It would be risky to stake one s reputation on the validity of such a claim. However, as we have seen on earth the energy demands of such a civilization increase rapidly, an advanced civilization would have to dispose of considerable heat that should be detectable by radio telescopes. In addition such a civilization would transmit electromagnetic waves for communication purposes. As, yet neither of these has been observed. Physics is the most basic of the natural sciences.
Some physicists even go as far as claiming that all of science can be reduced to physics.
The aim of physics is to understand and determine the most fundamental laws that govern natural phenomena. For this reason, physicists consider very fundamental and in some ways simplistic, phenomena. Others often criticize such study as being abstract and having little practical value . However, such study is necessary to understand the order that underlies nature. Unfortunately, reducing nature to its most simple elements can be daunting and has the potential for coming across as boring or difficult.