335,876 research outputs found

    Do the gravitational corrections to the beta functions of the quartic and Yukawa couplings have an intrinsic physical meaning?

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    We study the beta functions of the quartic and Yukawa couplings of General Relativity and Unimodular Gravity coupled to the λϕ4\lambda\phi^4 and Yukawa theories with masses. We show that the General Relativity corrections to those beta functions as obtained from the 1PI functional by using the standard MS multiplicative renormalization scheme of Dimensional Regularization are gauge dependent and, further, that they can be removed by a non-multiplicative, though local, field redefinition. An analogous analysis is carried out when General Relativity is replaced with Unimodular Gravity. Thus we show that any claim made about the change in the asymptotic behaviour of the quartic and Yukawa couplings made by General Relativity and Unimodular Gravity lack intrinsic physical meaning.Comment: 6 pages, 7 figure

    Reconstructing RFRA: The Contested Legacy of Religious Freedom Restoration

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    Almost every member of Congress voted to approve the Religious Freedom Restoration Act of 1993 (RFRA), a bill endorsed by an unprecedented coalition of dozens of religious and civil rights organizations spanning the political and ideological spectrum. President Clinton quipped at the signing ceremony that perhaps only divine intervention could explain such an unusual meeting of the minds: the establishment of “new trust” across otherwise irreconcilable “ideological and religious lines,” he remarked, “shows . . . that the power of God is such that, even in the legislative process, miracles can happen.” The RFRA consensus was especially “miraculous” because the legislation addressed a deeply divisive question: whether and under what circumstances religious objectors should be exempt from generally applicable laws. RFRA’s supporters, both within and outside Congress, would surely have had sharp disagreements about many specific claims for religious exemptions to particular laws. Yet they coalesced around RFRA, which circumvented such disagreements at the retail level by codifying a “cross-cutting” statutory standard that judges would be required to apply to an undifferentiated and unknown array of future claims for exemptions to every generally applicable law in the land

    The Futility of Law and Development: China and the Dangers of Exporting American Law

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    The Most Dangerous Branch

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    Martin McKinsey, Associate Professor of English, travels to Scotland

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    A Wikipedia Literature Review

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    This paper was originally designed as a literature review for a doctoral dissertation focusing on Wikipedia. This exposition gives the structure of Wikipedia and the latest trends in Wikipedia research

    Introduction to Library Trends 42 (3) Winter 1994: Library Finance: New Needs, New Models

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    Chaotic inflation with curvaton induced running

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    While dust contamination now appears as a likely explanation of the apparent tension between the recent BICEP2 data and the Planck data, we will here explore the consequences of a large running in the spectral index as suggested by the BICEP2 collaboration as an alternative explanation of the apparent tension, but which would be in conflict with prediction of the simplest model of chaotic inflation. The large field chaotic model is sensitive to UV physics, and the nontrivial running of the spectral index suggested by the BICEP2 collaboration could therefore, if true, be telling us some additional new information about the UV completion of inflation. However, before we would be able to draw such strong conclusions with confidence, we would first have to also carefully exclude all the alternatives. Assuming monomial chaotic inflation is the right theory of inflation, we therefore explore the possibility that the running could be due to some other less UV sensitive degree of freedom. As an example, we ask if it is possible that the curvature perturbation spectrum has a contribution from a curvaton, which makes up for the large running in the spectrum. We find that this effect could mask the information we can extract about the UV physics. We also study different different models, which might lead to a large negative intrinsic running of the curvaton.Comment: V2: Extended version to appear in PR
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