通过高能伽马射线偏振度探测强激光场中的真空双折射
Probing vacuum birefringence in an Ultrastrong Laser Field via High-energy Gamma-ray Polarimetry
AI总结：
利用高能伽马射线偏振度探测强激光场中的真空双折射，通过非线性康普顿散射生成圆偏振伽马射线，实现真空双折射的实验室检测。
摘要：
真空双折射（VB），非线性量子电动力学（QED）的一个基本预测，一直未能在实验室中直接检测到，因为其极端微弱。我们提出了一种紧凑的、"自探测"方案，其中GeV电子束与拍瓦激光脉冲头对头碰撞。通过非线性康普顿散射在同一脉冲中生成的圆偏振伽马射线，然后探测其诱导的双折射真空。这种集成设计规避了传统泵浦-探测设置的严格同步和束流传输要求。我们的非微扰强场QED模拟揭示了清晰的VB特征：圆偏振到线偏振的转换，诱导的斯图尔特定数S₁在所选角度范围内达到约0.019。这对应于在微米尺度路径上折射率差Δn=1.829×10⁻⁴，可以直接测量为e⁺e⁻对分布中的高对比度"X形"不对称性。该方案提供了一条可行的路径，利用当前激光和加速器技术首次实验室VB检测。
英文摘要：
Vacuum birefringence (VB), a fundamental prediction of nonlinear quantum electrodynamics (QED), has eluded direct laboratory detection due to its extreme weakness. We propose a compact, "self-probing" scheme where a GeV electron beam collides head-on with a petawatt laser pulse. Circularly polarized gamma-ray photons, generated via nonlinear Compton scattering in the same pulse, then probe the birefringent vacuum it induces. This integrated design bypasses the stringent synchronization and beam transport requirements of traditional pump-probe setups. Our nonperturbative strong-field QED simulations reveal a clear VB signature: conversion of circular to linear polarization, with the induced Stokes parameter $S_1$ reaching ~0.019 within the selected angular range. This corresponds to a refractive index difference $Δn = 1.829 \times 10^{-4}$ over micron-scale paths, directly measurable as a high-contrast "X-shape" asymmetry in $e^+e^-$ pair distributions. The scheme provides a feasible path to first laboratory VB detection with current laser and accelerator technologies.
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