PLato said,"Look to the perfection of the heavens for truth," while Aristotle said "look around you at what is, if you would know the truth" To Remember: Eskesthai
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| Hey LIGO |
How’s it going, LIGO?
Members of the public can use Hey LIGO; they just might be disappointed if they’re looking for the kind of quippy, vocalized replies we’ve come to expect from our digital assistants. Hey LIGO is more likely to spit out links to technical reports and schematics. But for researchers, that’s just fine
The Laser Interferometer Gravitational-Wave Observatory has a new digital assistant. Symmetry Magazine
Advanced LIGO is searching for gravitational waves - what will it find, and what will it mean? Caltech LIGO scientists Kip Thorne, Sarah Gossan, and Rana Adhikari answer your questions. More information: http://ligo.caltech.eduSee Also: LIGO as video source page. Video is for education purposes only.
The European Space Agency (ESA) has recently begun choosing candidates for the next large mission launch slots. The first step was the submission of white papers advocating science themes. Out of many candidates, ESA now selected two.
"We had a difficult task in deciding which scientific themes to choose from all of the excellent candidates, but we believe that missions to study the hot, energetic Universe and gravitational waves will result in discoveries of the greatest importance to cosmology, astrophysics, and physics in general," says Catherine Cesarsky, chair of the Senior Survey Committee of the European Space Agency.
The two selected since themes are:
The Hot and Energetic Universe, addressed by the Athena mission
http://www.the-athena-x-ray-observato...
and
The Gravitational Universe, addressed by the eLISA mission
https://www.elisascience.org/
Gravitational wave observations will enable studies of: the formation and growth of massive black holes and their co-evolving host galaxies; structure formation; stellar populations and dynamics in galactic nuclei; compact stars; the structure of our Galaxy; General Relativity in extreme conditions; cosmology; and searches for new physics. Information from LISA sources will provide unique insight into extraordinary astrophysical objects. Combined with electromagnetic observations, these insights will advance the broader scientific understanding. LISA Project Office
Gravitational waves have a polarization pattern that causes objects to expand in one direction, while contracting in the perpendicular direction. That is, they have spin two. This is because gravity waves are fluctuations in the tensorial metric of space-time.
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| WMAP image of the Cosmic Microwave Background Radiation |
In this example I’m going to map speed to the pitch of the note, length/postion to the duration of the note and number of turns/legs/puffs to the loudness of the note.See: How to make sound out of anything.
In the late 1950s, Weber became intrigued by the relationship between gravitational theory and laboratory experiments. His book, General Relativity and Gravitational Radiation, was published in 1961, and his paper describing how to build a gravitational wave detector first appeared in 1969. Weber's first detector consisted of a freely suspended aluminium cylinder weighing a few tonnes. In the late 1960s and early 1970s, Weber announced that he had recorded simultaneous oscillations in detectors 1000 km apart, waves he believed originated from an astrophysical event. Many physicists were sceptical about the results, but these early experiments initiated research into gravitational waves that is still ongoing. Current gravitational wave experiments, such as the Laser Interferometer Gravitational Wave Observatory (LIGO) and Laser Interferometer Space Antenna (LISA), are descendants of Weber's original work. See:Joseph Weber 1919 - 2000
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| An artist's impression of two stars orbiting each other (left). The orbit shrinks as the system emits gravitational waves (middle). When the stars merge (right), there is a resulting powerful emission of gravitational waves. [Image: NASA] |
The LIGO and Virgo gravitational-wave detectors have been hunting for signals from the collisions of neutron stars and black holes, which are dense objects formed from the remains of stars many times more massive than our Sun. When two of these objects orbit each other in a binary system, the emission of gravitational waves will gradually carry away some of their orbital energy, forcing them to get closer and closer together. This happens slowly at first, but as the orbit gets tighter the gravitational waves get stronger and the process accelerates until eventually the stars collide and merge, emitting in the last few seconds one of the most powerful outflows of energy in the Universe. See: What gravitational waves can tell us about colliding stars and black holes
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| The LIGO Hanford Control Room |
LIGO's mission is to directly observe gravitational waves of cosmic origin. These waves were first predicted by Einstein's general theory of relativity in 1916, when the technology necessary for their detection did not yet exist. Gravitational waves were indirectly suggested to exist when observations were made of the binary pulsar PSR 1913+16, for which the Nobel Prize was awarded to Hulse and Taylor in 1993.
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| The Binary Pulsar PSR 1913+16: |
John Archibald Wheeler (born July 9, 1911) is an eminent American theoretical physicist. One of the later collaborators of Albert Einstein, he tried to achieve Einstein's vision of a unified field theory. He is also known as the coiner of the popular name of the well known space phenomenon, the black hole.
COSMIC SEARCH: How did you come up with the name "black hole"?
John Archibald Wheeler: It was an act of desperation, to force people to believe in it. It was in 1968, at the time of the discussion of whether pulsars were related to neutron stars or to these completely collapsed objects. I wanted a way of emphasizing that these objects were real. Thus, the name "black hole".
The Russians used the term frozen star—their point of attention was how it looked from the outside, where the material moves much more slowly until it comes to a horizon.* (*Or critical distance. From inside this distance there is no escape.) But, from the point of view of someone who's on the material itself, falling in, there's nothing special about the horizon. He keeps on going in. There's nothing frozen about what happens to him. So, I felt that that aspect of it needed more emphasis.
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| Dr. Kip Thorne, Caltech 13 |
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| Figure 1: Gravitational wave strain and strain sensitivity for a 5 year observation with PTAs. The red dashed line is the approximate strain sensitivity for current PTAs (11), and the green dashed line shows the previous estimate for the stochastic signal strength that is currently in standard use for PTA analyses (13, 14). The dark blue solid line corresponds to our mean estimate for the stochastic signal strength, with the blue shaded region bound by thin solid blue lines showing our 95% confidence interval for this estimate, based on the observational uncertainties of our model parameters. The light blue (△ACD) and cyan (△ABE) shaded regions show the area corresponding to the square root of the 2 integrand, to be integrated over logarithmic frequency intervals as in Eq. (3), for our expected SNR of 8, and the SNR of 2 expected from previous estimates (13, 14), respectively. See: The Imminent Detection Of Gravitational Waves From Massive Black-Hole Binaries With Pulsar Timing Arrays |
A history of gravity, and a study of its importance and relevance to our lives, as well as its influence on other areas of science.Physicists will tell you that four forces control the universe. Of these, gravity may the most obvious, but it is also the most mysterious. Newton managed to predict the force of gravity but couldn’t explain how it worked at a distance. Einstein picked up on the simple premise that gravity and acceleration are interchangeable to devise his mind-bending general relativity, showing how matter warps space and time. Not only did this explain how gravity worked – and how apparently simple gravitation has four separate components – but it predicted everything from black holes to gravity’s effect on time. Whether it’s the reality of anti-gravity or the unexpected discovery that a ball and a laser beam drop at the same rate, gravity is the force that fascinates. Gravity: How the Weakest Force in the Universe Shaped Our Lives
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| We can learn about the first fraction of a second, among other things, by studying the polarization pattern of the CMB...Yuki D. Takahashi |
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| [Dr. Kip Thorne, Caltech 01] |
The mystery of time travel is explored as we embark on an adventure to reveal if traveling into the future will one day be a reality. Next we examine if traveling into the past will have bizarre consequences. Finally, are scientists on the verge of discovering an Earth-like planet within the next few years?
I just noticed that last week’s episode of The Universe on Time Travel, which I told you about here and here, is available online on their website. Click here to learn more about the ins and outs of it, and I show you how to make one too! Kind of.Clifford of Asymptotia
The Cosmos sings with many strong gravitational voices, causing ripples in the fabric of space and time that carry the message of tremendous astronomical events: the rapid dances of closely orbiting stellar remnants, the mergers of massive black holes millions of times heavier than the Sun, the aftermath of the Big Bang. These ripples are the gravitational waves predicted by Albert Einstein's 1915 general relativity; nearly one century later, it is now possible to detect them. Gravitational waves will give us an entirely new way to observe and understand the Universe, enhancing and complementing the insights of conventional astronomy.
LISA, the Laser Interferometer Space Antenna, is a joint NASA–ESA mission to observe astrophysical and cosmological sources of gravitational waves of low frequencies (0.03 mHz to 0.1 Hz, corresponding to oscillation periods of about 10 hours to 10 seconds). This frequency band contains the emission from massive black-hole binaries that form after galactic mergers; the song of compact stellar remnants as they slowly spiral to their final fate in the black holes at the centers of galaxies; the chorus of millions of compact binariesshortly after the Big Bang.
LISA consists of three identical spacecraft flying in a triangular constellation, with equal arms of 5 million kilometers each. As gravitational waves from distant sources reach LISA, they warp space-time, stretching and compressing the triangle. Thus, by precisely monitoring the separation between the spacecraft, we can measure the waves; and by studying the shape and timing of the waves we can learn about the nature and evolution of the systems that emitted them.
The most important thing is to be motivated by your own intellectual curiosity.KIP THORNE
Fig. 1. The four forces (or interactions) of Nature, their force carrying particles and the phenomena or particles affected by them. The three interactions that govern the microcosmos are all much stronger than gravity and have been unified through the Standard Model
See: LIGO Listens for Gravitational Echoes of the Birth of the Universe
Results set new limits on gravitational waves originating from the Big Bang; constrain theories about universe formation
Pasadena, Calif.—An investigation by the LIGO (Laser Interferometer Gravitational-Wave Observatory) Scientific Collaboration and the Virgo Collaboration has significantly advanced our understanding of the early evolution of the universe.
Analysis of data taken over a two-year period, from 2005 to 2007, has set the most stringent limits yet on the amount of gravitational waves that could have come from the Big Bang in the gravitational wave frequency band where LIGO can observe. In doing so, the gravitational-wave scientists have put new constraints on the details of how the universe looked in its earliest moments.
Much like it produced the cosmic microwave background, the Big Bang is believed to have created a flood of gravitational waves—ripples in the fabric of space and time—that still fill the universe and carry information about the universe as it was immediately after the Big Bang. These waves would be observed as the "stochastic background," analogous to a superposition of many waves of different sizes and directions on the surface of a pond. The amplitude of this background is directly related to the parameters that govern the behavior of the universe during the first minute after the Big Bang.
Earlier measurements of the cosmic microwave background have placed the most stringent upper limits of the stochastic gravitational wave background at very large distance scales and low frequencies. The new measurements by LIGO directly probe the gravitational wave background in the first minute of its existence, at time scales much shorter than accessible by the cosmic microwave background.
The research, which appears in the August 20 issue of the journal Nature, also constrains models of cosmic strings, objects that are proposed to have been left over from the beginning of the universe and subsequently stretched to enormous lengths by the universe's expansion; the strings, some cosmologists say, can form loops that produce gravitational waves as they oscillate, decay, and eventually disappear.
Gravitational waves carry with them information about their violent origins and about the nature of gravity that cannot be obtained by conventional astronomical tools. The existence of the waves was predicted by Albert Einstein in 1916 in his general theory of relativity. The LIGO and GEO instruments have been actively searching for the waves since 2002; the Virgo interferometer joined the search in 2007.
The authors of the new paper report that the stochastic background of gravitational waves has not yet been discovered. But the nondiscovery of the background described in the Nature paper already offers its own brand of insight into the universe's earliest history.
Labyrinth on the portico of the cathedral of San Martino at Lucca, Tuscany, Italy.The term labyrinth is often used interchangeably with maze, but modern scholars of the subject use a stricter definition. For them, a maze is a tour puzzle in the form of a complex branching passage with choices of path and direction; while a single-path (unicursal) labyrinth has only a single Eulerian path to the center. A labyrinth has an unambiguous through-route to the center and back and is not designed to be difficult to navigate.
This unicursal design was widespread in artistic depictions of the Minotaur's Labyrinth, even though both logic and literary descriptions of it make it clear that the Minotaur was trapped in a multicursal maze.[2]
A labyrinth can be represented both symbolically and physically. Symbolically, it is represented in art or designs on pottery, as body art, etched on walls of caves, etc. Physical representations are common throughout the world and are generally constructed on the ground so they may be walked along from entry point to center and back again. They have historically been used in both group ritual and for private meditation.
Buddhism
According to the scriptures, the Buddha taught a concept of rebirth that was distinct from that of any known contemporary Indian teacher. This concept was consistent with the common notion of a sequence of related lives stretching over a very long time, but was constrained by two core Buddhist concepts: anattā, that there is no irreducible ātman or "self" tying these lives together; and anicca, that all compounded things are subject to dissolution, including all the components of the human person and personality. At the death of one personality, a new one comes into being, much as the flame of a dying candle can serve to light the flame of another.[10][11]
Since, according to Buddhism, there is no permanent and unchanging self (identity) there can be no transmigration in the strict sense. Buddhism teaches that what is reborn is not the person but that one moment gives rise to another and that this momentum continues, even after death. It is a more subtle concept than the usual notion of reincarnation, reflecting the Buddhist concept of personality existing (even within one's lifetime) without a "Self". Instead of a fixed entity, what is reborn is an "evolving consciousness" (M.1.256) or "stream of consciousness" (D.3.105), whose quality has been conditioned by karma.[12]
Buddhism suggests that samsara, the process of rebirth, occurs across five or six realms of existence.[13] It is actually said in Tibetan Buddhism that it is very rare for a person to be reborn in the immediate next life as a human.[14] This depends on the karmic potentialities (or "seeds") they have created with their actions and upon their state of mind at the time of death. If we die with a peaceful mind, this will stimulate a virtuous seed and we shall experience a fortunate rebirth; but if we die with a disturbed mind, in a state of anger, say, this will stimulate a non-virtuous seed and we shall experience an unfortunate rebirth. This is similar to the way in which nightmares are triggered by our being in an agitated state of mind just before falling asleep.[15]
Illustration by The New York Times
First came the heterodyne. The principle of "beats" or difference tones between simultaneous audio pitches was well known since antiquity, but Reginald Fessenden in 1901 was the first to apply the principle to radio transmissions [3]. Originally both radio frequencies were to be transmitted, received with two antennas, and combined in a detector. Later a local oscillator was substituted for one of the transmitter-receiver combinations and the heterodyne as we know it was born. Fessenden himself coined the term, from the Greek heteros (other) and dynamis (force).Who Invented the Superheterodyne?
Dr. Kip Thorne, Caltech 01-Relativity-The First 20th Century RevolutionThis device is also used to dial into the history and memory of a soul and their functions of the past, as they are revealed through this screen.
AS with Einstein, who was Socrates daemon?:)See:Fullerane and Allotropes
In Plato's Apology of Socrates, Socrates claimed to have a daimonion (literally, a "divine something")[6] that frequently warned him - in the form of a "voice" - against mistakes but never told him what to do
Death of Socrates by Jacques Davidthis picture depicts the closing moments of the life of Socrates. Condemned to death or exile by the Athenian government for his teaching methods which aroused scepticism and impiety in his students, Socrates heroicly rejected exile and accepted death from hemlock.
Self portrait of Jacques-Louis David, 1794, Musée du LouvreHere the philosopher continues to speak even while reaching for the cup, demonstrating his indifference to death and his unyielding commitment to his ideals. Most of his disciplines and slaves swirl around him in grief, betraying the weakness of emotionalism. His wife is seen only in the distance leaving the prison. Only Plato, at the foot of the bed and Crito grasping his master's leg, seem in control of themselves.See:Jacques-Louis David: The Death of Socrates
Plato defined a philosopher firstly as its eponymous occupation – wisdom-lover. He then distinguishes between one who loves true knowledge as opposed to simple sights or education by saying that a philosopher is the only man who has access to Forms – the archetypal entities that exist behind all representations of the form (such as Beauty itself as opposed to any one particular instance of beauty). It is next and in support of the idea that philosophers are the best rulers that Plato fashions the ship of state metaphor, one of his most often cited ideas (along with his allegory of the cave). "[A] true pilot must of necessity pay attention to the seasons, the heavens, the stars, the winds, and everything proper to the craft if he is really to rule a ship" (The Republic, 6.488d). Plato claims that the sailors (i.e., the people of the city-state over whom the philosopher is the potential ruler) ignore the philosopher's "idle stargazing" because they have never encountered a true philosopher before.
Stargazers by Paul Rossetti Bjarnson, Pg 102, Chapter XV
Dennis William Siahou Sciama FRS (November 18, 1926–December 18, 1999) was a British physicist who, through his own work and that of his students, played a major role in developing British physics after the Second World War.Sciama also strongly influenced Roger Penrose, who dedicated his The Road to Reality to Sciama's memory. The 1960s group he led in Cambridge (which included Ellis, Hawking, Rees, and Carter), has proved of lasting influence.
Plotinus (Greek: Πλωτῖνος) (ca. AD 204–270) was a major philosopher of the ancient world who is widely considered the founder of Neoplatonism (along with his teacher Ammonius Saccas). Much of our biographical information about him comes from Porphyry's preface to his edition of Plotinus' Enneads.Plotinus taught that there is a supreme, totally transcendent "One", containing no division, multiplicity or distinction; likewise it is beyond all categories of being and non-being. The concept of "being" is derived by us from the objects of human experience called the dyad, and is an attribute of such objects, but the infinite, transcendent One is beyond all such objects, and therefore is beyond the concepts that we derive from them. The One "cannot be any existing thing", and cannot be merely the sum of all such things (compare the Stoic doctrine of disbelief in non-material existence), but "is prior to all existents". Thus, no attributes can be assigned to the One. We can only identify it with the Good and the principle of Beauty. [I.6.9]
For example, thought cannot be attributed to the One because thought implies distinction between a thinker and an object of thought (again dyad). Even the self-contemplating intelligence (the noesis of the nous) must contain duality. "Once you have uttered 'The Good,' add no further thought: by any addition, and in proportion to that addition, you introduce a deficiency." [III.8.10] Plotinus denies sentience, self-awareness or any other action (ergon) to the One [V.6.6]. Rather, if we insist on describing it further, we must call the One a sheer Dynamis or potentiality without which nothing could exist. [III.8.10] As Plotinus explains in both places and elsewhere [e.g. V.6.3], it is impossible for the One to be Being or a self-aware Creator God. At [V.6.4], Plotinus compared the One to "light", the Divine Nous (first will towards Good) to the "Sun", and lastly the Soul to the "Moon" whose light is merely a "derivative conglomeration of light from the 'Sun'". The first light could exist without any celestial body.
What good is a universe without somebody around to look at it?
Robert Dicke
This summer, CERN gave the starting signal for the long-distance neutrino race to Italy. The CNGS facility (CERN Neutrinos to Gran Sasso), embedded in the laboratory's accelerator complex, produced its first neutrino beam. For the first time, billions of neutrinos were sent through the Earth's crust to the Gran Sasso laboratory, 732 kilometres away in Italy, a journey at almost the speed of light which they completed in less than 2.5 milliseconds. The OPERA experiment at the Gran Sasso laboratory was then commissioned, recording the first neutrino tracks.
Secrets of the PyramidsIn a boon for archaeology, particle physicists plan to probe ancient structures for tombs and other hidden chambers. The key to the technology is the muon, a cousin of the electron that rains harmlessly from the sky.How can a speck of a universe be physically identical to the great expanse we view in the heavens above? (Greene, The Elegant Universe, pages 248-249)
As Alice learned, it's not always clear what's a looking glass, and what's a window to another world. Mirrors and windows are often interchangeable: we look out into the world, and see ourselves reflected back. We look at a reflection, and believe it's showing us a world beyond. We internalize the mirror image and project the one inside. Objects, actions and ideas can become so confused with their reflections that it's impossible to untangle them. What's phantom and what's real? Is there even a relevant difference?
"The worst disease afflicting human kind is hardening of the categories." - Artist Bob Miller.
Miracles StudiosThrone PlatesTo activate Thorne plates, the distance between each plate must be less than the width of an atom. The resulting wormhole will be equally small, so getting in and out might be difficult. To widen the portal, some scientists suggest using a laser to inject immense amounts of negative energy. In addition, Thorne believes that radiation effects created by gravitons, or particles of gravity, might fry you as you enter the wormhole. According to string theory, however, this probably won't happen, so it's scant reason to cancel your trip.
Miracles StudiosGott LoopTo take you back one year, the string must weigh about half as much as the Milky Way galaxy. You'll need a mighty big spaceship to make that rectangle.
Many scientists believe the big bang that created the universe left behind cosmic strings - thin, infinitely long filaments of compressed matter. In 1991, Princeton physicist J. Richard Gott discovered that two of these structures, arranged in parallel and moving in opposite directions, would warp space-time to allow travel to the past. He later reworked the idea to involve a single cosmic-string loop. A Gott loop can take you back in time but not forward. The guide to building your own:
Miracles StudiosGott ShellThis is a relatively slow method of time travel, and life inside the shell could become tedious.
In essence, a Gott shell is a huge concentration of mass. The shell's sheer density creates a gravitational field that slows down the clock for anyone enclosed within it. Outside, time rolls along at its familiar pace, but inside, it creeps. Thus the Gott shell is useful for travel into the future only. If you're planning a jaunt to the past using a Gott loop, you might want to bring along a Gott shell for the return trip. What to do, step by step:
Miracles StudiosVan Stokum CylinderThe cylinder must be infinitely long, which could add slightly to its cost.
Mass and energy act on space-time like a rock thrown into a pond: the bigger the rock, the bigger the ripples. Physicist W. J. van Stockum realized in 1937 that an immense cylinder spinning at near-light speed will stir space-time as though it were molasses, pulling it along as the cylinder turns. Although Van Stockum himself didn't recognize it, anyone orbiting such a cylinder in the direction of the spin will be caught in the current and, from the perspective of a distant observer, exceed the speed of light. The result: Time flows backward. Circle the cylinder in the other direction with just the right trajectory, and this machine can take you into the future as well. How it works:
Kerr RingThe Kerr ring is a one-way ticket. The black hole's gravity is so great that, once you step through it, you won't be able to return.See:A User's Guide to Time Travel-Superpower Issue
When Karl Schwarzschild solved Einstein's equations in 1917, he found that stars can collapse into infinitesimally small points in space - what we now call black holes. Four decades later, physicist Roy Kerr discovered that some stars are saved from total collapse and become rotating rings. Kerr didn't regard these rings as time machines. However, because their intense gravity distorts space-time, and because they permit large objects to enter on one side and exit on the other in one piece, Kerr-type black holes can serve as portals to the past or the future. If finding one with the proper dimensions is too much trouble, you can always build one yourself:
Welcome to the mirror world, in which every particle in the known universe could have a counterpart. This cosmos would hold mirror planets, mirror stars, and even mirror life.
Crucifixion (Corpus Hypercubus) (1954)-Salvador Domingo Felipe Jacinto Dalí i Domènech, 1st Marquis of Púbol (May 11, 1904 – January 23, 1989), was a Spanish surrealist painter born in Figueres, Catalonia, Spain.
Image Source: The Universe in a Nutshell, by Stephen Hawking, page 198
A tesserack or hypercube is a four dimensional analogue of a cube. See the figure on the left for a 2-D representation of this 4-D object. More information about these can be seen and found. Many people have difficulty believing such can exist which is why such books as Flatland (Abbott, 1884), Sphereland (Burgers, 1983), and Flatterland (Stewart, 2001) were written.
