Eric A Lord
Articles written in Pramana – Journal of Physics
Volume 3 Issue 1 July 1974 pp 35-43 Cosmic Physics
Creation-field theory from dimensional analysis
A Lagrangian is obtained which is invariant under space-time dependent changes in the units of mass, length and time. It contains two scalar fields, one of which is effectively the Brans-Dicke scalar (varying gravitational constant), while the other can be interpreted as a creation-field.
Volume 3 Issue 6 December 1974 pp 1- Erratum
Volume 4 Issue 4 April 1975 pp 164-170 General Relativity
Conformal invariance and scalar-tensor theories
A new generalisation of Einstein’s theory is proposed which is invariant under conformal mappings. Two scalar fields are introduced in addition to the metric tensor field, so that two special choices of gauge are available for physical interpretation, the ‘Einstein gauge’ and the ‘atomic gauge’. The theory is not unique but contains two adjustable parameters ζ and
Volume 5 Issue 1 July 1975 pp 29-32 General Relativity
On energy-momentum tensors as sourcesof spin-2 fields
The improvement terms in the generalised energy-momentum tensor of Callan, Coleman and Jackiw can be derived from a variational principle if the Lagrangian is generalised to describe coupling between ‘matter’ fields and a spin-2 boson field. The required Lorentz-invariant theory is a linearised version of Kibble-Sciama theory with an additional (generally-covariant) coupling term in the Lagrangian. The improved energy-momentum tensor appears as the source of the spin-2 field, if terms of second order in the coupling constant are neglected.
Volume 29 Issue 4 October 1987 pp 359-368 General Relativity
Poincaré gauge theory from self-coupling
Poincaré gauge theory is derived from a linear theory by the method suggested by Gupta for deriving Einstein’s general relativity from the linear theory of a spin-2 field. Non-linearity is introduced by requiring that a set of tensor fields be coupled to the Noether currents of the Poincaré group (energy-momentum and spin).
Volume 30 Issue 6 June 1988 pp 511-519 Particle Physics
Spin and mass content of linearized Poincaré gauge theories
A unified gauge theory of massless and massive spin-2 fields is of considerable current interest. The Poincaré gauge theories with quadratic Lagrangian are linearized, and the conditions on the parameters are found which will lead to viable linear theories with massive gauge particles. As well as the 2^{+} massless gravitons coming from the translational gauge potential, the rotational gauge potentials, in the linearized limit, give rise to 2^{+} and 2^{−} particles of equal mass, as well as a massive pseudoscalar.
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