Posts

January 31, 2015

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8:02 PM | New theory tries to define where black holes don’t exist
The quintessential feature of a black hole is its “point of no return,” or what is more technically called its event horizon, yes just like the movie. When anything—a star, a particle, or wayward human—crosses this horizon, the black hole’s massive gravity pulls it in with such force that it is impossible to escape. At […]

Ali, A., Faizal, M. & Majumder, B. (2015). Absence of an effective Horizon for black holes in Gravity's Rainbow, EPL (Europhysics Letters), 109 (2) 20001. DOI: 10.1209/0295-5075/109/20001

Amelino-Camelia, G (2002). Relativity in space-times with short-distance structure governed by an observer-independent (Planckian) length scale, International Journal of Modern Physics D, 11 (01) 35-59. DOI: 10.1142/S0218271802001330

Freidel, L. & Livine, E. (2006). 3D Quantum Gravity and Effective Noncommutative Quantum Field Theory, Physical Review Letters, 96 (22) DOI: 10.1103/PhysRevLett.96.221301

Citation
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8:02 PM | New theory tries to define where black holes don’t exist
The quintessential feature of a black hole is its “point of no return,” or what is more technically called its event horizon, yes just like the movie. When anything—a star, a particle, or wayward human—crosses this horizon, the black hole’s massive gravity pulls it in with such force that it is impossible to escape. At […]

Ali, A., Faizal, M. & Majumder, B. (2015). Absence of an effective Horizon for black holes in Gravity's Rainbow, EPL (Europhysics Letters), 109 (2) 20001. DOI: 10.1209/0295-5075/109/20001

Amelino-Camelia, G (2002). Relativity in space-times with short-distance structure governed by an observer-independent (Planckian) length scale, International Journal of Modern Physics D, 11 (01) 35-59. DOI: 10.1142/S0218271802001330

Freidel, L. & Livine, E. (2006). 3D Quantum Gravity and Effective Noncommutative Quantum Field Theory, Physical Review Letters, 96 (22) DOI: 10.1103/PhysRevLett.96.221301

Citation
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8:02 PM | New theory tries to define where black holes don’t exist
The quintessential feature of a black hole is its “point of no return,” or what is more technically called its event horizon, yes just like the movie. When anything—a star, a particle, or wayward human—crosses this horizon, the black hole’s massive gravity pulls it in with such force that it is impossible to escape. At […]

Ali, A., Faizal, M. & Majumder, B. (2015). Absence of an effective Horizon for black holes in Gravity's Rainbow, EPL (Europhysics Letters), 109 (2) 20001. DOI: 10.1209/0295-5075/109/20001

Amelino-Camelia, G (2002). Relativity in space-times with short-distance structure governed by an observer-independent (Planckian) length scale, International Journal of Modern Physics D, 11 (01) 35-59. DOI: 10.1142/S0218271802001330

Freidel, L. & Livine, E. (2006). 3D Quantum Gravity and Effective Noncommutative Quantum Field Theory, Physical Review Letters, 96 (22) DOI: 10.1103/PhysRevLett.96.221301

Citation
+
8:02 PM | New theory tries to define where black holes don’t exist
The quintessential feature of a black hole is its “point of no return,” or what is more technically called its event horizon, yes just like the movie. When anything—a star, a particle, or wayward human—crosses this horizon, the black hole’s massive gravity pulls it in with such force that it is impossible to escape. At […]

Ali, A., Faizal, M. & Majumder, B. (2015). Absence of an effective Horizon for black holes in Gravity's Rainbow, EPL (Europhysics Letters), 109 (2) 20001. DOI: 10.1209/0295-5075/109/20001

Amelino-Camelia, G (2002). Relativity in space-times with short-distance structure governed by an observer-independent (Planckian) length scale, International Journal of Modern Physics D, 11 (01) 35-59. DOI: 10.1142/S0218271802001330

Freidel, L. & Livine, E. (2006). 3D Quantum Gravity and Effective Noncommutative Quantum Field Theory, Physical Review Letters, 96 (22) DOI: 10.1103/PhysRevLett.96.221301

Citation
+
8:02 PM | New theory tries to define where black holes don’t exist
The quintessential feature of a black hole is its “point of no return,” or what is more technically called its event horizon, yes just like the movie. When anything—a star, a particle, or wayward human—crosses this horizon, the black hole’s massive gravity pulls it in with such force that it is impossible to escape. At […]

Ali, A., Faizal, M. & Majumder, B. (2015). Absence of an effective Horizon for black holes in Gravity's Rainbow, EPL (Europhysics Letters), 109 (2) 20001. DOI: 10.1209/0295-5075/109/20001

Amelino-Camelia, G (2002). Relativity in space-times with short-distance structure governed by an observer-independent (Planckian) length scale, International Journal of Modern Physics D, 11 (01) 35-59. DOI: 10.1142/S0218271802001330

Freidel, L. & Livine, E. (2006). 3D Quantum Gravity and Effective Noncommutative Quantum Field Theory, Physical Review Letters, 96 (22) DOI: 10.1103/PhysRevLett.96.221301

Citation
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3:12 PM | Morsels For The Mind – 30/01/2015
Every day we provide you with Six Incredible Things Before Breakfast to nibble away at. Here you can fill your brain with the most intellectually stimulating “amuse bouches” from the past week – a veritable smorgasbord for the cranium. They’re all here for you to load up your plate – this week’s “Morsels for the mind”. Enjoy! If you do nothing else, make sure to check out the “Reads / views / listens of the week”. **** Feather, fur […]
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3:12 PM | Morsels For The Mind – 30/01/2015
Every day we provide you with Six Incredible Things Before Breakfast to nibble away at. Here you can fill your brain with the most intellectually stimulating “amuse bouches” from the past week – a veritable smorgasbord for the cranium. They’re all here for you to load up your plate – this week’s “Morsels for the mind”. Enjoy! If you do nothing else, make sure to check out the “Reads / views / listens of the week”. **** Feather, fur […]
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12:07 PM | Accelerating Frames: Cosmology Homework
Our cosmology course is well under way and it's  a lot of fun so far!  The class direction overall is towards describing the inflationary universe by means of quantum field theory, but this week we're focused on relativity.  We're allowed to work on our homework together, however, I'm spending most of my time in the lab this semester, so I'll be posting my homework notes here.  If you'd like to grab bits and pieces, make suggestions, or contribute, the whole shooting match […]
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10:18 AM | Physics Week in Review: January 31, 2015
The Super Bowl is tomorrow, which means people were still obsessing over the so-called “DeflateGate” controversy stemming from the Patriots’ win over the Colts. This week, the... -- Read more on ScientificAmerican.com

January 30, 2015

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11:26 PM | Ask Ethan #73: The Multiverse and you (Synopsis)
“Go then, there are other worlds than these.” -Stephen King, The Dark Tower Ever since quantum mechanics first came along, we’ve recognized how tenuous our perception of reality is, and how — in many ways — what we perceive is just a very small subset of what’s going on at the quantum level in our…
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8:55 PM | How Small Is An Atom? Spoiler: Very Small. Atoms are very weird....
How Small Is An Atom? Spoiler: Very Small. Atoms are very weird. Wrapping your head around exactly how weird, is close to impossible – how can you describe something that is SO removed from humans experience? But then again, they kind of make up everything, so let us try anyways. By: Kurzgesagt - In a Nutshell. Support on Patreon: http://www.patreon.com/Kurzgesagt
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7:00 PM | Playing with Legos at Work!
Categories: ScienceTags: ATLAScernHigh Energy PhysicsLEGOphysicsScienceOver the last few weeks we’ve been spending a lot of time here at the University of Oslo putting together a Lego model of the ATLAS detector. The ATLAS detector ...(Read more...)
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6:46 PM | BICEP2 Gravitational Wave 'Discovery' Deflates
Physicists have announced that last year's much-publicized 'discovery' of gravitational waves embedded in the 'echo' of the Big Bang was a misstep.
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5:11 PM | The ATLAS Top Production Asymmetry And One Thing I Do Not Like Of It
ATLAS sent today to the Cornell arxiv and to the journal JHEP their latest measurement of the top-antitop production asymmetry, and having five free minutes this afternoon I gave a look at the paper, as the measurement is of some interest. The analysis is done generally quite well, but I found out there is one things I do not particularly like in it... It does not affect the result in this case, but the used procedure is error-prone. But let's go in order. First I owe you a quick-and-dirty […]
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4:44 PM | Physicists Create Möbius Strips out of Light
An international team of physicists, led by Dr Thomas Bauer from the Max Planck Institute for the Science of Light and the Friedrich-Alexander-University Erlangen-Nuremberg in Germany, has experimentally produced a three-dimensional geometrical structure called Möbius strip from the polarization of light. Light is an electromagnetic wave, and as such it has an electromagnetic field. The [...]
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4:31 PM | The right road to scientific revolution
Change in science is very hard. If you want to make your mark as a scientist, you have to achieve a very careful balance. Your results must be new, but consistent with other established science. Truly revolutionary discoveries — both experimental and theoretical — are very rare, often only recognized as revolutionary over time. Then […]
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4:13 PM | A magnet falling in a metal tube
by @ulaulaman http://youtu.be/keMpUaoA3Tg about #magnet #school #physics #experiments #magnetic_field Sometimes teach physics, and a couple of years ago the colleague of the educational laboratory proposed to the students a simple experiment: a magnet that descends along a metal tube(1) does not fall at the same speed of the same magnet that we throw from the same height, for example, inside a not metal tube. The magnet inside the metal tube will drop almost as if it remained in suspension, […]
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2:06 PM | Super Bowl Athletes Are Scientists At Work
I wrote up another piece about football for the Conversation, this time drawing on material from Eureka, explaining how great football players are using scientific thinking: Seattle Seahawks cornerback Richard Sherman gets called a lot of things. He calls himself the greatest cornerback in the NFL (and Seattle fans tend to agree). Sportswriters and some…
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10:45 AM | An Odd Hypothesis About Bubbles Could Finally Lead to Nuclear Fusion
Nuclear fusion is the dream of energy scientists the world over, because it promises limitless, clean electricity. Most efforts to kickstart the process use high-intensity lasers, insane magnetic field and super-hot hydrogen plasmas. But there may be a more humble alternative. It's called sonofusion, and it involves bubbles.Read more...
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9:33 AM | $mart
(yay! internet finally restored!) Why 50 million smart meters still haven’t fixed America’s energy habits The upshot: Right now, smart meters aren’t waking Americans up and making them conscious of their energy use — because they aren’t being paired with what behavioral research shows us is needed for that to happen. This is the story [...]
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3:40 AM | Quantum Superpositions: let there be light
Ideal Negative Measurements in Quantum Walks Disprove Theories Based on Classical Trajectories Reported as: Atoms can be in two places at the same time Excerpt: “This is not yet a proof that quantum mechanics hold for large objects,” cautions Alberti....Read more
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1:09 AM | Stacked Ball Drop What happens when you drop a perfectly...
Stacked Ball Drop What happens when you drop a perfectly balanced stack of balls? And how is the result like a supernova? The classic momentum transfer demonstration, at the next level. By: Physics Girl.

January 29, 2015

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11:24 PM | Charles Hard Townes, 1915-2015
Yesterday I awoke to the news that Charles Hard Townes, a 1964 Nobel laureate for fundamental work on maser and laser physics, had died on Tuesday, January 27. In six months and a day, he would have turned 100 years old, but you can still think of this as his centennial year, in my opinion. […]
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11:20 PM | Collision avoidance predicts pedestrians’ behavior
A simple rule for a range of crowd behavior.
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2:58 PM | The Problem with (and Promise of) Word Problems
Math with Bad Drawings has a post about “word problems” that will sound very familiar to anyone who’s taught introductory physics. As he notes, the problem with “word problems” for math-phobic students is that it requires translating words into symbols, and then using the symbols to select a procedure. It adds a step to what…
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3:00 AM | How Did Edgar Allan Poe Manage To Describe The Big Bang In 1848?
They mocked when Edgar Allan Poe published his prose poem "Eureka" in his last year of life, describing how the universe had begun with a single "primordial particle" that exploded outwards in "one instantaneous flash." But 80 years later, cosmologists started realizing that Poe had been on to something.Read more...

January 28, 2015

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8:56 PM | Neil deGrasse Tyson Explains Modified Newtonian Dynamics A fan...
Neil deGrasse Tyson Explains Modified Newtonian Dynamics A fan asks if Modified Newtonian Dynamics, a theory that attempts to explain the missing mass in the Universe without resorting to the existence of dark matter, is credible, or is it pseudoscience? To answer this Cosmic Query, Neil deGrasse Tyson explains MOND, as astrophysicists call it, to co-host Chuck Nice, touching on dark matter, dark gravity, and Newton’s Laws. But is it pseudoscience? No spoilers here: watch and learn for […]
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8:30 PM | How "Second Sound" Helps the Large Hadron Collider Work
Superfluids have many extraordinary properties. One of them is called "second sound" even though it doesn't have anything to do with sound waves. It does have something to do with making the Large Hadron Collider work, though. Find out why.Read more...
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8:08 PM | Why, Exactly, Does The Sun Turn Green?
Under the right conditions, the upper edge of the setting sun will blaze bright green just before dipping below the horizon. What causes these "green flashes"? The answer is more complicated than you probably realize.Read more...
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6:30 PM | Charles Townes, One Of The Fathers Of The Laser, Dies
Townes' science achievements are evident from how frequently he shows up Popular Science's archives.
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