Is Architecture is strictly a science concerned with physics?

While physics isn't very important to the day to day activities of an architect, engineering is most definitely integral to the building industry. Since physics is the "heart and soul" of engineering, it is by extension vital to the design and construction of modern buildings.

Modern buildings have very advanced heating and cooling, electrical circuitry, structural design of very unusually shaped buildings, material science, Plumbing (fluid dynamics), and many other aspects that are designed into the building engineering.

Furthermore, physics and engineering research is what provides for the continuing advancement of technology that goes into a building. Modern day examples include technologies aimed at increasing energy efficiency - such as optic systems that sense daylight and automatically adjust the output of artificial lighting in response, photovoltaic cells, batteries for these photovoltaic cells, highly advanced electronics that integrate and optimize multiple building systems together, and cutting edge heating and cooling technologies.

At this level, physics is vital to just about every profession that exists.