6,293,738 research outputs found
Exterior view of the A. G. Healing Ltd. factory, Sydney, New South Wales [picture] /
No full textTitle devised by cataloguer from accompanying documentation.; Part of the Collection of photographs of Sydney by A.G. Foster.; Condition: Good.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-vn3064345
Hamiltonian gravity with variable G,Lambda from the renormalization group
No full textModels of gravity with variable G and Lambda have
acquired greater relevance after the recent evidence in favour of
the Einstein theory being non-perturbatively renormalizable. The
present paper applies the Arnowitt-Deser-Misner formalism and
the Dirac-Bergmann theory of constrained Hamiltonian systems to
such a class of gravitational models. A modified action functional
is then built that reduces to the Einstein-Hilbert action when
G is constant, and leads to a linear growth of the scale factor
when gravity is coupled to a massless self-interacting phi^{4}
theory in a Universe with Friedmann-Lemaitre-Robertson-Walker
symmetry, in agreement with the recently developed fixed-point
cosmology. Interestingly, our modified action functional makes it
necessary to consider an external field that decays as the inverse of
the sixth power of cosmological time in the early universe, although the
relevant solutions are actually independent of the strength of this new
field
Discrete breathers and negative-temperature states
No full textWe explore the statistical behaviour of the discrete nonlinear Schrödinger equation as a test bed for the observation of negative-temperature (i.e. above infinite temperature) states in Bose–Einstein condensates in optical lattices and arrays of optical waveguides. By monitoring the microcanonical temperature, we show that there exists a parameter region where the system evolves towards a state characterized by a finite density of discrete breathers and a negative temperature. Such a state persists over very long (astronomical) times since the convergence to equilibrium becomes increasingly slower as a consequence of a coarsening process. We also discuss two possible mechanisms for the generation of negative-temperature states in experimental setups, namely, the introduction of boundary dissipations and the free expansion of wavepackets initially in equilibrium at a positive temperature
G. Rollie White Coliseum - 13
No full textBuildings: G. Rollie White ColiseumTwo students walk by a window in G. Rollie White at a girls basketball game
Elevator runners used in a silo [picture] /
No full textTitle devised by cataloguer from accompanying documentation.; Part of the Collection of photographs of Sydney by A.G. Foster.; Condition: Good.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-vn3077395
Baptismal font in a church [picture] /
No full textTitle devised by cataloguer from accompanying documentation.; Part of the Collection of photographs of Sydney by A.G. Foster.; Condition: Silvering.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-vn3075066
Front of a school building [picture] /
No full textTitle devised by cataloguer from accompanying documentation.; Part of the Collection of photographs of Sydney by A.G. Foster.; Condition: Silvering.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-vn3072018
G. Rollie White Coliseum - 2
No full textBuildings: G. Rollie White ColiseumDedication of G. Rollie White ColiseumG. Rollie White (right
Unidentified construction crew on a building site [7] [picture] /
No full textTitle devised by cataloguer from accompanying documentation.; Part of the Collection of photographs of Sydney by A.G. Foster.; Condition: Good.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-vn3077436
Construction workers on a building next to Phillip House [picture] /
No full textTitle devised by cataloguer from accompanying documentation.; Part of the Collection of photographs of Sydney by A.G. Foster.; Condition: Silvering.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-vn3064630
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