Search FQXi


If you are aware of an interesting new academic paper (that has been published in a peer-reviewed journal or has appeared on the arXiv), a conference talk (at an official professional scientific meeting), an external blog post (by a professional scientist) or a news item (in the mainstream news media), which you think might make an interesting topic for an FQXi blog post, then please contact us at forums@fqxi.org with a link to the original source and a sentence about why you think that the work is worthy of discussion. Please note that we receive many such suggestions and while we endeavour to respond to them, we may not be able to reply to all suggestions.

Please also note that we do not accept unsolicited posts and we cannot review, or open new threads for, unsolicited articles or papers. Requests to review or post such materials will not be answered. If you have your own novel physics theory or model, which you would like to post for further discussion among then FQXi community, then please add them directly to the "Alternative Models of Reality" thread, or to the "Alternative Models of Cosmology" thread. Thank you.

Contests Home


Previous Contests

What Is “Fundamental”
October 28, 2017 to January 22, 2018
Sponsored by the Fetzer Franklin Fund and The Peter & Patricia Gruber Foundation
read/discusswinners

Wandering Towards a Goal
How can mindless mathematical laws give rise to aims and intention?
December 2, 2016 to March 3, 2017
Contest Partner: The Peter and Patricia Gruber Fund.
read/discusswinners

Trick or Truth: The Mysterious Connection Between Physics and Mathematics
Contest Partners: Nanotronics Imaging, The Peter and Patricia Gruber Foundation, and The John Templeton Foundation
Media Partner: Scientific American

read/discusswinners

How Should Humanity Steer the Future?
January 9, 2014 - August 31, 2014
Contest Partners: Jaan Tallinn, The Peter and Patricia Gruber Foundation, The John Templeton Foundation, and Scientific American
read/discusswinners

It From Bit or Bit From It
March 25 - June 28, 2013
Contest Partners: The Gruber Foundation, J. Templeton Foundation, and Scientific American
read/discusswinners

Questioning the Foundations
Which of Our Basic Physical Assumptions Are Wrong?
May 24 - August 31, 2012
Contest Partners: The Peter and Patricia Gruber Foundation, SubMeta, and Scientific American
read/discusswinners

Is Reality Digital or Analog?
November 2010 - February 2011
Contest Partners: The Peter and Patricia Gruber Foundation and Scientific American
read/discusswinners

What's Ultimately Possible in Physics?
May - October 2009
Contest Partners: Astrid and Bruce McWilliams
read/discusswinners

The Nature of Time
August - December 2008
read/discusswinners

Forum Home
Introduction
Terms of Use

Order posts by:
 chronological order
 most recent first

Posts by the author are highlighted in orange; posts by FQXi Members are highlighted in blue.

By using the FQXi Forum, you acknowledge reading and agree to abide by the Terms of Use

 RSS feed | RSS help
RECENT POSTS IN THIS TOPIC

Eckard Blumschein: on 11/5/09 at 23:23pm UTC, wrote Dear Navin, In order to reach a wider audience, couldn't you try and take...

Narendra Nath: on 10/30/09 at 17:29pm UTC, wrote Dear navin, i attempted the hard job of going through your essay when i...

Lawrence B. Crowell: on 10/2/09 at 22:16pm UTC, wrote I have only given this a skim reading so far, but this looks like a pretty...

Navin Sivanandam: on 10/2/09 at 10:54am UTC, wrote Essay Abstract The anthropic principle is an inevitable constraint...


RECENT FORUM POSTS

Eric Aspling: "Hi Georgina, The "illusion" is simply a catch phrase associated with..." in The Nature of Time

amrit: "God Particle has died. https://www.amazon.com/dp/1797718037" in Spot the Difference to...

Robert McEachern: "Georgina, "thereby altering them by the process of sorting." Exactly...." in The Nature of Time

Marcel-Marie LeBel: "The lesson of the second law is that it is a one way street. Trying to show..." in Information as Fuel — A...

Amrit Sorli: "The Truth is that "God Particle" is dead." in Gravity's Residue

Sunil Sharma: "Really very happy to say,your post is very interesting to read. Online..." in FQXi'ers Debate the Deep...

Joe Fisher: "Dear Dr. Kuhn, Today’s Closer To Truth Facebook page contained this..." in Gravity's Residue

Roger Fedrer: "If people can act as individual agents,"—with free will—"this will..." in Constructing a Theory of...


RECENT ARTICLES
click titles to read articles

Gravity's Residue
An unusual approach to unifying the laws of physics could solve Hawking's black-hole information paradox—and its predicted gravitational "memory effect" could be picked up by LIGO.

Could Mind Forge the Universe?
Objective reality, and the laws of physics themselves, emerge from our observations, according to a new framework that turns what we think of as fundamental on its head.

Dissolving Quantum Paradoxes
The impossibility of building a perfect clock could help explain away microscale weirdness.

Constructing a Theory of Life
An all-encompassing framework of physics could help to explain the evolution of consciousness, intelligence, and free will.

Usurping Quantum Theory
The search is on for a fundamental framework that allows for even stranger links between particles than quantum theory—which could lead us to a theory of everything.


FQXi FORUM
February 23, 2019

CATEGORY: What's Ultimately Possible in Physics? Essay Contest (2009) [back]
TOPIC: A Computational Anthropic Principle: Where is the Hardest Problem in the Multiverse? by Navin Sivanandam [refresh]
Bookmark and Share
Login or create account to post reply or comment.

Author Navin Sivanandam wrote on Oct. 2, 2009 @ 10:54 GMT
Essay Abstract

The anthropic principle is an inevitable constraint on the space of possible theories. As such it is central to determining the limits of physics. In particular, we contend that what is ultimately possible in physics is determined by restrictions on the computational capacity of the universe, and that observers are more likely to be found where more complicated calculations are possible. Our discussion covers the inevitability of theoretical bias and how anthropics and computation can be an aid to imposing these biases on the theory landscape in a systematic way. Further, we argue for (as far as possible) top-down rather than bottom-up anthropic measures, contending that that the latter can often be misleading. We begin the construction of an explicit computational measure by examining the effect of the cosmological constant on computational bounds in a given universe, drawing from previous work on using entropy production as a proxy for observers by Bousso, Harnik, Kribs and Perez. In addition, we highlight a few of the additional computational considerations that may be used to extend such a measure.

Author Bio

Navin Sivanandam received his PhD from Stanford University in 2008. He now works as a postdoc in the Theory Group at the the University of Texas at Austin, with his research focusing on string theory and cosmology. He also believes that foundational questions in physics are best discussed during the twilight hours over a fine single malt.

Download Essay PDF File

Bookmark and Share



Lawrence B. Crowell wrote on Oct. 2, 2009 @ 22:16 GMT
I have only given this a skim reading so far, but this looks like a pretty good essay. This has implications it seem for the information theoretic nature of the cosmological constant. Abhijnan Rej wrote a good paper on the computatibility of the cosmological constant:

http://www.fqxi.org/community/forum/topic/505

I propose the cosmological constant is due to the occurrence of a quantum critical point or quantum phase transition in

http://www.fqxi.org/community/forum/topic/494

I will give this a closer read over the next few days.

Cheers LC

Bookmark and Share
report post as inappropriate


Narendra Nath wrote on Oct. 30, 2009 @ 17:29 GMT
Dear navin,

i attempted the hard job of going through your essay when i knew i hardly even comprehend your abstract. What i find now is that your approach is a kind of basic computational approach. It assumes in a way that the universe got created and evolved basically in a probalistic manner. Entropy then governs its evlotion completely.

However, the nature shows many symmetries too and then there are breakdown of some symmetries in isolated processes. May be yours is a kind of review of the topic chosen with not much of your own study and conclusions.Whatever little i have understood about Cosmology, to me it seems that it bears out the entire Physics from Particle Physics to Condensed matter physics. Nature being natural has to be simple, as per my imagination. What makes it complex is entirely due to we physicists. That is why i really enjoyed the last sentence of your essay, as it hit me to the inner core. What we humans are doing is just what our minds lead us to after all our sensors have given their respective signals for analysis and scrutiny and whatever background knowledge we have gained through our 'education'and the professional exposure/experience.

Are vwe free enough and unbiased to innovate Physics, rather than just extend it further with our base knowledge? The Big names in olden days Physics were all true innovators but today we mostly seem to extend their works through corrolleries. It may be my wrong impression but that is what is getting reflected in Nobel awards for life-time works or its implications reaching a huge economic or material gains! Physics in the early days was a purer persuit for academic curiousity and fulfilment of self persuits for common uplift of the standards of knowledge. But then xhange is the rule of nature and may be the new times will bring greater satisfaction to the human beings at large.

Bookmark and Share
report post as inappropriate


Eckard Blumschein wrote on Nov. 5, 2009 @ 23:23 GMT
Dear Navin,

In order to reach a wider audience, couldn't you try and take issue concerning unseen deficits of theories as did I? Maybe you are able to refute 527.

Regards,

Eckard

Bookmark and Share
report post as inappropriate


Login or create account to post reply or comment.

Please enter your e-mail address:
Note: Joining the FQXi mailing list does not give you a login account or constitute membership in the organization.