= Steven Weinberg
{c}
{tag=Physicist}
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<Steven Weinberg>'s 1967 lepton model combined the <weak interaction> and <electromagnetic interaction> in a gauge-theory framework. <Spontaneous symmetry breaking> gives different <masses> to the weak vector bosons while leaving the <photon> massless. This joins interactions with very different apparent ranges under a common structure, with their differences arising from the vacuum and couplings. The paper also identifies renormalizability as a crucial consistency question, rather than claiming that all higher-order calculations were already established.<A Model of Leptons by Steven Weinberg>[1967, opening model, symmetry broken by the vacuum and prospective renormalizability]{ref}
A <physicist>.<Professional profile of Steven Weinberg>[Independent professional identity]{ref}
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{title=Portrait of <Steven Weinberg>}
{description=© 2010 Larry D. Moore; Texas Book Festival, Austin. https://creativecommons.org/licenses/by/4.0/[Creative Commons Attribution 4.0 International, as specified on current File page.], via Wikimedia Commons.}
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