Comments on: Lensing in the Laboratory http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/ Random samplings from a universe of ideas. Mon, 09 Nov 2009 14:00:54 -0600 http://wordpress.org/?v=2.8.4 hourly 1 By: La Tierra a través de una lente gravitatoria « La Singularidad Desnuda http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/comment-page-1/#comment-26584 La Tierra a través de una lente gravitatoria « La Singularidad Desnuda Tue, 03 Apr 2007 15:28:07 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/#comment-26584 [...] En un reciente apunte en Cosmic Variance, Mark Trodden toca también el tema de las lentes gravitatorias, y proporciona un enlace interesante a la página de Pete Kernan, de la Case Western Reserve University. En dicha página se incluye un applet en java que permite experimentar con el efecto de una lente gravitatoria. Concretamente se puede indicar la URL de una imagen de nuestra elección, y observar la distorsión que produce en la misma la presencia de un cuerpo masivo situado entre nosotros y la imagen. Es bastante instructivo ver el efecto, así que he tomado una fotografía de la Tierra desde el espacio y he generado varias imágenes correspondientes a la distorsión que produciría un cuerpo de diferente masa. En la secuencia de imágenes que sigue, la primera corresponde a la ausencia de distorsión, y a partir de la segunda imagen vamos cuatriplicando la masa de la lente gravitatoria (que podemos imaginar a mitad de distancia entre nosotros y la Tierra, aproximadamente en la línea visual de Guinea Ecuatorial). [...] [...] En un reciente apunte en Cosmic Variance, Mark Trodden toca también el tema de las lentes gravitatorias, y proporciona un enlace interesante a la página de Pete Kernan, de la Case Western Reserve University. En dicha página se incluye un applet en java que permite experimentar con el efecto de una lente gravitatoria. Concretamente se puede indicar la URL de una imagen de nuestra elección, y observar la distorsión que produce en la misma la presencia de un cuerpo masivo situado entre nosotros y la imagen. Es bastante instructivo ver el efecto, así que he tomado una fotografía de la Tierra desde el espacio y he generado varias imágenes correspondientes a la distorsión que produciría un cuerpo de diferente masa. En la secuencia de imágenes que sigue, la primera corresponde a la ausencia de distorsión, y a partir de la segunda imagen vamos cuatriplicando la masa de la lente gravitatoria (que podemos imaginar a mitad de distancia entre nosotros y la Tierra, aproximadamente en la línea visual de Guinea Ecuatorial). [...]

]]> By: Count Iblis http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/comment-page-1/#comment-26583 Count Iblis Mon, 02 Apr 2007 21:27:50 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/#comment-26583 Also, <a href="http://www.cbsnews.com/stories/2003/10/14/health/main577938.shtml" rel="nofollow">inflation theory describes the progress of the obesity epidemic pretty well</a> <blockquote>Americans are not just getting fatter, they are ballooning to extremely obese proportions at an alarming rate.</blockquote> :) Also, inflation theory describes the progress of the obesity epidemic pretty well

Americans are not just getting fatter, they are ballooning to extremely obese proportions at an alarming rate.

:)

]]> By: Lab Lemming http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/comment-page-1/#comment-26576 Lab Lemming Mon, 02 Apr 2007 12:12:34 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/#comment-26576 Manual trackback: <a href="http://lablemminglounge.blogspot.com/2007/04/relativistic-obesity.html" rel="nofollow">Relativistic Obesity</a> "The obesity epidemic in America has reached relativistic proportions, with some overweight citizens gaining so much weight that they distort the space and time around them. As the photo below demonstrates..." Manual trackback:
Relativistic Obesity
“The obesity epidemic in America has reached relativistic proportions, with some overweight citizens gaining so much weight that they distort the space and time around them. As the photo below demonstrates…”

]]> By: Plato http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/comment-page-1/#comment-26580 Plato Mon, 02 Apr 2007 05:40:06 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/#comment-26580 Ned's work has indeed provided good information for those of us learning. <a href="http://www.lsst.org/Science/images/lens0.jpg" rel="nofollow">Lensing</a> The table top method would be like just drawing circles? See <a href="http://www.lsst.org/Science/darkmatter.shtml" rel="nofollow">here</a> for image and info. Ned’s work has indeed provided good information for those of us learning.

Lensing

The table top method would be like just drawing circles? See here for image and info.

]]> By: Mark http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/comment-page-1/#comment-26579 Mark Mon, 02 Apr 2007 04:04:36 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/#comment-26579 Thanks Ned (nice to hear from you!). These are great links. If readers don't know Ned's web site, you really should take a look at http://www.astro.ucla.edu/~wright/cosmolog.htm for one of the best educational cosmology sites you'll ever find. Thanks Ned (nice to hear from you!). These are great links. If readers don’t know Ned’s web site, you really should take a look at

http://www.astro.ucla.edu/~wright/cosmolog.htm

for one of the best educational cosmology sites you’ll ever find.

]]> By: Ned Wright http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/comment-page-1/#comment-26581 Ned Wright Sun, 01 Apr 2007 22:05:29 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/#comment-26581 I have some nice lensing related material with animations at http://www.astro.ucla.edu/~wright/cluster-lensing.html and http://www.astro.ucla.edu/~wright/deflection-delay.html and http://www.astro.ucla.edu/~wright/microlensing.html I have some nice lensing related material with animations at
http://www.astro.ucla.edu/~wright/cluster-lensing.html
and
http://www.astro.ucla.edu/~wright/deflection-delay.html
and
http://www.astro.ucla.edu/~wright/microlensing.html

]]> By: pligg.com http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/comment-page-1/#comment-26582 pligg.com Sun, 01 Apr 2007 06:49:10 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/#comment-26582 <strong>Lensing in the Laboratory</strong> Gravitational lensing - the phenomenon in which diverging light rays from a source are refocused due to the warping of space by a massive object - has in recent years evolved from a beautiful test of General Relativity to a precision tool with which to... Lensing in the Laboratory

Gravitational lensing – the phenomenon in which diverging light rays from a source are refocused due to the warping of space by a massive object – has in recent years evolved from a beautiful test of General Relativity to a precision tool with which to…

]]> By: Count Iblis http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/comment-page-1/#comment-26578 Count Iblis Sun, 01 Apr 2007 00:02:09 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/#comment-26578 This is fascinating stuff. And much more is possible in principle. There is an old article (ApJ I think) in which it is shown that one can use the two radio images to do interferometry. The effective baseline would be huge and that would enable one to resolve tiny details of the quasar. This is fascinating stuff. And much more is possible in principle. There is an old article (ApJ I think) in which it is shown that one can use the two radio images to do interferometry. The effective baseline would be huge and that would enable one to resolve tiny details of the quasar.

]]> By: mollishka http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/comment-page-1/#comment-26577 mollishka Sat, 31 Mar 2007 22:13:34 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/03/31/lensing-in-the-laboratory/#comment-26577 Apparently you can get a similar lens (for much less money and effort!) by chopping/breaking a wine glass at the stem; the bottom glass distorts background sources much like an isothermal sphere gravitational lens distorts background sources. Apparently you can get a similar lens (for much less money and effort!) by chopping/breaking a wine glass at the stem; the bottom glass distorts background sources much like an isothermal sphere gravitational lens distorts background sources.

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