"Boltzmann brain" meaning in English

{
  "etymology_text": "For Ludwig Boltzmann, Austrian physicist, on whose ideas it is based.",
  "forms": [
    {
      "form": "Boltzmann brains",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "Boltzmann brain (plural Boltzmann brains)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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        {
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          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A hypothetical self-aware entity that arises due to random fluctuations of spacetime."
      ],
      "id": "en-Boltzmann_brain-en-noun-0NGgtpr9",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "hypothetical",
          "hypothetical"
        ],
        [
          "self-aware",
          "self-aware"
        ],
        [
          "entity",
          "entity"
        ],
        [
          "random",
          "random"
        ],
        [
          "fluctuation",
          "fluctuation"
        ],
        [
          "spacetime",
          "spacetime"
        ]
      ],
      "raw_glosses": [
        "(physics) A hypothetical self-aware entity that arises due to random fluctuations of spacetime."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Boltzmann brain"
      ]
    }
  ],
  "word": "Boltzmann brain"
}

{
  "etymology_text": "For Ludwig Boltzmann, Austrian physicist, on whose ideas it is based.",
  "forms": [
    {
      "form": "Boltzmann brains",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Boltzmann brain (plural Boltzmann brains)",
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    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
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        "English multiword terms",
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        "en:Physics"
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      "glosses": [
        "A hypothetical self-aware entity that arises due to random fluctuations of spacetime."
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "hypothetical",
          "hypothetical"
        ],
        [
          "self-aware",
          "self-aware"
        ],
        [
          "entity",
          "entity"
        ],
        [
          "random",
          "random"
        ],
        [
          "fluctuation",
          "fluctuation"
        ],
        [
          "spacetime",
          "spacetime"
        ]
      ],
      "raw_glosses": [
        "(physics) A hypothetical self-aware entity that arises due to random fluctuations of spacetime."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Boltzmann brain"
      ]
    }
  ],
  "word": "Boltzmann brain"
}