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- Julian Barbour, Tim Koslowski, Flavio Mercati
- Physical review letters
- 2014

It is widely believed that special initial conditions must be imposed on any time-symmetric law if its solutions are to exhibit behavior of any kind that defines an "arrow of time." We show that this is not so. The simplest nontrivial time-symmetric law that can be used to model a dynamically closed universe is the Newtonian N-body problem with vanishing… (More)

We present a scale-invariant theory, conformal gravity, which closely resembles the geometro-dynamical formulation of general relativity (GR). While previous attempts to create scale-invariant theories of gravity have been based on Weyl's idea of a compensating field, our direct approach dispenses with this and is built by extension of the method of best… (More)

- Julian Barbour
- 2003

A new and universal method for implementing scale invariance, called best matching, is presented. It extends to scaling the method introduced by Bertotti and the author to create a fully relational dynamics that satisfies Mach's principle. The method is illustrated here in the context of non-relativistic gravitational particle dynamics. It leads to far… (More)

- G S Blum, J S Barbour
- Journal of experimental psychology. General
- 1979

The term selective inattention as used here subsumes those phenomena whose primary function is the active blocking or attenuation of partially processed contents en route to conscious expression. Examples are anxiety-motivated forgetting or perceptual distortion and hypnotically induced negative hallucinations. Studies in the field of selective attention… (More)

- Julian Barbour
- 2008

A review of some basic facts of classical dynamics shows that time, or precisely duration, is redundant as a fundamental concept. Duration and the behaviour of clocks emerge from a timeless law that governs change.

Despite the obvious utility of the concept, it has often been argued that time does not exist. I take the opposite perspective: let's imagine that time does exist, and the universe is described by a quantum state obeying ordinary time-dependent quantum mechanics. Reconciling this simple picture with the known facts about our universe turns out to be a… (More)

- Julian Barbour
- 2008

A new approach to the dynamics of the universe based on work by´O Murchadha, Foster, Anderson and the author is presented. The only kinematics presupposed is the spatial geometry needed to define configuration spaces in purely relational terms. A new formulation of the relativity principle based on Poincaré's analysis of the problem of absolute and relative… (More)

Barbour, Foster and´O Murchadha have recently developed a new framework, called here the 3-space approach, for the formulation of classical bosonic dynamics. Neither time nor a locally Minkowskian structure of spacetime are presupposed. Both arise as emergent features of the world from geodesic-type dynamics on a space of 3-dimensional metric–matter… (More)

- Julian Barbour
- 1992

Dynamical systems of a new kind are described. These are based on the ex-tremization of a non-local and non-additive quantity that we call the variety of a system. In these systems all dynamical quantities are relational, and particles have properties, and can be identified, only through the values of these relational quantities. The variety then measures… (More)

- Julian Barbour
- 2012

According to reductionism, every complex phenomenon can and should be explained in terms of the simplest possible entities and mechanisms. The parts determine the whole. This approach has been an outstanding success in science, but this essay will point out ways in which it could nevertheless be giving us wrong ideas and holding back progress. For example ,… (More)