Concept

Orbifold

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Running and matching from 5 to 4 dimensions

Riccardo Rattazzi, Roberto Contino

We study 5-dimensional grand-unified theories in an orbifold geometry by the method of effective field theory: we match the low and high energy theories by integrating out at 1-loop the massive Kaluza-Klein states. In the supersymmetric case the radius dep ...

2002

Target-space anomalies and elliptic indices in heterotic orbifolds

Claudio Scrucca

We present a complete string theory analysis of all mixed gauge, gravitational and target-space anomalies potentially arising in the simplest heterotic Z(N) orbifold models, with N odd and standard embedding. These anomalies turn out to be encoded in an el ...

2001

On the effective action of stable non-BPS branes

Claudio Scrucca

We study the world-volume effective action of stable non-BPS branes present in Type II theories compactified on K3. In particular, by exploiting the conformal description of these objects available in the orbifold limit, we argue that their world-volume ef ...

2000

Anomaly cancellation in K3 orientifolds

Claudio Scrucca

We study in detail the pattern of anomaly cancellation in D = 6 Type IIB Z(N) orientifolds, occurring through a generalized Green-Schwarz mechanism involving several RR antisymmetric tensors and scalars fields. The starting point is a direct string theory ...

2000

Gauge and gravitational anomalies in D=4 N=1 orientifolds

Claudio Scrucca

The cancellation of U(1)-gauge and U(1)-gravitational anomalies in certain D = 4 N = 1 type-IIB orientifolds is analyzed in detail, from a string theory point of view. We verify the proposal that these anomalies are cancelled by a Green-Schwarz mechanism i ...

1999

Black holes as D3-branes on Calabi-Yau threefolds

Claudio Scrucca

We show how an extremal Reissner-Nordstrom black hole can be obtained by wrapping a dyonic D3-brane on a Calabi-Yau manifold. In the orbifold limit T-6/Z(3), We explicitly show the correspondence between the solution of the supergravity equations of motion ...

1998

Interaction of moving D-branes on orbifolds

Claudio Scrucca

We use the boundary state formalism to study the interaction of two moving identical D-branes in the Type II superstring theory compactified on orbifolds. By computing the velocity dependence of the amplitude in the limit of large separation we can identif ...

1997