21,171 research outputs found
Conductivity and Dissociation in Metallic Hydrogen: Implications for Planetary Interiors
Liquid metallic hydrogen (LMH) was recently produced under static compression
and high temperatures in bench-top experiments. Here, we report a study of the
optical reflectance of LMH in the pressure region of 1.4-1.7 Mbar and use the
Drude free-electron model to determine its optical conductivity. We find static
electrical conductivity of metallic hydrogen to be 11,000-15,000 S/cm. A
substantial dissociation fraction is required to best fit the energy dependence
of the observed reflectance. LMH at our experimental conditions is largely
atomic and degenerate, not primarily molecular. We determine a plasma frequency
and the optical conductivity. Properties are used to analyze planetary
structure of hydrogen rich planets such as Jupiter
Limiting velocities as running parameters and superluminal neutrinos
In the context of theories where particles can have different limiting
velocities, we review the running of particle speeds towards a common limiting
velocity at low energy. Motivated by the recent OPERA experimental results, we
describe a model where the neutrinos would deviate from the common velocity by
more than do other particles in the theory, because their running is slower due
to weaker interactions.Comment: 5 pages, 3 figure
Gauge non-invariance as tests of emergent gauge symmetry
We motivate the concept of emergent gauge symmetry and discuss ways that this
concept can be tested. The key idea is that if a symmetry is emergent, one
should look for small violations of this symmetry because the underlying
fundamental theory does not contain the symmetry. We describe our recent work
implementing this idea in the gravity sector. We also describe the reasons why
violations of gauge symmetry may well be linked to violations of Lorentz
invariance.Comment: 5 pages, Invited talk presented at the Fifth Meeting on CPT and
Lorentz Symmetry, Bloomington, Indiana, June 28-July 2, 201
Residual theory, partial adjustment, and information content on dividend payments decisions : an integration and extension / BEBR No. 760
Bibliography: p. 31-32
TARGETING MULTI-DRUG RESISTANT PATHOGENS WITH NOVEL ANTIMICROBIAL PEPTIDES
The emergence of antibiotic resistance is a notorious problem worldwide. In the United States alone, antibiotic-resistant bacteria infect at least two million people and kill around 23,000 patients each year. Half of these infections are attributed to the bacterial pathogen, methicillin resistant Staphylococcus aureus (MRSA) according to a report published in 2013 by the Centers for Disease Control and Prevention (CDC). Similarly, S. pseudintermedius is a leading cause of opportunistic infections in pet animals and has zoonotic potential. Furthermore, the marked increase in the incidence of infections due to extensively drug-resistant and pandrug-resistant isolates of Pseudomonas aeruginosa and Acinetobacter baumannii presents an alarming challenge that necessitates the development of novel therapeutic alternatives to traditional antibiotics in order to address this scourge
- …