Concept

History of string theory

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On string models with Scherk-Schwarz supersymmetry breaking

Claudio Scrucca

We construct a general class of chiral four-dimensional string models with Scherk-Schwarz supersymmetry breaking, involving freely acting orbifolds. The basic ingredient is to combine an ordinary supersymmetry-preserving Z(N) projection with a supersymmetr ...

2001

Scherk-Schwarz gauge symmetry breaking of a D-dimensional field theory model compactified on a circle is analyzed. It is explicitly shown that forbidden couplings in the,unbroken theory appear in the one-loop effective action only in a nonlocal way, implyi ...

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

Spin dependent D-brane interactions and scattering amplitudes in matrix theory

Claudio Scrucca

Spin interactions between two moving Dp-branes are analyzed using the Green-Schwarz formalism of boundary states. This approach turns out to be extremely efficient to compute all the spin effects related by supersymmetry to the leading nu(4)/r(7-p) term. A ...

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa1999

Aspects of D-brane dynamics on orbifolds

Claudio Scrucca

We discuss D-brane dynamics in orbifold compactifications of type II superstring theory. We compute the interaction potential between two D-branes moving with constant velocities and give a field theory interpretation of it in the large distance limit. ...

1999

Interaction of D-branes on orbifolds and massless particle emission

Claudio Scrucca

We discuss various D-brane configurations in 4-dimensional orbifold compactifications of type II superstring theory which are point-like 0-branes from the 4-dimensional space-time point of view. We analyze their interactions and compute the amplitude for t ...

World Scientific Publ Co Inc, 687 Hartwell St, Teaneck, Nj 07666 Usa1998

Electric and magnetic interaction of dyonic D-branes and odd spin structure

Claudio Scrucca

We present a general description of electromagnetic RR interactions between pairs of magnetically dual D-branes, focusing on the interaction of a magnetically charged brane with an electrically charged one. In the boundary state formalism, it turns out tha ...

1998

A note on supersymmetric D-brane dynamics

Claudio Scrucca

We study the spin dependence of D-brane dynamics in the Green-Schwarz formalism of boundary states. In particular we show how to interpret insertion of supercharges on the boundary state as sources of non-universal spin effects in D-brane potentials. In th ...

1998

Scale-independent spin effects in D-brane dynamics

Claudio Scrucca

We study spin interactions between two moving D-branes using the Green-Schwarz formalism of boundary states. We focus our attention on the leading terms for small velocities v, of the form v(4-n)/r(7-P+n) (v(2-n)/r(3-p+n)) for p-p (p-p + 4) systems, with 1 ...

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