Black Hole Light Could Reveal a Hidden Side of Reality
A new proposal suggests the Event Horizon Telescope could detect subtle polarization patterns in light around black holes, potentially unveiling evidence of CP violation in the vacuum itself.
Science
Inside Baryons: Mapping Their Gravitational Shape
![The study details a comparison of gravitational form factors - specifically [latex]A_{T20}(t)[/latex] and [latex]\bar{B}_{T20}(t)[/latex] - as they vary with transverse momentum transfer for up quarks within both a proton and a [latex]\Xi^{0}[/latex] baryon, illuminating fundamental aspects of their internal structure.](https://arxiv.org/html/2601.21430v1/x2.png)
New research explores how the internal structure of protons and hyperons influences their response to gravitational forces.
Entanglement in Curved Spacetime: A Numerical Approach
![The study demonstrates that entanglement entropy scales with the square of the AdS radius [latex]R^{2}[/latex], consistent with an area law, and further reveals that the proportionality constant-indicated by the slope-is itself a function of the AdS radius [latex]L[/latex].](https://arxiv.org/html/2601.21566v1/figures/AdS_Fn_of_s.png)
New calculations reveal how quantum entanglement behaves in warped spacetime geometries, bridging the gap between gravity and quantum field theory.
Wave-Like Order in Turbulent Chaos
Researchers have experimentally observed long-range correlations in a turbulent system, revealing an underlying order previously predicted by theoretical models.
Waking the Wave: Observing Collective Excitations in a Critical One-Dimensional System
![The study demonstrates that a system initialized within the ground state of the [latex]XXZ[/latex] Hamiltonian and subsequently evolved under a different Hamiltonian exhibits underdamped oscillations in the [latex]U(1)[/latex]-symmetric probe, with the oscillation frequency dictated by the final Hamiltonian’s parameter and the amplitude scaled by the magnitude of the difference between initial and final Hamiltonian parameters-a behavior consistently observed across a range of parameter values.](https://arxiv.org/html/2601.20926v1/x1.png)
New research details the observation and characterization of an underdamped amplitude mode arising from quantum quenches in a one-dimensional spin system.
Hunting for Hidden Hadrons: A Search for Exotic Decay Paths
![The distributions of [latex]M(\pi^{+}\pi^{-}J/\psi)[/latex] and [latex]M(\eta_{h}\psi(2S))[/latex] at center-of-mass energies of 4.92 and 4.95 GeV reveal distinct signal regions for [latex]\psi(2S)[/latex] and [latex]\psi_{0}(4360)[/latex], as demonstrated through a comparison of data-represented by black dots with error bars-with inclusive and signal Monte Carlo simulations of [latex]e^{+}e^{-}\rightarrow\eta\psi_{0}(4360)[/latex].](https://arxiv.org/html/2601.21190v1/x755.png)
New data from the BESIII experiment probes the decay of a mysterious particle, seeking evidence for its composition and furthering our understanding of exotic hadronic states.
Twisting Magnetism: How Quantum Geometry Controls Material Response
![The Zeeman metric connection, spin-rotation Berry curvature, and spin-rotation quantum metric exhibit monopolar, dipolar, and quadrupolar characters, respectively, correlating with non-vanishing or vanishing non-equilibrium Green’s function (NGM) conductivity-a behavior consistent with time-reversal symmetry-and demonstrated in a hexagonally warped Dirac system with parameters [latex]vf=1[/latex] eV, [latex]\lambda=255[/latex] eV⋅ų at [latex]T=10[/latex] K and [latex]\chi_{0}=\left(\frac{g\mu_{B}}{2}\right)^{2}\,\mathrm{A\,m^{-1}\,T^{-2}}[/latex].](https://arxiv.org/html/2601.22019v1/x1.png)
New research reveals the fundamental link between a material’s quantum geometry and its nonlinear magnetic behavior, opening doors for designing materials with tailored magnetic properties.
The Earth’s Hidden Role in the Hunt for Neutrino Secrets
![The probability of observing a [latex]\nu_\mu[/latex] to [latex]\nu_e[/latex] appearance oscillation at the Deep Underground Neutrino Experiment (DUNE) demonstrates a discernible dependence on the assumed average Earth matter density, with variations of ±5% and ±10% around a reference density of [latex]2.848~\mathrm{g\,cm^{-3}}[/latex] inducing measurable shifts in oscillation probability as a function of neutrino energy across the 1300 km baseline.](https://arxiv.org/html/2601.21256v1/fig2.png)
A new review highlights how accurately mapping our planet’s density is becoming essential for teasing out subtle patterns in neutrino behavior.
Beyond Tension: Exploring the Strange World of Null Strings
This review delves into the surprising physics of null strings, a unique limit of string theory with profound implications for our understanding of spacetime and quantum gravity.
Inside Black Holes: Beyond the Singularity’s Chaos
![In Einstein-GB gravity, with parameters set to [latex] \alpha\_2 = 10^{-2} [/latex] and in four dimensions, the dynamics of interior spikes-specifically the effective Kasner exponents and spike positions-exhibit a quantifiable relationship to initial horizon values of the scalar field; analysis demonstrates that for [latex] \psi(z\_H) = 0.10 [/latex], spike positions scale as [latex] z\_n = 32.67(n-0.09)^{1/0.50} [/latex] with corresponding amplitudes of [latex] \widetilde{p}\_{x\_n} = 0.99 + 2.64 \times 10^{-3} z\_n^{0.48} [/latex], while for [latex] \psi(z\_H) = 0.30 [/latex], the scaling shifts to [latex] z\_n = 44.68(n+0.04)^{1/0.50} [/latex] with amplitudes of [latex] \widetilde{p}\_{x\_n} = 1.00 + 3.72 \times 10^{-3} z\_n^{0.50} [/latex].](https://arxiv.org/html/2601.21658v1/x16.png)
New research reveals a surprisingly ordered structure within black holes, challenging traditional models of their final moments.