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Stringy Neutralino Dark Matter in Light of CDMSII
James A. Maxin, Van E. Mayes, D. V. Nanopoulos
Recently, the CDMS experiment has reported the possible first direct-detection of dark matter. We update the direct-detection constraints for neutralino dark matter arising in a re…
D-Foam Phenomenology: Dark Energy, the Velocity of Light and a Possible D-Void
John Ellis, Nick E. Mavromatos, Dimitri V. Nanopoulos
In a D-brane model of space-time foam, there are contributions to the dark energy that depend on the D-brane velocities and on the density of D-particle defects. The latter may als…
A Note on Modulus-dominated SUSY-breaking
James A. Maxin, Van E. Mayes, D. V. Nanopoulos
In models where supersymmetry-breaking is dominated by the Kahler moduli and/or the universal dilaton, the B-parameter at the unification scale should be consistent with the value…
Hitchin Equation, Singularity, and N=2 Superconformal Field Theories
Dimitri Nanopoulos, Dan Xie
We argue that Hitchin's equation determines not only the low energy effective theory but also describes the UV theory of four dimensional N=2 superconformal field theories when we…
Fast Proton Decay
Tianjun Li, Dimitri V. Nanopoulos, Joel W. Walker
We consider proton decay in the testable flipped SU(5) X U(1)_X models with TeV-scale vector-like particles which can be realized in free fermionic string constructions and F-theor…
On Crossing Symmmetry and Modular Invariance in Conformal Field Theory and S Duality in Gauge Theory
Dimitri Nanopoulos, Dan Xie
In this note, we explore the relation between crossing symmetry and modular invariance in conformal field theory and S-duality in gauge theory. It is shown that partition functions…
N=2 SU Quiver with USP Ends or SU Ends with Antisymmetric Matter
Dimitri Nanopoulos, Dan Xie
We consider the four dimensional scale invariant N=2 SU quiver gauge theories with USp(2N) ends or SU(2N) ends with antisymmetric matter representations. We argue that these theori…
The Search for a Realistic String Model at LHC
James A. Maxin, Van E. Mayes, D. V. Nanopoulos
We survey the low-energy supersymmetry phenomenology of a three-family Pati-Salam model constructed from intersecting D6-branes in Type IIA string theory on the T^6/(Z_2 x Z_2) ori…
Quark Masses from Gaugino Condensation in String Theories
Christos Kokorelis, Van E. Mayes, Dimitri V. Nanopoulos
We present a mechanism able to generate the perturbatively absent up/down quark Yukawa couplings of SU(5)/flipped SU(5) GUTS in Type II…
Flipped SU(5) X U(1)_X Models from F-Theory
Jing Jiang, Tianjun Li, Dimitri V. Nanopoulos +1
We systematically construct flipped SU(5) X U(1)_X models without and with bulk vector-like particles from F-theory. To realize the decoupling scenario, we introduce sets of vector…
Stringy WIMP Detection and Annihilation
James A. Maxin, Van E. Mayes, Dimitri V. Nanopoulos
We calculate the direct dark matter detection spin-independent and proton spin-dependent cross-sections for a semi-realistic intersecting D6-brane model. The cross-sections are com…
MSSM-like AdS Flux Vacua with Frozen Open-string Moduli
Ching-Ming Chen, Tianjun Li, Van Eric Mayes +1
We construct supersymmetric Pati-Salam flux vacua in AdS from intersecting D6-branes on T^6/(Z_2 x Z_2'). The models constructed have three generations of MSSM matter plus right-ha…
Time Delays of Strings in D-particle Backgrounds and Vacuum Refractive Indices
Tianjun Li, Nick E. Mavromatos, Dimitri V. Nanopoulos +1
Using standard techniques in string/D-brane scattering amplitude computations, we evaluate the scattering of open strings off D-particles in brane world scenarios. The D-particles…
The MAGIC of SSC and how it affects LHC
Nick E. Mavromatos, D. V. Nanopoulos
We discuss the phenomenology of Supercritical String Cosmology (SSC) in the context of Dark Matter constraints on supersymmetric particle physics models at LHC. We also link our re…
Probing a Possible Vacuum Refractive Index with Gamma-Ray Telescopes
John Ellis, N. E. Mavromatos, D. V. Nanopoulos
We have used a stringy model of quantum space-time foam to suggest that the vacuum may exhibit a non-trivial refractive index depending linearly on gamma-ray energy: eta -1 ~ E_gam…