Chances of Being Accepted for a Book Author as a Graduate Student I recently identified a textbook which is currently looking for authors of chapters. It states "For selected and invited authors" on the website, so I am wondering, if I submit a chapter proposal, if it has any chance of being accepted having myself being the only author, and not having graduated with any graduate degree yet. I also have no publications, but several are in the process.

I asked my PI if he would coauthor it, and he responded stating that he gets several requests to write book chapters per year and does not do any of them because he does not have time.

My question to the more experienced: if a chapter proposal has content which is completely golden and is well-written, does it have a chance of being accepted to be included in the book? Are book authors generally desperate to find authors for currently-researched topics, or is it generally competitive? Would they even consider a graduate student author? If it matters, the field is physics/nanomaterials.
I don't know about physics, but in Computer Science book chapters tend to be the lowest class of peer-reviewed publication. Most book editors are struggling to get any good contributions, and the only chapter-books (as opposed to text books with a single, or few, dedicated authors) I really see succeed nowadays are written by a closed group of people for a specific purpose. For instance, I know that some Dagstuhl seminars collectively decide to write a book - every participant writes one or two chapters, often together with (a subset of) members of their research group.

For books with an open call, you can in my field basically never be too inexperienced to write a chapter, as long as your English is good. That said, I generally advise my students against writing one anyway. Chapters are fairly long, so they may take an inexperienced writer substantial time to write, and the reputation and scientific impact of having a chapter in a book that is virtually never read is so negligible that the same effort is better directed to writing a different kind of paper.

Finally, the reaction of your advisor may also be a hint that they don't value book chapters either. Even if you can get your chapter accepted, is it a good use of time to work on something that your advisor appears to not put much stock in?