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Were early-generation Type Ia supenovae intrinsically brighter thantoday's?
Star burst | COSMOS magazine
"Simulations developed by supernova expert Stan Woosley, also of UC Santa Cruz, along with Kasen, Fritz Röpke of the Max Planck Institute for Astrophysics in Garching, Germany, and others now suggest that supernovae that erupted a few billion years back in time may be different - intrinsically brighter - than those exploding today. The team has begun to identify several other features that may affect the brightness - such as how rapidly a star rotated before it exploded and its abundance of elements heavier than helium - which might confound dark energy measurements if overlooked." http://www.cosmosmagazine.com/featur...rst?page=0%2C1 |
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Were early-generation Type Ia supenovae intrinsically brighterthan today's?
On 12/23/09 5:05 AM, Yousuf Khan wrote:
http://www.cosmosmagazine.com/featur...rst?page=0%2C1 Nice detail article--Important long term work. Thanks. -Sam |
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Were early-generation Type Ia supenovae intrinsically brighterthantoday's?
Sam Wormley wrote:
On 12/23/09 5:05 AM, Yousuf Khan wrote: http://www.cosmosmagazine.com/featur...rst?page=0%2C1 Nice detail article--Important long term work. Thanks. -Sam And to think that the secret to figuring these supernovae out lay in internal combustion engine research. :-) Yousuf Khan |
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Were early-generation Type Ia supenovae intrinsically brighterthantoday's?
Yousuf Khan wrote:
Star burst | COSMOS magazine "Simulations developed by supernova expert Stan Woosley, also of UC Santa Cruz, along with Kasen, Fritz Röpke of the Max Planck Institute for Astrophysics in Garching, Germany, and others now suggest that supernovae that erupted a few billion years back in time may be different - intrinsically brighter - than those exploding today. The team has begun to identify several other features that may affect the brightness - such as how rapidly a star rotated before it exploded and its abundance of elements heavier than helium - which might confound dark energy measurements if overlooked." http://www.cosmosmagazine.com/featur...rst?page=0%2C1 If the need for Dark matter to fudge factor claimed accelerating expansion of the universe vanishes, do librarians go through Physical Review with a razor cutter? -- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz4.htm |
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Were early-generation Type Ia supenovae intrinsically brighter than today's?
Yousuf Khan wrote:
[...] This is good, post more stuff like this. Given that a Type 1a happens by the detonation [helium flash] of light elements accumulating on a white dwarf, the initial conditions for the supernovae are all remarkably similar and have comparatively small parameter spaces than compared to...every other supernova. |
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Were early-generation Type Ia supenovae intrinsically brighterthantoday's?
Uncle Al a écrit :
If the need for Dark matter to fudge factor claimed accelerating expansion of the universe vanishes, do librarians go through Physical Review with a razor cutter? Idiot |
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Were early-generation Type Ia supenovae intrinsically brighter thantoday's?
Uncle Al wrote:
Yousuf Khan wrote: Star burst | COSMOS magazine "Simulations developed by supernova expert Stan Woosley, also of UC Santa Cruz, along with Kasen, Fritz Röpke of the Max Planck Institute for Astrophysics in Garching, Germany, and others now suggest that supernovae that erupted a few billion years back in time may be different - intrinsically brighter - than those exploding today. The team has begun to identify several other features that may affect the brightness - such as how rapidly a star rotated before it exploded and its abundance of elements heavier than helium - which might confound dark energy measurements if overlooked." http://www.cosmosmagazine.com/featur...rst?page=0%2C1 If the need for Dark matter to fudge factor claimed accelerating expansion of the universe vanishes, do librarians go through Physical Review with a razor cutter? Dark matter is not dark energy, Al. But regardless...no, but that would make life more interesting if it were the case that there was a systematic error in the measurements of 1a supernovae that exactly corresponded to the apparent acceleration of the universe. It makes it even more interesting if you consider vacuum energy and the dark energy / dark matter fit (Lambda-CDM) to the CMB in the context of no accelerated expansion. |
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