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Contact

Name

Antonio De Felice

Position

Former member
Member from October 2007 to October 2009
Current position: Associate Professor at Yukawa Institute for Theoretical Physics, Kyoto

Personal homepage

http://adefelic.googlepages.com/

Projects

Research directions:

Cosmology and General Relativity

Non-active projects

Extra-dimensions

Christophe Ringeval

It is possible to construct classical models of extra-dimensions based on Field Theory and General Relativity. The goal is to gain deeper understanding into these systems based on tractable and well known theories. In particular, the so-called Randall-Sundrum (RS) models in various dimensions can be modelised as hyper-dimensional topological defects. Our present studies concern the realisation of the Dvali-Gabadadze-Porrati mechanism inside hyper-dimensional monopoles, in which four-dimensional gravity can be obtained by trapping gravitons.

External collaborators: Antonio De Felice (The University of Tokyo, Japan).

Modifications of gravity

Christophe Ringeval

The recent acceleration of the universe is explained in the standard model by the presence of a non-vanishing cosmological constant. However, one may also question the validity of General Relativity on length scales that have never been so accurately tested so far. However, it is not trivial to modify gravity and to build at the same time a model which can survive all the experimental tests. In collaboration with S. Capozziello, we looked for cosmological exact solutions for modifications of gravity in the form f(R) where f possesses a constant of motion during the evolution of the universe. In the future we plan to look for the subset of solutions which can describe experimental data from radiation domination up to today's accelerated expansion.

I have been working also in the so called f(G) gravity. This is a work made in collaboration with Shinji Tsujikawa, which aims to give some necessary conditions for a cosmologically viable f(G) gravity, where G is the Gauss-Bonnet scalar, that is a particular quadratic combination of the Riemann tensor. This scalar, G, has the property that, if not coupled, it can be written as a total derivative. Along with these conditions, we provide also some toy-models which fulfill them.

Publications in IRMP

All my publications on Inspire

Number of publications as IRMP member: 9
Last 5 publications

2010

CP3-10-18: Cosmological perturbation in f(R,G) theories with a perfect fluid.

Antonio De Felice, Jean-Marc Gerard and Teruaki Suyama

[Abstract] [PDF] [Journal] [Dial]
Phys. Rev. D82 (2010) 063526
Refereed paper. May 14.

2009

CP3-09-42: Cosmological perturbations of a perfect fluid and noncommutative variables

Antonio De Felice, Jean-Marc Gerard and Teruaki Suyama

[Abstract] [PDF] [Journal] [Dial]
Published in Physical Review D81 (2010) 063527
Refereed paper. August 25.

CP3-09-32: Scalar mode propagation in modified gravity with a scalar field

Antonio De Felice and Teruaki Suyama

[Abstract] [PDF] [Journal] [Dial]
Published in Physical Review D
Refereed paper. July 31.

CP3-09-30: Solar system constraints on f(G) gravity models

Antonio De Felice and Shinji Tsujikawa

[Abstract] [PDF] [Journal] [Dial]
Published in Physical Review D
Refereed paper. July 13.

CP3-09-16: Vacuum structure for scalar cosmological perturbations in Modified Gravity Models

Antonio De Felice and Teruaki Suyama

[Abstract] [PDF] [Journal] [Dial]
Published in JCAP
Refereed paper. April 14.

More publications

2009

CP3-09-11: Charged seven-dimensional spacetimes with spherically symmetric extra-dimensions

Antonio De Felice and Christophe Ringeval

[Abstract] [PDF] [Journal] [Dial]
Published in Phys. Rev. D79, 123525 (2009)
Refereed paper. April 2.

2008

CP3-08-54: Construction of cosmologically viable f(G) dark energy models

Antonio De Felice and Shinji Tsujikawa

[Abstract] [PDF] [Journal] [Dial]
Published in Physics Letters B
Refereed paper. November 3.

CP3-08-41: Massive gravitons trapped inside a hypermonopole

Antonio De Felice and Christophe Ringeval

[Abstract] [PDF] [Journal] [Dial]
Published in Physics Letters B 671, 158-161 (2009)
Refereed paper. September 2.

CP3-08-24: f(R) cosmology by Noether's symmetry

Antonio De Felice, Salvatore Capozziello

[Abstract] [PDF] [Journal] [Dial]
JCAP0808(2008)016
Refereed paper. June 27.