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Contributions to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Δ</mml:mi><mml:msub><mml:mi>N</mml:mi><mml:mrow><mml:mi>eff</mml:mi></mml:mrow></mml:msub></mml:math> from the dark photon of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>U</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mrow><mml:mi>T</mml:mi><mml:mn>3</mml:mn><mml:mi>R</mml:mi…
We consider the effect on early Universe cosmology of the dark photon associated with the gauging of $U(1{)}_{T3R}$, a symmetry group under which only right-handed Standard Model fermions transform nontrivially. We find that cosmological constraints on this scenario are qualitatively much more severe than on other well-studied cases of a …