The hammock physicist

Johannes Koelman

Johannes Koelman

I am a Dutchman, currently living in India. Following a PhD in theoretical physics (spin-polarized quantum systems*) I entered a Global Fortune 500 company where I am currently Chief Scientist. In my blogs here you won't read about my professional w…
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All From Zilch: Much Ado About Nothing

All From Zilch: Much Ado About Nothing

Bantam Books must be happy. Prior to going on sale, Stephen Hawking's* new book 'The Grand Design' has attracted considerable media attention. (See for instance: CNN, BBC, Yahoo, Telegraph, and LA Times.)What's this fuzz all about? 

A Special Guest Post: Quantum Hexodynamics

A Special Guest Post: Quantum Hexodynamics

A Special Guest Post by Richard ("Dick") Flatman

"I call our world Flatland,not because we call it so, but to make its nature clearer to you, my happy readers, who are privileged to live in Space."

This is how my great-grandfather started his memoirs. Memoirs he wrote in solitary confinement. Years later he died, imprisoned and alone, and not aware that his ideas were already starting to change not only the views and imagination of us Flatlanders, but also the perspectives of you Spacelanders. 
 
How time has progressed! My great-grandfather is now considered a hero of science. A visionary thinker who has shown us Flatlanders the route towards scientific enlightenment. An unstoppable growth of science got built upon his legacy.

What's Wrong With Dark Energy?

What's Wrong With Dark Energy?

A young fisherman in a distant past looks across the sea and ponders: "What an unimaginably big stretch of water!" He has no idea where it ends or even if it ends. But he knows one thing: over time spans of many years the rainfall into the sea adds up to a lot of water, and therefore the sea must be rising. This means that in a number of generations the sea will inevitably flood the lands, making the world an inhabitable place. But it also means that in the past the sea must have been much shallower. Too shallow for fish to thrive in. An inevitable conclusion forces itself upon our young fisherman. His generation is a very privileged one. A generation that lives late enough to find fish to feed on, and early enough to find land to live on. A remarkable coincidence.

It From Bit - The Whole Shebang

It From Bit - The Whole Shebang

In the It-From-Bit series I have reported extensively on Verlinde's 'entropic gravity' concept. I have also provided you with an illustrative 'mikado universe' picture of entropic gravity. This got topped off with my own intuitive notion that in an entropic universe, not only gravity, but also accelerated cosmic expansion emerges. As a result, in one fell swoop, entropy eliminates the need for a fundamental force of gravity as well as the need for dark energy. 

How To Count A Black Hole

How To Count A Black Hole

Imagine you are tasked to build the ultimate computer memory. You are provided with an unlimited budget and all the resources you need. How big a memory capacity could you build? 

Metric Vs Imperial: End Of An Epic Battle?

Metric Vs Imperial: End Of An Epic Battle?

Which country does not belong in the following list: Burma, Liberia, Somalia, United States?OK, that was not too difficult. As astute Scientific Blogging reader you got that right. Somalia has made the step to metric (SI) units already half a century ago, and therefore does not belong in one list together with the three remaining countries that haven't embraced the metric system yet. 

Post-Imperial Metric

Post-Imperial Metric

Metric mania

Which country does not belong in the following list: Burma, Liberia, Somalia, United States?

OK, that was not too difficult. As astute Scientific Blogging reader you got that right. Somalia has made the step to metric (SI) units already half a century ago, and therefore does not belong in one list together with the three sole remaining countries that haven't embraced the metric system yet. 

LOFAR: A New Era In Radio Astronomy

LOFAR: A New Era In Radio Astronomy

With the press of a button, yesterday Queen Beatrix of the Netherlands activated LOFAR and started the recording of its first official image. LOFAR (LOw Frequency ARray) is by all standards a big radio telescope. Centered in the North East of the Netherlands, it stretches far over the Dutch borders into Northwest Europe. LOFAR location spread across Europe

You're So Predictable!

You're So Predictable!

Rock-paper-scissors, RPS. Who hasn't played it as a child? The game, known by a variety of names such as Rochambeau, Jan-ken and Kauw-bauwi-bo, is played all over the world. The rules are straightforward, and can be explained to a five-year old:Both players simultaneously make one of three gestures representing rock (clenched fist), paper (open hand) or scissors (index and middle finger apart). Rock gets beaten (wrapped) by paper, paper gets cut by scissors, and scissors get smashed by rock. Identical gestures create a tie. The objective is to select a gesture that beats that of the opponent.

You, Retaliator!

You, Retaliator!

The safe deposit in front of you is wide open. Twenty stacks of one-hundred dollar bills stare you in the face. Each stack a hundred bills thick. So many Benjamins. All for Jude, the other remaining contestant. That is... provided you don't touch the money. You prepared yourself a zillion times. Still it feels like you are placed in an entirely new situation, a nightmare you never considered.

Hubble's 20th: A Taxpayer's Perspective

Hubble's 20th: A Taxpayer's Perspective

Hip, hip, hooray. The Hubble has reached its twentieth anniversary* and is  still alive and kicking. Congratulations go to NASA and ESA. And to the Hubble itself. Long live the Hubble!Chances are, that by now you will be able to read more than a few blogs hailing the two decades of the Hubble as mankind's supreme window to the universe. And indeed, the Hubble has provided us with some spectacular pictures of the universe.