Tagphysics

Sending and Searching for Interstellar Messages

Received a link from Mr. Zaitsev’s comment on the “Who Speaks For Earth” post. Since it’s no longer on this page I thought I’d post the link to his earlier paper for those who would like to read it.

“There is a close interrelation between Searching for Extraterrestrial Intelligence (SETI) and Messaging to Extraterrestrial Intelligence (METI). For example, the answers to the questions “Where to search” and “Where to send” are equivalent, in that both require an identical selection from the same target star lists. Similar considerations lead to a strategy of time synchronization between sending and searching. Both SETI and METI use large reflectors. The concept of “magic frequencies” may be applicable to both SETI and METI. Efforts to understand an alien civilization’s Interstellar Messages (IMs), and efforts to compose our own IMs so they will be easily understood by unfamiliar Extraterrestrials, are mutually complementary. Furthermore, the METI-question: “How can we benefit from sending IMs, if a response may come only thousands of years later?” begs an equivalent SETI-question: “How can we benefit from searching, if it is impossible now to perceive the motivations and feelings of those who may have sent messages in the distant past?” A joint consideration of the theoretical and the practical aspects of both sending and searching for IMs, in the framework of a unified, disciplined scientific approach, can be quite fruitful. We seek to resolve the cultural disconnect between those who advocate sending interstellar messages, and others who anathematize those who would transmit.”

(Sending and Searching for Interstellar Messages)

(Link to other papers written by Alexander Zaitsev)

(Thanks to Alexander Zaitsev!)

Zero-G makes all but 4 sex-positions impossible

US and Russian astronauts have had sex in space for separate research programmes on how human beings might survive years in orbit, according to a book published yesterday.

Pierre Kohler, a respected French scientific writer, says in The Final Mission: Mir, The Human Adventure that the subject is taboo both at Nasa and at mission control in Moscow, but that cosmic couplings have taken place.

[…]

Only four positions were found possible without “mechanical assistance”. The other six needed a special elastic belt and inflatable tunnel, like an open-ended sleeping bag.

Mr Kohler says: “One of the principal findings was that the classic so-called missionary position, which is so easy on earth when gravity pushes one downwards, is simply not possible.”

Full Story: Guardian.

(via Robot Wisdom)

Criticism of Lisi’s E8 “theory of everything”

Lubo? Motl, co-founder of matrix string theory, thinks Lisi is a hack.

String theory critic Peter Woit is skeptical but not dismissive, as is Ars Technica writer Chris Lee.

Surfer’s theory explained in 2 minute video

See: Surfer dude stuns physicists with theory of everything.

(via Robot Wisdom).

Surfer dude stuns physicists with theory of everything

An impoverished surfer has drawn up a new theory of the universe, seen by some as the Holy Grail of physics, which has received rave reviews from scientists.

Garrett Lisi, 39, has a doctorate but no university affiliation and spends most of the year surfing in Hawaii, where he has also been a hiking guide and bridge builder (when he slept in a jungle yurt).

In winter, he heads to the mountains near Lake Tahoe, Nevada, where he snowboards. “Being poor sucks,” Lisi says. “It’s hard to figure out the secrets of the universe when you’re trying to figure out where you and your girlfriend are going to sleep next month.”

Despite this unusual career path, his proposal is remarkable because, by the arcane standards of particle physics, it does not require highly complex mathematics.

Even better, it does not require more than one dimension of time and three of space, when some rival theories need ten or even more spatial dimensions and other bizarre concepts. And it may even be possible to test his theory, which predicts a host of new particles, perhaps even using the new Large Hadron Collider atom smasher that will go into action near Geneva next year.

Full Story: The Telegraph.

(via The Agitator).

A quantum theory of consciousness that can be taken seriously?

I usually roll my eyes when I read something about quantum theory and consciousness because, as this Telegraph article says:

The use of quantum mechanics this way has been controversial for two reasons: first, this highly mathematical theory is routinely abused by charlatans attempting to explain spooky paranormal phenomena; and, second, scientists cannot even agree on a definition of consciousness, undermining any quest to explain it.

But now, supposedly, someone’s come up with a non-bullshit theory:

Prof Manousakis has now laid out a theory of how a quantum effect could influence image flips in binocular rivalry studies and then, as good science demands, made some predictions.

His predictions are based on the rate that nerve cells fired in the brain. It turns out that the hallucinogenic drug LSD can slow the firing rate of brain cells and, when he factored this effect into his quantum model, he predicted the flip rates would change too.

This is precisely what subjects who took LSD reported in experiments conducted by another group. “My theory simply explains their findings in a simple way,” he told The Daily Telegraph.

Prof Manousakis has now made more predictions that can be tested, based on what happens when subjects glance at the cube from time to time.

This, he believes, could shed light on how our awareness of the passage of time changes, depending on how busy we are, since his theory suggests that when a stimulus such as vision freezes, the perceived time slows to a standstill.

I don’t get it. I suppose I’ll have to either read the paper or find another article on it.

Full Story: The Telegraph.

(via Telarus).

Other universes may be detectable, published study claims

If there are oth?er un?iverses out there-as some sci?en?tists pro?pose-then one or more of them might be de?tect?a?ble, a new study sug?gests.

Such a find?ing, ‘while cur?rently spec?u?la?tive even in prin?ci?ple, and probably far-off in prac?tice, would surely con?sti?tute an ep?och?al dis?cov?ery,’ re?search?ers wrote in a pa?per de?tail?ing their stu?dy. The work ap?pears in the Sep?tem?ber is?sue of the re?search jour?nal Phys?i?cal Re?view D.

Cos?mol?o?gists gen?er?ally hold that even if oth?er un?iverses ex?ist, a con?tro?ver?sial idea it?self, they would?n’t be vis?i?ble, and that test?ing for their ex?istence would be hard at best.

A half-sky map of slight tem?per?a?ture vari?a?tions in the cos?mic mi?cro?wave back?ground ra?di?a?tion, thought to map struc?tures in the very ear?ly uni?verse. Blue stands for colder ar?eas; red for hot?ter re?gions, where it’s be?lieved mat?ter was dens?er. These dense re?gions are thought to have lat?er be?come ga?laxy-rich zones. The boxed ar?ea marks an un?u?su?al “cold spot” re?search?ers rec?og?nize in the da?ta. An un?ex?plained gi?ant cos?mic void has also been found in the di?rec?tion of that spot. In a new stu?dy, the?o?ret?i?cal phys?i?cists ar?gue that some sort of ir?reg?u?lar?ity in the mi?cro?wave back?ground, and in mat?ter dis?tri?bu?tion, might in?di?cate where our uni?verse once knocked in?to an?oth?er one. But the re?search?ers take no po?si?tion on wheth?er this cold spot could be the anom?a?ly they’re look?ing for. Much more work is needed, they say.

But the new stu?dy, by three sci?en?tists at the Un?ivers?ity of Cal?i?for?nia, San?ta Cruz, pro?poses that neigh?bor?ing un?iverses might leave a vis?i?ble mark on our own-if, per?chance, they have knocked in?to it. For such a scar to be de?tect?a?ble, they add, the col?li?sion might have had to take place when our un?iverse was very young. Just how the bruise might look re?mains to be clar?i?fied, they say.

Full Story: World of Science.

(Thanks James!)

Scientists slow down light

Scientists have used silicon crystals to trap light and slow it down to the lowest speed ever recorded in the material. The breakthrough is a step towards light-based storage for quantum computers.

Researchers at Japanese telco NTT used man-made photonic crystals, which contain nanoscale holes, to achieve the feat. The cavity which controlled the light was less than ten millionths of a metre long.

Full Story: The Register.

Hubble Spies Dazzling Death of a Sunlike Star

death of a star

Full Story: National Geographic.

(Thanks Ulysses Lazarus).

The World as Hologram

UC Berkeley’s Raphael Bousso presents a friendly introduction to the ideas behind the holographic principle, which may be very important in the hunt for a theory of quantum gravity.

Series: “Lawrence Berkeley National Laboratory Summer Lecture Series”

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