<?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">physicists</topic></authority><related type="narrower"><topic>nuclear physicists</topic></related><related type="narrower"><topic>particle physicists</topic></related><related type="narrower"><topic>geophysicists</topic></related><related type="narrower"><topic>acousticians</topic></related><related type="narrower"><topic>opticists</topic></related><related type="narrower"><topic>mathematical physicists</topic></related><related type="other"><topic>physics</topic></related><related type="broader"><topic>scientists</topic></related><variant type="other"><topic>physicist</topic></variant><variant type="other"><topic>physicist&apos;s</topic></variant><variant type="other"><topic>physicists&apos;</topic></variant> <note xml:lang="en"><![CDATA[ Scientists trained in or working with 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>