noun
fringe science
Refers to scientific ideas or research that are outside mainstream science, often lacking strong evidence or acceptance.
彼は周辺科学の分野で独自の理論を展開している。
He is developing his own theories in the field of fringe science.
疑似科学 (pseudoscience) implies a stronger claim of being scientific while lacking proper methodology, whereas 周辺科学 simply denotes being on the fringes of mainstream science.
Compound of 周辺 (periphery) and 科学 (science), literally 'peripheral science'.