1. The document summarizes a new symmetric solution to the dynamical Casimir effect involving a moving mirror that produces massless scalar particles.
2. The model involves a 1+1 dimensional scalar field that is minimally coupled to a moving mirror with specific acceleration and asymptotic behavior properties.
3. The solution provides the simplest example of Casimir light production and indicates the mirror will reach an eternal redshift and temperature, representing a remnant state.
As recent and future galaxy surveys map the large-scale structure of the universe with unprecedented pace and precision, it is worthwhile to consider innovative data analysis methods beyond traditional Gaussian 2-point statistics to extract more cosmological information from those datasets. Such efforts are often plagued by substantially increased complexity of the analysis. Hoping to improve this, I will present simple, nearly optimal methods to measure 3-point statistics as easily as 2-point statistics, by cross-correlating the mass density with specific quadratic fields [arXiv:1411.6595]. Inspired by these results, I will argue that BAO reconstructions already combine 2-point statistics with certain 3- and 4-point functions automatically [arXiv:1508.06972]. I will present several new Eulerian and Lagrangian reconstruction algorithms and discuss their performance in simulations.
Bayesian X-ray Spectral Analysis of the Symbiotic Star RT CruAshkbiz Danehkar
Talk presented at Chandra Data Science: Novel Methods in Computing and Statistics for X-ray Astronomy, Virtual Meeting, Chandra X-ray Center, USA, August 18, 2021
Hard X-ray Emitting Symbiotics: Candidates for Type Ia Supernova ProgenitorsAshkbiz Danehkar
Talk presented at American Physical Society (APS) April Meeting, Session Z09: Stars, White Dwarfs, & Thermonuclear Supernovae, Abstract id.Z09.006, Virtual Meeting, USA, April 20, 2021, https://doi.org/10.6084/m9.figshare.14669499
Ultra-fast Outflows from Active Galactic Nuclei of Seyfert I GalaxiesAshkbiz Danehkar
High Energy Phenomena Seminar, Harvard CfA, Cambridge, USA, September 7, 2016, https://doi.org/10.6084/m9.figshare.13699048 https://youtu.be/7q_wv61ou1E
Active Galactic Nuclei: Laboratory for Gravitational PhysicsAshkbiz Danehkar
Talk at the 29th Midwest Relativity Meeting, Grand Valley State University, Grand Rapids, MI, USA, October 4, 2019, https://doi.org/10.6084/m9.figshare.13699240
As recent and future galaxy surveys map the large-scale structure of the universe with unprecedented pace and precision, it is worthwhile to consider innovative data analysis methods beyond traditional Gaussian 2-point statistics to extract more cosmological information from those datasets. Such efforts are often plagued by substantially increased complexity of the analysis. Hoping to improve this, I will present simple, nearly optimal methods to measure 3-point statistics as easily as 2-point statistics, by cross-correlating the mass density with specific quadratic fields [arXiv:1411.6595]. Inspired by these results, I will argue that BAO reconstructions already combine 2-point statistics with certain 3- and 4-point functions automatically [arXiv:1508.06972]. I will present several new Eulerian and Lagrangian reconstruction algorithms and discuss their performance in simulations.
Bayesian X-ray Spectral Analysis of the Symbiotic Star RT CruAshkbiz Danehkar
Talk presented at Chandra Data Science: Novel Methods in Computing and Statistics for X-ray Astronomy, Virtual Meeting, Chandra X-ray Center, USA, August 18, 2021
Hard X-ray Emitting Symbiotics: Candidates for Type Ia Supernova ProgenitorsAshkbiz Danehkar
Talk presented at American Physical Society (APS) April Meeting, Session Z09: Stars, White Dwarfs, & Thermonuclear Supernovae, Abstract id.Z09.006, Virtual Meeting, USA, April 20, 2021, https://doi.org/10.6084/m9.figshare.14669499
Ultra-fast Outflows from Active Galactic Nuclei of Seyfert I GalaxiesAshkbiz Danehkar
High Energy Phenomena Seminar, Harvard CfA, Cambridge, USA, September 7, 2016, https://doi.org/10.6084/m9.figshare.13699048 https://youtu.be/7q_wv61ou1E
Active Galactic Nuclei: Laboratory for Gravitational PhysicsAshkbiz Danehkar
Talk at the 29th Midwest Relativity Meeting, Grand Valley State University, Grand Rapids, MI, USA, October 4, 2019, https://doi.org/10.6084/m9.figshare.13699240
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
Multi-source connectivity as the driver of solar wind variability in the heli...Sérgio Sacani
The ambient solar wind that flls the heliosphere originates from multiple
sources in the solar corona and is highly structured. It is often described
as high-speed, relatively homogeneous, plasma streams from coronal
holes and slow-speed, highly variable, streams whose source regions are
under debate. A key goal of ESA/NASA’s Solar Orbiter mission is to identify
solar wind sources and understand what drives the complexity seen in the
heliosphere. By combining magnetic feld modelling and spectroscopic
techniques with high-resolution observations and measurements, we show
that the solar wind variability detected in situ by Solar Orbiter in March
2022 is driven by spatio-temporal changes in the magnetic connectivity to
multiple sources in the solar atmosphere. The magnetic feld footpoints
connected to the spacecraft moved from the boundaries of a coronal hole
to one active region (12961) and then across to another region (12957). This
is refected in the in situ measurements, which show the transition from fast
to highly Alfvénic then to slow solar wind that is disrupted by the arrival of
a coronal mass ejection. Our results describe solar wind variability at 0.5 au
but are applicable to near-Earth observatories.
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
1. Slicing the Vacuum
A new simple symmetric solution to the
dynamical Casimir effect
Michael R.R. Good
Nazarbayev University
ECL17: Exploring the Energetic Universe 2017
Nazarbayev University, Astana, August 2017
Grants: US DOE: DE-SC-0007867, D-AC02-05CH11231
JSF 15-07-0000, ORAU and Social Policy
Talk based on: [Michael Good and Eric Linder] 1605.0663 [gr-cq]
4. Reflections on Black Mirrors
Hawking, S. W.
“Particle Creation by Black Holes”, CMP, 1975
5. The Model
• Massless Particles
• Scalar Field
• 1+1 Dimensions
• Non-interacting
• Minimally Coupled
• Klein-Gordon Equ.
•
Davies, P. C. W and S. A. Fulling
“Radiation from Moving Mirrors and Black Holes”, PRS, 1976, 77
36. Conclusions
• A finite symmetric analytic model exists.
• The simplest example of Casimir light.
• An eternal red-shift indicates a remnant.
• A fast speed indicates a temperature.
At late times, it is well known that the moving mirror and black hole give off thermal emission. In the curved spacetime result, the kappa is the surface gravity, while in the flat spacetime + boundary condition result, the kappa is an acceleration parameter.
Effects of acceleration will yield insights into the effects of gravitation.
It is my hope that further study of these simple, exactly solvable, moving mirror models will enhance our understanding of the particle and energy creation due to amplification of field fluctuations by strongly time dependent accelerations, or in the case of black hole evaporation, strong time dependent gravitational fields.
Moving mirrors provide a simple laboratory to construct the mathematical machinery needed to understand the time evolution of black hole evaporation.
And I’m optimistic that results like this will shed light on he dynamical Casimir effect, and black hole evaporation.
But again, these eternal thermal moving mirror solutions don’t offer any non-equilibrium thermodynamics.
Let’s take a look at what non-thermal moving mirror solutions can look like.
The maximum of the distribution! Gives the product log.
Entering Segway: These non-eternally thermal solutions have interesting early time behaviour. Both in terms of energy flux and particle creation.
Exiting Segway: Let’s look at the exact correspondence and briefly investigate the meaning of the mirror trajectory in the black hole case.
Entering Segway: These non-eternally thermal solutions have interesting early time behaviour. Both in terms of energy flux and particle creation.
Exiting Segway: Let’s look at the exact correspondence and briefly investigate the meaning of the mirror trajectory in the black hole case.
![Slicing the Vacuum
A new simple symmetric solution to the
dynamical Casimir effect
Michael R.R. Good
Nazarbayev University
ECL17: Exploring the Energetic Universe 2017
Nazarbayev University, Astana, August 2017
Grants: US DOE: DE-SC-0007867, D-AC02-05CH11231
JSF 15-07-0000, ORAU and Social Policy
Talk based on: [Michael Good and Eric Linder] 1605.0663 [gr-cq]](https://image.slidesharecdn.com/eclaugust20172-170817060639/85/Ecl-august-2017-2-1-320.jpg)
