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3. Metric-Affine Gauge Theory of Gravity: Field Equations, Noether Identities, World Spinors, and Breaking of Dilation Invariance

Author

Hehl, F. W., McCrea, J. D., Mielke, E. W., and Ne'eman, Y.

Subjects
General Relativity and Quantum Cosmology, High Energy Physics - Theory
Abstract

In Einstein's gravitational theory, the spacetime is Riemannian, that is, it has vanishing torsion and vanishing nonmetricity (covariant derivative of the metric). In the gauging of the general affine group ${A}(4,R)$ and of its subgroup ${GL}(4,R)$ in four dimensions, energy--momentum and hypermomentum currents of matter are canonically coupled to the one--form basis and to the connection of a metric--affine spacetime with nonvanishing torsion and nonmetricity, respectively. Fermionic matter can be described in this framework by half--integer representations of the $\overline{SL}(4,R)$ covering subgroup. --- We set up a (first--order) Lagrangian formalism and build up the corresponding Noether machinery. For an arbitrary gauge Lagrangian, the three gauge field equations come out in a suggestive Yang-Mills like form. The conservation--type differential identities for energy--momentum and hypermomentum and the corresponding complexes and superpotentials are derived. Limiting cases such as the Einstein--Cartan theory are discussed. In particular we show, how the ${A}(4,R)$ may ``break down'' to the Poincar\'e (inhomogeneous Lorentz) group. In this context, we present explicit models for a symmetry breakdown in the cases of the Weyl (or homothetic) group, the ${SL}(4,R)$, or the ${GL}(4,R)$., Comment: 197 pages

Published
1994
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4. Avoiding degenerate coframes in an affine gauge approach to quantum gravity

Author

Mielke, E. W., McCrea, J. D., Ne'eman, Y., and Hehl, F. W.

Subjects
General Relativity and Quantum Cosmology, High Energy Physics - Theory
Abstract

In quantum models of gravity, it is surmized that configurations with degenerate coframes could occur during topology change of the underlying spacetime structure. However, the coframe is not the true Yang--Mills type gauge field of the translations, since it lacks the inhomogeneous gradient term in the gauge transformations. By explicitly restoring this ``hidden" piece within the framework of the affine gauge approach to gravity, one can avoid the metric or coframe degeneracy which would otherwise interfere with the integrations within the path integral. This is an important advantage for quantization., Comment: 14 pages, Preprint Cologne-thp-1993-H2

Published
1993
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5. Improved Energy-Momentum Currents in Metric-Affine Spacetime

Author

Hecht, Ralf, Hehl, Friedrich W., McCrea, J. Dermott, Mielke, Eckehard W., and Ne'eman, Yuval

Subjects
General Relativity and Quantum Cosmology, High Energy Physics - Theory
Abstract

In Minkowski spacetime it is well-known that the canonical energy-momentum current is involved in the construction of the globally conserved currents of energy-momentum and total angular momentum. For the construction of conserved currents corresponding to (approximate) scale and proper conformal symmetries, however, an improved energy-momentum current is needed. By extending the Minkowskian framework to a genuine metric-affine spacetime, we find that the affine Noether identities and the conformal Killing equations enforce this improvement in a rather natural way. So far, no gravitational dynamics is involved in our construction. The resulting dilation and proper conformal currents are conserved provided the trace of the energy-momentum current satisfies a (mild) scaling relation or even vanishes., Comment: 14pp

Published
1992
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10. Contributor contact details

Author

Whang, S.H., primary, Valiev, R.Z., additional, Tsuji, N., additional, Scudino, S., additional, Eckert, J., additional, Caballero, F.G., additional, García-Mateo, C., additional, Erb, U., additional, Palumbo, G., additional, McCrea, J.L., additional, Louzguine, D.V., additional, Inoue, A., additional, Mann, J.B., additional, Chandrasekar, S., additional, Compton, W.D., additional, Trumble, K.P., additional, Saldana, C., additional, Moscoso, W., additional, Swaminathan, S., additional, Murthy, T.G., additional, Hattar, K., additional, Ko, Y.G., additional, Shin, D.H., additional, Huang, X., additional, Morris, D.G., additional, Gutkin, M.Y., additional, Zhao, Y.H., additional, Lavernia, E.J., additional, Ovid’ko, I.A., additional, Yamakov, V.I., additional, Shaw, L.L., additional, Höppel, H.W., additional, Göken, M., additional, Sergueeva, A., additional, Mukherjee, A., additional, Yin, W., additional, Kim, G.E., additional, Champagne, V.K., additional, Trexler, M., additional, McCrea, J., additional, Okitsu, Y., additional, Torizuka, S., additional, Muramatsu, E., additional, Komatsu, T., additional, Nagayama, S., additional, Tomida, T., additional, Miyata, K., additional, and Nishibata, H., additional

Published
2011
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27. Platelet Protein Phosphorylation

Author

Gerrard, J. M., Friesen, L. L., McCrea, J. M., Israels, S. J., Robinson, P., Westwick, J., editor, Scully, M. F., editor, MacIntyre, D. E., editor, and Kakkar, V. V., editor

Published
1985
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34. The Absolute Bioavailability and Effect of Food on the Pharmacokinetics of Odanacatib: A Stable-Label i.v./Oral Study in Healthy Postmenopausal Women

Author

Zajic, S., primary, Rossenu, S., additional, Hreniuk, D., additional, Kesisoglou, F., additional, McCrea, J., additional, Liu, F., additional, Sun, L., additional, Witter, R., additional, Gauthier, D., additional, Helmy, R., additional, Joss, D., additional, Ni, T., additional, Stoltz, R., additional, Stone, J., additional, and Stoch, S. A., additional

Published
2016
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36. Placebo- and Amitriptyline-Controlled Evaluation of Central Nervous System Effects of the NK1 Receptor Antagonist Aprepitant and Intravenous Alcohol Infusion at Pseudo-Steady State

Author

Beek, E.T. te, Tatosian, D., Majumdar, A., Selverian, D., Klaassen, E.S., Petty, K.J., Gargano, C., Dyck, K. van, McCrea, J., Murphy, G., and Gerven, J.M.A. van

Subjects
aprepitant, alcohol, substance abuse, pharmacodynamics, interaction, addiction, amitriptyline, pharmacokinetics, NK1 receptor
Published
2013

41. Irish association of rheumatology and rehabilitation: Proceedings of the meeting of the irish association of rheumatology and rehabilitation, held on Friday, 9th November, 1984

Author

Comerford, F. R., Reeves, Anthony, Bresnihan, Barry, Gannon, M., Barton, J., Burke, J., Bulger, K., Casey, E., Fitzpatrick, D., Temperley, I. J., Thompson, R. N., Edelman, J., Watts, C., Esdaile, J., Russell, A. S., Thompson, R. N., Wardman, P., Stanley, J. K., Newton, P., Swinburn, W. R., Smith, P., Burke, M., Swinson, D. R., Sarsfield, P., Cafferkey, M., O’Carroll, P., O’Byrne, H., Jagoe, W. S., Casey, E. B., Hassan, J., Whelan, C. A., Colohan, H., Gannon, M., Bloomfield, F. J., Bresnihan, B., Feighery, C., Malone, D. E., McCormick, P. A., Long, A., Jones, B., Bresnihan, B., Molony, J., O’Donoghue, D. P., Hanly, J., Hassan, J., Moriarty, M., Whelan, A., Feighery, C., Casey, E., Molony, J., Bresnihan, B., Coughlan, R. J., Crisp, A. J., Hazleman, B. L., Parr, G., Page Thomas, D. P., Fay, A. C., Trudgett, A., McCrea, J. D., Kirk, F., Thompson, J. M., Mitchell, E. S., Boyd, M. J. W., Roberts, S. D., and McNeill, T. A.

Published
1985
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42. Irish society of rheumatology and rehabilitation: Meeting held on Friday, 25th November, 1983

Author

Taggart, A. J., Desai, S. M., Iveson, J. M., Verow, P. W., Tolan, M. J., Comerford, F. R., Bresnlhan, Barry, FitzGerald, Oliver, Masterson, James, Templeton, J., Graham, K., Roberts, Stanley, Hassan, J., Hanly, J., Whelan, A., Feighery, C., Bresnihan, B., Casey, E., Colclough, M., Freyne, P., Murphy, A., McNeill, T. A., Shirodaria, P. V., Price, S., Thompson, J., Fay, A., Roberts, S. D., Frazer, Hilary E., Wisdom, G. B., McCrea, J. D., Boyd, M. W. J., Moriarty, M., and Molony, J.

Published
1984
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49. To assess the effect of ridaforolimus on the QTc interval in patients with advanced cancer.

Author

Sullivan, D., primary, Patnaik, A., additional, Papadopoulos, K. P., additional, McCrea, J. B., additional, Cerchio, K., additional, Li, X., additional, Stroh, M., additional, Orford, K. W., additional, Trucksis, M., additional, Ebbinghaus, S., additional, Agrawal, N., additional, Iwamoto, M., additional, Wagner, J. A., additional, and Tolcher, A. W., additional

Published
2011
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50. The translocation of golden perch, Murray cod and Australian bass, into and within Western Australia, for the purposes of recreational stocking, domestic stocking and commercial and non-commercial aquaculture

Author

Gill, H., Morgan, D., Sarre, G., Hambleton, S., Ginbey, B., Bardsley, B., Rowland, S., Thurstan, S., Humphries, P., Pen, L., Cribb, A., Thorne, T., Chalmers, C., Jones, B., Looby, G., McCrea, J., Molony, B., Lenanton, R., Machin, D., Astbury, C., Gill, H., Morgan, D., Sarre, G., Hambleton, S., Ginbey, B., Bardsley, B., Rowland, S., Thurstan, S., Humphries, P., Pen, L., Cribb, A., Thorne, T., Chalmers, C., Jones, B., Looby, G., McCrea, J., Molony, B., Lenanton, R., Machin, D., and Astbury, C.

Abstract

This discussion paper has been prepared to provide information to assist in assessment of the possible impact of the translocation of golden perch (Macquaria ambigua), Murray cod (Maccullochella peelii peelii) and Australian bass (Macquaria novemaculeata) into and within Western Australia, for the purposes of recreational stocking, domestic stocking, commercial and non-commercial aquaculture. In assessing the translocation of any aquatic species, economic and social benefits must be balanced with biological and environmental risks.

Published
2003

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