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Gerhard Zauner
Natura semina nobis scientiae dedit, scientiam non dedit. (Seneca)
Natura semina nobis scientiae dedit, scientiam non dedit. (Seneca)

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For all physicists: this is a very well structured and done presentation by +Ivette Fuentes - about an interesting aspect in combining quantum theory with general relativity. View this video and enjoy it!
Video of yesterdays hangout now available Q+ hangout: Ivette Fuentes

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Nicolaus Copernicus, who's 540th birthday we celebrate today, was born in the city of Toruń in north-western Poland.

He spent most of his life (1512–16 and 1522–43) and wrote his epochal work, De revolutionibus orbium cœlestium in the very, very small town of Frombork (German: Frauenburg) at the Polish coast of the Baltic Sea, now close to the border to Russia (Kaliningrad Oblast).

I made the pictures below 12 years ago from the walls around the cathedral where Copernicus worked as a canon.
4 Photos - View album

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Today, 441 years ago, on December 27, 1571, Johannes Kepler - best known for his 3 laws of planetary motion - was born in a small town near Stuttgart.
He spent most of his adult life in Austria, in Graz (1594–1600) and Linz (1612–1627). In between he lived in Prague, were he shortly worked for and learned from the excellent astronomical observations of Tycho Brahe.  
Based on the life and work of Johannes Kepler Philip Glass composed an opera, that premiered in 2009 in Linz.

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Today 209 years ago, on 29 November 1803 the mathematician and physicist Christian Andreas Doppler was born in Salzburg, Austria. He was the first to propose what is now called the Doppler effect, the change in frequency of a wave, when the observer and the source are moving relative to each other.

Since 1988 the so called Christian Doppler Gesellschaft (CDG) is active in Austria with 550 employees in 62 labratories, doing applied research in co-operation with 140 Austrian and international companies.

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Hermann Weyl, Group Theory ... and beyond?

Today, Nov 9, is the 127th birthday anniversary of the German mathematician and theoretical physicist Hermann Klaus Hugo Weyl. Among many other things he significantly contributed to the theory of compact groups, in terms of matrix representations. Ever since his influentual book Gruppentheorie und Quantenmechanik from 1928, group representation theory is closely connected, even a guideline for new developments in quantum theory.

But this is probably not the last word. As e.g. Benjamin F. Dribus wrote in his essay On the Foundational Assumptions of Modern Physics submitted to this years FQXI essay contest: Group representation theory lies at the heart of modern physics as the mathematical expression of symmetry, and remains perhaps the most likely vehicle for initial, verifiable progress beyond the standard model; however, analogous constructs from order theory, and perhaps other notions more primitive than groups, will likely partially replace representation theory over the long term.

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New central railway station in Vienna (Austria) - under construction.

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A nice autumn day in the south-east of Austria (near Bad Tatzmannsdorf).

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Slow down!

11 years ago on in this day a unique performance of Organ²/ASLSP (As SLow aS Possible) by John Cage started in the medivial St. Burchardi church in Halberstadt, Germany. It is scheduled to have a duration of 639 years, ending in 2640.

Today is the 100th birthay anniversary of the influential American composer,
music theorist, writer, and artist John Cage.

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The archaeological site of Delphi is located on multiple terraces along the slope of Mount Parnassus in lower central Greece. In Greek mythology it was the site of the Delphic oracle, the most important oracle in the classical Greek world, and a major site for the worship of the god Apollo.
The pictures below (which I have made 12 years ago) are especially for  +Susanne Ramharter as unfortunately her visit to Delphi was on a very rainy day.
Delphi (5 Fotos)
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