Results for 'Friedrich W. Hehl'

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  1.  18
    On the Kinematics of the Torsion of Space-Time.Friedrich W. Hehl - 1985 - Foundations of Physics 15 (4):451-471.
    On a macroscopic level we take general relativity as the appropriate theory of space-time and gravity. We will argue that, on a more microscopic level, in the Compton wavelength regime of elementary particles, there are good reasons for suspecting the presence of a torsion of space-time. A corresponding gaugetheoretical formalism related to the Poincaré group is reviewed, and the kinematical consequences of the presence of a torsion are worked out. In particular we discuss the operational meaning and the measurability of (...)
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  2.  27
    An Assessment of Evans' Unified Field Theory I.Friedrich W. Hehl - 2007 - Foundations of Physics 38 (1):7-37.
    Evans developed a classical unified field theory of gravitation and electromagnetism on the background of a spacetime obeying a Riemann-Cartan geometry. This geometry can be characterized by an orthonormal coframe ϑ α and a (metric compatible) Lorentz connection Γ α β . These two potentials yield the field strengths torsion T α and curvature R α β . Evans tried to infuse electromagnetic properties into this geometrical framework by putting the coframe ϑ α to be proportional to four extended electromagnetic (...)
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  3.  38
    An Assessment of Evans' Unified Field Theory II.Friedrich W. Hehl & Yuri N. Obukhov - 2007 - Foundations of Physics 38 (1):38-46.
    Evans attempted to develop a classical unified field theory of gravitation and electromagnetism on the background of a spacetime obeying a Riemann-Cartan geometry. In an accompanying paper I, we analyzed this theory and summarized it in nine equations. We now propose a variational principle for a theory that implements some of the ideas that have been (imprecisely) indicated by Evans and show that it yields two field equations. The second field equation is algebraic in the torsion and we can resolve (...)
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  4.  22
    Bianchi Identities and the Automatic Conservation of Energy-Momentum and Angular Momentum in General-Relativistic Field Theories.Friedrich W. Hehl & J. Dermott McCrea - 1986 - Foundations of Physics 16 (3):267-293.
    Automatic conservation of energy-momentum and angular momentum is guaranteed in a gravitational theory if, via the field equations, the conservation laws for the material currents are reduced to the contracted Bianchi identities. We first execute an irreducible decomposition of the Bianchi identities in a Riemann-Cartan space-time. Then, starting from a Riemannian space-time with or without torsion, we determine those gravitational theories which have automatic conservation: general relativity and the Einstein-Cartan-Sciama-Kibble theory, both with cosmological constant, and the nonviable pseudoscalar model. The (...)
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  5.  13
    Progress in Metric-Affine Gauge Theories of Gravity with Local Scale Invariance.Friedrich W. Hehl, J. Dermott McCrea, Eckehard W. Mielke & Yuval Ne'eman - 1989 - Foundations of Physics 19 (9):1075-1100.
    Einstein's general relativity theory describes very well the gravitational phenomena in themacroscopic world. In themicroscopic domain of elementary particles, however, it does not exhibit gauge invariance or approximate Bjorken type scaling, properties which are believed to be indispensible for arenormalizable field theory. We argue that thelocal extension of space-time symmetries, such as of Lorentz and scale invariance, provides the clue for improvement. Eventually, this leads to aGL(4, R)-gauge approach to gravity in which the metric and the affine connection acquire the (...)
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  6.  48
    On the Chiral Anomaly in Non-Riemannian Spacetimes.Yuri N. Obukhov, Eckehard W. Mielke, Jan Budczies & Friedrich W. Hehl - 1997 - Foundations of Physics 27 (9):1221-1236.
    Thetranslation Chern-Simons type three-formcoframe∧torsion on a Riemann-Cartan spacetime is related to the Nieh-Yan fourform. Following Chandia and Zanelli, two spaces with nontrivial translational Chern-Simons forms are discussed. We then demonstrate, first within the classical Einstein-Cartan-Dirac theory and second in the quantum heat kernel approach to the Dirac operator, how the Nieh-Yan form surfaces in both contexts, in contrast to what has been assumed previously.
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  7.  40
    To Consider the Electromagnetic Field as Fundamental, and the Metric Only as a Subsidiary Field.Friedrich W. Hehl & Yuri N. Obukhov - 2005 - Foundations of Physics 35 (12):2007-2025.
    In accordance with an old suggestion of Asher Peres (1962), we consider the electromagnetic field as fundamental and the metric as a subsidiary field. In following up this thought, we formulate Maxwell’s theory in a diffeomorphism invariant and metric-independent way. The electromagnetic field is then given in terms of the excitation $H = ({\cal H}, {\cal D})$ and the field strength F = (E,B). Additionally, a local and linear “spacetime relation” is assumed between H and F, namely H ~ κ (...)
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  8.  32
    Cartan’s Spiral Staircase in Physics and, in Particular, in the Gauge Theory of Dislocations.Markus Lazar & Friedrich W. Hehl - 2010 - Foundations of Physics 40 (9-10):1298-1325.
    In 1922, Cartan introduced in differential geometry, besides the Riemannian curvature, the new concept of torsion. He visualized a homogeneous and isotropic distribution of torsion in three dimensions (3d) by the “helical staircase”, which he constructed by starting from a 3d Euclidean space and by defining a new connection via helical motions. We describe this geometric procedure in detail and define the corresponding connection and the torsion. The interdisciplinary nature of this subject is already evident from Cartan’s discussion, since he (...)
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  9. Gesetzesstrukturen in verschiedenen Wissenschaften.Friedrich W. Hehl & Christian Heinicke - 2000 - Philosophia Naturalis 37 (2):317-350.
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  10.  6
    Die Makedonische Heeresversammlung: ein Beitrag zum antiken Staatsrecht. By Friedrich Granier. Pp.xiv + 206. Munich: Beck, 1931. 9·50 m. [REVIEW]W. T. W. - 1931 - Journal of Hellenic Studies 51 (2):307-307.
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  11.  14
    Friedrich Nietzsche.J. D. W. - 1979 - Review of Metaphysics 32 (4):768-769.
  12.  8
    History of Mediaeval Political Theory in the WestA. J. Carlyle R. W. Carlyle.C. J. Friedrich - 1952 - Speculum 27 (2):209-209.
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  13.  5
    Friedrich Nietzsche: Wie Die Wahre Welt Endlich Zur Fabel Wurde. [REVIEW]J. D. W. - 1979 - Review of Metaphysics 32 (4):768-769.
    In this concise volume, the author sets himself several tasks. He attempts to provide a general introduction to Nietzsche for educated readers, or for students in need of a reliable summary. Furthermore, he wishes to rescue Nietzsche from the distortions to which he has been subjected as a result of decades of controversy as well as the use and abuse of him by interested parties. Finally, he desires to depict the way Nietzsche "really was" in both his life and his (...)
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  14.  40
    Intuitionistic Uniformity Principles for Propositions and Some Applications.W. Friedrich & H. Luckhardt - 1980 - Studia Logica 39 (4):361 - 369.
    This note deals with the prepositional uniformity principlep-UP: p x N A (p, x) x N p A (p, x) ( species of all propositions) in intuitionistic mathematics.p-UP is implied by WC and KS. But there are interestingp-UP-cases which require weak KS resp. WC only. UP for number species follows fromp-UP by extended bar-induction (ranging over propositions) and suitable weak continuity. As corollaries we have the disjunction property and the existential definability w.r.t. concrete objects. Other consequences are: there is no (...)
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  15.  2
    Fire in the SeaA Test of Time. [REVIEW]Eva Panagiotakopulu, W. Friedrich & S. W. Manning - 2002 - Journal of Hellenic Studies 122:192-193.
  16. Die Sozialen Kernfragen, 1 vol.Eduard von Hartmann & W. Friedrich - 1895 - Revue de Métaphysique et de Morale 3 (2):2-3.
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  17.  14
    The Dilemma of Science.Lawrence W. Friedrich - 1942 - Modern Schoolman 19 (2):39-40.
  18.  13
    Pagasai und Demetrias.A. J. B. W., Friedrich Stahlin, Ernst Meyer & Alfred Heidner - 1935 - Journal of Hellenic Studies 55:242.
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  19.  4
    Das Hellenische Thessalien.A. W. & Friedrich Staehlin - 1925 - Journal of Hellenic Studies 45:153.
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  20. Instructional Communication Research.G. W. Friedrich - 1987 - Journal of Thought 22 (4):4-10.
     
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  21.  67
    Arnold's New Latin Course. Parts I. And II. By R. M. Allardyce, M.A. 2 Vols. Pp. 117 and 216 Respectively. Maddox Street, W.: Edward Arnold. July, 1911. Part I., Is. 6d.; Part II., 2s. 6d. [REVIEW]L. P. W. - 1912 - The Classical Review 26 (01):32-.
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  22.  59
    Falernian Grapes (VVvac Falernae). An Inaugural Address on Horace by Professor R. S. Conway, with Six Short Papers by Members of the Leeds Branch of the Classical Association. Edited with a Postscript by W. Rhys Roberts. Cambridge University Press, 1917. [REVIEW]H. D. R. W. - 1917 - The Classical Review 31 (01):30-31.
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  23.  61
    Die Wolken des Aristophanes Erklärt Von W. S. Teuffel. Zweite Auflage, bearbeitet von Otto Kaehler. Leipzig. B. G. Teubner. 1887. 2 Mk. 70. [REVIEW]W. M. W. - 1888 - The Classical Review 2 (07):205-.
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  24.  71
    Nicodemus Frischlinus: Julius Redivivus. Edited by W. Janell. Lateinische Litteraturdenkmäler des XV. U. XVI Jahrhunderts. Berlin: Weidmann, 1912. M. 5. [REVIEW]H. D. R. W. - 1913 - The Classical Review 27 (05):180-.
  25.  64
    Live Latin Orationes Turn Crewianae Tum Gratulatoriae in Theatro Sheldoniano Plerumque Habitae Auctore W. W. Merry, D.D. Clarendon Press, 1909. Orationes Et Epistolae Cantabrigienses (1876–1909). By J. E. Sandys, Litt.D. Macmillan, 1910. [REVIEW]H. D. R. W. - 1911 - The Classical Review 25 (02):61-.
  26.  62
    The Ancient Trade-Route to India Parthian Stations, by Isidore of Charoux. By W. H. Schoff. Philadelphia: Published by the Commercial Museum. 25 Cents. [REVIEW]H. D. R. W. - 1915 - The Classical Review 29 (04):126-.
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  27.  49
    Book Review:Metaphysics in Modern Times D. W. Gotshalk. [REVIEW]M. M. W. - 1940 - Philosophy of Science 7 (4):507-.
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  28.  59
    Greek Stories The Sunset of the Heroes. By W. M. L. Hutchinson. Illustrated by Herbert Cole. Dent. Greek Legends. By M. A. Hamilton. Illustrated. Clarenden Press. [REVIEW]H. D. R. W. - 1913 - The Classical Review 27 (02):69-.
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  29.  58
    Ante Limen. A New Latin Book for Younger Beginners, Based Upon Limen. By R. H. Rees, B.A., Assistant-Mistress at Ladybarn House School. One Vol. Ground-Plan of the Forum. Pp. 128. Albemarle Street, W.; John Murray. July, 1911. 1s. 6d. [REVIEW]L. P. W. - 1912 - The Classical Review 26 (01):32-33.
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  30.  56
    Book Review:Unresting Cells R. W. Gerard. [REVIEW]M. M. W. - 1941 - Philosophy of Science 8 (3):393-.
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  31.  70
    Papyri Graci Berolinenses Papyri Graeci Berolinenses: W. Schubart. P. F. De' Cavalieri and I. Lietzmann. Specimina Codicum Graecorum.—Tabulae in usum scholarum. Bonn: Marcus and Weber. 1910, 1911. [REVIEW]H. D. R. W. - 1911 - The Classical Review 25 (08):266-.
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  32.  55
    Cities of Italy - A History of Verona. By A. M. Allen. Edited by Edward Armstrong. With 20 Illustrations and 3 Maps. Methuen. - A History of Perugia. By W. Heywood. Edited by R. L. Douglas. With 21 Illustrations. States of Italy: Methuen. - Roman Cities in Italy and Dalmatia. By A. L. Frothingham. With 61 Plates. Murray. [REVIEW]H. D. R. W. - 1911 - The Classical Review 25 (04):122-.
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  33.  57
    Book Review:From Max Weber; Essays in Sociology H. H. Gerth, C. W. Mills. [REVIEW]M. M. W. - 1947 - Philosophy of Science 14 (2):173-.
  34.  49
    Book Review:Statistical Method From the Viewpoint of Quality Control Walter A. Shewhart, W. E. Deming. [REVIEW]M. M. W. - 1940 - Philosophy of Science 7 (3):386-.
  35.  26
    Philosophy and the Civilizing Arts: Essays Presented to Herbert W. Schneider.G. W. - 1976 - Review of Metaphysics 29 (3):563-563.
    For 60 years, Herbert Schneider has been making notable contributions to philosophy. In 1972, at a surprise party for his 80th birthday, friends presented him with a collection of essays on areas of philosophy in which he himself had done pioneering work. These essays, together with five previously published but difficult-to-find papers written by Schneider himself, are included in the present book, along with a biographical sketch of Schneider prepared by the editors and a list of Schneider’s writings. Among the (...)
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  36.  46
    Book Review:The Nature of the Atom G. K. T. Conn; The Nature of Crystals A. G. Ward; The Wave Nature of the Electron G. K. T. Conn; The Cyclotron W. B. Mann. [REVIEW]M. M. W. - 1940 - Philosophy of Science 7 (3):387-.
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  37. Stuttgarter Privatvorlesungen Friedrich W. J. Schelling.Friedrich Wilhelm Joseph von Schelling & Miklós Vetö - 1973 - Bottega D'Erasmo.
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  38. Infinite Autonomy: The Divided Individual in the Political Thought of G. W. F. Hegel and Friedrich Nietzsche.Jeffrey Church (ed.) - 2011 - Pennsylvania State University Press.
    G. W. F. Hegel and Friedrich Nietzsche are often considered the philosophical antipodes of the nineteenth century. In _Infinite Autonomy_, Jeffrey Church draws on the thinking of both Hegel and Nietzsche to assess the modern Western defense of individuality—to consider whether we were right to reject the ancient model of community above the individual. The theoretical and practical implications of this project are important, because the proper defense of the individual allows for the survival of modern liberal institutions in (...)
     
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  39.  25
    "La Filosofia Della Religione in Kant. I: Dal Dogmatismo Teologico Al Teismo Morale ," by Ada Lamacchia; "Stuttgarter Privatvorlesungen," by Friedrich W.J. Schelling, Ed. Miklos Vetö; "Grundlegung der Positiven Philosophie," by Friedrich Wilhelm Joseph Schelling. Ed. Horst Fuhrmans; "Max Scheler," Volume 1: "Fenomenologia E Antropologia Personalistica," and Volume 2: "Filosofia Della Religione," by Giovanni Ferretti. [REVIEW]James Collins - 1975 - Modern Schoolman 52 (4):449-451.
  40.  22
    Friedrich W. Schmidt, "Zum Begriff der Negativität Bei Schelling Und Hegel". [REVIEW]Darrel E. Christensen - 1976 - Journal of the History of Philosophy 14 (2):240.
  41.  22
    The Chaldaean Oracles Friedrich W. Cremer: Die Chaldäischen Orakel und Jamblich De Mysteriis. (Beiträge zur Klassischen Philologie, 26.) Pp. viii+168. Meisenheim (Glan): Anton Hain, 1969. Paper, DM.32. [REVIEW]J. Gwyn Griffiths - 1971 - The Classical Review 21 (01):39-41.
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  42. Friedrich W. Kron: Wissenschaftstheorie für Pädagogen. [REVIEW]Erwin Hufnagel - 2001 - Philosophischer Literaturanzeiger 54 (4).
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  43. Friedrich-W. von Herrmann-Hermeneutische Phanomenologie des Daseins. Bd. 3.Klaus Neugebauer - 2009 - Philosophischer Literaturanzeiger 62 (1):13.
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  44. Friedrich W. Nietzsche, "The Will to Power, Eds. Walter Kaufmann and R. J. Hollingdale. [REVIEW]Harry Neumann - 1968 - Journal of the History of Philosophy 6 (3):301.
     
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  45. NIETZSCHE, Friedrich: The Will to Power, Trans. By W. Kaufmann and R. J. Hollingdale. [REVIEW]W. G. Hesse - 1969 - Australasian Journal of Philosophy 47:412.
     
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  46.  31
    Death and the Hero W.-H. Friedrich: Wounding and Death in the Iliad. Homeric Techniques of Description . Translated by P. Jones and G. Wright. Appendix by K. B. Saunders. Pp. Xviii + 167. London: Duckworth, 2003. Cased, £45. ISBN: 0-7156-2983-. [REVIEW]Mark W. Edwards - 2005 - The Classical Review 55 (01):6-.
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  47.  8
    Contributions Toward a Bibliography of Epictetus. By W. A. Oldfather. A Supplement Edited by M. Harman, with a Preliminary List of Epictetus Manuscripts by W. H. Friedrich and C. U. Faye. Pp. Xviii + 177. Urbana: University of Illinois Press, 1952. $4. [REVIEW]John Ferguson, W. A. Oldfather & M. Harman - 1953 - Journal of Hellenic Studies 73:161-162.
  48. Proceedings of the Seminar on G.W. Friedrich Hegel & Friedrich Engels, National Auditorium, 27-29 November 1970.Georg Wilhelm Friedrich Hegel & Friedrich Engels (eds.) - 1971 - Calcutta, Indo-Gdr Friendship Society.
     
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  49.  20
    W. -H. Friedrich: Gegenwärtige Vergangenheit. Studien zur antiken Literatur und ihrem Nachleben. Pp. 207. Göttingen: Vandenhoeck & Ruprecht, 1999. Paper, DM 60. ISBN: 3-525-25752-X. [REVIEW]J. M. Alonso-Núñez - 2000 - The Classical Review 50 (2):674-674.
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  50.  14
    G.W.F. Hegel, Wissenschaft der Logik. Erster Teil: Die objective Logik. Erster Band: Die Lehre vom Sein . . Hrsg. von Friedrich Hogemann und Walter Jaeschke. Hamburg, Felix Meiner, 1985, pp. ix, 448, DM 148.Hans-Peter Falk, Das Wissen in Hegels ‘Wissenschaft der Logik’, Freiburg/München, Karl Alber, 1983, pp. 198, DM 48. [REVIEW]Robert Bernasconi - 1985 - Hegel Bulletin 6 (2):21-23.
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