"Alcubierre metric" meaning in English

{
  "etymology_text": "Named after Mexican physicist Miguel Alcubierre.",
  "forms": [
    {
      "form": "Alcubierre metrics",
      "tags": [
        "plural"
      ]
    }
  ],
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      "args": {},
      "expansion": "Alcubierre metric (plural Alcubierre metrics)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Faster-than-light travel",
          "orig": "en:Faster-than-light travel",
          "parents": [
            "Astrophysics",
            "Relativity",
            "Science fiction",
            "Travel",
            "Astronomy",
            "Physics",
            "Fiction",
            "Speculative fiction",
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          "name": "Relativity",
          "orig": "en:Relativity",
          "parents": [
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
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        }
      ],
      "glosses": [
        "A type of spacetime metric. See warp bubble."
      ],
      "id": "en-Alcubierre_metric-en-noun-j-1uqluM",
      "links": [
        [
          "relativity",
          "relativity"
        ],
        [
          "spacetime",
          "spacetime"
        ],
        [
          "warp bubble",
          "warp bubble"
        ]
      ],
      "qualifier": "relativity",
      "raw_glosses": [
        "(relativity) A type of spacetime metric. See warp bubble."
      ],
      "related": [
        {
          "word": "Alcubierre drive"
        }
      ]
    }
  ],
  "word": "Alcubierre metric"
}

{
  "etymology_text": "Named after Mexican physicist Miguel Alcubierre.",
  "forms": [
    {
      "form": "Alcubierre metrics",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "Alcubierre metric (plural Alcubierre metrics)",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "Alcubierre drive"
    }
  ],
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        "en:Faster-than-light travel",
        "en:Relativity"
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      "glosses": [
        "A type of spacetime metric. See warp bubble."
      ],
      "links": [
        [
          "relativity",
          "relativity"
        ],
        [
          "spacetime",
          "spacetime"
        ],
        [
          "warp bubble",
          "warp bubble"
        ]
      ],
      "qualifier": "relativity",
      "raw_glosses": [
        "(relativity) A type of spacetime metric. See warp bubble."
      ]
    }
  ],
  "word": "Alcubierre metric"
}