Planck 2013&nbsp;<br /> <h2>From the Planck Scale to the Electroweak Scale</h2>

Session

Parallel Session on String Theory

22 May 2013, 14:00

Bonn

Conveners

Parallel Session on String Theory

• Ralph Blumenhagen

Parallel Session on String Theory

• Ralph Blumenhagen

74. Discrete Symmetries in Global MSSM-like D-Brane Models

Gabriele Honecker

22/05/2013, 14:00

Discrete symmetries are usually invoked to explain the absence of baryon- and lepton-number violating operators in the MSSM. In global D-brane models, discrete Z_n symmetries arise as remnants of massive Abelian gauge symmetries. I will discuss the conditions for the existence of Z_n symmetries in intersecting D-brane worlds on orbifold backgrounds. An examplary global model with particle...

75. Neutrino mass textures from String symmetries

George Leontaris

22/05/2013, 14:30

tba

76. The heterotic string on magnetized orbifolds

Stefan Groot Nibbelink

22/05/2013, 15:00

We give an alternative description of the Schoen manifold as the blow-up of a Z_2 × Z_2 orbifold in which one Z_2 factor acts as a roto-translation. Since for this orbifold the fixed tori are only identified in pairs but not orbifolded, four-dimensional chirality can never be obtained using standard techniques alone. This situation is typical for orbifolds that have vanishing Euler number....

77. Inflation in the random SUGRA landscape

Francisco Pedro

22/05/2013, 16:00

tba

78. Moduli Stabilization and Cosmology With Poly-Instanton Corrections

Pramod Shukla

22/05/2013, 16:20

In the context of type IIB orientifold compactifications, we present a new class of Kaehler moduli inflation realized in the LARGE volume scenarios. The inflaton is a Kaehler modulus corresponding to the volume of a so-called "Wilson" divisor which is relevant for supporting the poly-instanton corrections. Further, this standard single-field model is generalized into a two-field model by the...

79. A Zip-Code for Quarks Leptons and Higgs Bosons

Paul Oehlmann

22/05/2013, 16:40

The location of matter fields and the pattern of gauge symmetry in extra dimensions are crucial ingredients for string model building. We analyze realistic MSSM models from the heterotic Z6 Mini-Landscape and extract those properties that are vital for their success. We find that Higgs bosons and the top quark are not localized in extra dimensions and live in the full D=10 dimensional...

80. Where is the PdV term in the first law of black hole thermodynamics?

Brian Dolan

22/05/2013, 17:00

A PdV term is introduced into the first law of black hole thermodynamics, with the volume being defined to be the variable thermodynamically conjugate to the pressure that arises from the cosmological constant. The black hole equation of state then bears a remarkable similarity to the van der Waals equation. The effect of this new term in the equation of state will be explored.

81. R Symmetries from Heterotic Orbifold Compactifications

Damian Kaloni Mayorga Pena

22/05/2013, 17:20

We consider the string theory origin of R-charge conservation laws in heterotic orbifold compactifications, deriving the corresponding string coupling selection rule for factorizable and non-factorizable orbifolds, with prime ordered and non-prime ordered point groups. R-charge conservation arises due to symmetries among the worldsheet instantons that can mediate the couplings. Among our...