CPviolation from noncommutative geometry

Gravity From Noncommutative Geometry

We introduce the linear connection in the noncommutative geometry model of the product of continuous manifold and the discrete space of two points. We discuss its metric properties, de ne the metric connection and calculate the curvature. We de ne also the Ricci tensor and the scalar curvature. We nd that the latter di ers from the standard scalar curvature of the manifold by a term, which migh...

Inflationary Cosmology from Noncommutative Geometry

In the framework of the Connes-Lott model based on noncommutative geometry, the basic features of a gauge theory in the presence of gravity are reviewed, in order to show the possible physical relevance of this scheme for inflationary cosmology. These models naturally contain at least two scalar fields, interacting with each other whenever more than one fermion generation is assumed. In this pa...

CP - violation from Noncommutative Geometry ∗

If the geometry of space-time is noncommutative, i.e. [x µ , x ν ] = iθ µν , then noncommutative CP violating effects may be manifest at low energies. For a noncommutative scale Λ ≡ θ −1/2 ≤ 2 T eV , CP violation from noncommutative geometry is comparable to that from the Standard Model (SM) alone: the noncommutative contributions to ǫ and ǫ ′ /ǫ in the K-system, and to sin 2β in the B-system, ...

Noncommutative geometry

Noncommutative Geometry from Strings and Branes

Noncommutative torus compactification of Matrix model is shown to be a direct consequence of quantization of the open strings attached to a D-membrane with a nonvanishing background B field. We calculate the BPS spectrum of such a brane system using both string theory results and DBI action. The DBI action leads to a new transformation property of the compactification radii under the SL(2, Z)N ...