"rigorous topic" is correct and usable in written English.
You can use it to describe an academic subject or debate that requires intense or thorough study. For example, "This is a rigorous topic, so you need to be prepared for in-depth research."
After winning the election, members still need to go through hours of rigorous training on topics concerning children, as well as project planning and programme implementation.
Especially as the demands for mobile communications increase explosively, the importance of careful use of radio resources increases and the last decade has witnessed rigorous research on this topic.
The role of the different oxygen species in catalytic oxidation processes has been extensively discussed and a rigorous discussion on the topic can be found in [91].
Understanding of this "extrinsic size effect" at small scales is not yet mature and is currently a topic of rigorous investigations.
"Too few states consider financial literacy essential or rigorous or a scientific topic," she said.
In addition to cellular and molecular damages caused by radiation exposure, the radiation-induced bystander effect (RIBE) is also an important topic of rigorous research.
A systematic review of interventions for family carers of cancer and palliative care patients conducted at the start of this millennium demonstrated that there was a dearth of rigorous inquiry on this topic and consequently limited knowledge regarding the types of interventions likely to be effective in meeting the complex needs of family carers.
The curriculum should be rigorous, covering dozens of topics — from prenatal care to home safety to emotional preparation to parenting to the mother's continuing education.
It is explained that the object of the book is to develop intuitive mathematical understanding rather than to give rigorous development of the topics considered.
