Matryoshka World


Friday, September 13, 2013

Data Opens Possibility Of A Curved Cosmos


 This article at livescience.com discusses recent data from the Planck satellite launched by the European Space Agency in 2009 that supports the existence of the same anomaly NASA's Wilkinson Microwave Anisotropy Probe (WMAP), launched in 2001, found.  The Wilkinson data unexpectedly suggested that the universe may be lopsided — hot and cold spots on one side of the cosmos appear hotter and colder than on the other. One explanation for the data is that the universe is curved, or saddle shaped.  From the article:
Researchers investigating a major anomaly in the afterglow of the Big Bang suggest the fabric of space and time may actually be curved like a saddle, possibly upending the currently leading notion that light and anything else traveling through spacetime zips through a "flat" universe in straight lines. In a saddle-shaped universe, however, any object that seems like it is traveling parallel to another item will actually veer away from it after vast distances.
Andrew Liddle, a cosmologist at the University of Edinburgh in Scotland Liddle and his colleague Marina Cortês detail their findings in the Sept. 13 issue of the journal Physical Review Letters.



Thursday, August 22, 2013

A New Theory of Consciousness




In an article published in Aeon Magazine, Michael Graziano presents a new theory of consciousness.  His theory is that the evolution of attention was a useful data handling mechanism in brains that became more complex over time.  Further, "Attention requires control. In the modern study of robotics there is something called control theory, and it teaches us that, if a machine such as a brain is to control something, it helps to have an internal model of that thing."  Graziano proceeds to explain his theory:


The brain will attribute a property to itself and that property will be a simplified proxy for attention. It won’t be precisely accurate, but it will convey useful information. What exactly is that property? When it is paying attention to thing X, we know that the brain usually attributes an experience of X to itself — the property of being conscious, or awareof something. Why? Because that attribution helps to keep track of the ever-changing focus of attention...I call this the ‘attention schema theory’. It has a very simple idea at its heart: that consciousness is a schematic model of one’s state of attention. Early in evolution, perhaps hundreds of millions of years ago, brains evolved a specific set of computations to construct that model. At that point, ‘I am aware of X’ entered their repertoire of possible computations.

Link to the article in Aeon Magazine

Michael Graziano is a professor of neuroscience at Princeton University. His latest book, Consciousness and the Social Brain, is scheduled for release in September.

Friday, July 26, 2013

Frank Wilczek's paper on the prsopect of a multiverse: "Multiversality"






Valid ideas that physical reality is vastly larger than human perception of it, and that the perceived part may not be representative of the whole, exist on many levels and have a long history. After a brief general inventory of those ideas and their implications, I consider the cosmological “multiverse” much discussed in recent scientific literature. I review its theoretical and (broadly) empirical motivations, and its disruptive implications for the traditional program of fundamental physics. I discuss the inflationary axion cosmology, which provides an example where firmly rooted, plausible ideas from microphysics lead to a well-characterized “mini-multiverse” scenario, with testable phenomenological consequences

Swirls in the Afterglow of the Big Bang Could Set Stage for Major Discovery






From Science Now:

Scientists have spotted swirling patterns in the radiation lingering from the big bang, the so-called cosmic microwave background (CMB). The observation itself isn't Earth-shaking, as researchers know that these particular swirls or "B-modes" originated in conventional astrophysics, but the result suggests that scientists are closing in on a much bigger prize: B-modes spawned by gravity waves that rippled through the infant universe. That observation would give them a direct peek into the cosmos' first fraction of a second and possibly shed light on how it all began.

Friday, June 21, 2013

A New Equation Reveals Our Exact Odds of Finding Alien Life





...well, not exactly.  But the new equation, the Seager Equation, hopes to estimate the number of worlds we can hope to find in the near future with detectible biosignature gases.  This isn't a search for intelligent life, but instead a search for any type of life that is somewhat similar to our own.

According to Seager's estimate, we should be able to detect a few planets with biosignatures, indicating they are inhabited by some form of life, within the next decade or so.

The Seager Equation

   http://img.gawkerassets.com/img/18ripzjli2hxxjpg/ku-xlarge.jpg

Tuesday, June 18, 2013

A theory of everything ... has physics gone too far?


Jim Baggott and Mike Duff debate the limits of physics

I agree with Duff.  While observation and confirmation of theory will always be fundamental to the process of real science, the fact that we can not directly observe something in the present does not invalidate a theory that is developed through scientific analysis.

As Duff explains:

 Similarly, string theorists did not assume supersymmetry, extra dimensions, the dualities of M-theory or the myriad possible universes; they discovered them to be consequences of a theory that subsumes empirically well-established features such as general relativity, gauge field theory and chiral quarks and leptons. Current research is devoted to finding out what else M-theory requires.  Moreover, there is a feeling, hard to convey to the layman but shared by many experienced theorists, that these ideas all hang together. As Peter Higgs said recently, "I'm a big fan of supersymmetry because it seems the only way to get gravity into the game''.
Finally, you offer no credible alternative. If you don't like string theory the answer is simple: come up with a better one. The battle for the correct theory will not be won on Amazon or on the blogosphere, however. It will be won in the pages of scholarly scientific journals. Sadly, many critics of string theory, having lost their case in the court of science, try to win it in the court of popular opinion. A science writer calling the theorists who are actually doing the research "confidence tricksters'' or Stephen Hawking "a fairytale physicist'' doesn't cut the mustard.
 

Tuesday, June 4, 2013

New Physics Complications Lend Support to Multiverse Hypothesis



Is Nature Unnatural? by Natalie Wolchover 

 With the discovery of only one particle, the LHC experiments deepened a profound problem in physics that had been brewing for decades. Modern equations seem to capture reality with breathtaking accuracy, correctly predicting the values of many constants of nature and the existence of particles like the Higgs. Yet a few constants — including the mass of the Higgs boson — are exponentially different from what these trusted laws indicate they should be, in ways that would rule out any chance of life, unless the universe is shaped by inexplicable fine-tunings and cancellations.

Eric Weinstein may have found the answer to physics' biggest problems

"A physicist has formulated a mathematical theory that purports to explain why the universe works the way it does – and it feels like 'the answer'"

LINK to article in The Guardian

The Guardian article was written by mathematician Marcus du Sautoy, who is a supporter of Weinstein's theory which has been dubbed Geometric Unity.  However, most scientists remain skeptical, and Weinstein's equations have not been submitted for review yet, as discussed in this New Scientist article.