Inflation Definition and 399 Threads

I have a question about inflation. I read that during inflation the speed which is expanding is greater than the speed of light, is that even possible? We know that nothing in the universe is faster than the speed of light.

According to the theory of inflation, at least as I understand it, baby universes pop into existence and are connected to this one by a wormhole. That wormhole then shuts in a split second. Some also say that baby universes can be formed this way in particle accelerators. Is there any way to...

Please apologise to my poor English, and I am the bigginner in this field. I have recently read about The inflation of the universe. It said that The Higgs Particles causes universe expansion with acceleration because of its negative density. Does it mean it has a negative mass or a...

Has it been debunked yet or is it still going strong?

Energy of Photon/Red-shift, inflation, acceleration I have a few questions (following a short premise) below. I have been reading medieval philospohy recently and also some about the "Big Bang." What I am struck by is number of assumptions made in both fields. There is a large amount of...

http://arxiv.org/abs/0709.0002 Searching for Inflation in Simple String Theory Models: An Astrophysical Perspective Mark P. Hertzberg (MIT), Max Tegmark (MIT), Shamit Kachru (Stanford), Jessie Shelton (Rutgers), Onur Ozcan (MIT) 24 pages, 5 figs (Submitted on 3 Sep 2007 (v1), last revised 3 Sep...

I can't understand the condition for inflation that Liddle presents in his book, Cosmological Inflation and Large-Scale Structure A.Liddle, Pg 51: \frac{d}{dt} \frac{H^{-1}}{a} <0 Because \frac{H^{-1}}{a} is the comoving Hubble length, the condition for inflation is that the comoving Hubble...

Without inflation, only extremely special conditions in the past produce the universe we now see. Or so the story goes. Penrose has long argued that conditions necessary for inflation are actually more special that the necessary past conditions without inflation. Its seems that Sean Carroll...

A local garage has big advertizements featuring "free nitrogen inflation of all new tires fitted, as used in Formula I motorsport for the past 20 years". My cynicism assumes this is snake oil so far as normal road tires are concerned - can anybody confirm or deny this? It reminds me of a...

I need a good book on Inflation theory to start studying . Does anyone know a good book written on inflation theory? I really need a book advice...

(We are designing a portable pontoon with inflatable base, however neither of us has much knowledge of inflation systems or fluid mechanics) How can you calculate the internal pressure of an inflated bladder as it gets pushed under the water by the weight it supports? And how this pressure...

Hello! I wanted to ask about the possible inflation era when considering the Big Bang model. Can someone explain me carefully but quite briefly what this inflation was? Thanks :)

I'm trying to learn some theory of inflation, and recently read a paper by Andrei Linde from 1982 where he suggested a scenario where inflation is driven by the phase transition SU(5) -> SU(3) x SU(2) x U(1). Now SU(5) is known to not be a good candidate as an extension of the standard model...

Over in the Relativity forum, in the thread "Metrics and Forces", I have been brought (in fact dragged kicking and screaming, by Pervect) to the following view: In the FRW universe with matter, as gravity slows expansion, compressive tidal stresses develop in any entity that is bound by...

I know that inflation is the rapid acceration of space some time after the big bang, but are there theories that explain what cause inflation to happen?

Tire inflation to determine weight - solved The problem goes as follows: he four tires of an automobile are inflated to a gauge pressure of 1.85E+5 Pa. Each tire has an area of 0.0237 m2 in contact with the ground. Determine the weight of the automobile. But I've applied the Pfluid = F/A...

The newly release WMAP data supports the Inflation model that the universe expanded from subatomic scales to Astronomic scales in a fraction of a second. If so, then what would have been the distance from each point where space would have been expanding at the speed of light, approximately? Thanks.

Here's the idea: As one approaches the event horizon of a black hole, gravity increases, and time slows. The outside universe appears to speed up. The rate of infalling matter increases, which is consumed by the black hole to increase it's mass. The Schwarzschild radius of the black hole...

Hey, I'm doing a discussion/essay for uni on the Inflation proscess during the big bang. I'm not looking for facts/figures, that's what the uni wants me to do:smile: but I'd like to hear a little chat about other peoples views other than reading books. So who thinks its true/false or any better...

The gravity of the orginal singularity would make it a black hole. The original gravity of the universe would give it an escape velocity; the escape velocity of the Big Bang. In order to get the universe over its gravity there was an inflationary epoch that rapidly brought the strength of...

the following problems i have trouble solving, please help: :smile: each member of a random sample of 15 analysts was asked to predict the rate of inflation for the coming year. assume that the predictions for the whole population of analysts follow a normal distribution with the standard...

Might quantum entanglement explain the cosmological constant, isotropy, flatness, magnetic monopole and horizon problems? Instead of inflation introducing a phase change that caused an exponential expansion in the early universe, perhaps entanglement has maintained a statistical causality...

>>I'm trying to create a design for an improved, non-hesitationg pilot-chute, but going back through all my old textbooks I cannot find anything about the physics of inflation (which I understand are complex and chaotic). The only reference materials I've been able to find is a book called...

I am not mathmatician and know little of string theory. But I am looking for God and I hear those of you who do know string theory may be hot on his trail. Years ago, when Hubble was still only a promise we were told it would allow us to see back in time nearly to the big bang. My concern...

I have read a lot about eternal inflation and as I understand it Guth and others are now arguing that once inflation has started, it is an ongoing process. However, my question is, once inflation had finished in one Universe and inflation had started somewhere else, wouldn't the expanding...

I am no financial expert, but I keep hearing talk of inflation. Usually I would not care, but since I plan on taking advantage of the government, I thought I should look into it. So here is the scenario. I will be receiving as much as possible of $17,500 over the next two years in...

Is it known which of the four fundamental forces drives inflation? If this is too stupid a question, feel free to flame me into the stone age. :)

If the hot Big-Bang model is accurate (and seems like it is), could cosmic inflation (maybe a further extension) explain why the universe is accelerating or will we have to retreat to extra-dimensions (superstring theory and leaking gravity)? There are other problems with this theory of...

The fact that the black body distribution of the cosmic microwave background radiation is that of a black body, implies that during recombination the universe was in thermal equilibrium. My question is how this almost perfect thermal equilibrium was reached... During inflation, space was...

G. M. Hossain posted a new Loop cosmology paper today. http://arxiv.org/gr-qc/0411012 Primordial Density Perturbation in Effective Loop Quantum Cosmology It suggests a way of testing LQG cosmology against standard scenarios by looking at details of the CMB power spectrum. A step in the...

As I understand the inflationary cosmology states that at around 10^-35 seconds to 10^-32 seconds after the Big Bang all matter was created as what Alan Guth called the "ultimate free lunch". However, it is said that at 10^-43, the so-called Planck time, was when gravity became separated from...

Papers by a number of authors have shown that Loop Quantum Cosmology removes the big bang singularity. Loop Quantum Cosmology development leads that of the full LQG theory because in cosmology one is essentially quantizing the prevailing (Friedman) cosmological model, which is a deal simpler...

Here is a current paper:http://uk.arxiv.org/abs/hep-th/0406230 the authors can only be described as the 'premier-division' leaders, but the paper seems to be relaying a fundamental shift in Inflationary understandings, and this is having a direct consequence of the vast number of recent...

To calculate the size of the observable universe, one has to calculate the current distance to the particle horizon (t0: today, c = 1): \int_{0}^{t_0} \ dt / a(t) (1) To be able to calculate the integral one has to find an expression for a(t). With some assumptions one can take a(t) =...

Hi, I am trying to understand inflation from a pedagogical perspective and would like to ask if anyone has any lucid insights into the nature of the scalar inflation field and how/why the expansion/supercooling occurs. Any clear explanations extremely appreciated.

What caused inflation in the big bang theory? I've read a few things that seem pure speculation designed to give a cause for something thought to necessarily have happened such as an antigravity force that faded at the end of the inflationary period. It seems too contrived to me.

Just as the thermal equilibrium between two relatively receding (c<v<2c) cosmological horizons is justified by inflation, such a Higgs phase transition could account locally for correlations violating the Bell inequality through superluminal (c<v<2c) "signaling."

What's the best model of inflation? Give me your vote, please My vote goes for hybrid inflation :smile:

Alan Guth and Stephen Hawking on "Eternal Inflation" It is an interesting topic and Alan Guth had two papers discussing it in 2003, also Hawking had one I found in 2003. might be interesting to check out their recent words on the subject Hawking defined it as follows and then proceded to...

How could "Nothingness", before the dawn of the quantum inflation, becoem unstable by the quantum mechanics principal of uncertainty?

Does anyone know if VSL theories are being seriously researched, studied, and pursued? -Glenn

"Quantum Gravity and Inflation"---a new paper The following paper appeared today in arxiv preprints Stephon Alexander et al "Quantum Gravity and Inflation" http://arxiv.org/hep-th/0309045 The paper could be important. By way of detail, it has been submitted to Physical Review Series D...

http://bubba.ucdavis.edu/~infl03/Anthony_Aguirre/infl_infl.pdf" http://arxiv.org/ps/gr-qc/0301042 COMMENT: I tried the links myself, and you can download them using "right-mouse/save as" at the link, and the files (first: PDF, second: PS) will be stored to disk. Note: the PS file...

Here is a good paper that is quite neat makes a good case for evolving extensions to Inflation models. http://arxiv.org/PS_cache/hep-th/pdf/0307/0307179.pdf

Ashtekar "Mathematical Structure of Loop Quantum Cosmology" http://www.arxiv.org/gr-qc/0304074 It's with co-authors Martin Bojowald and Jerzy Lewandowski and the date is June 9, 2003 and its 29 pages with references Ashtekar and company have an ongoing program to quantize the geometry...

when a price of $56.795 is rounded to $56.80 money is created... would you say this has a negligable impact upon our economy?

Leaving for the beach today so I won't be contributing any thoughts but posters named Nacho and Rudi wrote some things recently that started me wondering why (in standard cosmology, not "astro.alt"!) people find inflation scenarios compelling the usual answer is, even tho we don't know...

I've had a nagging question about the nature of inflation of the universe for some time, something that to me seems intuitive but which I've never seen asked or answered. I recognize the danger of intuitive thinking in modern physics, but hopefully some of the experts here can help straighten...

As anlternative to some other pre-Big Bang theories (like the Hawking-Turok Instanton pea model) there is a model of Eternal, Chaotic or Open inflation, in which Inflation reproduces itself eternally. The merit of this model of inflation is that there is no requirement for a "beginning of...