Re: It's possible dark energy isn't as powerful as we thought
On 4/15/2015 2:00 AM, LizR wrote: Assuming there isn't a future discovery that supernovae operated differently in the early universe, then yes these results mean dark energy isn't as powerful as thought, but it's still there. I'm not sure what the flatness measurement indicates, in terms of global deceleration-vs-acceleration. Is this like the way we used to think of a flat universe (one that is exactly balanced between expansion and collapse) or has flatness been redefined? I wouldn't expect a universe with a cosmological constant to be flat, but hyperbolic. (Or is that idea a bit exaggerated?) It can be spatially flat but expand as ~sinh(t). Brent -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: It's possible dark energy isn't as powerful as we thought
Assuming there isn't a future discovery that supernovae operated differently in the early universe, then yes these results mean dark energy isn't as powerful as thought, but it's still there. I'm not sure what the flatness measurement indicates, in terms of global deceleration-vs-acceleration. Is this like the way we used to think of a flat universe (one that is exactly balanced between expansion and collapse) or has flatness been redefined? I wouldn't expect a universe with a cosmological constant to be flat, but hyperbolic. (Or is that idea a bit exaggerated?) -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: It's possible dark energy isn't as powerful as we thought
Yes, but the WMAP nobelists in 1997 claimed that it proved an increased acceleration. My head is flat so based on that... -Original Message- From: LizR lizj...@gmail.com To: everything-list everything-list@googlegroups.com Sent: Mon, Apr 13, 2015 7:25 pm Subject: Re: It's possible dark energy isn't as powerful as we thought I have been given the impression that the universe is flat - I assume this means in the sense of having no (or at least too small to measure) overall curvature. Hence, if there is no acceleration, whether it's open or closed is, as it were, an open question! On 14 April 2015 at 10:42, spudboy100 via Everything List everything-list@googlegroups.com wrote: Or not powerful enough to keep the universe expanding unto dissipation? -Original Message- From: LizR lizj...@gmail.com To: everything-list everything-list@googlegroups.com Sent: Mon, Apr 13, 2015 6:40 pm Subject: It's possible dark energy isn't as powerful as we thought ...or maybe nonexistent, even??? http://motherboard.vice.com/read/the-universe-might-be-expanding-a-lot-slower-than-we-thought -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: It's possible dark energy isn't as powerful as we thought
On Mon, Apr 13, 2015 LizR lizj...@gmail.com wrote: I have been given the impression that the universe is flat - I assume this means in the sense of having no (or at least too small to measure) overall curvature. Hence, if there is no acceleration, whether it's open or closed is, as it were, an open question! Nobody is saying that the universe isn't accelerating, if these new results hold up it just means that it isn't accelerating quite as fast as previously thought. John K Clark On 14 April 2015 at 10:42, spudboy100 via Everything List everything-list@googlegroups.com wrote: Or not powerful enough to keep the universe expanding unto dissipation? -Original Message- From: LizR lizj...@gmail.com To: everything-list everything-list@googlegroups.com Sent: Mon, Apr 13, 2015 6:40 pm Subject: It's possible dark energy isn't as powerful as we thought ...or maybe nonexistent, even??? http://motherboard.vice.com/read/the-universe-might-be-expanding-a-lot-slower-than-we-thought -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: It's possible dark energy isn't as powerful as we thought
On Tue, Apr 14, 2015 spudboy100 via Everything List everything-list@googlegroups.com wrote: Yes, but the WMAP nobelists in 1997 claimed that it proved an increased acceleration. In 2003 Adam Riess presented observational evidence that although the universe is 13.8 billion years old for most of that time it was actually decelerating, it only started to accelerate 5 billion years ago. This makes sense because long ago the matter density of the universe was greater than now so matter's gravity would tend to slow the expansion, and Dark Energy which works in the opposite direction with a sort of anti-gravity effect comes from space itself, and long ago there was less space than now. The technical term for a change in acceleration is a jerk; in 2003 The New York Times ran a headline COSMIC JERK DISCOVERED, underneath that was a large picture of Adam Riess. His colleagues have never let him forget it. John K Clark -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
It's possible dark energy isn't as powerful as we thought
...or maybe nonexistent, even??? http://motherboard.vice.com/read/the-universe-might-be-expanding-a-lot-slower-than-we-thought -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: It's possible dark energy isn't as powerful as we thought
I have been given the impression that the universe is flat - I assume this means in the sense of having no (or at least too small to measure) overall curvature. Hence, if there is no acceleration, whether it's open or closed is, as it were, an open question! On 14 April 2015 at 10:42, spudboy100 via Everything List everything-list@googlegroups.com wrote: Or not powerful enough to keep the universe expanding unto dissipation? -Original Message- From: LizR lizj...@gmail.com To: everything-list everything-list@googlegroups.com Sent: Mon, Apr 13, 2015 6:40 pm Subject: It's possible dark energy isn't as powerful as we thought ...or maybe nonexistent, even??? http://motherboard.vice.com/read/the-universe-might-be-expanding-a-lot-slower-than-we-thought -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: It's possible dark energy isn't as powerful as we thought
Or not powerful enough to keep the universe expanding unto dissipation? -Original Message- From: LizR lizj...@gmail.com To: everything-list everything-list@googlegroups.com Sent: Mon, Apr 13, 2015 6:40 pm Subject: It's possible dark energy isn't as powerful as we thought ...or maybe nonexistent, even??? http://motherboard.vice.com/read/the-universe-might-be-expanding-a-lot-slower-than-we-thought -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
