Giulia Gubitosi

CMB Polarization Systematics, Cosmological Birefringence and the Gravitational Waves Background (2009)

Pagano, Luca, De Bernardis, Paolo, De Troia, Grazia, Gubitosi, Giulia, Masi, Silvia, Melchiorri, Alessandro, ...

Cosmic Microwave Background experiments must achieve very accurate calibration of their polarization reference frame to avoid biasing the cosmological parameters. In particular, a wrong or inaccurate...

A Constraint on Planck-scale Modifications to Electrodynamics with CMB polarization data (2009)

Gubitosi, Giulia, Pagano, Luca, Amelino-Camelia, Giovanni, Melchiorri, Alessandro, Cooray, Asantha

We show that the Cosmic Microwave Background (CMB) polarization data gathered by the BOOMERanG 2003 flight and WMAP provide an opportunity to investigate {\it in-vacuo} birefringence, of a type...

Discreteness of area in noncommutative space (2008)

Amelino-Camelia, Giovanni, Gubitosi, Giulia, Mercati, Flavio

We introduce an area operator for the Moyal noncommutative plane. We find that the spectrum is discrete, but, contrary to the expectation formulated by other authors, not characterized by a...

On the distance observable in the Moyal plane and in a novel two-dimensional space with string-theory pregeometry (2008)

Amelino-Camelia, Giovanni, Gubitosi, Giulia, Mercati, Flavio

Motivation for the study of spacetime noncommutativity comes primarily from its possible use in investigations of (Planck-scale) spacetime fuzziness, but most work focuses on S-matrix/field-theory...

First results of the Noether theorem for Hopf-algebra spacetime symmetries (2007)

Amelino-Camelia, Giovanni, Gubitosi, Giulia, Marciano, Antonino, Martinetti, Pierre, Mercati, Flavio, Pranzetti, Daniele, ...

We summarize here the first results obtained using a technique we recently developed for the Noether analysis of Hopf-algebra spacetime symmetries, including the derivation of conserved charges for...

Twisted Hopf symmetries of canonical noncommutative spacetimes and the no-pure-boost principle (2007)

Amelino-Camelia, Giovanni, Briscese, Fabio, Gubitosi, Giulia, Marciano, Antonino, Martinetti, Pierre, Mercati, Flavio

We study the twisted-Hopf-algebra symmetries of observer-independent canonical spacetime noncommutativity, for which the commutators of the spacetime coordinates take the form [x^{mu},x^{nu}]=i...

A no-pure-boost uncertainty principle from spacetime noncommutativity (2007)

Amelino-Camelia, Giovanni, Gubitosi, Giulia, Marcianó, Antonino, Martinetti, Pierre, Mercati, Flavio

We study boost and space-rotation transformations in kappa-Minkowski noncommutative spacetime, using the techniques that some of us had previously developed (hep-th/0607221) for a description of...