119185780
Quantum Stress Tensor Fluctuations of a Conformal Field and Inflationary Cosmology
We discuss the additional perturbation introduced during inflation by quantum stress tensor fluctuations of a conformally invariant field such as the photon. We consider both a kinematical model, which deals only with the expansion fluctuations of geodesics, and a dynamical model which treats the coupling of the stress tensor fluctuations to a scalar inflaton. In neither model do we find any growth at late times, in accordance with a theorem due to Weinberg. What we find instead is a correction which becomes larger the earlier one starts inflation. This correction is non-Gaussian and highly scale dependent, so the absence of such effects from the observed power spectra may imply a constraint on the total duration of inflation. We discuss different views about the validity of perturbation theory at very early times during which currently observable modes are trans-Planckian.
119426946
Fluctuations of quantum radiation pressure in dissipative fluid
Abstract Using the generalized Langevin equations involving the stress tensor approach, we study the dynamics of a perfectly reflecting mirror which is exposed to the electromagnetic radiation pressure by a laser beam in a fluid at finite temperature. Based on the fluctuation–dissipation theorem, the minimum uncertainty of the mirror's position measurement from both quantum and thermal noises effects including the photon counting error in the laser interferometer is obtained in the small time limit as compared with the “standard quantum limit”. The result of the large time behavior of fluctuations of the mirror's velocity in a dissipative environment can be applied to the laser interferometer of the ground-based gravitational wave detector.
117599682
Quantum fluctuations of the stress tensor
117773621
Quantum Stress Tensor Fluctuations and their Physical Effects
We summarize several aspects of recent work on quantum stress tensor fluctuations and their role in driving fluctuations of the gravitational field. The role of correlations and anticorrelations is emphasized. We begin with a review of the properties of the stress tensor correlation function. We next consider some illuminating examples of non‐gravitational effects of stress tensors fluctuations, specifically fluctuations of the Casimir force and radiation pressure fluctuations. We next discuss passive fluctuations of spacetime geometry and some of their operational signatures. These include luminosity fluctuations, line broadening, and angular blurring of a source viewed through a fluctuating gravitational field. Finally, we discuss the possible role of quantum stress tensor fluctuations in the early universe, especially in inflation. The fluctuations of the expansion of a congruence of comoving geodesics grows during the inflationary era, due to non‐cancellation of anticorrelations that would have occurr...
119279483
Gravity Waves from Quantum Stress Tensor Fluctuations in Inflation
We consider the effects of the quantum stress tensor fluctuations of a conformal field in generating gravity waves in inflationary models. We find a non-scale invariant, non-Gaussian contribution which depends upon the total expansion factor between an initial time and the end of inflation. This spectrum of gravity wave perturbations is an illustration of a negative power spectrum, which is possible in quantum field theory. We discuss possible choices for the initial conditions. If the initial time is taken to be sufficiently early, the fluctuating gravity waves are potentially observable both in the CMB radiation and in gravity wave detectors, and could offer a probe of transplanckian physics. The fact that they have not yet been observed might be used to constrain the duration and energy scale of inflation.
124998001
Nonequilibrium backreaction on a moving charge and mirror in quantum fields
116754848
Rotational bands and signature inversion in odd-odd Re-172
High-spin states in the odd-odd Re-172 have been investigated via the Sm-149(Al-27,4ngamma)Re-172 reaction through excitation functions, x-gamma and gamma-gamma coincidence measurements. A level scheme consisting of three rotational bands has been identified for the first time extending the high-spin studies of Asimilar to160 odd-odd nuclei to the currently lightest rhenium isotope. The three bands have been assigned to be built on the pih(11/2)circle timesnui(13/2), pih(9/2)circle timesnui(13/2), and pi1/2(-) [541]circle timesnu1/2(-) [521] configurations according to their rotational properties in quasiparticle alignments, signature splitting, in-band B(M1)/B(E2) ratios, level spacing systematics, band crossing frequencies, as well as the existing knowledge in neighboring nuclei. Low-spin signature inversion has been confirmed in the first two bands due to the observation of signature crossing at high-spin states. The general features of inversion phenomenon in the semidecoupled bands are presented and discussed with reference to theoretical calculations of two quasiparticle plus rotor model including p-n interactions.
93987437
Parameters of the Charge Distribution of Deformed Nuclei
Precise measurements, using a stable high resolution Ge(Li) spectrometer have been made of the K (2P-1S) and L (3d-2P) muonic X-ray spectra of eight even-even rare-earth nuclei: 150Nd, 152Sm, 162Dv, 164Dy, 168Er, 170Er, 182W, 184W, and 186W (1). From these measurements values of the parameters of the nuclear charge density 
 
$$\text{ }\!\!\rho\!\!\text{ }\left( \text{r} \right)\,\text{=}\,\mathop{\text{ }\!\!\rho\!\!\text{ }}_{\text{o}}\,{{\left[ \text{1}\,\text{+}\,\text{exp}\,\frac{\text{r-c}\left[ \text{1+ }\!\!\beta\!\!\text{ }\mathop{\text{Y}}_{\text{20}}\left( \text{ }\!\!\theta\!\!\text{ } \right) \right]}{\text{a}} \right]}^{\text{-1}}}$$ 
 
have been determined.
120538673
A streamer chamber used in a search for double beta decay
Abstract A 53 cm dia., 8 cm deep helium-filled streamer chamber is described. At a field strength of 6.2 kV/cm, streamers extend over the entire space between the plates of the chamber and the particle track is shown by bright, narrow regions in the streamers. The mechanism of electrical breakdown in this mode of operation and other modes was investigated. The streamer theory of Raether correctly predicts breakdown-time and dead-space. Penning effect by impurities in the chamber gas appears to influence discharge development significantly at the low field strengths used in track-projecting chambers but not at the high field strengths used in streamer chambers.
120491282
Accessibility of the stochastic gravitational wave background from magnetars to the interferometric gravitational wave detectors
121147087
The Angular Correlation of Scattered Annihilation Radiation