Tags: physics - entropy / & see entropy

* - moon around

Clock Work

The New Thermodynamic Understanding of Clocks (quantamagazine.org)

Studies of the simplest possible clocks have revealed their fundamental limitations -- as well as insights into the nature of time itself. Natalie Wolchover, writing for Quanta Magazine: [...] Over the past five years, through studies of the simplest conceivable clocks, the researchers have discovered the fundamental limits of timekeeping. They've mapped out new relationships between accuracy, information, complexity, energy and entropy -- the quantity whose incessant rise in the universe is closely associated with the arrow of time. These relationships were purely theoretical until this spring, when the experimental physicist Natalia Ares and her team at the University of Oxford reported measurements of a nanoscale clock that strongly support the new thermodynamic theory.

Nicole Yunger Halpern, a quantum thermodynamicist at Harvard University who was not involved in the recent clock work, called it "foundational." She thinks the findings could lead to the design of optimally efficient, autonomous quantum clocks for controlling operations in future quantum computers and nanorobots. The new perspective on clocks has already provided fresh fodder for discussions of time itself. "This line of work does grapple, in a fundamental way, with the role of time in quantum theory," Yunger Halpern said. Gerard Milburn, a quantum theorist at the University of Queensland in Australia who wrote a review paper last year about the research on clock thermodynamics, said, "I don't think people appreciate just how fundamental it is."

goth - wuthering oscar

Thermodynamic Asymmetry in Time

From Stanford Encyclopedia of Philosophy:

Thermodynamic Asymmetry in Time

The thermodynamic time asymmetry is one of the most salient and consequential features of the physical universe. Heat flows from hot to cold, never the reverse. The smell of coffee spreads throughout its available volume, never the reverse. Car engines convert fuel energy into work and thermal energy, never the reverse. And so on. The science of thermodynamics is able to capture these generalizations as consequences of its claim that systems spontaneously evolve to future equilibrium states but do not spontaneously evolve away from equilibrium states. This generalization covers an amazing amount of macroscopic physics and is rightly celebrated as one of the great laws of physics.

Despite its familiarity, however, the thermodynamic arrow of time raises many deep questions relevant to both philosophy and the foundations of physics. This entry concentrates on two of them. In contemporary parlance, they are each questions about grounding. (1) What grounds the thermodynamic asymmetry in time? In a world possibly governed at bottom by time-symmetric laws, how do the time-asymmetric laws of thermodynamics arise? (2) Does the thermodynamic time asymmetry ground any other temporal asymmetries? Does it account, for instance, for the fact that we know more about the past than the future? The discussion thus divides between thermodynamics being an explanandum or explanans. What grounds the thermodynamic asymmetry, and given the asymmetry, what does it ground?


Collapse )

Full Article HERE

(ME: Another bad day. However, relieved of need to go downtown to library, as I found that I could not cancel a check since it had already been sent out on Monday. Will be hot and humid here for a while, so I will spend a lot of time in AC'ed bedroom. That means gradually eliminating all my browser tabs so I can start up fresh and faster. Gradually more LJ comments. Possibly setting up WiFi. However, I need to go downtown anyway, not sure when, to do an Instacart order. All for now).
* - galaxy

Stephen Hawking's final scientific paper released

Stephen Hawking's final scientific paper released

Black Hole Entropy and Soft Hair was completed in the days before the physicist’s death in March

Black holes and soft hair: why Stephen Hawking’s final work is important

Stephen Hawking’s final scientific paper has been released by physicists who worked with the late cosmologist on his career-long effort to understand what happens to information when objects fall into black holes.

The work, which tackles what theoretical physicists call “the information paradox”, was completed in the days before Hawking’s death in March. It has now been written up by his colleagues at Cambridge and Harvard universities and posted online.

Continue reading...
pink floyd - dark side

Project 101: "The Crying of Lot 49"

Thomas Pynchon was the David Foster Wallace of the 1960's-1970's, (although he has been writing strong as of 2013).   He was a post-modernist, "thinking-man's hippie," I guess.  His sprawling masterpiece was, Gravity's Rainbow, (1973), which explored such realms as: preterition, paranoia, racism, colonialism, conspiracy, synchronicity, and entropy,[22][23] - (Wiki). His first book, "V," (1963) was an intricate, bohemian romp in search of an elusive dream image. Such a vain crusade is a kind of antipode to entropy and exhaustion, yes?

  • Investigations and digressions into the realms of human sexuality, psychology, sociology, mathematics, science, and technology recur throughout Pynchon's works. One of his earliest short stories, "Low-lands" (1960), features a meditation on Heisenberg's uncertainty principle as a metaphor for telling stories about one's own experiences. His next published work, "Entropy" (1960), introduced the concept [entropy] which was to become synonymous with Pynchon's name, (though Pynchon later admitted the "shallowness of [his] understanding" of the subject, and noted that choosing an abstract concept first and trying to construct a narrative around it was "a lousy way to go about writing a story"). - (Wiki)

Pynchon's second novel was, The Crying of Lot 49, (1966).   This was a slender booklet still sneaking around today, in used bookstores and garage sales.  Pynchon called it, "...a short story, but with gland trouble"[19]. - (Wiki) I read The Crying of Lot 49 way back in my developmental past, finding it to be a kind of social satire. But, I grew to be more and more interested in it as I found it to relate to one of my favourite concepts, entropy, (or the Second Law of Thermodynamics). I recommend that you see some of my other posts relating to entropy, by going to my tag, coincidentally named, entropy.  (There are other entropy-related tags to be found, including this one: economics - entropy).

Collapse )
b hat

SPEAKING OF EXTINCTION - 3: Life on Mars

This is yet the latest linky theme post; forgive my indulgence, all ya wee popes.  So.
Put on your Indiana Jones' hats and jump in!  Ecno evil ylno uoY.  Right?

Venus
HOT SPOT Venus, seen in this radar map from the Magellan spacecraft, might have once been habitable, new simulations suggest.

Venus once possibly habitable, study suggests


Collapse )

I feel SO ALIVE! I'm a MARTIAN!
cheers - sunshine rainbow

I never promised you a rock garden

The most important post you will ever ignore... [This is a personal post with an eye to letting it at least be viewed by folks over at so_very_doomed, and one or two of my own communities]...

Collapse ) That's what I always say.


Image of three red unidentified lights in triangular pattern and pale shaft of low, rainy fog that appeared right after loud boom at approximately 8 PM on April 14, 2013, southwest of San Diego in the City of Imperial Beach, California.