217 research outputs found
Self-Dual Spin-3 And 4 Theories
We present self-dual spin-3 and 4 actions using relevant dreibein fields.
since these actions start with a Chern-Simons like kinetic term (and therefore
cannot be obtained through dimensional reduction) one might wonder whether they
need the presence of auxiliary ghost-killings fields. It turns out that they
must contain, also in this three dimensional case, auxiliary fields. They do
not break self-duality: their free actions do not contain kinetic second order
terms.Comment: 10, IC/91-20
Bosonic Massless Higher Spin Fields from Matrix Model
We study matrix models as a new approach to formulate massless higher spin
gauge field theory. As a first step in this direction, we show that the free
equation of motion of bosonic massless higher spin gauge fields can be derived
from that of a matrix model.Comment: 19pages, no figures, one reference adde
Second Law Violations in Lovelock Gravity for Black Hole Mergers
We study the classical second law of black hole thermodynamics, for Lovelock
theories (other than General Relativity), in arbitrary dimensions. Using the
standard formula for black hole entropy, we construct scenarios involving the
merger of two black holes in which the entropy instantaneously decreases. Our
construction involves a Kaluza-Klein compactification down to a dimension in
which one of the Lovelock terms is topological. We discuss some open issues in
the definition of the second law which might be used to compensate this entropy
decrease.Comment: 15 pages, 1 figure, v2 Title change & minor revisions to match
published version, v3 fixed accidental deletion of author name
Non-abelian self-duality from self-interaction
The non-abelian self-dual action in three dimensions is derived using the
self-interaction mechanism.Comment: Latex, 7 page
Improvement of measurement accuracy in SU(1,1) interferometers
We consider an SU(1,1) interferometer employing four-wave mixers that is fed
with two-mode states which are both coherent and intelligent states of the
SU(1,1) Lie group. It is shown that the phase sensitivity of the interferometer
can be essentially improved by using input states with a large photon-number
difference between the modes.Comment: LaTeX, 5 pages, 1 figure (compressed PostScript, available at
http://www.technion.ac.il/~brif/graphics/interfer_graph/qopt.ps.gz ). More
information on http://www.technion.ac.il/~brif/science.htm
The mass of the graviton and the cosmological constant
We show that the graviton acquires a mass in a de Sitter background given by
This is precisely the fine-tuning value required for
the perturbed gravitational field to mantain its two degrees of freedom.Comment: Title changed and few details added, without any changes in the
conclusio
A note on spin two fields in curved backgrounds
We reconsider the consistency constraints on a free massless symmetric, rank
2, tensor field in a background and confirm that they uniquely require it to be
the linear deviation about (cosmological) Einstein gravity. Neither adding
non-minimal higher derivative terms nor changing the gauge transformations by
allowing terms non-analytic in the cosmological constant alters this fact.Comment: 5 pages - Minor misprints corrected - Version accepted by Class.
Quant. Gra
- …