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On the structure of the S-matrix in general boundary quantum field theory in curved space
the S-matrix quantum field theory
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2010/12/23
We use the general boundary formulation (GBF) of quantum field theory to compute the S-matrix for a general interacting scalar field in curved spacetime. This S-matrix is obtained as the asymptotic li...
Overlap Valence Quarks on a Twisted Mass Sea
Overlap Valence Quarks Twisted Mass Sea
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2011/1/6
We present the results of an investigation of a mixed action approach of overlap valence and maximally twisted mass sea quarks. Employing a particular matching condition on the pion mass, we analyze t...
Sparticle Spectrum of Large Volume Compactification
Sparticle Spectrum Large Volume Compactification
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2010/12/23
We examine the large volume compactification of Type IIB string theory or its F theory limit and the associated supersymmetry breakdown and soft terms. It is crucial to incorporate the loop-induced m...
Coherent Interaction of a Single Fermion with a Small Bosonic Field
Coherent Interaction Single Fermion Small Bosonic Field
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2010/11/23
We have experimentally studied few-body impurity systems consisting of a single fermionic atom
and a small bosonic eld on the sites of an optical lattice. Quantum phase revival pectroscopy has allow...
Defect-Induced Electron Scattering in Single-Walled Carbon Nanotubes
Defect-Induced Electron Single-Walled Carbon Nanotubes
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2010/11/18
We present a detailed comparison between theoretical predictions on electron scattering processes in metallic single-walled carbon nanotubes with defects and experimental data obtained by scanning tun...
Possible realization of the Exciton Bose Liquid phase in a hard-core boson model with ring-only exchange interactions
Possible realization ring-only exchange interactions
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2010/11/17
We investigate a hard-core boson model with ring-only exchanges on a square lattice, where a K1
term acts on 1×1 plaquettes and a K2 term acts on 1×2 and 2×1 plaquettes, with a goal of realizing a no...
Phase transition to Bose-Einstein condensation for a Bosonic gas confined in a combined trap
Phase transition Bose-Einstein condensation Bosonic gas confined
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2010/11/17
We present a study of phase transition to macroscopic superfluidity for an ultracold bosonic gas confined in a combined trap formed by a one-dimensional optical lattice and a harmonic potential, focu...
Static and dynamic contributions to anomalous chain dynamics in polymer blends
Static dynamic contributions anomalous chain dynamics polymer blends
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2010/11/19
By means of computer simulations, we investigate the relaxation of the Rouse modes in a simple bead-spring model for non-entangled polymer blends. Two different models are used for the fast component,...
Flavor unification, dark matter, proton decay and other observable predictions with low-scale $S_4$ symmetry
Flavor symmetries Grand unification Proton decay Intermediate symmetry
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2011/1/5
We show how gauge coupling unification is successfully implemented through non- supersym-metric GU ×Gf (GU = SU(5), SO(10); Gf = S4 , SO(3)f , SU(3)f ) at the grand unification scale MU > 1015 GeV usi...
Triplet-singlet conversion in ultracold Cs$_2$ and production of ground state molecules
Triplet-singlet conversion ground state molecules
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2010/11/17
We propose a process to convert ultracold metastable Cs$_2$ molecules in their lowest triplet state into (singlet) ground state molecules in their lowest vibrational levels. Molecules are first pumpe...
Controlling double ionization of atoms in intense bichromatic laser pulses
ionization atoms intense bichromatic laser pulses
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2010/11/17
We consider the classical dynamics of a two-electron system subjected to an intense bichromatic linearly polarized laser pulse. By varying the parameters of the field, such as the phase lag and the r...
Towards the optimal energy of the proton driver for a neutrino factory and muon collider
the optimal energy proton driver neutrino factory
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2010/11/16
Cross section data from the HARP experiment for pion production by protons from a tantalum target have been convoluted with the acceptance of the front-end channel for the proposed neutrino factory o...
Disordered, strongly scattering porous materials as miniature multipass gas cells
scattering porous materials miniature multipass gas cells
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2010/11/12
Spectroscopic gas sensing is both a commercial success and a rapidly advancing scientific field. Throughout the years, massive efforts have been directed towards improving detection limits by achievi...
Ultracold Atoms as a Target: Absolute Scattering Cross-Section Measurements
Ultracold Atoms Target Scattering Cross-Section Measurements
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2010/11/12
We report on a new experimental platform for the measurement of absolute scattering cross-sections. The target atoms are trapped in an optical dipole trap and are exposed to an incident particle beam...
Chemical control of the charge state of nitrogen-vacancy centers in diamond
Chemical control of the charge state nitrogen-vacancy centers in diamond
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2010/11/25
We investigate the e ect of surface termination on the charge state of nitrogen vacancy centers,which have been ion-implanted few nanometers below the surface of diamond. We nd that,when changing the...