bre cht ▁is ▁a ▁Fellow ▁of ▁the ▁American ▁Phys ical ▁Society ▁and ▁Fellow ▁of ▁the ▁Institute ▁of ▁Physics ▁( UK ). ▁ ▁Work ▁T ogether ▁with ▁his ▁th esis ▁ad visor , ▁Al bre cht ▁developed ▁New ▁In fl ation , ▁solving ▁the ▁b ubble ▁collision ▁problem ▁of ▁Alan ▁G uth ' s ▁original ▁model ▁of ▁infl ation . ▁Later , ▁Al bre cht ▁studied ▁the ▁observable ▁effects ▁of ▁cos mic ▁topological ▁defect s , ▁contrib uting ▁to ▁r uling ▁out ▁cos mic ▁strings ▁as ▁the ▁dominant ▁mechanism ▁for ▁structure ▁formation . ▁ ▁Al ong ▁with ▁João ▁M ague ijo , ▁Al bre cht ▁independently ▁proposed ▁a ▁model ▁of ▁varying ▁speed ▁of ▁light ▁cosm ology ▁which ▁pos its ▁that ▁the ▁speed ▁of ▁light ▁in ▁the ▁early ▁universe ▁was ▁a ▁tr ill ion ▁times ▁faster ▁in ▁order ▁to ▁explain ▁the ▁horizon ▁problem ▁of ▁cosm ology . ▁ ▁In ▁the ▁ 2 1 st ▁century , ▁Al bre cht ▁worked ▁on ▁quantum ▁mechan ics , ▁as ▁well ▁as ▁probability ▁and ▁quantum ▁theory . ▁ ▁See ▁also ▁ ▁Bol tz mann ▁brain ▁ ▁References ▁ ▁Further ▁reading ▁ ▁External ▁links ▁ ▁U CD ▁Home page ▁ ▁Ted X ▁talk ▁( UC ▁Davis ) ▁ ▁Category : Year ▁of ▁birth ▁missing ▁( l iving ▁people ) ▁Category : L iving ▁people ▁Category : 2 1 st - century ▁American ▁phys ic ists ▁Category : Univers ity ▁of ▁California , ▁Davis ▁fac ulty ▁Category : C orn ell ▁University ▁al umn i ▁Category : Univers ity ▁of ▁Pennsylvania