Based on the information provided in the search results and my existing knowledge, arXiv currently serves several major scientific and academic fields. However, there are some additional notable fields that are not explicitly mentioned in the given text. Here are some fields that could be considered missing:
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Astrophysics: While this could be considered part of physics, it is often treated as a distinct category on arXiv[1].
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Condensed Matter Physics: This is a major subfield of physics that is typically given its own category on arXiv[1].
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High Energy Physics: Another important subfield of physics with its own category[1].
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Materials Science: This interdisciplinary field often overlaps with physics and chemistry but is not explicitly mentioned.
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Chemistry: While some chemistry-related papers might be found in other categories, it's not a primary focus of arXiv.
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Earth and Planetary Sciences: This field is not prominently featured on arXiv.
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Social Sciences: Apart from economics, other social sciences are not widely represented on arXiv.
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Cognitive Science: This interdisciplinary field combining psychology, neuroscience, and computer science is not explicitly mentioned.
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Artificial Intelligence: While this could be considered part of computer science, it's often given special attention due to its rapid growth and importance[1].
It's worth noting that arXiv's coverage of fields can evolve over time. Some fields may not use arXiv as extensively due to different publishing norms or preferences within those academic communities[2]. The adoption of preprint servers like arXiv can vary significantly across disciplines, with physics and mathematics being early and enthusiastic adopters.
Citations:
[1] https://info.arxiv.org/help/prep.html
[2] https://academia.stackexchange.com/questions/88653/why-do-some-fields-not-use-arxiv
[3] https://forums.zotero.org/discussion/80875/missing-the-date-field-in-arxiv-feed