We study precision electroweak constraints within a RS1 model with gauge fields and fermions in the bulk. The electroweak gauge symmetry is enhanced to SU(2) L × SU(2) R × U(1) B−L , thereby providing a custodial isospin symmetry sufficient to suppress excessive contributions to the T parameter. We then construct complete models, complying with all electroweak constraints, for solving the hierarchy problem, without supersymmetry or large hierarchies in the fundamental couplings. Using the AdS/CFT correspondence our models can be interpreted as dual to a strongly coupled conformal Higgs sector with global custodial isospin symmetry, gauge and fermionic matter being fundamental fields external to the CFT. This scenario has interesting collider signals, distinct from other RS models in the literature.

Thermal recording using a dielectric as a recording material was examined to make a high-density optical disc master. We confirmed that a pit of 53 nm length was able to be recorded with a laser of 405 nm wavelength. As a result we could make a master with a 200 gigabyte (GB) data capacity with a conventional laser beam recorder (LBR). A 100 GB disc made by the same method was able to be read with a tester equipped with a solid immersion lens (SIL) and the measured jitter value was 9.9%. #

We optimized the silicon master structure with the dielectric material as the recording material of the thermal recording. We confirmed that a 48-nm-long pit was able to be recorded with a laser of 405 nm wavelength. As a result of that, we could make a 250 gigabyte (GB) data capacity master with a conventional laser beam recorder (LBR). 75 and 100 GB discs with a photopolymer cover film made by the same method were able to be read with a solid immersion lens (SIL)-equipped tester. The 75 and 100 GB disc jitter values were 6 and 10%, respectively. We also confirmed that a 37-nm-long pit could be formed with the SIL-equipped tester as the recording machine of the thermal recording.

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