Esta es una presentacion que hice con motivo de los requisitos que exige la maestria en fisica en la Unviersidad de Bishops, en Quebec, Canada. Durante mi presentacion, hicieron incapie en un error de subindices durante el desarrollo de las ecuaciones de las ondas gravitacionales. Lamentablemente no recuerdo en que diapositiva me marcaron el error, asi que es un desafio para cualquiera que encuentre mi presentacion interesante para ser utilizada en algun proyecto. Gracias.
Esta es una presentacion que hice con motivo de los requisitos que exige la maestria en fisica en la Unviersidad de Bishops, en Quebec, Canada. Durante mi presentacion, hicieron incapie en un error de subindices durante el desarrollo de las ecuaciones de las ondas gravitacionales. Lamentablemente no recuerdo en que diapositiva me marcaron el error, asi que es un desafio para cualquiera que encuentre mi presentacion interesante para ser utilizada en algun proyecto. Gracias.
Wigner Quasi-probability Distribution of the Cosecant-squared Potential WellJohn Ray Martinez
This is a thesis under Theoretical Physics in journal article format. The paper was accepted for oral presentation and published in SPVM (Samahang Pisika ng Visayas at Mindanao) publication. This was presented during 10th SPVM National Physics Conference and Workshop and won the Best Paper Presentor award.
Obtaining three-dimensional velocity information directly from reflection sei...Arthur Weglein
This paper present a formalism for obtaining the subsurface
velocity configuration directly from reflection seismic data.
Our approach is to apply the results obtained for inverse
problems in quantum scattering theory to the reflection
seismic problem. In particular, we extend the results of
Moses (1956) for inverse quantum scattering and Razavy
(1975) for the one-dimensional (1-D) identification of the
acoustic wave equation to the problem of identifying the
velocity in the three-dimensional (3-D) acoustic wave equation
from boundary value measurements. No a priori knowledge
of the subsurface velocity is assumed and all refraction,
diffraction, and multiple reflection phenomena are
taken into account. In addition, we explain how the idea of
slant stack in processing seismic data is an important part
of the proposed 3-D inverse scattering formalism.
Presents the Earth Gravitation Model used in Navigation.
Please send comments to solo.herme;in@gmail.com.
For more presentation please visit my website at http://www.solohermelin.com.
The Global Positioning System (GPS) is a network of dozens of satellites that hover out in space with the purpose of allowing people to identify their location on earth. Signals from the GPS satellites are transmitted to a GPS receiver on earth’s surface to pinpoint the satellite’s location in space. With knowledge of the satellite’s orbit and utilizing time information, a GPS receiver is able to determine its own location under the condition that four satellites are within range. However, due to the inaccuracy of the receiver’s clock when utilizing commercial GPS units for low cost, the distances calculated, called pseudo-ranges, are not accurate. Ideally, these four pseudo-ranges should intersect at a single point for a true receiver-satellite distance, but the unsynchronized clocks prevent this. To accurately determine a location, a few algebraic computations are necessary to make the adjustment for the imperfect information. These algebraic computations consist of deriving, implementing, and testing two algorithms, the Gradient Descent and Gauss Newton algorithms. Throughout this project, we will be exploring how these algorithms contribute to resolving the clock error when determining the true pseudo- range under noiseless conditions.
A young astronomer’s by now ten years old
results are re-told and put in perspective. The implications are
far-reaching. Angular-momentum shows its clout not only in
quantum mechanics where this is well known, but is also a
major player in the space-time theory of the equivalence
principle and its ramifications. In general relativity, its
fundamental role was largely neglected for the better part of a
century. A children’s device – a friction-free rotating bicycle
wheel suspended from its hub that can be lowered and pulled
up reversibly – serves as an eye-opener. The consequences are
embarrassingly far-reaching in reviving Einstein’s original
dream
First-order cosmological perturbations produced by point-like masses: all sca...Maxim Eingorn
This presentation based on the paper http://arxiv.org/abs/1509.03835 was made at Institute of Cosmology, Tufts University, on November 12, 2015. The abstract follows:
In the framework of the concordance cosmological model the first-order scalar and vector perturbations of the homogeneous background are derived without any supplementary approximations in addition to the weak gravitational field limit. The sources of these perturbations (inhomogeneities) are presented in the discrete form of a system of separate point-like gravitating masses. The obtained expressions for the metric corrections are valid at all (sub-horizon and super-horizon) scales and converge in all points except the locations of the sources, and their average values are zero (thus, first-order backreaction effects are absent). Both the Minkowski background limit and the Newtonian cosmological approximation are reached under certain well-defined conditions. An important feature of the velocity-independent part of the scalar perturbation is revealed: up to an additive constant it represents a sum of Yukawa potentials produced by inhomogeneities with the same finite time-dependent Yukawa interaction range. The suggesting itself connection between this range and the homogeneity scale is briefly discussed along with other possible physical implications.
Wigner Quasi-probability Distribution of the Cosecant-squared Potential WellJohn Ray Martinez
This is a thesis under Theoretical Physics in journal article format. The paper was accepted for oral presentation and published in SPVM (Samahang Pisika ng Visayas at Mindanao) publication. This was presented during 10th SPVM National Physics Conference and Workshop and won the Best Paper Presentor award.
Obtaining three-dimensional velocity information directly from reflection sei...Arthur Weglein
This paper present a formalism for obtaining the subsurface
velocity configuration directly from reflection seismic data.
Our approach is to apply the results obtained for inverse
problems in quantum scattering theory to the reflection
seismic problem. In particular, we extend the results of
Moses (1956) for inverse quantum scattering and Razavy
(1975) for the one-dimensional (1-D) identification of the
acoustic wave equation to the problem of identifying the
velocity in the three-dimensional (3-D) acoustic wave equation
from boundary value measurements. No a priori knowledge
of the subsurface velocity is assumed and all refraction,
diffraction, and multiple reflection phenomena are
taken into account. In addition, we explain how the idea of
slant stack in processing seismic data is an important part
of the proposed 3-D inverse scattering formalism.
Presents the Earth Gravitation Model used in Navigation.
Please send comments to solo.herme;in@gmail.com.
For more presentation please visit my website at http://www.solohermelin.com.
The Global Positioning System (GPS) is a network of dozens of satellites that hover out in space with the purpose of allowing people to identify their location on earth. Signals from the GPS satellites are transmitted to a GPS receiver on earth’s surface to pinpoint the satellite’s location in space. With knowledge of the satellite’s orbit and utilizing time information, a GPS receiver is able to determine its own location under the condition that four satellites are within range. However, due to the inaccuracy of the receiver’s clock when utilizing commercial GPS units for low cost, the distances calculated, called pseudo-ranges, are not accurate. Ideally, these four pseudo-ranges should intersect at a single point for a true receiver-satellite distance, but the unsynchronized clocks prevent this. To accurately determine a location, a few algebraic computations are necessary to make the adjustment for the imperfect information. These algebraic computations consist of deriving, implementing, and testing two algorithms, the Gradient Descent and Gauss Newton algorithms. Throughout this project, we will be exploring how these algorithms contribute to resolving the clock error when determining the true pseudo- range under noiseless conditions.
A young astronomer’s by now ten years old
results are re-told and put in perspective. The implications are
far-reaching. Angular-momentum shows its clout not only in
quantum mechanics where this is well known, but is also a
major player in the space-time theory of the equivalence
principle and its ramifications. In general relativity, its
fundamental role was largely neglected for the better part of a
century. A children’s device – a friction-free rotating bicycle
wheel suspended from its hub that can be lowered and pulled
up reversibly – serves as an eye-opener. The consequences are
embarrassingly far-reaching in reviving Einstein’s original
dream
First-order cosmological perturbations produced by point-like masses: all sca...Maxim Eingorn
This presentation based on the paper http://arxiv.org/abs/1509.03835 was made at Institute of Cosmology, Tufts University, on November 12, 2015. The abstract follows:
In the framework of the concordance cosmological model the first-order scalar and vector perturbations of the homogeneous background are derived without any supplementary approximations in addition to the weak gravitational field limit. The sources of these perturbations (inhomogeneities) are presented in the discrete form of a system of separate point-like gravitating masses. The obtained expressions for the metric corrections are valid at all (sub-horizon and super-horizon) scales and converge in all points except the locations of the sources, and their average values are zero (thus, first-order backreaction effects are absent). Both the Minkowski background limit and the Newtonian cosmological approximation are reached under certain well-defined conditions. An important feature of the velocity-independent part of the scalar perturbation is revealed: up to an additive constant it represents a sum of Yukawa potentials produced by inhomogeneities with the same finite time-dependent Yukawa interaction range. The suggesting itself connection between this range and the homogeneity scale is briefly discussed along with other possible physical implications.
Gravitational field and potential, escape velocity, universal gravitational l...lovizabasharat
What is Escape Velocity-its derivation-examples-applications
Universal Gravitational Law-Derivation and Examples
Gravitational Field And Gravitational Potential-Derivation, Realation and numericals
Radial Velocity and acceleration-derivation and examples
Transverse Velocity and acceleration and examples
El 7 de noviembre de 2016, la Fundación Ramón Areces organizó el Simposio Internacional 'Solitón: un concepto con extraordinaria diversidad de aplicaciones inter, trans, y multidisciplinares. Desde el mundo macroscópico al nanoscópico'.
Stochastic Gravity in Conformally-flat SpacetimesRene Kotze
The National Institute for Theoretical Physics, and the Mandelstam Institute for Theoretical Physics, School of Physics, would like to invite to its coming talk in the theoretical physics seminar series, entitled:
"Stochastic Gravity in Conformally-flat Spacetimes"
to be presented by Prof. Hing-Tong Cho (Tamkang University, Taiwan)
Abstract: The theory of stochastic gravity takes into account the effects of quantum field fluctuations onto the classical spacetime. The essential physics can be understood from the analogous Brownian motion model. We shall next concentrate on the case with conformally-flat spacetimes. Our main concern is to derive the so-called noise kernels. We shall also describe our on-going program to investigate the Einstein-Langevin equation in these spacetimes.
Dates: Tuesday, 17th February 2015
Venue: The Frank Nabarro lecture theatre, P216
Time: 13.20 - 14.10 - TODAY
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
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.
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.
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.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Lateral Ventricles.pdf very easy good diagrams comprehensive
Kgeppt spvm 0_try1
1. Ferdinand Joseph P. Roaa, Alwielland Q. Bello b,
Engr. Leo Cipriano L. Urbiztondo Jr.c
2. In this elementary exercise we consider the
Klein-Gordon field in the background of
Schwarzschild space-time metric. Very near the
event horizon the radial equation of motion is
approximated in form and we obtain oscillatory
solution in the Regge-Wheeler coordinate. The
time and radial solutions are then recast in the
outgoing and ingoing coordinates that
consequently lead to the outgoing and ingoing
waves that have respectively dissimilar
(distinct) analytic properties in the future and
past event horizons.
7. - out-going, in-going null paths,
Carter-Penrose (CP) diagram
- Future and past event horizons
8. [1]Townsend, P. K., Blackholes – Lecture
Notes, http://xxx.lanl.gov/abs/gr-
qc/9707012
[2]Carroll, S. M., Lecture Notes On
General Relativity, arXiv:gr-qc/9712019
[3]S. W. Hawking, Particle Creation by
Black Holes, Commun. math. Phys. 43,
199—220 (1975)
9. [4]Ohanian, H. C. Gravitation and
Spacetime, New York:W. W. Norton &
Company Inc. Copyright 1976
[5]Bedient, P. E., Rainville, E. D.,
Elementary Differential Equations,
seventh edition, Macmillan Publishing
Company, 1989, New York, New York,
USA
10. - based on our answers to an exercise
presented on page 142 of [1]
- topic related to Hawking radiation
- this paper only covers the important
details in our solutions to Klein-
Gordon field equation against the
background of Schwarzschild space-
time metric
11. -Hawking radiation was explored in the middle
of 1970’s in Stephen Hawking’s paper [3]
-- quantum mechanics of pair production in
extreme proximity to a very strong
gravitational field of a blackhole : result led
to Planck distribution for black body
radiation at a given Hawking temperature –
BHs radiate
25. contrasting case, limit as 𝑟 → ∞ very
far from the event horizons
𝑑2 𝑅
𝑑𝑟∗2 + (𝜔2
−𝑀2
)𝑅 = 0
(9.8.1)
massless 𝑀 = 0
𝑑2 𝑅
𝑑𝑟∗2 + 𝜔2
𝑅 = 0 (9.8.2)
26. Note:
- case for waves very near event
horizons mass term in (9.2) drops off,
vanishing 𝜂 – effectively massless
scalar that corresponds to a massless
scalar field very far from horizons
27. - very near the event horizon the scalar
field is effectively massless, very far
from the horizon, there corresponds
the same radial equation of motion for
a massless scalar field
28. - the crude approximation:
-- same out-going solution (9.7.1) for
the two cases of waves very near the
horizon and waves very far from the
horizon
-- assume that the same out-going
waves very near the horizon that
reached very far from the horizon
33. given changes of coordinates
𝜒 + 𝜂 = 2 𝑢′, tan 𝑢′ = 𝑢 (10.2.1)
𝜒 − 𝜂 = −2 𝑣 ′ , tan 𝑣 ′ = 𝑣 (10.2.2)
34. very near the horizon, 𝑟 ≈ 𝑟 𝐻
𝑟∗
→ −∞
Future event horizon,
𝐻+
: 𝑟∗
→ −∞ and 𝑡 → ∞
35. - along 𝑢 = 𝑐𝑜𝑛𝑠𝑡, infalling wave hits 𝐻+
in an infinite coordinate future
𝑟∗
→ −∞, 𝑡 → ∞, 𝑣 = ∞
outgoing wave not defined on the
future event horizon
36. past event horizon,
𝐻−
: 𝑟∗
→ −∞, 𝑡 → − ∞
- along 𝑣 = 𝑐𝑜𝑛𝑠𝑡, the out-going wave
hits 𝐻−
in an infinite coordinate
past
37. 𝑟∗
→ −∞, 𝑡 → − ∞, 𝑢 = −∞
infalling wave not defined on past
event horizon
38. Future continuing discussions:
-parametrized forms of the wave
solutions Φ(𝑟∗ 𝑡)
+
= 𝐴0
+
𝑒𝑥𝑝 −𝑖𝜔 𝑣 𝑢
𝑣 𝑢 = −2𝐺𝑀𝑙𝑛 − 𝑢 , −∞ < 𝑢 < 0
- Fourier components, scalar field
operators, Bogoliubov coefficients
- Planck distribution for black body
radiation, Hawking temperature