"Cauchy horizon" meaning in English

{
  "etymology_text": "Named after Augustin-Louis Cauchy",
  "forms": [
    {
      "form": "Cauchy horizons",
      "tags": [
        "plural"
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      "expansion": "Cauchy horizon (plural Cauchy horizons)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Black holes",
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          "langcode": "en",
          "name": "Differential equations",
          "orig": "en:Differential equations",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
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            "Fundamental"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Relativity",
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        },
        {
          "kind": "topical",
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          "name": "Shapes",
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Surfaces",
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        }
      ],
      "glosses": [
        "A light-like boundary of the domain of validity of a Cauchy problem. One side of the horizon contains closed space-like geodesics and the other side contains closed time-like geodesics."
      ],
      "id": "en-Cauchy_horizon-en-noun-E3h2UTAd",
      "links": [
        [
          "physics",
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        [
          "Cauchy problem",
          "Cauchy problem"
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      "raw_glosses": [
        "(physics) A light-like boundary of the domain of validity of a Cauchy problem. One side of the horizon contains closed space-like geodesics and the other side contains closed time-like geodesics."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Augustin-Louis Cauchy"
      ]
    }
  ],
  "word": "Cauchy horizon"
}

{
  "etymology_text": "Named after Augustin-Louis Cauchy",
  "forms": [
    {
      "form": "Cauchy horizons",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "Cauchy horizon (plural Cauchy horizons)",
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "A light-like boundary of the domain of validity of a Cauchy problem. One side of the horizon contains closed space-like geodesics and the other side contains closed time-like geodesics."
      ],
      "links": [
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          "physics",
          "physics"
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          "Cauchy problem",
          "Cauchy problem"
        ]
      ],
      "raw_glosses": [
        "(physics) A light-like boundary of the domain of validity of a Cauchy problem. One side of the horizon contains closed space-like geodesics and the other side contains closed time-like geodesics."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Augustin-Louis Cauchy"
      ]
    }
  ],
  "word": "Cauchy horizon"
}