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Topic: Cosmic inflation

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In the News (Tue 23 Apr 19)

 Inflation (disambiguation) - Wikipedia, the free encyclopedia
Cosmic inflation, the idea in cosmology, astrophysics, and astronomy—first proposed by Alan Guth (1981)—that the nascent universe passed through a phase of exponential expansion that was driven by a negative energy density (with negative vacuum pressure).
Inflation fetishism (aka "inflatophilia"), the process, through role-playing, art, or real-life scenarios, by which someone is inflated by any of various substances, usually by air, fat, liquid, and/or muscle.
Inflation (matter), distention of matter by a fluid or gas with respect to a system of matter. /wiki/Inflation_(disambiguation)   (169 words)

 Cosmic inflation - Wikipedia, the free encyclopedia
Cosmic inflation is the idea, first proposed by Alan Guth in 1981, that the nascent universe passed through a phase of exponential expansion (the inflationary epoch) that was driven by a negative pressure vacuum energy density.
In some models of cosmic inflation (mostly due to Andre Linde), inflation is an eternal process; on a large scale the universe expands without end, with the the cosmos we live in eventually developing from a region where inflation came to an end.
The original model of inflation proposed by Guth, which postulated that inflation is caused by a false vacuum did not have a graceful exit: it ended too soon and the reheating process destroyed some of the predictions of inflation. /wiki/Cosmic_inflation   (1109 words)

 Talk:Cosmic inflation - Wikipedia, the free encyclopedia
WMAP supports cosmic inflation but it is one of several supporting bits of evidence.
There is still a fine tuning problem with any known inflation models, where fine tuning has a technical meaning, but this is not the graceful exit problem of the old inflation based on a false vacuum.
There was indeed a much larger energy density during the early universe inflation than the energy density which we observe in the universe today, but this is not necessarily a false vacuum. /wiki/Talk:Cosmic_inflation   (704 words)

 Science News: From soup to us: cosmic ripples test inflation.... @ HighBeam Research
Guth's theory, called inflation, postulates that the gigantic energy of a young hot universe would act as antigravity causing expansion from a universal radius of proton-size to that of cosmic size.
The variations therefore have remained essentially frozen, untouched by cosmic events in the 300,000 years between the end of inflation and the time radiation was freed.
If the simplest model of inflation is correct, then 95 percent of the universe is made up of some other, exotic type of material that doesn't emit light and can't be seen. /library/doc0.asp?DOCID=1G1:19517778&refid=ip_encyclopedia_hf   (2178 words)

 Open Questions: Cosmic Strings
Cosmic strings are (if they exist) topological defects in spacetime that should have formed during a phase transition which occurred in the earliest instants of the Big Bang.
Cosmic strings are hypothesized thin, massive tubes of high-energy vacuum formed in a phase transition of the very early universe.
Topological defects in the early universe, such as cosmic strings and textures, may help explain density fluctuations of matter which eventually led to large scale structure in the present universe. /oq-co003.htm   (218 words)

 Open Questions: Cosmic Inflation
The theories of cosmic inflation and unification of fundamental forces have shown the close interdependence of comomology and particle physics.
The theory of cosmic inflation that occurred to Alan Guth in 1979, was originally just a wild guess of the sort that theoretical physicists play with all the time.
Inflation solved a number of problems with the early big bang model, and in the 23 years since the idea originated, all observable evidence is still consistent with it. /oq-co004.htm   (599 words)

 Parcellular Inflation/Gravitation & the Space of Local Forces
Cosmic inflation per se, on the other hand, does not begin to interpret the meaning of quantum non-locality at the present epoch, nor does it explain why an enormous cosmological constant is not visibly distorting spacetime on the scale of the room you are in - or the scale of this page, or even less.
It is because of the global symmetry of that projection at every here-and-now, dramatised in the metaphor of a democratic cosmic inflation of spacetime, that "the gravitational field", which is spacetime, operates both as a constraint which we call an "attraction" between proximate masses and as a "repulsion" between remote masses.
Inflation, we will soon see, is cognate with a combinatorial (or decombinatorial) procedure, the exponential numerical enlargement by parcellular "mitosis" of a set of non-local topological relations, defining an abstract, complex projective spacetime that has no intrinsic spatial or temporal scale or orientation. /parc.mech.12.htm.htm   (7451 words)

 Quantum Universe
Constraints on cosmic parameters, such as the curvature of the universe, and the nature of the cosmic structure, are in broad agreement with the predictions of inflationary theory.
Cosmic inflation is the hand that balanced the pencil on its point.
One possibility is that cosmic inflation originated with a form of dark energy, akin to the dark energy observed today. /quantumuniverse/questions/q8.html   (921 words)

 Alignment Theory: New Quantum Relativity Theory of Everything
Cosmic Inflation is directly linked to, and exponentially driven by, the degree of Alignment / mass field density, moment to moment.
Inflation space is "dark energy" and it drives cosmic inflation.
There will also be a dampening effect from the mass/ inflation /quantum_relativity.htm   (3106 words)

 Cosmic Inflation Theory Supported By South Pole Test
Inflation created tiny lumps in the distribution of matter and tiny variations in the temperature of the cosmic microwave background, the afterglow of the big bang, sowing the seeds that stretched the fuzziness of the subatomic world to cosmic scales.
The theory, called cosmic inflation, proposes that the universe underwent a gigantic growth spurt in a fraction of a second just moments after the Big Bang.
According to inflation, the largest structures in the universe trace their origins to the fundamental fuzziness of the subatomic world. /stories/20012/0430012.htm   (702 words)

 Inflationary Cosmology
Recent observations of the cosmic microwave background radiation in the post-inflationary universe support the inflation theory.
The mechanism to drive the inflation is related to a "yet-to-be-discovered" inflaton field, which is thought to be similar to the Higgs fields responsible for the mass of the elementary particles.
One of the successes with the inflation theory was that it solved this so-called "monopole problem": monopoles would be exponentially diluted during the inflation, to such an extent that there would be little chance of even one in the Milky Way. /R02-13-inflation.htm   (1195 words)

 symmetry - December 2004/January 2005 - The Growth of Inflation
Guth had discovered cosmic inflation, an idea which some have later called the most important in cosmology since the big bang.
Inflation, while still an incomplete theory, is the standard "working model," the "dominant paradigm" for the birth of the universe.
Their "new" inflation worked by adjusting the shape of the potential function, a sort of mathematical roller-coaster that defines the properties of the inflaton. /cms?pid=1000045   (2836 words)

 Cosmic Revelations: Satellite homes in on the infant universe: Science News Online, Feb. 15, 2003
Inflation stretched to cosmic scales random patches of the fabric of space-time that had minuscule fluctuations in density, creating the lumps from which galaxies arose.
Lumps in the otherwise smooth infant universe were amplified during a growth spurt known as inflation.
Before that, the universe was so hot that there were no neutral atoms, only ions and electrons that trapped the cosmic microwave background radiation. /20030215/fob1.asp   (905 words)

 Cosmos 'Big Bubble' theorist Alan Guth to deliver Hofstadter Lecture:01/03
When he came up with the theory of cosmic inflation, Guth was a 34-year old physicist at the Stanford Linear Accelerator Center (SLAC) in the ninth year of a seemingly interminable career as a postdoctoral fellow.
His invited talk, titled "Cosmic Inflation and the Accelerating Universe," is the 2003 Robert Hofstadter Memorial Lecture.
One major puzzle solved by inflation is the fact that the universe has been observed to be remarkably uniform. /dept/news/report/news/2003/january22/hofstadter-122.html   (987 words)

 KICP Seminars: Spring 2002
The conventional picture of cosmic evolution, a combination of the big bang model and the inflationary scenario, assumes that the big bang is the beginning of space time.
The key difference is that if inflation did not occur, one must directly confront the issue of the initial state of modes whose wavelength was larger than the Hubble radius at the time at which they were "born," and one's predictions will depend on these assumptions.
This GZK cutoff is actually a kind of absorption edge in the cosmic ray spectrum: if these particles originate at distances large compared to a few Mpc, then they should be scattered and absorbed by the cosmic microwave background, which appear as gamma-rays in the rest frame of the particles. /seminars/archive_2002Spring.html   (1355 words)

 Inflation for Beginners
Inflation also predicts that the primordial perturbations may have left a trace in the form of gravitational radiation with particular characteristics, and it is hoped that detectors sensitive enough to identify this characteristic radiation may be developed within the next ten or twenty years.
As inflation begins (essentially at a point), the density is effectively "reset" to zero, and rises towards the critical density as inflation proceeds and energy from the inflation process is turned into mass.
The conventional version of inflation says that our entire visible Universe is just one of many bubbles of inflation, each doing their own thing somewhere out in an eternal sea of chaotic inflation, but that the process of rapid expansion forces spacetime in all the bubbles to be flat. /home/John_Gribbin/cosmo.htm   (6743 words)

 Cosmic Inflation
Inflation predicts that the primordial density perturbations will be about the same on all length scales
Gravity: inflation creates a large positive matter energy and a large negative gravitational energy
Inflation ends, and the expansion starts decelerating again /Phys171/lectures/inflation.html   (1258 words)

 Cosmic Inflation
Cosmic inflation is a process of extreme accelerated expansion of the Universe.
According to the standard inflationary model, proposed in 1981 by A. Guth and elaborated on by many others, the energy of the the vacuum was not zero but increased to a huge value by the inflaton field.
The quantum fluctuations of the inflaton field produced the ripples in space-time which are thought to be the primordial seeds of the galaxy formation. /www/science/inflation.html   (125 words)

 UC Davis to Host Cosmic Inflation Meeting SpaceRef - Your Space Reference
Cosmic inflation theory, first formulated 20 years ago by Alan Guth, holds that the universe expanded very rapidly in a tiny fraction of a second after the Big Bang.
The latest data and theories on cosmic inflation and the origins of the universe will be discussed at a conference at the University of California, Davis, March 22-25.
This inflation magnified slight differences in the primordial material and the first stars and galaxies then coalesced around these "wrinkles." Cosmologists can study these wrinkles by looking at the background of microwave energy in the universe-- a faint afterglow of the Big Bang. /news/viewpr.html?pid=10715   (502 words)

 Scientific American: Antarctic Experiments Back Cosmic Inflation Theory
Inflation theory, first proposed in the early 1980s, predicts that a pattern of tiny temperature differences should exist in the cosmic microwave background (CMB), the afterglow of the big bang.
Experiments conducted in 1992 using NASA's Cosmic Background Explorer provided the first images of the temperature variations, and later observations from other instruments hinted at the presence of a peak.
Of particular interest is the ratio of intensity between the first and second peaks, which indicates how much ordinary matter—the stuff of humans, stars and galaxies—exists in the universe. /print_version.cfm?articleID=0004A2D5-A1E5-1C5E-B882809EC588ED9F   (264 words)

 Cosmic Strings and Structure
The cosmic string scenario predated inflation as a realistic structure formation model, but it has proved computationally much more challenging to make robust predictions with which to confront observations.
Cosmic strings appear in the form of carrying energy, resulting from the symmetry breaking phase transition in the early universe.
Among other defects, cosmic strings have been proved to be the most potential one for cosmic structure formation. /user/gr/public/cs_lss.html   (373 words)

This is actually a type of "cosmic censorship" as in the case of black holes, because when a singularity begins to become somewhat powerful as a source of an object's gravity (as in a huge boomerang), the local mass around it all collapses into the center to cover-up the exposed singularity.
By assuming the concept of inflation is actually a two step ongoing process, that one period of inflation occurred in the early Universe followed by a second period presently, it is possible to explain several recently uncovered mysteries about the Universe.
However, if inflation is presently taking place as is proposed here, and the false-vacuum (phase-transition) state is driving the present expansion, this would have an identical effect of a cosmological constant and cause the Universe to expand. /inflation.htm   (8050 words)

 WMAP Cosmology 101: Inflationary Universe
The Inflation Theory proposes a period of extremely rapid (exponential) expansion of the universe shortly after the Big Bang.
That there should be, on average, equal numbers of hot and cold spots in the fluctuations of the cosmic microwave background temperature.
While the Big Bang theory successfully explains the shape of the cosmic microwave background spectrum and the origin of the light elements, it leaves open a number of important questions: /m_uni/uni_101inflation.html   (330 words)

 Physics Today April 2003
The discovery of cosmic speedup, perhaps one of the most important in all of science over the past 25 years, saved a beautiful theory--inflation--and presented theorists with a wonderful puzzle--"dark energy," the stuff causing cosmic speedup.
Cosmic acceleration could be signaling that Einstein's theory requires modification, perhaps due to the influence of unseen additional spatial dimensions.
Central to inflation is a very early, tremendous burst of expansion, powered by the potential energy associated with a hypothetical scalar field called the inflaton. /vol-56/iss-4/p10.html   (1891 words)

 BBC - Science & Nature - Space - Inflation
Inflation is the best theory to date to describe how this might have happened.
This theory has sparked some mind-blowing ideas - including the possibility that inflation may be an ongoing process and not just a unique event that created our own Universe.
You are here: BBC > Science and Nature > Space > Origins > Inflation /science/space/origins/inflation   (325 words)

 Cosmic Inflation Probe Home Page
CIP will measure the shape of cosmic inflation potential by conducting a space-based near-infrared large-area redshift survey capable of detecting galaxies that formed early in the history of the universe.
Cosmic Inflation Probe (CIP), Gary Melnick, Smithsonian Astrophysical Observatory, Cambridge, Mass.
HORUS will conduct a step-wise, systematic investigation of star formation in the Milky Way, nearby galaxies and the high-redshift universe; the origin of the elements and cosmic structure; and the composition of and physical conditions in the extended atmospheres of extrasolar planets. /cip/welcome.html   (563 words)

 NASA GSRP for BICEP 2005-2008
Probing Inflation with a CMB Polarization Telescope at the South Pole
Inflation is a testable scenario for the earliest event in the history of the universe (the first ~10
Detecting this relic from inflation in the CMB polarization would be a triumph and opportunity for fundamental physics. /~yuki/GSRP/gsrp.htm   (2103 words)

 The Inflationary Universe
Although inflation has many attractive features, it is not yet a proven theory because many of the details still do not work out right in realistic calculations without making assumptions that are poorly justified.
Probably most cosmologists today believe inflation to be correct at least in its outlines, but further investigation will be required to establish whether this is indeed so.
In the corresponding theory of inflation, the Universe, because of properties of elementary particles not accounted for in the standard big bang models, expands for a fleeting instant at its beginning at a much higher rate than that expected for the big bang. /astr162/lect/cosmology/inflation.html   (644 words)

 "Cosmic Inflation" to be Focus of Rustgi Lecture - UB NewsCenter
The recently discovered acceleration of the cosmic expansion has altered radically the picture of the universe, but also has helped to confirm the basic predictions of inflation.
His theory of inflationary cosmology, a modification of the hot big-bang theory, offers possible explanations for a number of features of the universe, including its uniformity, the value of its mass density, and the properties of the faint ripples that are now being observed in the cosmic background radiation.
In related work, Guth and colleagues at MIT have explored the theoretical possibility of igniting inflation in a hypothetical laboratory, resulting in construction of a new universe. /news/fast-execute.cgi/article-page.html?article=75050009   (346 words)

 Symmetry-breaking and Molecular Evolution/1
Cosmic Inflation: A universe in a symmetrical state, but below its unification temperature is in an unstable high-energy false vacuum.
The Cosmic Interaction Sequence: The Pathway to the Planetary Biosphere Galaxy formation is followed by the generation of the chemical nuclei in the supernova explosion of a short-lived hot star.
The cosmic abundance of the elements fig1(d) reflects the binding energies of the nuclei and stable a-particle-like shells (Moeller et. /book/biocos/symevol.htm   (5619 words)

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