37 citations · 116 across the 7 of their papers we have counts for
9 papers
Prediction accuracy and sloppiness of log-periodic functions
David Brée, Damien Challet, Pier Paolo Peirano
We show that log-periodic power-law (LPPL) functions are intrinsically very hard to fit to time series. This comes from their sloppiness, the squared residuals depending very much…
The Ups and Downs of Modeling Financial Time Series with Wiener Process Mixtures
Damien Challet, Pier Paolo Peirano
Starting from inhomogeneous time scaling and linear decorrelation between successive price returns, Baldovin and Stella recently proposed a way to build a model describing the time…
Functional integration for Regge gravity
Pietro Menotti, Pier Paolo Peirano
A summary is given of recent exact results concerning the functional integration measure in Regge gravity.
Functional integration on Regge geometries
Pietro Menotti, Pier Paolo Peirano
We adopt the standard definition of diffeomorphism for Regge gravity in D=2 and give an exact expression of the Liouville action in the discretized case. We also give the exact for…
Diffeomorphism invariant measure for finite dimensional geometries
Pietro Menotti, Pier Paolo Peirano
We consider families of geometries of D--dimensional space, described by a finite number of parameters. Starting from the De Witt metric we extract a unique integration measure whi…
Functional integration on two dimensional Regge geometries
Pietro Menotti, Pier Paolo Peirano
By adopting the standard definition of diffeomorphisms for a Regge surface we give an exact expression of the Liouville action both for the sphere and the torus topology in the dis…
Conformal gauge fixing and Faddeev-Popov determinant in 2-dimensional Regge gravity
Pietro Menotti, Pier Paolo Peirano
By regularizing the conical singularities by means of a segment of a sphere or pseudosphere and then taking the regulator to zero, we compute exactly the Faddeev--Popov determinant…
2-dimensional Regge gravity in the conformal gauge
Pietro Menotti, Pier Paolo Peirano
By restricting the functional integration to the Regge geometries, we give the discretized version of the well known path integral formulation of 2--dimensional quantum gravity in…
Faddeev-Popov determinant in 2-dimensional Regge gravity.
Pietro Menotti, Pier Paolo Peirano
By regularizing the singularities appearing in the two dimensional Regge calculus by means of a segment of a sphere or pseudo-sphere and then taking the regulator to zero, we obtai…