3,939 research outputs found
Diffractive Optics for Gravitational Wave Detectors
All-reflective interferometry based on nano-structured diffraction gratings
offers new possibilities for gravitational wave detection. We investigate an
all-reflective Fabry-Perot interferometer concept in 2nd order Littrow mount.
The input-output relations for such a resonator are derived treating the
grating coupler by means of a scattering matrix formalism. A low loss
dielectric reflection grating has been designed and manufactured to test the
properties of such a grating cavity
The effects of an extra U(1) axial condensate on the radiative decay eta' --> gamma gamma at finite temperature
Supported by recent lattice results, we consider a scenario in which a
U(1)-breaking condensate survives across the chiral transition in QCD. This
scenario has important consequences on the pseudoscalar-meson sector, which can
be studied using an effective Lagrangian model. In particular, generalizing the
results obtained in a previous paper (where the zero-temperature case was
considered), we study the effects of this U(1) chiral condensate on the
radiative decay eta' --> gamma gamma at finite temperature.Comment: 15 pages, LaTeX fil
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