Is it ethical to upload an automatically generated paper to a non peer-reviewed site as part of a larger research? I'm doing some research on my own as a side-project. In fact, I want no one from my research center to be involved in this research as I feel that they will take credit for my idea, like in past times. Nevertheless, if their involvement is completely necessary, I would consider it.

Anyways, this project requires to upload completely nonsense papers to Arxiv or similar. They are completely nonsense as they are artificially generated. The idea is to see if this is possible or how easy it is.

On the one hand, I don't want to pollute the scientific community with rubbish but in the other hand, I see that this step is necessary to continue further with this research.

My question is, how should I proceed? Should I do it and once I finish my research tell Arxiv that they can delete the files? Should I ask for permission first? Should I not do it at all?

EDIT: Just to make sure that everyone understands, this is not something that I have done yet. In fact, after seeing the responses, it is more than likely that I try to avoid publishing in arXiv. The objective is not to upload a paper to arXiv, is something else, but I was considering uploading it to arXiv as a medium for reaching another goal. Nevertheless, it is not my objective to pollute arXiv or the community.
"Shall I poison a well to see how many drink out of it?" 

Frankly, the idea of debunking review processes is not that new, and the latest wave started with the Sokal hoax. There were a couple of follow-ups, with computer-generated papers. 

The result was a scandal, a journalistic anecdote. It created attention. Been there, done that. It's no longer an original idea. We got it. You can fool badly screened journals and predatory conferences.

But ok, now, you talk about actual "research" with fake paper dissemination. That may or may not be a legitimate research question, but the fact that you talk about "poisoning" arXiv, which is a serious and expressly not peer-reviewed site makes it already very questionable what you are trying to achieve. 

It is one thing to embarrass badly screened journals or conferences (possibly even suspected predatory ones - namely the conferences in question) which Sokal and the SciGen people did, but quite another to abuse a perfectly legitimate repository for non-peer-reviewed papers. In other words, it relies on good will and honesty of the submitters trying to submit good quality work. There are minor safeguards in place to avoid obvious scientific spam, but not against antagonistic submitters.

I do not know (and I do not want to know) what you are trying to achieve with this experiment, but the damage that you are likely to do with this can be so substantial in terms of loss of trust of arXiv and preprint services etc, that you would seriously need to pass it through an ethics committee who can evaluate what legitimate experimental parameters for such a large scale social experiment would be. 

Without such a permission and clear delineation of your duties and limitations (which your institution's ethical committee has to evaluate), this research will be unpublishable in a serious journal. And frankly, your academic reputation will be finished. Damaging one of the most valuable resources of openly accessibly publications will make you persona non grata in academia. 

Let me add one more thing. There are other preprint servers which have a less strong reputation. There, your experiment may do less damage, though also be less expressive. However, even there, I should believe that they rely on good will and that wilful tainting of wells for scientific knowledge is simply maximally antagonistic to the endeavour of science.

TL;DR: I believe the experiment is highly unethical and extremely damaging. However, you may want to see whether your institution's ethics committee can identify conditions under which such a social experiment might be feasible.