Geometrical aspects of hypermagnetic field interactions

2022 ◽  
Author(s):  
Diego Julio Cirilo-Lombardo
Keyword(s):  
Polarization Plane ◽  
Generalized Born ◽  
Torsion Field ◽  
Cmb Polarization

Abstract We investigate the role of a dynamical torsion field coming from a geometrical non Riemannian model. This model is reminiscent of a generalized Born-Infeld theory and the torsion plays a fundamental role trough its Hodge dual: the pseudovector h_{μ}. This h_{μ} contains axion, Kalb-Ramond 2-form and physical observables of macroscopic character. An emergent interaction Lagrangian arises from the model and it is compared with a superstring inspired one from [8] pulling out several important consequences in favor of our proposal, as the possibility of establishing a clear connection between the change of CMB polarization plane and the anomalous current n_{chiral}.

scholarly journals COUPLING OF QUINTESSENCE TO PSEUDOSCALAR OF ELECTROMAGNETISM AND CMB POLARIZATION

2007 ◽  
Vol 22 (25n28) ◽  
pp. 1953-1958
Author(s):  
GUO CHIN LIU
Keyword(s):  
Cosmic Microwave Background ◽  
Power Spectra ◽  
Polarization Plane ◽  
Microwave Background ◽  
Cmb Polarization ◽  
Quintessence Model

Coupling between quintessence and pseudoscalar of electromagnetism induces the rotation of the polarization plane of Cosmic Microwave Background(CMB). This rotation mixes the power between E and B modes and generates parity-violating TB and EB modes. Given the potential of a quintessence model, we present the full set of CMB power spectra for temperature and polarization anisotropies. These power spectra can be used to constrain the coupling and quintessence model.

scholarly journals The Role of Displacing Confined Solvent in the Conformational Equilibrium of β-Cyclodextrin

2019 ◽  
Author(s):  
Peng He ◽  
Sheila Sarkar ◽  
Emilio Gallicchio ◽  
Tom Kurtzman ◽  
Lauren Wickstrom
Keyword(s):  
Conformational Equilibrium ◽  
Implicit Solvent ◽  
Theory Analysis ◽  
State Behavior ◽  
Generalized Born ◽  
Solvent Models ◽  
Explicit Solvent ◽  
Dynamics Simulations ◽  
Opening And Closing

<p>This study investigates the role of hydration and its relationship to the conformational equilibrium of the host molecule β-cyclodextrin. Molecular dynamics simulations indicate that the unbound β-cyclodextrin exhibits two state behavior in explicit solvent due to the opening and closing of its cavity. In implicit solvent, these transitions are not observed and there is one dominant conformation of β-cyclodextrin with an open cavity. Based on these observations, we investigate the hypothesis that the expulsion of thermodynamically unfavorable water molecules into the bulk plays an important role in controlling the accessibility of the closed macrostate at room temperature. We compare the results of the molecular mechanics analytical generalized Born plus non-polar solvation approach to those obtained through Grid Inhomogeneous Solvation Theory analysis with explicit solvation to elucidate the thermodynamic forces at play. The calculations help to illustrate the deficiencies of continuum solvent models and demonstrate the key role of the thermodynamics of enclosed hydration in driving the conformational equilibrium of molecules in solution. </p>

scholarly journals Octopus Consciousness: The Role of Perceptual Richness

NeuroSci ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 276-290
Author(s):  
Jennifer Mather
Keyword(s):  
Polarization Plane ◽  
Light Polarization ◽  
Open Loop ◽  
Head Movements ◽  
Light Polarization Plane ◽  
The Rich ◽  
Landmark Location ◽  
The Brain ◽  
Laboratory Situation

It is always difficult to even advance possible dimensions of consciousness, but Birch et al., 2020 have suggested four possible dimensions and this review discusses the first, perceptual richness, with relation to octopuses. They advance acuity, bandwidth, and categorization power as possible components. It is first necessary to realize that sensory richness does not automatically lead to perceptual richness and this capacity may not be accessed by consciousness. Octopuses do not discriminate light wavelength frequency (color) but rather its plane of polarization, a dimension that we do not understand. Their eyes are laterally placed on the head, leading to monocular vision and head movements that give a sequential rather than simultaneous view of items, possibly consciously planned. Details of control of the rich sensorimotor system of the arms, with 3/5 of the neurons of the nervous system, may normally not be accessed to the brain and thus to consciousness. The chromatophore-based skin appearance system is likely open loop, and not available to the octopus’ vision. Conversely, in a laboratory situation that is not ecologically valid for the octopus, learning about shapes and extents of visual figures was extensive and flexible, likely consciously planned. Similarly, octopuses’ local place in and navigation around space can be guided by light polarization plane and visual landmark location and is learned and monitored. The complex array of chemical cues delivered by water and on surfaces does not fit neatly into the components above and has barely been tested but might easily be described as perceptually rich. The octopus’ curiosity and drive to investigate and gain more information may mean that, apart from richness of any stimulus situation, they are consciously driven to seek out more information. This review suggests that cephalopods may not have a similar type of intelligence as the ‘higher’ vertebrates, they may not have similar dimensions or contents of consciousness, but that such a capacity is present nevertheless.

scholarly journals POLOCALC: A Novel Method to Measure the Absolute Polarization Orientation of the Cosmic Microwave Background

2017 ◽  
Vol 06 (02) ◽  
pp. 1740008 ◽  
Author(s):  
Federico Nati ◽  
Mark J. Devlin ◽  
Martina Gerbino ◽  
Bradley R. Johnson ◽  
Brian Keating ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Polarization Plane ◽  
Gravity Models ◽  
Polarization Angle ◽  
Microwave Background ◽  
Polarized Beam ◽  
Cmb Polarization ◽  
Novel Method ◽  
Polarization Orientation ◽  
The Absolute

We describe a novel method to measure the absolute orientation of the polarization plane of the Cosmic Microwave Background (CMB) photons with arcsecond accuracy, enabling unprecedented measurements for cosmology and fundamental physics. Existing and planned CMB polarization instruments looking for primordial B-mode signals need an independent, experimental method for systematics control on the absolute polarization orientation. The lack of such a method limits the accuracy of the detection of inflationary gravitational waves, the constraining power on the neutrino sector through measurements of gravitational lensing of the CMB, the possibility of detecting Cosmic Birefringence (CB), and the ability to measure primordial magnetic fields. Sky signals used for calibration and direct measurements of the detector orientation cannot provide an accuracy better than 1[Formula: see text]. Self-calibration methods provide better accuracy, but may be affected by foreground signals and rely heavily on model assumptions, losing constraining power on fundamental processes, like CB, Faraday Rotation and chiral gravity models. The POLarization Orientation CALibrator for Cosmology, POLOCALC, will dramatically improve instrumental accuracy by means of an artificial calibration source flying on high-altitude balloons and aerial drones. Polarization angle calibration requires observation of a well-characterized distant source at high elevation angles. A balloon-borne calibrator will provide a source in the far field of larger telescopes, while an aerial drone can be used for tests and smaller polarimeters. POLOCALC will also allow a unique method to measure the telescopes’ polarized beam. Even a two-hour balloon flight will allow enough time to perform polarization angle calibration and polarized beam function measurements. The source will make use of both narrow and broadband microwave emitters between 40[Formula: see text]GHz and 150[Formula: see text]GHz coupled to precise polarizing filters. The orientation of the source polarization plane will be registered to absolute celestial coordinates by star cameras and gyroscopes with arcsecond accuracy. This project can become a rung in the calibration ladder for the field: any existing or future CMB polarization experiment observing our novel polarization calibrator will enable measurements of the polarization angle for each detector with respect to absolute sky coordinates.

scholarly journals The Role of Displacing Confined Solvent in the Conformational Equilibrium of β-Cyclodextrin

2019 ◽  
Author(s):  
Peng He ◽  
Sheila Sarkar ◽  
Emilio Gallicchio ◽  
Tom Kurtzman ◽  
Lauren Wickstrom
Keyword(s):  
Conformational Equilibrium ◽  
Implicit Solvent ◽  
Theory Analysis ◽  
State Behavior ◽  
Generalized Born ◽  
Solvent Models ◽  
Explicit Solvent ◽  
Dynamics Simulations ◽  
Opening And Closing

<p>This study investigates the role of hydration and its relationship to the conformational equilibrium of the host molecule β-cyclodextrin. Molecular dynamics simulations indicate that the unbound β-cyclodextrin exhibits two state behavior in explicit solvent due to the opening and closing of its cavity. In implicit solvent, these transitions are not observed and there is one dominant conformation of β-cyclodextrin with an open cavity. Based on these observations, we investigate the hypothesis that the expulsion of thermodynamically unfavorable water molecules into the bulk plays an important role in controlling the accessibility of the closed macrostate at room temperature. We compare the results of the molecular mechanics analytical generalized Born plus non-polar solvation approach to those obtained through Grid Inhomogeneous Solvation Theory analysis with explicit solvation to elucidate the thermodynamic forces at play. The calculations help to illustrate the deficiencies of continuum solvent models and demonstrate the key role of the thermodynamics of enclosed hydration in driving the conformational equilibrium of molecules in solution. </p>

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management
Sign in / Sign up

Export Citation Format

Share Document