What is the {concept in physics} for {has effect} of {Big Bang}
Name the concept in physics which caused the Big Bang.
 select distinct ?obj where { wd:Q323 wdt:P1542 ?obj . ?obj wdt:P31 wd:Q33104303 } 
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q323> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1542> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q33104303> } 
Name the physics concept that caused the Big Bang.