earth and beyond.
![Trajectories of [latex]z(t)[/latex] reveal how varying parameters [latex]Q[/latex] influence system behavior, offering a comparative analysis against the established characteristics of the Anti-de Sitter (AdS) case.](https://arxiv.org/html/2602.17757v1/x2.png)
New research demonstrates a striking connection between holographic Krylov complexity and the fundamental scale at which particles become confined within quantum field theories.
![A computational study demonstrates that a system of one thousand particles, all of equal mass, readily converges to a configuration exhibiting minimal variety-a state remarkably close to the absolute minimum of its potential energy landscape [latex]VV[/latex].](https://arxiv.org/html/2602.18115v1/x1.png)
New research reveals that the geometry of self-gravitating systems isn’t fixed, but emerges from the relationships between the particles themselves.
A new framework reveals how subtle arrangements within crystalline structures can give rise to unexpected symmetries and influence a material’s electronic behavior.
![The spectra of quantum field theory and spin systems-examined with parameters [latex]L=128[/latex], [latex]\ell=\pi[/latex], and [latex]m=1[/latex]-demonstrate a divergence attributable to the doubler mass scale, specifically at [latex]2p/\varepsilon - m[/latex], indicating a fundamental distinction in their spectral properties as the parameter <i>p</i> varies from 1 to 0.1.](https://arxiv.org/html/2602.17935v1/x1.png)
Researchers have developed a new method for modeling quantum field theories with boundaries in curved spacetime using open spin systems, offering a path to understanding physics in extreme environments.