Speaker
Description
The initial state in ultrarelativistic heavy-ion collisions is described by the Color-Glass Condensate (CGC) framework, where the collision of two colored glass sheets produces strong, coherent gluon fields known as the Glasma. The subsequent evolution of these classical colored fields is governed by the Classical Yang-Mills (CYM) equations. We study the growth of instabilities in expanding Glasma fields by introducing controlled spectral perturbations to the electric fields and gauge links. We employ Fast Fourier Transforms to implement various filters in momentum space, including Gaussian, power-law, and narrow-band forms, allowing us to excite and isolate specific momentum modes. By tracking the difference between two initially close gauge-field configurations via the measures $\mathrm{Tr}(\delta E_\eta)^2$ and $\mathrm{Tr}(\delta B_\eta)^2$, where $E_\eta$ and $B_\eta$ are the longitudinal colored electric and magnetic fields, we observe an exponential growth of unstable modes following the functional form $e^{\lambda \sqrt{g^2 \mu \tau}}$, where $\tau$ is proper time, $g$ is the coupling constant, and $g^2\mu \sim Q_s$ with $Q_s$ being the saturation scale. Remarkably, for all perturbation kernels and strengths studied, we find a consistent Lyapunov exponent $\lambda \sim 0.4$, indicating a robust chaotic amplification that is largely insensitive to the spectral details of the initial perturbation. Moreover, we extend this chaotic analysis to the transport of hard probes, studying the trajectories of heavy quarks propagating through the evolving non-Abelian fields via Wong's equations.
| Is this an experimental talk? | No |
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| Is this on behalf of a collaboration? | No |
| Are you willing to present as a poster if it is not selected for oral presentation? | Yes |