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Physics: What We Do and Don’t Know. By Steven Weinberg

Physics: What We Do and Don’t Know. By Steven Weinberg | omnia mea mecum fero | Scoop.it

In the past fifty years two large branches of physical science have each made a historic transition. I recall both cosmology and elementary particle physics in the early 1960s as cacophonies of competing conjectures. By now in each case we have a widely accepted theory, known as a “standard model.”

 

Cosmology and elementary particle physics span a range from the largest to the smallest distances about which we have any reliable knowledge. The cosmologist looks out to a cosmic horizon, the farthest distance light could have traveled since the universe became transparent to light over ten billion years ago, while the elementary particle physicist explores distances much smaller than an atomic nucleus. Yet our standard models really work—they allow us to make numerical predictions of high precision, which turn out to agree with observation.

Up to a point the stories of cosmology and particle physics can be told separately. In the end, though, they will come together.

 


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BHinstitute Harendran B's curator insight, October 21, 2013 1:54 AM
Amazing science is best knowledge updated..
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Spinning Match - Table Trick at Steve Spangler Science

Spinning Match - Table Trick at Steve Spangler Science | omnia mea mecum fero | Scoop.it
Spinning Match - Table Trick - When you cautiously balance a matchstick on the rim of a coin that has also been precariously balanced onto another coin, it might sound like rotating the matchstick will cause it all to come tumbling down.

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[VIDEO] Michio Kaku: The Universe in a Nutshell

What if we could find one single equation that explains every force in the universe? Dr. Michio Kaku explores how physicists may shrink the science of the Big Bang into an equation as small as Einstein's "e=mc^2." Thanks to advances in string theory, physics may allow us to escape the heat death of the universe, explore the multiverse, and unlock the secrets of existence. While firing up our imaginations about the future, Kaku also presents a succinct history of physics and makes a compelling case for why physics is the key to pretty much everything.


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[VIDEO] The Higgs Boson, Part I

The Higgs Boson. What more need be said? Two more Higgs videos coming soon.


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Physicists say they've found evidence of 'God particle'

Physicists say they've found evidence of 'God particle' | omnia mea mecum fero | Scoop.it
To cheers and standing ovations from scientists, the world's biggest atom smasher claimed the discovery of a new subatomic particle Wednesday, calling it "consistent" with the long-sought Higgs boson -- popularly known as the "God particle" -- that...

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Scientists edge closer to proving existence of elusive Higgs boson particle - CNN.com

Scientists edge closer to proving existence of elusive Higgs boson particle - CNN.com | omnia mea mecum fero | Scoop.it
Scientists in Illinois said they had crept closer to proving that the Higgs boson exists but had been unable to reach a definitive conclusion.

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How black holes change gear

How black holes change gear | omnia mea mecum fero | Scoop.it

Black holes are extremely powerful and efficient engines that not only swallow up matter, but also return a lot of energy to the Universe in exchange for the mass they eat.


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[VIDEO] Every Force in Nature (Theory of Everything, Part III)

In which we explain economic equilibrium, how to make money from nothing, and every fundamental force in physics.


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[VIDEO] TEDxNCSSM-Arlie Petters-Is There a Fifth Dimension?

Petters' research is focused on the development of mathematical theory of gravitational lensing. He is the leading author of the book, /Singularity Theory and Gravitational Lensing/.


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[VIDEO] Gravity - From Newton to Einstein - The Elegant Universe

From the NOVA PBS series "THE ELEGANT UNIVERSE', host Brian Greene guides us through Newton's discovery of gravity to the explanation of it, through Einsteins Theory of Relativity.

 

Articles about ASTRONOMY: http://www.scoop.it/t/science-news?tag=astronomy

 


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Magnetic fields can send particles to infinity

Magnetic fields can send particles to infinity | omnia mea mecum fero | Scoop.it
Researchers from the Complutense University of Madrid (UCM, Spain) have mathematically shown that particles charged in a magnetic field can escape into infinity without ever stopping.

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Breakthrough in Quantum Communication

Breakthrough in Quantum Communication | omnia mea mecum fero | Scoop.it

A team of scientists at the MPQ realizes a first elementary quantum network based on interfaces between single atoms and photons...


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anjoyplanet's comment, April 14, 2012 6:35 AM
Fantastic !!!
In the same time , this news :
http://www.sciencenewsline.com/physics/2012040519440010.html
Similar ?
Sakis Koukouvis's comment, April 14, 2012 9:39 AM
Yes, it is the same news. Very important experiment
anjoyplanet's comment, April 14, 2012 1:17 PM
YES !!! The love story between ATOM ans PHOTON is begining...
Another link :
http://www.nature.com/nature/journal/v484/n7393/full/nature11023.html
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[VIDEO] Animation: Just How Small is an Atom?

Just how small are atoms? And what's inside them? The answers turn out to be astounding, even for those who think they know. This fast-paced animation uses spectacular metaphors (imagine a blueberry the size of a football stadium!) to give a visceral sense of the building blocks that make our world. Lesson by Jonathan Bergmann, animation by Cognitive Media.


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What Is Time? Theoretical Physicist Sean Carroll Explains Time's Arrow

Have you ever stopped to ask yourself, "what is time?" We all understand its passage intuitively, experientially. But does time actually exist? Is it a force of nature? A tangible entity? I spoke with theoretical physicist and perhaps the world's premier expert on the science of time, Sean Carroll, to learn more.


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Dr. Kaku's Must-See Videos

Dr. Kaku's Must-See Videos | omnia mea mecum fero | Scoop.it
Dr. Michio Kaku gives us a tour of some of the best science videos on the web, from Carl Sagan to CERN.

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For the First Time, A Snapshot of A Single Atom's Shadow

For the First Time, A Snapshot of A Single Atom's Shadow | omnia mea mecum fero | Scoop.it

There's no way to take a direct picture of something as small and fleeting as a Higgs boson. But physicists can photograph its relatives, directly imaging atomic structures and improving our understanding of atomic physics. Now comes this picture: The first-ever snapshot of a single atom's shadow.


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The Higgs Boson and Its Discovery Explained with Animation

The Higgs Boson and Its Discovery Explained with Animation | omnia mea mecum fero | Scoop.it
Ever since the Large Hadron Collider (LHC) went online in 2008, physicists have been conducting experiments, hoping to finally prove or disprove the existence of The God Particle, otherwise known as the Higgs Boson.

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Science fiction, science fact: Does infinity exist?

Science fiction, science fact: Does infinity exist? | omnia mea mecum fero | Scoop.it

Submitted by mf344 on July 2, 2012

Does infinity exist? In the latest online poll of our Science fiction, science fact project you told us that you'd like an answer to this question. So we went to speak to cosmologist John D. Barrow to find out more. We also bring you a range of other Plus articles on the subject of infinity, as well as an article from FQXi who are our partners on this project. Happy reading!


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BBC series about time: Michio Kaku - Time, a physical reality?

Playlist: http://www.youtube.com/view_play_list?p=DDC8B9A17F8A88A4 In this four-part series, string theory pioneer Michio Kaku goes on an extraordinary explo...

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The Mystery of Empty Space

Get ready to re-think your ideas of reality. Join UCSD physicist Kim Griest as he takes you on a fascinating excursion, addressing some of the massive effort...

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[VIDEO] The Tesla Gun

A battery powered Tesla coil, in the shape of a rifle. Build details here: http://hackerfriendly.com/the-tesla-gun/ Sparks are quite tricky to film. There is...

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What are quarks, and why do they have colors and flavors?

What are quarks, and why do they have colors and flavors? | omnia mea mecum fero | Scoop.it
Quarks make up all matter, but have never been seen by themselves. And they have "flavors" and "colors" — though neither term has any relevance to what they actually do.

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[VIDEO] PHD Comics: The Higgs Boson Explained

[VIDEO] PHD Comics: The Higgs Boson Explained | omnia mea mecum fero | Scoop.it

Link to Piled Higher and Deeper...


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[VIDEO] How far is a second?

The moon may be 1.3 light-seconds away, but why on earth do we measure distances using time?


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Physicists continue work to abolish time as fourth dimension of space

Physicists continue work to abolish time as fourth dimension of space | omnia mea mecum fero | Scoop.it

In a new study, Sorli and Fiscaletti have shown that two phenomena of special relativity - time dilation and length contraction - can be better described within the framework of a 3D space with time as the quantity used to measure change (i.e., photon motion) in this space.


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