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	<title>Comments on: Philosophy and Cosmology: Day Three</title>
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	<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/</link>
	<description>Random samplings from a universe of ideas.</description>
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		<title>By: Alain A.</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-99700</link>
		<dc:creator>Alain A.</dc:creator>
		<pubDate>Mon, 28 Sep 2009 18:53:11 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-99700</guid>
		<description>Ian, most scientists are not interested in debating with the religious, which is why you won&#039;t see much reaction to your comments here.  Reason cannot be applied to theology, because theology requires faith, and faith cannot be explained rationally. Those are two very separate domains.   The problem with scientists is that they often let people like you get away with disseminating the idea that religion has to do with science to the masses without reacting and that&#039;s why, in the end, you win - because no one answers.  And no one will answer to the obscenity you just posted, except me, because I&#039;m not a scientist hehehe.  Their attitude is comparable to an adult with children - after 25 questions, sometimes the only answer is &quot;yes, my dear, yes yes&quot; in order to be able to pursue with more serious work :)</description>
		<content:encoded><![CDATA[<p>Ian, most scientists are not interested in debating with the religious, which is why you won&#8217;t see much reaction to your comments here.  Reason cannot be applied to theology, because theology requires faith, and faith cannot be explained rationally. Those are two very separate domains.   The problem with scientists is that they often let people like you get away with disseminating the idea that religion has to do with science to the masses without reacting and that&#8217;s why, in the end, you win &#8211; because no one answers.  And no one will answer to the obscenity you just posted, except me, because I&#8217;m not a scientist hehehe.  Their attitude is comparable to an adult with children &#8211; after 25 questions, sometimes the only answer is &#8220;yes, my dear, yes yes&#8221; in order to be able to pursue with more serious work <img src='http://blogs.discovermagazine.com/cosmicvariance/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' /> </p>
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		<title>By: Ian</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-99625</link>
		<dc:creator>Ian</dc:creator>
		<pubDate>Mon, 28 Sep 2009 16:22:00 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-99625</guid>
		<description>@25 Again late in the day so I appreciate you may not see this response. 

&quot;Lemaitre always emphasised that it was scientific reasoning not his religion that let to his proposing an expanding universe.&quot; I agree - but you cannot deny that he was a theologian too, who just happened to come up with the answer. If you apply reason in science then you apply reason in theology.</description>
		<content:encoded><![CDATA[<p>@25 Again late in the day so I appreciate you may not see this response. </p>
<p>&#8220;Lemaitre always emphasised that it was scientific reasoning not his religion that let to his proposing an expanding universe.&#8221; I agree &#8211; but you cannot deny that he was a theologian too, who just happened to come up with the answer. If you apply reason in science then you apply reason in theology.</p>
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		<title>By: Ian</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-99624</link>
		<dc:creator>Ian</dc:creator>
		<pubDate>Mon, 28 Sep 2009 16:18:26 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-99624</guid>
		<description>@22 - This is late in the day so I you may not see this response.

&quot;...but “creation out of nothing” is a fairly simple concept to understand&quot;. But sadly Einstein didn&#039;t get it, and neither did Hoyle. Was it so simple to understand?</description>
		<content:encoded><![CDATA[<p>@22 &#8211; This is late in the day so I you may not see this response.</p>
<p>&#8220;&#8230;but “creation out of nothing” is a fairly simple concept to understand&#8221;. But sadly Einstein didn&#8217;t get it, and neither did Hoyle. Was it so simple to understand?</p>
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		<title>By: chemicalscum</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-99179</link>
		<dc:creator>chemicalscum</dc:creator>
		<pubDate>Sun, 27 Sep 2009 00:21:53 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-99179</guid>
		<description>@17

Lemaitre always emphasised that it was scientific reasoning not his religion that let to his proposing an expanding universe.  When asked where in science one might find evidence for God, he thought about it for some time and finally replied &quot;psychology&quot;.

It seems to me that Lemaitre was a good mathematical relativist who followed relativity theory where it leads.  Perhaps Everett taking QM seriously is similar in that sense.</description>
		<content:encoded><![CDATA[<p>@17</p>
<p>Lemaitre always emphasised that it was scientific reasoning not his religion that let to his proposing an expanding universe.  When asked where in science one might find evidence for God, he thought about it for some time and finally replied &#8220;psychology&#8221;.</p>
<p>It seems to me that Lemaitre was a good mathematical relativist who followed relativity theory where it leads.  Perhaps Everett taking QM seriously is similar in that sense.</p>
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		<title>By: Tina</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-98305</link>
		<dc:creator>Tina</dc:creator>
		<pubDate>Thu, 24 Sep 2009 18:04:19 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-98305</guid>
		<description>Some of the ideas about multiple universes are very questionable. And the problem is created by scientists who  do not differentiate between observable phenomenon versus theoretically unobservable phenomenon that is not theoretically necessary (i.e. fiction).  I could give many examples but just read Thomas Neil Neubert&#039;s new book A Critique of Pure Physics. He calls 11-dimensional spacetime sound; but he calls overzealous mathematical extrapolation fantasy physics.  He gets very specific, suggesting that LIGO is the most important null experiments since Michelson-Morley; and he gives a simple and convincing calculation that shows that the gravitational redshift is sufficient to account for Hubble&#039;s law. I wish someone with more credibility than me would comment on this calculation; because it he is right; it changes everything. My point is that science, when it doesn&#039;t stick to the science and begins to talk about the fiction i.e. time travel and mutliple parallel universe in which an almost identicle copy of you and me exist; well science just does itself a disservice and looses credibility and becomes a modern form of alchemy or astrology.</description>
		<content:encoded><![CDATA[<p>Some of the ideas about multiple universes are very questionable. And the problem is created by scientists who  do not differentiate between observable phenomenon versus theoretically unobservable phenomenon that is not theoretically necessary (i.e. fiction).  I could give many examples but just read Thomas Neil Neubert&#8217;s new book A Critique of Pure Physics. He calls 11-dimensional spacetime sound; but he calls overzealous mathematical extrapolation fantasy physics.  He gets very specific, suggesting that LIGO is the most important null experiments since Michelson-Morley; and he gives a simple and convincing calculation that shows that the gravitational redshift is sufficient to account for Hubble&#8217;s law. I wish someone with more credibility than me would comment on this calculation; because it he is right; it changes everything. My point is that science, when it doesn&#8217;t stick to the science and begins to talk about the fiction i.e. time travel and mutliple parallel universe in which an almost identicle copy of you and me exist; well science just does itself a disservice and looses credibility and becomes a modern form of alchemy or astrology.</p>
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		<title>By: Arun</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97901</link>
		<dc:creator>Arun</dc:creator>
		<pubDate>Wed, 23 Sep 2009 17:46:42 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97901</guid>
		<description>Best comment award: my vote goes to Thomas Larsson.</description>
		<content:encoded><![CDATA[<p>Best comment award: my vote goes to Thomas Larsson.</p>
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		<title>By: Alain A.</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97897</link>
		<dc:creator>Alain A.</dc:creator>
		<pubDate>Wed, 23 Sep 2009 17:22:01 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97897</guid>
		<description>@17: &quot;Religion takes a great deal of understanding&quot;.  

You may have other examples, but &quot;creation out of nothing&quot; is a fairly simple concept to understand.  I don&#039;t see anything complicated in the answers provided by religion.  Its very language, across all religions, is simple and aims to convince the largest audience possible.  See Vatican&#039;s bank account or televized preachers in the USA to confirm this.

The debate here is highly scientific - I didn&#039;t want to divert from this, only trying to see if you guys agree on the limits of our imagination and brains, and thus conclude to the possibility that the search for truth may be pointless because our tools are biased.</description>
		<content:encoded><![CDATA[<p>@17: &#8220;Religion takes a great deal of understanding&#8221;.  </p>
<p>You may have other examples, but &#8220;creation out of nothing&#8221; is a fairly simple concept to understand.  I don&#8217;t see anything complicated in the answers provided by religion.  Its very language, across all religions, is simple and aims to convince the largest audience possible.  See Vatican&#8217;s bank account or televized preachers in the USA to confirm this.</p>
<p>The debate here is highly scientific &#8211; I didn&#8217;t want to divert from this, only trying to see if you guys agree on the limits of our imagination and brains, and thus conclude to the possibility that the search for truth may be pointless because our tools are biased.</p>
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		<title>By: Cartesian</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97727</link>
		<dc:creator>Cartesian</dc:creator>
		<pubDate>Wed, 23 Sep 2009 09:04:22 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97727</guid>
		<description>&quot;Remember history: August Comte in 1859 scoffed at the idea we would ever know what stars were made of.&quot;

August Comte was a positivist like too much French are, “In God they do not trust”, so it is difficult to be a scientist in the field of quantum mechanics in this country for some reasons which are well explained by Heisenberg, see : 

http://eternal-cartesian.blogspot.com/2009/08/heisenberg-and-god.html</description>
		<content:encoded><![CDATA[<p>&#8220;Remember history: August Comte in 1859 scoffed at the idea we would ever know what stars were made of.&#8221;</p>
<p>August Comte was a positivist like too much French are, “In God they do not trust”, so it is difficult to be a scientist in the field of quantum mechanics in this country for some reasons which are well explained by Heisenberg, see : </p>
<p><a href="http://eternal-cartesian.blogspot.com/2009/08/heisenberg-and-god.html" rel="nofollow">http://eternal-cartesian.blogspot.com/2009/08/heisenberg-and-god.html</a></p>
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		<title>By: Thomas Larsson</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97717</link>
		<dc:creator>Thomas Larsson</dc:creator>
		<pubDate>Wed, 23 Sep 2009 08:34:40 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97717</guid>
		<description>The anthropic explanation of the Michelson-Morley experiment: human life is incompatible with non-zero ether wind. Surely the multiverse idea has explanatory power :-)</description>
		<content:encoded><![CDATA[<p>The anthropic explanation of the Michelson-Morley experiment: human life is incompatible with non-zero ether wind. Surely the multiverse idea has explanatory power <img src='http://blogs.discovermagazine.com/cosmicvariance/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' /> </p>
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		<title>By: Cranks Anonymous &#171; In the Dark</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97715</link>
		<dc:creator>Cranks Anonymous &#171; In the Dark</dc:creator>
		<pubDate>Wed, 23 Sep 2009 08:18:27 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97715</guid>
		<description>[...] around a series of debates on topics of current interest. See Sean&#8217;s posts here, here and here for expert summaries of the three days of the [...]</description>
		<content:encoded><![CDATA[<p>[...] around a series of debates on topics of current interest. See Sean&#8217;s posts here, here and here for expert summaries of the three days of the [...]</p>
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		<title>By: Arrow</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97705</link>
		<dc:creator>Arrow</dc:creator>
		<pubDate>Wed, 23 Sep 2009 07:53:25 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97705</guid>
		<description>&quot;Don’t get too wedded to particular criteria for distinguishing science from non-science; it leads to later regrets when you want to do something perfectly scientific that doesn’t quite fit your criterion. The problem with pseudosciences is not that they don’t make predictions; it’s that they always change to accommodate new information. “Falsifiability” is a great slogan and an irresistible sound bite, but not a reliable rule to separate science from non-science.&quot;

Perfect victory for Templeton Foundation.</description>
		<content:encoded><![CDATA[<p>&#8220;Don’t get too wedded to particular criteria for distinguishing science from non-science; it leads to later regrets when you want to do something perfectly scientific that doesn’t quite fit your criterion. The problem with pseudosciences is not that they don’t make predictions; it’s that they always change to accommodate new information. “Falsifiability” is a great slogan and an irresistible sound bite, but not a reliable rule to separate science from non-science.&#8221;</p>
<p>Perfect victory for Templeton Foundation.</p>
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		<title>By: Ian</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97703</link>
		<dc:creator>Ian</dc:creator>
		<pubDate>Wed, 23 Sep 2009 07:44:34 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97703</guid>
		<description>@16, &quot;... religion and pseudoscience: it requires little effort to understand&quot;

Just on the religion since I&#039;m not into pseudoscience either - I doubt very much whether the many many scientists who were/are religious would agree with this statement. Religion takes a great deal of understanding. Just by way of one example where it &#039;beat&#039; science - creation out of nothing. 

I don&#039;t think it was any coincidence that it was Lemaitre - a Catholic priest - who helped to put cosmology back on track by proposing an expanding universe. His search was fruitful precisely because he was looking in the right place - a place already proposed by the Church.

But to use &#039;beat&#039; would be wrong too - science and theology are friends. Examine both and you will see that they have a lot to say to each other, always have done, always will.</description>
		<content:encoded><![CDATA[<p>@16, &#8220;&#8230; religion and pseudoscience: it requires little effort to understand&#8221;</p>
<p>Just on the religion since I&#8217;m not into pseudoscience either &#8211; I doubt very much whether the many many scientists who were/are religious would agree with this statement. Religion takes a great deal of understanding. Just by way of one example where it &#8216;beat&#8217; science &#8211; creation out of nothing. </p>
<p>I don&#8217;t think it was any coincidence that it was Lemaitre &#8211; a Catholic priest &#8211; who helped to put cosmology back on track by proposing an expanding universe. His search was fruitful precisely because he was looking in the right place &#8211; a place already proposed by the Church.</p>
<p>But to use &#8216;beat&#8217; would be wrong too &#8211; science and theology are friends. Examine both and you will see that they have a lot to say to each other, always have done, always will.</p>
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		<title>By: Alain A.</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97650</link>
		<dc:creator>Alain A.</dc:creator>
		<pubDate>Wed, 23 Sep 2009 05:18:43 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97650</guid>
		<description>I have very little knowledge of physics, astrophysics and most of what is discussed here, but I have one question that seems important.  Let me first state a fact: human imagination is limited.  For example, we are unable to imagine a new colour.  That is an indisputable fact.  If you agree to this, would you then agree that the truth you all seem to be gloriously seeking may be beyond  the limits of our imagination and beyond our capacity to understand it?  I mean to say that if tomorrow a super being (call him God or whatever) descended upon us and explained in details *everything*, don&#039;t you think that you would simply not understand it, even the most brilliants of your group?   

I&#039;d love to know if you agree that this scenario is a possibility, the fact stated above, and if yes, to what level it is probable.  If you do, does it change anything in your research, and aren&#039;t you lacking a lot of modesty and wisdom trying to figure out something that is most probably impossible for your limited brains to deduce, or worse, to understand even if it was all handed out to you?

Or maybe lack of modesty is an essential quality for people who try to answer questions that men have been asking themselves since the dawn of time?

About pseudoscience or religion: it explains everything, like a poster said above, and that&#039;s precisely why it&#039;s garbage, because our imagination is able to grasp everything they describe.  This is also why so many men on Earth love religion and pseudoscience: it requires little effort to understand.  On the contrary, General Relativity, Special Relativity, Quantum Physics or String Theory are all much harder to grasp.  They are often counter-intuitive and thus, defy the limits of our imagination.  It was said of Relativity that only two men understood it on the planet many years after it was published.  Quantum Physics still cannot explain scientifically observable phenomenons such as the EPR paradox, to give just one example.  Even though our human brain was able to produce such gems, my point still stands: whatever our imagination and our brains produce in terms of an explanation is bound to be limited by the design of our brains.   

I wonder if any scientist has ever come to the same conclusion, committing suicide shortly after.

** If I made scientific errors in this post, please excuse my lack of knowledge and please do point them out to me.</description>
		<content:encoded><![CDATA[<p>I have very little knowledge of physics, astrophysics and most of what is discussed here, but I have one question that seems important.  Let me first state a fact: human imagination is limited.  For example, we are unable to imagine a new colour.  That is an indisputable fact.  If you agree to this, would you then agree that the truth you all seem to be gloriously seeking may be beyond  the limits of our imagination and beyond our capacity to understand it?  I mean to say that if tomorrow a super being (call him God or whatever) descended upon us and explained in details *everything*, don&#8217;t you think that you would simply not understand it, even the most brilliants of your group?   </p>
<p>I&#8217;d love to know if you agree that this scenario is a possibility, the fact stated above, and if yes, to what level it is probable.  If you do, does it change anything in your research, and aren&#8217;t you lacking a lot of modesty and wisdom trying to figure out something that is most probably impossible for your limited brains to deduce, or worse, to understand even if it was all handed out to you?</p>
<p>Or maybe lack of modesty is an essential quality for people who try to answer questions that men have been asking themselves since the dawn of time?</p>
<p>About pseudoscience or religion: it explains everything, like a poster said above, and that&#8217;s precisely why it&#8217;s garbage, because our imagination is able to grasp everything they describe.  This is also why so many men on Earth love religion and pseudoscience: it requires little effort to understand.  On the contrary, General Relativity, Special Relativity, Quantum Physics or String Theory are all much harder to grasp.  They are often counter-intuitive and thus, defy the limits of our imagination.  It was said of Relativity that only two men understood it on the planet many years after it was published.  Quantum Physics still cannot explain scientifically observable phenomenons such as the EPR paradox, to give just one example.  Even though our human brain was able to produce such gems, my point still stands: whatever our imagination and our brains produce in terms of an explanation is bound to be limited by the design of our brains.   </p>
<p>I wonder if any scientist has ever come to the same conclusion, committing suicide shortly after.</p>
<p>** If I made scientific errors in this post, please excuse my lack of knowledge and please do point them out to me.</p>
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		<title>By: Haelfix</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97639</link>
		<dc:creator>Haelfix</dc:creator>
		<pubDate>Wed, 23 Sep 2009 04:18:56 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97639</guid>
		<description>I&#039;d say the majority of physicists generally hate the idea of a multiverse.  The illdefined measures, the arbitrariness and the lack of selection dynamics is really rather aggravating.

It&#039;s like an itch that we can&#039;t scratch and that won&#039;t go away.  The problem is, many of us have a nagging feeling that its probably true in some sense.

Sometimes, the places that physics leads you, you just have to sigh and roll with it.  Like the discovery of the Muon..</description>
		<content:encoded><![CDATA[<p>I&#8217;d say the majority of physicists generally hate the idea of a multiverse.  The illdefined measures, the arbitrariness and the lack of selection dynamics is really rather aggravating.</p>
<p>It&#8217;s like an itch that we can&#8217;t scratch and that won&#8217;t go away.  The problem is, many of us have a nagging feeling that its probably true in some sense.</p>
<p>Sometimes, the places that physics leads you, you just have to sigh and roll with it.  Like the discovery of the Muon..</p>
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		<title>By: Steve Esser</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97422</link>
		<dc:creator>Steve Esser</dc:creator>
		<pubDate>Tue, 22 Sep 2009 15:48:54 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97422</guid>
		<description>Thanks very much for blogging the conference.</description>
		<content:encoded><![CDATA[<p>Thanks very much for blogging the conference.</p>
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		<title>By: Aiya-Oba</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97419</link>
		<dc:creator>Aiya-Oba</dc:creator>
		<pubDate>Tue, 22 Sep 2009 15:41:49 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97419</guid>
		<description>Our Universe is a unit of multiverse in the infinitude of Spacetime.</description>
		<content:encoded><![CDATA[<p>Our Universe is a unit of multiverse in the infinitude of Spacetime.</p>
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		<title>By: George Dugdale</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97403</link>
		<dc:creator>George Dugdale</dc:creator>
		<pubDate>Tue, 22 Sep 2009 15:00:46 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97403</guid>
		<description>I really enjoyed the philosophy and Cosmology conference thoughts. Thoughts that are derived from your mathematical abilities. Those abilities allow lay people, like myself,  to be brought to the very interface between what is provable and what is beyond proof. I have the same frustration as Robert Bransonberger ...&quot;the need to consider modes with wavelenghts shorter than Planck&#039;s length&quot;. Frustration that we can&#039;t stretch our measurement abilities beyond the shortest gamma ray or longest radio wave. We can only hope that there is &quot;cross talk&quot; at the extreme ends of the electromagnetic wavelength spectrum between univereses that might provide us with indirect evidence that there are other universes.</description>
		<content:encoded><![CDATA[<p>I really enjoyed the philosophy and Cosmology conference thoughts. Thoughts that are derived from your mathematical abilities. Those abilities allow lay people, like myself,  to be brought to the very interface between what is provable and what is beyond proof. I have the same frustration as Robert Bransonberger &#8230;&#8221;the need to consider modes with wavelenghts shorter than Planck&#8217;s length&#8221;. Frustration that we can&#8217;t stretch our measurement abilities beyond the shortest gamma ray or longest radio wave. We can only hope that there is &#8220;cross talk&#8221; at the extreme ends of the electromagnetic wavelength spectrum between univereses that might provide us with indirect evidence that there are other universes.</p>
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		<title>By: Sean</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97395</link>
		<dc:creator>Sean</dc:creator>
		<pubDate>Tue, 22 Sep 2009 14:13:08 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97395</guid>
		<description>John, George&#039;s point was simply that a prediction like that isn&#039;t from &quot;the multiverse,&quot; it&#039;s from a specific implementation of the multiverse idea.  In particular, Weinberg had to assume a set of things about distributions of parameters:  a flat distribution for the cosmological constant and no variation in anything else.  You could have a multiverse theory with some very different prior distribution of values, which would have led to a different prediction.</description>
		<content:encoded><![CDATA[<p>John, George&#8217;s point was simply that a prediction like that isn&#8217;t from &#8220;the multiverse,&#8221; it&#8217;s from a specific implementation of the multiverse idea.  In particular, Weinberg had to assume a set of things about distributions of parameters:  a flat distribution for the cosmological constant and no variation in anything else.  You could have a multiverse theory with some very different prior distribution of values, which would have led to a different prediction.</p>
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		<title>By: John Peacock</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97393</link>
		<dc:creator>John Peacock</dc:creator>
		<pubDate>Tue, 22 Sep 2009 14:04:48 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97393</guid>
		<description>You quote George Ellis as saying &quot;The multiverse theory can’t make any prediction because it can explain anything at all&quot;. Hogwash, to put it politely. Anyone who thinks this should read Weinberg&#039;s classic 1989 paper in RMP where he explicitly points out that an inevitable consequence of the anthropic viewpoint is that Lambda should be non-zero at roughly the level we now observe. At the time, models with Lambda were not favoured by any serious evidence (that first came in 1990, with the APM clustering measurements that disfavoured an Einstein-de Sitter universe, plus CMB upper limits). So the multiverse made one of the biggest and boldest predictions in physics - which was confirmed. How can anyone say this is a retreat from testable science?</description>
		<content:encoded><![CDATA[<p>You quote George Ellis as saying &#8220;The multiverse theory can’t make any prediction because it can explain anything at all&#8221;. Hogwash, to put it politely. Anyone who thinks this should read Weinberg&#8217;s classic 1989 paper in RMP where he explicitly points out that an inevitable consequence of the anthropic viewpoint is that Lambda should be non-zero at roughly the level we now observe. At the time, models with Lambda were not favoured by any serious evidence (that first came in 1990, with the APM clustering measurements that disfavoured an Einstein-de Sitter universe, plus CMB upper limits). So the multiverse made one of the biggest and boldest predictions in physics &#8211; which was confirmed. How can anyone say this is a retreat from testable science?</p>
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		<title>By: mark a. thomas</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2009/09/22/philosophy-and-cosmology-day-three/comment-page-1/#comment-97384</link>
		<dc:creator>mark a. thomas</dc:creator>
		<pubDate>Tue, 22 Sep 2009 13:51:42 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/?p=2685#comment-97384</guid>
		<description>The &#039;multiverse&#039; idea just makes everything arbritrary, fuzzy and metaphysical. One you have to consider that if true our calculations of fundamental constants are then arbritrary and noncomputable. Second you might have to consider that the &#039;Real Number&#039; spaces in each of the branch offs of universes are different. Our Real number space has the property that 1^2 + 2^2 ...+ 24^2 = 70^2. This is a computable perfect square property that is unique. If this is the same in the other universes then all symmetry constructions are identical and the point of multiverses is moot. If you consider that energy conditions are different in the branches then how can there be a stable connection if symmetry constructions are different? Modifications in certain constants changes what we percieve to be the Planck scale. If there ever was something like a multiverse it pinched off and is unknowable and of no consequence.</description>
		<content:encoded><![CDATA[<p>The &#8216;multiverse&#8217; idea just makes everything arbritrary, fuzzy and metaphysical. One you have to consider that if true our calculations of fundamental constants are then arbritrary and noncomputable. Second you might have to consider that the &#8216;Real Number&#8217; spaces in each of the branch offs of universes are different. Our Real number space has the property that 1^2 + 2^2 &#8230;+ 24^2 = 70^2. This is a computable perfect square property that is unique. If this is the same in the other universes then all symmetry constructions are identical and the point of multiverses is moot. If you consider that energy conditions are different in the branches then how can there be a stable connection if symmetry constructions are different? Modifications in certain constants changes what we percieve to be the Planck scale. If there ever was something like a multiverse it pinched off and is unknowable and of no consequence.</p>
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