When matter particles interact they release energy that we can detect in form of x-ray or light. When dark matter particles interacts with matter or dark matter

When matter particles interact they release energy that we can detect in form of x-ray or light. When dark matter particles interacts with matter or dark matter, they don’t seem to release any energy. Their only giving away clue is gravitational effect. If dark matter does exist and can be directly detected then we are looking at very new physics.