554,577 research outputs found
Urban Design of Bristol Waterfront, Lower Thames Street
The marketplace is going to be one of the highlights on Thames Street, serving as a destination for leisure, shopping and dining. The concept of the project is to have indoor space continue out to the water, providing an outdoor space for dining and leisure, but also giving the boardwalk a resting point. The building is planned as two floors, with the fish market and multipurpose area on the first and an eatery, sitting area, balcony and facilities on the second. The building will be made of a light metal frame with panels to enclose the space and is designed with a folded glass panel that can be opened up to the outside, yet decrease wind pressure in a storm
Building flat space-time from information exchange between quantum fluctuations
We consider a hypothesis in which classical space-time emerges from
information exchange (interactions) between quantum fluctuations in the gravity
theory. In this picture, a line element would arise as a statistical average of
how frequently particles interact, through an individual rate
and spatially interconnecting rates . The question is if space-time
can be modelled consistently in this way. The ansatz would be opposite to the
standard treatment of space-time as insensitive to altered physics at event
horizons (disrupted propagation of information) but by extension relate to the
connection of space-time to entanglement (interactions) through the
gauge/gravity duality. We make a first, rough analysis of the implications this
type of quantization would have on the classical structure of flat space-time,
and of what would be required of the interactions. Seeing no obvious reason for
why the origin would be unrealistic, we comment on expected effects in the
presence of curvature.Comment: 22 pages. v3: extended introductio
On Locality in Quantum General Relativity and Quantum Gravity
The physical concept of locality is first analyzed in the special
relativistic quantum regime, and compared with that of microcausality and the
local commutativity of quantum fields. Its extrapolation to quantum general
relativity on quantum bundles over curved spacetime is then described. It is
shown that the resulting formulation of quantum-geometric locality based on the
concept of local quantum frame incorporating a fundamental length embodies the
key geometric and topological aspects of this concept. Taken in conjunction
with the strong equivalence principle and the path-integral formulation of
quantum propagation, quantum-geometric locality leads in a natural manner to
the formulation of quantum-geometric propagation in curved spacetime. Its
extrapolation to geometric quantum gravity formulated over quantum spacetime is
described and analyzed.Comment: Mac-Word file translated to postscript for submission. The author may
be reached at: [email protected] To appear in Found. Phys. vol. 27,
199
Bohr’s quantum postulate and time in quantum mechanics
In this paper I shall consider the concept of time used in the quantum theory from the perspective of
Bohr’s ideas as presented in what he called the quantum postulate and some of its consequences. In
particular, Bohr’s views on the role of the experimental arrangement that defines the context in which we
can consider the state of the quantum system to be defined – and the related interpretation of the quantum
wave function –, enables a view on the time concept being used in the theory that makes compatible the
discontinuous changes in individual physical systems with a continuous description in time of the
behavior of an ensemble of systems. A crucial aspect will be to show that Bohr’s ideas are coherent with
the use of an external classical time
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