pw201 + physics   41

black holes - Why is information indestructible? - Physics Stack Exchange
Top answer has a nice model using coloured squares and cellular automata rules.
physics  black-holes  universe  entropy 
january 2018 by pw201
What I learned as a hired consultant to autodidact physicists | Aeon Ideas
"A typical problem is that, in the absence of equations, they project literal meanings onto words such as ‘grains’ of space-time or particles ‘popping’ in and out of existence. Science writers should be more careful to point out when we are using metaphors. My clients read way too much into pictures, measuring every angle, scrutinising every colour, counting every dash. Illustrators should be more careful to point out what is relevant information and what is artistic freedom. But the most important lesson I’ve learned is that journalists are so successful at making physics seem not so complicated that many readers come away with the impression that they can easily do it themselves. How can we blame them for not knowing what it takes if we never tell them?"
science  physics  culture  pseudoscience 
august 2016 by pw201
Surprises of the Faraday Cage
Something Feynman got wrong, apparently (and which was repeated in the electro-magnetism lectures at university, as I recall).
physics  science  feynman  electromagnetism 
august 2016 by pw201
Physics - Arrow of Time Emerges in a Gravitational System
"Standard approaches to the arrow of time typically require a rare statistical fluctuation, or, often, the smuggling in of assumptions about initial conditions. Their work offers evidence that ordinary gravitational dynamics may itself be enough to produce the simple “initial” point that can give time a direction."
entropy  time  physics  gravity 
december 2014 by pw201
Our quantum reality problem – Adrian Kent – Aeon
An article about quantum theory and the philosophy of science.
physics  quantum  research  philosophy  science  everrett 
february 2014 by pw201
The science and magic of Lindy Hop | Andy Connelly | Science | theguardian.com
"Great partner dancers may not know it but they are masters of space, time and Newton's laws of motion." Of course we know it: for example, I've decided my "dance name" is "The Oncoming Storm". (I also suspect I know who the Alistair credited at the end is, as he's a Cambridge person).
lindy  physics  dancing  lindyhop  guardian  newton  mechanics 
december 2013 by pw201
Putting Time In Perspective
Nice little timelines zooming out from the day to human history to evolutionary history to the history of the Universe.
time  physics  universe  evolution 
september 2013 by pw201
Let the Universe Be the Universe | Cosmic Variance | Discover Magazine
Sean Caroll got mentioned in Craig's podcast, and responds: "The moment of the Big Bang is, if anything is, a place where quantum gravity is supremely important. The Borde-Guth-Vilenkin results are simply not about quantum gravity." "But when we’re not experts, it’s not intellectually honest to distort the words of experts to make them sound like they fit our pre-conceived narrative. That’s why engagement with people like Craig is fundamentally less interesting than engagement with open-minded people who are willing to take what the universe has to offer, rather than forcing it into their favorite boxes."
inflation  william-lane-craig  big-bang  cosmology  religion  god  physics  sean-carroll 
september 2012 by pw201
Optical Effects of Special Relativity - YouTube
What the world would look like if you went very fast (or lowered the speed of light).
physics  relativity  simulation  animation  video  youtube  science 
october 2011 by pw201
Eliezer Yudkowsky offers odds of 99 to 1 against faster than light information propagation
"I'll take bets at 99-to-1 odds against any information propagating faster than c... I will not accept more than $20,000 total of such bets." Yudkowsky taking that xkcd cartoon literally.
physics  eliezer-yudkowsky  light  ftl  neutrino  cern 
october 2011 by pw201
CPBD 089: John Shook – Dewey, Quine, and Some Varieties of Naturalism
John Shook talks to Luke Muehlhauser about philosophical naturalism (with a transcript, for those of you who hate podcasts). Interesting to find about the various naturalistic philosophies, and to see the responses to the supernaturalist "you naturalists think everything is just atoms" argument.
philosophy  naturalism  science  physics  materialism 
september 2011 by pw201
Sean Carroll: Does the Universe Need God?
Top theoretical cosmologist Sean Carroll wrote a chapter for the Blackwell Companion to Science and Christianity, and this is it. Interesting to compare Carroll's stuff with other popular science about the Big Bang.
philosophy  god  science  bigbang  big-bang  sean-carroll  physics  cosmology 
march 2011 by pw201
Fukushima is a triumph for nuke power: Build more reactors now! • The Register
"Japan's nuclear powerplants have performed magnificently in the face of a disaster hugely greater than they were designed to withstand, remaining entirely safe throughout and sustaining only minor damage. The unfolding Fukushima story has enormously strengthened the case for advanced nations – including Japan – to build more nuclear powerplants, in the knowledge that no imaginable disaster can result in serious problems."
science  nuclear  safety  physics  japan  earthquake 
march 2011 by pw201
YouTube - Top 10 quirky science tricks for parties
I like the one about pouring CO2 onto candles to extinguish them.
science  youtube  magic  video  tricks  physics  chemistry 
july 2010 by pw201
The Turn - 93.12
"At the very heart of winged flight lies the banked turn, a procedure that by now seems so routine and familiar that airline passengers appreciate neither its elegance and mystery nor its dangerously delusive character. The author, a pilot, takes us up into the subject"
flight  history  aviation  flying  banking  physics 
july 2010 by pw201
Dark power: Grand designs for interstellar travel - space - 25 November 2009 - New Scientist
Bussard Ramjets collecting dark matter, and tiny black holes emitting Hawking radiation: two possible starship drive technologies.
science  space  flight  physics  interstellar 
december 2009 by pw201
WHY DOES THE UNVIERSE LOOK THE WAY IT DOES: A Conversation With Sean Carroll
"Inflation does not provide a natural explanation for why the early universe looks like it does unless you can give me an answer for why inflation ever started in the first place. That is not a question we know the answer to right now. That is why we need to go back before inflation into before the Big Bang, into a different part of the universe to understand why inflation happened versus something else."
physics  cosmology  big-bang  universe  inflation  string-theory 
november 2009 by pw201
On The Possible God Of Philosophy And Cosmology Vs. The Personal, Historical God Of Faith
Camels With Hammers links to Dennett's remarks on hearing William Lane Craig's cosmological argument, and then talks about the gap between the source of the universe (which we should properly be agnostic about) and the gods of major religions.
daniel-dennett  dennett  william-lane-craig  craig  cosmology  kalam  philosophy  physics 
september 2009 by pw201
How I found glaring errors in Einstein's calculations
Pascal Boyer on common signs of being a physics crackpot. Apparently most of them are engineers.
physics  science  woo-woo  pseudoscience  engineering  pascal-boyer  crackpot 
april 2009 by pw201
Epsilon | Armor Games
Portal-esque thing flash game thing, diverting for an hour or so. Level X is supposed to finish itself and doesn't.
flash  game  games  physics  portal  puzzle 
june 2008 by pw201
Spacetime and coordinates - Richard Baker
An excellent series of pictorial articles on special relativity. The diagrams are very good.
relativity  einstein  causality  ftl  physics  science  time-travel  light-cone 
may 2008 by pw201
How Did the Universe Start? | Cosmic Variance
Sean Carroll on what physicists do and don't know about the Big Bang.
cosmology  physics  science  bigbang  relativity  sean-carroll 
january 2008 by pw201
Launchball
Fun game from the Science Musuem, although it's a bit buggy and won't always let me move stuff once I've placed it.
education  electricity  science  flash  games  game  physics  launchball  museum 
november 2007 by pw201
Quantum Cosmology
Goes into just what Hawking's imaginary time business was about.
cosmology  science  quantum  hawking  physics 
june 2007 by pw201
Movement of Existence: Leibniz's Cosmological Argument
Similar debate on cosmological arguments to the one I'm having at the moment.
physics  philosophy  theism  atheism  cosmology  kalam  craig 
june 2007 by pw201
Physics for future Presidents
A largely non-mathematical physics course.
physics  lectures 
june 2007 by pw201
A physics teacher begs for his subject back: An open letter to the AQA board and the UK Department for Education
An open letter to the AQA exam board complaining about the lack of physical content in their physics GCSE. Rather frightening.
children  education  physics  politics  science  uk  teaching  GCSE  AQA 
june 2007 by pw201
A review of The Physics of Christianity by Frank J. Tipler
Victor J. Stenger presents scientific justification for Christianity.
tipley  omega  physics  christianity 
may 2007 by pw201
A Critique of the Kalam Cosmological Argument
Critique of William Lane Craig's arguments from creation.
creation  craig  religion  bigbang  physics  philosophy  kalam 
march 2007 by pw201
Oracle
Greg Egan short where fictionalised Alan Turing meets C.S. Lewis
egan  lewis  turing  ai  physics  sci-fi  sf 
february 2007 by pw201
The God Conundrum | Cosmic Variance
Another interesting response to Terry Eagleton's review of "The God Delusion".
Dawkins  physics  religion  Eagleton  Atheism 
november 2006 by pw201

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