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We consider maximal globally hyperbolic flat (2+1) spacetimes with compact space S of genus g > 1. For any spacetime M of this type, the length of time that the events have been in existence is M defines a global time, called the cosmological time CT of M , which reveals deep intrinsic properties of spacetime. In particular, the past/future asymptoticâ€¦ (More)

For the Abelian Chernâ€“Simons field theory, we consider the quantum functional integration over the Deligneâ€“Beilinson cohomology classes and we derive the main properties of the observables in a generic closed orientable 3-manifold. We present an explicit pathintegral non-perturbative computation of the Chernâ€“Simons link invariants in the case of theâ€¦ (More)

- Enore Guadagnini
- 2008

The low energy scattering of gravitons from a composite extended system, which is made of classical massive bodies, is considered; by using the Feynman rules of effective quantum gravity, the corresponding cross-section is computed to lowest order in powers of the gravitational coupling constant. For the gravitons scattering from a rotating planet or aâ€¦ (More)

- Enore Guadagnini
- 2002

The helicity modification of light polarization which is induced by the gravitational deflection from a classical heavy rotating body, like a star or a planet, is considered. The expression of the helicity asymmetry is derived; this asymmetry signals the gravitationally induced spin transfer from the rotating body to the scattered photons. E-Mail:â€¦ (More)

The structure of the spacetime geometry in (2+1) gravity is described by means of a foliation in which the space-like surfaces admit a tessellation made of polygons. The dynamics of the system is determined by a set of â€™t Hooftâ€™s rules which specify the time evolution of the tessellation. We illustrate how the non-trivial topology of the universe can beâ€¦ (More)

We consider the 3-manifold invariant I(M) which is defined by means of the Chern-Simons quantum field theory and which coincides with the Reshetikhin-Turaev invariant. We present some arguments and numerical results supporting the conjecture that, for nonvanishing I(M) , the absolute value | I(M) | only depends on the fundamental group Ï€1(M) of the manifoldâ€¦ (More)

For the abelian Chern-Simons field theory, we consider the quantum functional integration over the Deligne-Beilinson cohomology classes and we derive the main properties of the observables in a generic closed orientable 3-manifold. We present an explicit pathintegral non-perturbative computation of the Chern-Simons links invariants in the case of theâ€¦ (More)

- Elena Agliari, Claudia Cioli, Enore Guadagnini
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2011

We consider a class of random, weighted networks, obtained through a redefinition of patterns in an Hopfield-like model, and, by performing percolation processes, we get information about topology and resilience properties of the networks themselves. Given the weighted nature of the graphs, different kinds of bond percolation can be studied: stochasticâ€¦ (More)

- Enore Guadagnini
- 2005

For gravitational deflections of massless particles of given helicity from a classical rotating body, we describe the general relativity corrections to the geometric optics approximation. We compute the corresponding scattering cross sections for neutrinos, photons and gravitons to lowest order in the gravitational coupling constant. We find that theâ€¦ (More)

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