<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">physics</topic></authority><related type="narrower"><topic>geophysics</topic></related><related type="narrower"><topic>applied physics</topic></related><related type="narrower"><topic>acoustics</topic></related><related type="narrower"><topic>particle physics</topic></related><related type="narrower"><topic>hydraulics</topic></related><related type="narrower"><topic>mathematical physics</topic></related><related type="narrower"><topic>mechanics</topic></related><related type="narrower"><topic>nuclear physics</topic></related><related type="narrower"><topic>optics</topic></related><related type="narrower"><topic>radiology</topic></related><related type="narrower"><topic>electronics</topic></related><related type="narrower"><topic>building physics</topic></related><related type="narrower"><topic>photonics</topic></related><related type="other"><topic>physics concepts</topic></related><related type="other"><topic>physicists</topic></related><related type="broader"><topic>physical sciences</topic></related><variant type="other"><topic>natural philosophy</topic></variant><variant type="other"><topic>philosophy, natural</topic></variant> <note xml:lang="en"><![CDATA[ Science that studies the laws determining the structure of the observable universe and the interaction between its fundamental constituents, such as matter and energy, with the broad goal of explaining natural phenomena. ]]></note></mads>