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Full-Text Articles in Physical Sciences and Mathematics
Using The Intensity Modulation Index To Test Pulsar Radio Emission Models, Fredrick A. Jenet, Janusz Gil
Using The Intensity Modulation Index To Test Pulsar Radio Emission Models, Fredrick A. Jenet, Janusz Gil
Physics and Astronomy Faculty Publications and Presentations
This Letter explores the possibility of testing pulsar radio emission models by observing pulse-to-pulse intensity modulation. It is shown that a relationship between a pulsar's period, period derivative, and intensity modulation is a natural consequence of at least one theoretical model of radio pulsar emission. It is proposed that other models may also predict a similar correlation. The exact form of the relationship will depend on the model in question. Hence, observations of intensity modulation should be able to determine the validity of the various emission models. In an attempt to search for the predicted dependencies, the modulation properties of …
Gravitational Radiation From Pulsating White Dwarfs, M. Benacquista, D. M. Sedrakian, M. V. Hairapetyan, K. M. Shahabasyan, A. A. Sadoyan
Gravitational Radiation From Pulsating White Dwarfs, M. Benacquista, D. M. Sedrakian, M. V. Hairapetyan, K. M. Shahabasyan, A. A. Sadoyan
Physics and Astronomy Faculty Publications and Presentations
Rotating white dwarfs undergoing quasi-radial oscillations can emit gravitational radiation in a frequency range from 0.1 to 0.3 Hz. Assuming that the energy source for the gravitational radiation comes from the oblateness of the white dwarf induced by the rotation, the strain amplitude is found to be ∼10-27 for a white dwarf at ∼50 pc. The Galactic population of these sources is estimated to be ∼107 and may produce a confusion-limited foreground for proposed advanced detectors in the frequency band between space-based and ground-based interferometers. Nearby oscillating white dwarfs may provide a clear enough signal to investigate white dwarf interiors …
Normal And Lateral Casimir Forces Between Deformed Plates, Thorsten Emig, Andreas Hanke, Ramin Golestanian, Mehran Kardar
Normal And Lateral Casimir Forces Between Deformed Plates, Thorsten Emig, Andreas Hanke, Ramin Golestanian, Mehran Kardar
Physics and Astronomy Faculty Publications and Presentations
The general path-integral formulation was set up for Casimir energy of the electromagnetic gauge field. By separating into transversal electric and magnetic modes, the problem was reduced to two decoupled problems for scalar fields which differ only in their boundary conditions. In each case, the Casimir energy was calculated for general plate deformations perturbatively. Results on both the normal and the lateral force between sinusoidally corrugated plates were outlined.
Spontaneous Magnetization Generated By Spin, Pulsating, And Planar Combustion Synthesis, Karen S. Martirosyan, J. R. Claycomb, G. Gogoshin, R. A. Yarbrough, J. H. Miller Jr., D. Luss
Spontaneous Magnetization Generated By Spin, Pulsating, And Planar Combustion Synthesis, Karen S. Martirosyan, J. R. Claycomb, G. Gogoshin, R. A. Yarbrough, J. H. Miller Jr., D. Luss
Physics and Astronomy Faculty Publications and Presentations
The motion of the high temperature front during combustion synthesis of ferrite materials generates residual magnetization in cylindrical product samples. The combustion wave created a current density of up to 10 A/cm2, which influenced the magnetization distribution. The measured peak magnetic field intensity was up to 8 mT. Qualitatively different magnetic field maps were generated in ferrite samples synthesized by different combustion modes. The average magnetization vector generated by either planar or pulsating combustion was oriented at a smaller angle with respect to the pellet axis ~f<45°! than those generated by spin combustion ~60°
Mode-Cleaning And Injection Optics Of The Gravitational-Wave Detector Geo600, S. Goßler, M. M. Casey, A. Grant, H. Grote, Volker Quetschke
Mode-Cleaning And Injection Optics Of The Gravitational-Wave Detector Geo600, S. Goßler, M. M. Casey, A. Grant, H. Grote, Volker Quetschke
Physics and Astronomy Faculty Publications and Presentations
The British–German interferometric gravitational-wave detector GEO600 uses two high-finesse triangular ring cavities of 8 m optical pathlength each, as an optical mode-cleaning system. The modecleaner system is housed in an ultrahigh-vacuum environment to avoid contamination of the optics and to minimize both the influence of refractive index variations of the air and acoustic coupling to the optics. To isolate the cavities from seismic noise, all optical components are suspended as double pendulums. These pendulums are damped at their resonance frequencies at the upper pendulum stage with magnet-coil actuators. A suspended reaction mass supports three coils matching magnets bonded onto the …
Comment On ‘‘Why Is The Dna Denaturation Transition First Order?’’, Andreas Hanke, Ralf Metzler
Comment On ‘‘Why Is The Dna Denaturation Transition First Order?’’, Andreas Hanke, Ralf Metzler
Physics and Astronomy Faculty Publications and Presentations
A Comment on the Letter by . The authors of the Letter offer a Reply.