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        "quote": "而 $T _ { \\mu \\nu }$ 是所有物质场存在的能量–应力张量。常数 $\\kappa$ 被称为 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:da39fb35-44ff-46b2-8690-4deb1759352d\" data-concept-route=\"/concept-identities#concept-da39fb35-44ff-46b2-8690-4deb1759352d\" id=\"first-459d51d23d2eb2abbf92-zh\">爱因斯坦引力常数(Einstein’s gravitational constant)</u>；我们将把它与牛顿引力常数直接联系起来。这些方程具有这样的性质：对于弱场 $g _ { \\mu \\nu } \\approx \\eta _ { \\mu \\nu }$，当作出适当的等同后，它们约化为泊松方程（见下文对弱场近似的讨论），并且通过缩并的比安基恒等式 <a href=\"06-the-riemann-tensor-and-its-symmetries#equation-18-60\" class=\"cross-reference\" id=\"xref-08-general-relativity-5\" data-reference=\"equation-18-60\">式 (18.60)</a>，它们保证了一个“协变”版本的守恒恒等式",
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        "quote": "and $T _ { \\mu \\nu }$ is the energy–stress tensor of all the matter fields present. The constant $\\kappa$ is known as <u class=\"concept-term\" data-concept-identity=\"urn:uuid:da39fb35-44ff-46b2-8690-4deb1759352d\" data-concept-route=\"/concept-identities#concept-da39fb35-44ff-46b2-8690-4deb1759352d\" id=\"first-459d51d23d2eb2abbf92-en\">Einstein’s gravitational constant</u>; we shall relate it to Newton’s gravitational constant directly. These equations have the property that for weak fields, $g _ { \\mu \\nu } \\approx \\eta _ { \\mu \\nu }$ , they reduce to the Poisson equation when appropriate identifications are made (see the discussion of the weak field approximation below), and by the contracted Bianchi identity <a href=\"06-the-riemann-tensor-and-its-symmetries#equation-18-60\" class=\"cross-reference\" id=\"xref-08-general-relativity-5\" data-reference=\"equation-18-60\">Eq. (18.60)</a> they guarantee a ‘covariant’ version of the conservation identities",
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