Dynamical systems applied to cosmology: Dark energy and modified gravity
- S. Bahamonde, C. Boehmer, S. Carloni, E. Copeland, W. Fang, N. Tamanini
- PhysicsPhysics reports
- 8 December 2017
Quintessence without scalar fields
- S. Capozziello, S. Carloni, A. Troisi
- Physics
- 3 March 2003
The issues of quintessence and cosmic acceleration can be discussed in the framework of theories which do not include necessarily scalar fields. It is possible to define pressure and energy density…
Some remarks on the dynamical systems approach to fourth order gravity
- S. Carloni, A. Troisi, P. Dunsby
- Mathematics
- 4 June 2007
Building on earlier work, we discuss a general framework for exploring the cosmological dynamics of Higher Order Theories of Gravity. We show that once the theory of gravity has been specified, the…
Black holes, gravitational waves and fundamental physics: a roadmap
- L. Barack, V. Cardoso, M. Zilhão
- PhysicsClassical and quantum gravity
- 13 June 2018
The grand challenges of contemporary fundamental physics—dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problem—all involve gravity…
Evolution of density perturbations in f(R) gravity
- S. Carloni, P. Dunsby, A. Troisi
- Physics
- 1 July 2007
We give a rigorous and mathematically well defined presentation of the covariant and gauge invariant theory of scalar perturbations of a Friedmann-Lema\^{\i}tre-Robertson-Walker universe for fourth…
Cost-Sensitive AdaBoost Algorithm for Ordinal Regression Based on Extreme Learning Machine
- A. Riccardi, F. Fernández-Navarro, S. Carloni
- Computer ScienceIEEE Transactions on Cybernetics
- 22 January 2014
The well known stagewise additive modeling using a multiclass exponential (SAMME) boosting algorithm is extended to address problems where there exists a natural order in the targets using a cost-sensitive approach and the adoption of the weighted least squares formulation of the problem has been presented.
Constraining Van der Waals quintessence with observations
- S. Capozziello, V. Cardone, M. Bruni
- Physics
- 21 October 2004
We discuss an alternative approach to quintessence, modifying the usual equation of state of the cosmological fluid in order to see whether going further than the approximation of perfect fluid…
Structure growth in f(R) theories of gravity with a dust equation of state
- K. Ananda, S. Carloni, P. Dunsby
- Physics
- 7 December 2009
We investigate the connection between dark energy and fourth-order gravity by analyzing the behavior of scalar perturbations around a Friedmann–Robertson–Walker background. The evolution equations…
CURVATURE QUINTESSENCE MATCHED WITH OBSERVATIONAL DATA
- S. Capozziello, V. Cardone, S. Carloni, A. Troisi
- Physics
- 1 July 2003
Quintessence issues can be achieved by taking into account higher order curvature invariants into the effective action of gravitational field. Such an approach is naturally related to fundamental…
Cosmological dynamics of Rn gravity
- S. Carloni, P. Dunsby, S. Capozziello, A. Troisi
- Mathematics, Physics
- 11 October 2004
A detailed analysis of dynamics of cosmological models based on Rn gravity is presented. We show that the cosmological equations can be written as a first-order autonomous system and analysed using…
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