David Kirkpatrick

October 2, 2008

Is Earth part of a strange bubble of space-time?

Filed under: Science — Tags: , , , , , , — David Kirkpatrick @ 9:53 am

From KurzweilAI.net — This Live Science article opines we exist in an abnormal bubble of space-time that explains away dark energy.

Do We Live in a Giant Cosmic Bubble?
Live Science, Sep. 30, 2008

Earth may be trapped in an abnormal bubble of space-time that is particularly void of matter, which could account for the apparent acceleration of the universe‘s expansion, not dark energy.

Matter warps space-time. Light travelling from supernovae outside our bubble would appear dimmer, because the light would diverge more than we would expect once it got inside our void.

Oxford researchers Pedro G. Ferreira and Kate Land say that the upcoming Joint Dark Energy Mission, planned by NASA and the U.S. Department of Energy to launch in 2014 or 2015, may be able to distinguish between dark energy and the void. The satellite aims to measure the expansion of the universe precisely by observing about 2,300 supernovae.

They suggest that by looking at a large number of supernovae in a certain region of the universe, they should be able to tell whether the objects are really accelerating away, or if their light is merely being distorted in a void.

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May 15, 2008

Nanowire solar cells and black holes

From KurzweilAI.net, nanotech that may boost solar efficiency and black holes may have an escape hatch of sorts

Nanowires may boost solar cell efficiency, engineers say
PhysOrg.com, May 14, 2008

University of California, San Diego electrical engineers have created experimental solar cells spiked with nanowires that could lead to highly efficient thin-film solar cells of the future.

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Physicists Demonstrate How Information Can Escape From Black Holes
PhysOrg.com, May 14, 2008

Physicists at Penn State and the Raman Research Institute in India have discovered such a mechanism by which information can be recovered from black holes.

They suggest that singularities do not exist in the real world. “Information only appears to be lost because we have been looking at a restricted part of the true quantum-mechanical space-time,” said Madhavan Varadarajan, a professor at the Raman Research Institute. “Once you consider quantum gravity, then space-time becomes much larger and there is room for information to reappear in the distant future on the other side of what was first thought to be the end of space-time.”

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