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Full-Text Articles in Physics
Baryons Still Trace Dark Matter: Probing Cmb Lensing Maps For Hidden Isocurvature, Tristan L. Smith, J. B. Muñoz, Rhiannon Smith , '17, Kyle Yee , '19, D. Grin
Baryons Still Trace Dark Matter: Probing Cmb Lensing Maps For Hidden Isocurvature, Tristan L. Smith, J. B. Muñoz, Rhiannon Smith , '17, Kyle Yee , '19, D. Grin
Physics & Astronomy Faculty Works
Compensated isocurvature perturbations (CIPs) are primordial fluctuations that balance baryon and dark-matter isocurvature to leave the total matter density unperturbed. The effects of CIPs on the cosmic microwave background (CMB) anisotropies are similar to those produced by weak lensing of the CMB: smoothing of the power spectrum and generation of non-Gaussian features. Here, an entirely new CIP contribution to the standard estimator for the lensing-potential power spectrum is derived. Planck measurements of the temperature and polarization power spectrum, as well as estimates of CMB lensing, are used to place limits on the variance of the CIP fluctuations on CMB scales, …
Deposition And Drying Dynamics Of Liquid Crystal Droplets, Z. S. Davidson, Y. Huang, A. Gross, A. Martinez, T. Still, C. Zhou, Peter J. Collings, R. D. Kamien, A. G. Yodh
Deposition And Drying Dynamics Of Liquid Crystal Droplets, Z. S. Davidson, Y. Huang, A. Gross, A. Martinez, T. Still, C. Zhou, Peter J. Collings, R. D. Kamien, A. G. Yodh
Physics & Astronomy Faculty Works
Drop drying and deposition phenomena reveal a rich interplay of fundamental science and engineering, give rise to fascinating everyday effects (coffee rings), and influence technologies ranging from printing to genotyping. Here we investigate evaporation dynamics, morphology, and deposition patterns of drying lyotropic chromonic liquid crystal droplets. These drops differ from typical evaporating colloidal drops primarily due to their concentration-dependent isotropic, nematic, and columnar phases. Phase separation occurs during evaporation, and in the process creates surface tension gradients and significant density and viscosity variation within the droplet. As a result, the drying multiphase drops exhibit different convective currents, drop morphologies, and …
Sensitivity To A Frequency-Dependent Circular Polarization In An Isotropic Stochastic Gravitational Wave Background, Tristan L. Smith, R. Caldwell
Sensitivity To A Frequency-Dependent Circular Polarization In An Isotropic Stochastic Gravitational Wave Background, Tristan L. Smith, R. Caldwell
Physics & Astronomy Faculty Works
We calculate the sensitivity to a circular polarization of an isotropic stochastic gravitational wave background (ISGWB) as a function of frequency for ground- and space-based interferometers and observations of the cosmic microwave background. The origin of a circularly polarized ISGWB may be due to exotic primordial physics (i.e., parity violation in the early universe) and may be strongly frequency dependent. We present calculations within a coherent framework which clarifies the basic requirements for sensitivity to circular polarization, in distinction from previous work which focused on each of these techniques separately. We find that the addition of an interferometer with the …
Swimming Against The Tide: Gender Bias In The Physics Classroom, Amy Lisa Graves, E. Hoshino-Browne, K. Lui
Swimming Against The Tide: Gender Bias In The Physics Classroom, Amy Lisa Graves, E. Hoshino-Browne, K. Lui
Physics & Astronomy Faculty Works
This study examines physics students’ evaluations of identical, video-recorded lectures performed by female and male actors playing the role of professors. The results indicate that evaluations by male students show statistically significant overall biases with male professors rated more positively than female ones. Female students tended to be egalitarian, except in two areas. Female students evaluated female professors’ interpersonal/communicative skills more positively than male professors’. And they evaluated female professors’ scientific knowledge and skills less positively than that of male professors just as male students did. These findings might be considered based on two notions: rater-ratee similarity bias and stereotype …
Report On The 26th International Liquid Crystal Conference, Peter J. Collings
Report On The 26th International Liquid Crystal Conference, Peter J. Collings
Physics & Astronomy Faculty Works
No abstract provided.