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Reacciones sobre la Reforma Educacional

Reacciones sobre la Reforma Educacional | GRAVITATION | Scoop.it
Representantes de colegios, secundarios y la bancada estudiantil calificaron los proyectos que buscan terminar con el lucro, selección y copago como 'positivos' pero 'insuficientes'.
'No creo que sean los proyectos que van a garantizar la calidad de la educación en Chile', señaló Jesús Triguero, presidente de la Federación de Instituciones de Educación Particular.

Via Instituto Profesional Providencia
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Black holes do not exist, says Stephen Hawking

Black holes do not exist, says Stephen Hawking | GRAVITATION | Scoop.it
Professor Stephen Hawking has claimed black holes do not exist in a landmark new paper.
RUBEN RODRIGUEZ AMADOR's insight:

Sir. Stephen Hawking proclamó la no visibilidad del horizonte de eventos en los ``agujeros negros``, por lo que declaró en semanas pasadas que los agujeros negros no existen (haciendo visible la verdadera complejidad que hay entre la Teoría General de la Relatividad con la  Teoría Cuántica). Es importante ir sabiendo cómo los físicos teóricos de distintas miradas abordan esta noticia y además bajo qué enunciados y oraciones son declaradas las proposiciones frente a las declaradas por el científico Stephen en torno a la no existencia de los hoyos negros. Por otra parte el científico declaró la existencia de horizontes aparentes que están constituidos por materia y luz en forma temporal, por lo que dice que existen los ``agujeros grises``. En mi opinión es evidente que estamos en presencia de un problema grave entre ambas teorías ``cuántica y relativista`` del tipo epistemológico, por lo que creo que muchos de los físicos teóricos no saben el cómo abordarlo, permaneciendo constantemente una presencia cognitiva-interpretativa humana que suele ser perturbadora a  las interpretaciones propias de la Física.  

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Fabric of Reality: The origins of space and time - If space and time are not fundamental, what is?

Fabric of Reality: The origins of space and time - If space and time are not fundamental, what is? | GRAVITATION | Scoop.it
Many researchers believe that physics will not be complete until it can explain not just the behaviour of space and time, but where these entities come from.

 

“Imagine waking up one day and realizing that you actually live inside a computer game,” says Mark Van Raamsdonk, describing what sounds like a pitch for a science-fiction film. But for Van Raamsdonk, a physicist at the University of British Columbia in Vancouver, Canada, this scenario is a way to think about reality. If it is true, he says, “everything around us — the whole three-dimensional physical world — is an illusion born from information encoded elsewhere, on a two-dimensional chip”. That would make our Universe, with its three spatial dimensions, a kind of hologram, projected from a substrate that exists only in lower dimensions.

 

This 'holographic principle' is strange even by the usual standards of theoretical physics. But Van Raamsdonk is one of a small band of researchers who think that the usual ideas are not yet strange enough. If nothing else, they say, neither of the two great pillars of modern physics — general relativity, which describes gravity as a curvature of space and time, and quantum mechanics, which governs the atomic realm — gives any account for the existence of space and time. Neither does string theory, which describes elementary threads of energy. Van Raamsdonk and his colleagues are convinced that physics will not be complete until it can explain how space and time emerge from something more fundamental — a project that will require concepts at least as audacious as holography.

 

But, where is the evidence that there actually is anything more fundamental than space and time? A provocative hint comes from a series of startling discoveries made in the early 1970s, when it became clear that quantum mechanics and gravity were intimately intertwined with thermodynamics, the science of heat. In 1974, most famously, Stephen Hawking of the University of Cambridge, UK, showed that quantum effects in the space around a black hole will cause it to spew out radiation as if it was hot. Other physicists quickly determined that this phenomenon was quite general. Even in completely empty space, they found, an astronaut undergoing acceleration would perceive that he or she was surrounded by a heat bath. The effect would be too small to be perceptible for any acceleration achievable by rockets, but it seemed to be fundamental. If quantum theory and general relativity are correct — and both have been abundantly corroborated by experiment — then the existence of Hawking radiation seemed inescapable.

 

A second key discovery was closely related. In standard thermodynamics, an object can radiate heat only by decreasing its entropy, a measure of the number of quantum states inside it. And so it is with black holes: even before Hawking's 1974 paper, Jacob Bekenstein, now at the Hebrew University of Jerusalem, had shown that black holes possess entropy. But there was a difference. In most objects, the entropy is proportional to the number of atoms the object contains, and thus to its volume. But a black hole's entropy turned out to be proportional to the surface area of its event horizon — the boundary out of which not even light can escape. It was as if that surface somehow encoded information about what was inside, just as a two-dimensional hologram encodes a three-dimensional image.

 

In 1995 then, Ted Jacobson, a physicist at the University of Maryland in College Park, combined these two findings, and postulated that every point in space lies on a tiny 'black-hole horizon' that also obeys the entropy–area relationship. From that, he found, the mathematics yielded Einstein's equations of general relativity — but using only thermodynamic concepts, not the idea of bending space-time. Ted's result suggested that gravity is statistical, a macroscopic approximation to the unseen constituents of space and time.

 

In 2010, this idea was taken a step further by Erik Verlinde, a string theorist at the University of Amsterdam, who showed that the statistical thermodynamics of the space-time constituents — whatever they turned out to be — could automatically generate Newton's law of gravitational attraction. In separate work, Thanu Padmanabhan, a cosmologist at the Inter-University Centre for Astronomy and Astrophysics in Pune, India, showed that Einstein's equations can be rewritten in a form that makes them identical to the laws of thermodynamics — as can many alternative theories of gravity. Padmanabhan is currently extending the thermodynamic approach in an effort to explain the origin and magnitude of dark energy: a mysterious cosmic force that is accelerating the Universe's expansion.


Via Dr. Stefan Gruenwald
RUBEN RODRIGUEZ AMADOR's insight:

¿Qué Teoría del Espacio-Tiempo es convalida por la Física actual?

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Alain Coetmeur's comment, August 31, 2013 5:56 AM
Yes, there is more and more hint that physics is ruled by information theory. 2d TD law is information law. Note that 1st TD law, is implied by 2nd TD law (give me a machine violating TD2, I build a TD1 violating machine). TD2 is heisenberg inequality. Quantum physics is based on the fact that the only reality is what you measure, ie information. Bose-einsteain inequality cliam that if something is same it is counted as one. Relativity claim that information flows below lightspeed, and that any observer is equivalent to another... finally you have informations... where does the lightspeed limit came ? is it an axiom or a consequence of symmetries... funny.
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Standard Candle' Supernova Extraordinarily Magnified by Gravitational Lensing - Space Daily

Standard Candle' Supernova Extraordinarily Magnified by Gravitational Lensing - Space Daily | GRAVITATION | Scoop.it
Standard Candle' Supernova Extraordinarily Magnified by Gravitational Lensing Space Daily SNIa have a very useful property that has enabled cosmologists to chart the expansion of our Universe over the last several billion years: SNIa have...

Via Aso Galicia
RUBEN RODRIGUEZ AMADOR's insight:

GRAVITATIONAL LENSING

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What is the role of epistemological beliefs in physics sciences?

What is the role of epistemological beliefs in physics sciences?

RUBEN RODRIGUEZ AMADOR's insight:

It is important to know how the theoretical and experimental physicists of different views are generated from a scientist developing its statements and sentences that are declared through a set of propositions , which become belief systems.

Contributing to the main question , I will from :

a) The field of scientific research

There are many epistemological problems in the physical sciences , which require absolute seriousness to address them.

Mention two problems of quantum physics , which I have serious complications from the belief systems that have personally or collectively scientific research area .

1 - Positivist Copenhagen Interpretation nowadays many physicists are still working .

- Phenomenalist Thesis : It says that the existence of the physical object is dependent on who observes and describes .

2 - Schrodinger equation ( presents epistemological beliefs systems that do not validate the nature of physical objects )

- The Schrodinger equation is one of the fundamental laws of quantum mechanics equation that says nothing about the beliefs of those who observe the physical facts or instruments or equipment which are made by belief systems of the observers themselves.

It seems very important to help these systems epistemological beliefs that somehow hinder mannered one or more ways of thinking about science, making them as a mechanism to generate this break that prevents researchers get a better view on actual physical facts.

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Stephen Hawking says there is no such thing as black holes, Einstein spinning in his grave | Science & Tech | News | Daily Express

Stephen Hawking says there is no such thing as black holes, Einstein spinning in his grave | Science & Tech | News | Daily Express | GRAVITATION | Scoop.it
STEPHEN Hawking has rocked the world of physics by reversing his lifetime’s work to claim that black holes do NOT exist – insisting they’re more like 50 shades of grey.
RUBEN RODRIGUEZ AMADOR's insight:

what do you think about this ? 

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La Ontologia Materialista de Mario Bunge - Filosofia.mx

La Ontologia Materialista de Mario Bunge - Filosofia.mx | GRAVITATION | Scoop.it

"No estamos obligados a renunciar a los principios ontológicos que están sólidamente arraigados en la ciencia sólo porque algún fragmento ocasional y separable de investigación científica los contradice."

 

"Este tomo lleva por titulo El moblaje del mundo y consta de una introducción y 6 capítulos que se llaman: la sustancia, la forma, la cosa, la posibilidad, el cambio, el espaciotiempo."

 

"Se trata de un intento de construir una ontología materialista, científica y exacta. Para ello recurre en ocasiones a símbolos especiales y determinadas operaciones, esta es la parte mas árida del libro, por lo menos para los que no estamos habituados a tratar con ellos, pero lo que esos símbolos intentan exactificar son en muchas ocasiones “pensamientos comunes” del ideario materialista (de una determinada rama del materialismo) por lo menos esa es la sensación que he tenido en diversos momentos de la lectura. Con algunos de esos pensamientos comunes me he identificado en algún momento y he reflexionado sobre ello, por ejemplo en la frase “Un universo formado por átomos de una única clase podría ser infinitamente complejo”, estas cosas aumentan la satisfacción de la lectura."


Via Alex Huezo
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