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Archive 1 |
How does one distinguish between a universe whose expansion is accelerating at a flat rate, and a universe whose contraction is accelerating at a flat rate and is faster then the speed of light? If someone can find that information, it should be on this page I think.
When was an "Accelerating Universe" theory first postulated? When was it first expected? Etc. —Preceding unsigned comment added by 71.10.67.171 ( talk) 23:42, 8 August 2010 (UTC)
It seems obvious that the acceleration of our particular Universe is proof positive we live in a Multiverse consisting of matter and antimatter with a total mass of zero caused by unknown factors/distortions within infinite 3D space. Due to the vast distances, relative slowness, and dispersion of photons we are unable to view the other Multiverses (in fact we cannot even see the other side of our own) but that certainly does not mean the other Multiverses (or the other side of our own) do not exist or we also would not exist. Some of the matter being expelled from our Universe (where forces such as Big Bang momentum, dark energy negative pressure, and the weak gravity of other Multiverses overpowers counterforces such as the collective gravity of our own Universe) will eventually go into other Multiverses' upcoming Big Bangs, just as some matter from previous others contributed to our Universe's most recent Big Bang just 14 billion Earth years ago (a virtual nanosecond in infinite time) as part of a perpetual cycle. Theorists should move beyond the age old question of "What created the Universe" as this is passe and dated -- instead they should focus on what factors/distortions trigger the generation of offsetting matter/antimatter regardless of the scale as all else directly follows from that. -- MFPrice1
—Preceding unsigned comment added by MFPrice1 ( talk • contribs) 01:57, 26 January 2009 (UTC)
Hm. This is a bit out of my field, but isn't inflation theory another possible model for the accelerating universe phenomenon? -- April
This is out of my field as well, but if the rate of expansion is constantly accelerating, does this open up the possibility that the universe always existed? I mean, if you reverse time this would mean the universe never shrinks out of existence because the rate of contraction would slow down 69.234.200.38 ( talk)
—Preceding unsigned comment added by 69.234.200.38 ( talk) 03:39, 23 January 2009 (UTC)
Yes, but that's included in non-zero cosmological constant (which presumably caused inflation).
Wrong, sorry. The present non-zero cosmological constant/quintessence can be thought of as a form of inflation, but it probably has no relation to the inflationary scenarios (they are not theories, because they are too vague!). The inflationary scenarios generally talk about inflation when the Universe was about 10^(-33) seconds old, long before the microwave background epoch.
See the special edition of
Scientific American, Volume 12, Number 2
Title: The Once and Future Cosmos
It is readable, detailed, and current.
Randal Leavitt 00:40 Oct 13, 2002 (UTC)
Does anybody know what is the value of the acceleration of Hubble's constant in terms of dH/dt. There is an obscure relativistic effect that partly simulates the accelerated expansion of space. For our universe this simulated part would be of order of 2x10-36/s/s. I wonder how close this theoretical value is to the observed one. If close enough it might mean that the whole acceleration is just an illusion produced by subtleties of Einsteinian gravitation. Jim 20:41, 13 Jul 2004 (UTC)
I think that this article could stand to be... Expanded. Mr. Billion 06:10, 5 Mar 2005 (UTC)
I would like to directed this page to the dark energy article. The only information on this page which isn't in the general review in dark energy is the stuff about zero point and eternal intelligence, which might as well go into the pages that are being referred to. I think pages like ultimate fate of the universe, cosmological constant or quintessence (physics) could be useful as independent pages, but I can't really see anything going in here that wouldn't belong either in dark energy or a more specialized page on cosmology with Type Ia supernovae. -- Joke137 18:11, 7 Mar 2005 (UTC)
As a layman i have to ask what is negative pressure? Does it have anything to do with gravitational repulsive material? -- Orionix 00:56, 10 Mar 2005 (UTC)
A recently-verified fact that is often ignored is that the universe was deccelerating by gravitational attraction up until about 5 billion years ago. This was preceded, in theory, by a period of rapid expansion called 'inflation', and followed by the current acceleration caused by the 'funny energy' in space. Thus the expansion of the universe goes through three radically different epochs: 1. A fraction of a second of rapid acceleration immediately after the Big Bang. This inflation is the small epoch of expansion that lasted from 10^-43 seconds to 10^-35 seconds after the Big Bang, and caused space to expand faster than the speed of light, 2. A period of about 10 billion years of decceleration by gravitational attraction before matter was dilute enough to be dominated by the antigravitational effect of the 'dark energy', 3. The current epoch of about 5 billion years in which 'dark energy' rules over gravitational attraction. In this third period, the 'dark energy' creates an outward push called 'negative pressure' much like the air in blowing up a balloon. See my book http://empyreanquest.com/science/cr/cosmrep.htm Cosmic Acceleration: Hounding The White Whale of Cosmology free online. Philip Petersen, PhD
Arrogantly, (since I have no training in this field) I say that even if there was not a big bang, space would still be here. Space is', just as God is', and in my opinion space was not created by a big bang but merely the "field" in which the bang banged. The cosmologiocal constant and space and God and ether was and always will be there or.......HERE.
Certainly there would be no galaxies or visible creation without a bang, but space would still exist. The exasperating question arises of : "Well, if there was nothing to experience or exist in space and no one to experience it, how do we know space was there prior to the bang? It would be impossible to measure space without any contents but space would still exist, MERELY AS SUBJECT, SINCE NO OTHER SUBJECT WOULD BE THERE TO SEE IT AS AN OBJECT. This question is a paralell to the other very silly question of "if a tree falls in the woods and no-one hears it?... did it make a sound?" ...and... the even sillier postulated answer given by the so-called "wise and educated" of "No, it did not". How absurdly preposterous by anyone posessing of common sense! Although it made no resonation in the ear of the dummy who provided the ill-accepted answer ... I am sure it made a sound in the ear of the innocent and simple-minded, little woodpecker who made his nest there.
In fact, space, being infinite, is not measurable... by the very definition, only opne object to another. But space is not an object. It is merely subject. Singularity, (since we are in need of a word to represent the time before a 3-D creation and the condition within a black hole) was the existence at that time before the big bang, YES...but space was already here and space has to be infinite in all directions. Obviously, the reason is this: If there was a boundary to space...then what is beyond the boundary? And...any boundary that may be there would be permeated with the cosmological constant AND/OR ether, being one in the same.
I correlate all this cosmology with my own finite understanding of an infinite being...i.e. God. Not the jealous God of the Bible but that Omniscient, Omnipresent and Omnipotent God. Ether, or the cosmological constant is "His" very body and/or mind and what we percieve is "His" thoughts/creations from "His" infinite mind which creates merely from thinking it (whatever it is) into being... and it is done immediately. His omnipresence is apparent in the fact of the cosmological constant which is everywhere, not only between objects in space but within and outside the creation as well.
When I was young, that term was "ether"... not ether like what is sniffed to wake up the unconcious but ether as in that ungraspable thing that is in everything but not contained by it. Ether is the mind or body of God in which all things exist.
I never hear the term "ether" used any more. I do not know why not. It is much easier to say than cosmological constant and therefor comprehension easier.
Instinctively yours.
66.56.17.250 21:32, 3 March 2007 (UTC)
There should probably be a mention of other theories, such as ones that say the acceleration is an illusion. I've heard at least one which was corroborated by data, something about our solar system being located in an area of low density of matter which causes light to redshift. Cannot cite source. In my layman's opinion, which is governed by common sense rather than infinitely complex math, the illusion theory involving differential densities makes alot more sense. But as I say, I'm no physicist.
Also, let's keep religion out of discussions on physics unless we're talking about metaphysics. (Directed at 66.56.17.250 above) 69.90.51.160 ( talk) 06:48, 31 March 2009 (UTC)
Clearly the article is misleading where it begins by claiming acceleration is an observation. The actual observation is the higher-than-expected red shift of extremely distant supernovae. The so-called corroborating observations do not corroborate acceleration; they only corroborate the presence (in the early universe, at least) of much more mass (energy) than is accounted for by non-homogeneous dark matter; that extra mass/energy isn't necessarily repulsive. Acceleration is merely one theoretical explanation of the high red shift, and since acceleration is rather remarkable and unexpected--implying a counter-intuitive repulsive force--there may be better explanations. The article ought to describe acceleration as a theoretical explanation, not an observation, and should delve into why other explanations are considered unsatisfactory. The acceleration theory is on shakier ground than the big bang theory that explains the ordinary Hubble red shift. Also, since the extremely distant supernovae emitted the light a very long time ago, perhaps the acceleration (or whatever is the cause of the high red shift) was a property of the early universe and only occurred a long time ago, maybe an effect of inflation. SEppley ( talk) 18:02, 10 April 2011 (UTC)
I skimmed the catalog cited by citation 46 of the Redshift article, which catalogs articles containing alternative explanations of the red shift. The catalog, published in 1981, doesn't list the articles' content beyond their titles, unfortunately. None of the titles appears to mention the notion that the red shift might be explainable by a changing rate of the passage of time. Both special and general relativity describe how time passes at different rates due to velocity or gravity, so this notion doesn't seem a priori nonsensical. Has this possibility been ruled out? Is it equivalent to expansion of space since space & time together comprise spacetime, or would some consequences be different? SEppley ( talk) 16:06, 29 October 2011 (UTC) a — Preceding unsigned comment added by ES DFG Yebra ( talk • contribs) 18:05, 27 August 2013 (UTC)
May DDHB theory be consider a suitable alternative for Accelerating Expansion of the Universe? The thesis is the following: The accelerated expansion of the universe is caused by a Decreasing Density of the Higgs Boson (DDHB) across the known universe. Probably radial. Consequently, the very same element in different parts of the universe would have different mass. Particles that would typically interact with the Higgs Boson would not do it in certain parts of the universe. Simply because there are not so many Boson Higgs particles to interact with. Thus having less mass, thus accelerating more and more as they move into areas with less density of Higgs Boson particles.
— User talk:ES DFG Yebra 27th /Aug /2013
I do not understand why gravitational lensing would show how the universe is expanding... Can anyone give me some clarification on that? Marx01 Tell me about it 06:01, 7 August 2009 (UTC)
I've removed everything that could be interpreted as original research. The remaining text is copied from the cited New Scientist articles. Those articles contain references to peer reviewed publications.-- Systemizer ( talk) 18:11, 12 September 2009 (UTC)
{Undent} This is the pre-loaded debate from McSly's talk page. Simonm223 ( talk) 20:47, 14 September 2009 (UTC)
The information held at the boundary is not smooth, but composed of "bits", each one occupying an area that corresponds to the most fundamental quanta of distance in the universe. This is the Planck length, around 10-35 metres – far too small for us to see the individual bits. When this information is projected into the volume of the universe, however, each bit gets magnified. That means we might just be able to see pixellation in space-time
in reference to Craig Hogan's hypothesis but, as you can see, fundamental changes were made by Systemizer with regards to the subject of the text. Furthermore both articles made it clear that while the holographic principle has been a useful contribution to superstring theory it is still, ultimately, unproven at this time, especially when applied to the cosmological boundary rather than the boundaries of black holes. Simonm223 ( talk) 11:58, 15 September 2009 (UTC)
" the expansion of the universe is accelerating[1][2] since around redshift of z~0.5[3]." I've been studying astronomy my whole life and can't understand what that last part means. It'd be great to find out what redshift and z mean later in the article ... but that needs to be translated into something the average reader can understand at that point. Twang ( talk) 10:54, 26 November 2009 (UTC)
The evidence of the acceleration of the expansion of the Universe was established based on the observation of supernovae (Riess, 1998). By plotting the distance moduls M-m againt redshifts in log scale, the non-linearity of the plot was interpreted as an acceleration of the expansion of the Universe. However, due to the effect of the Planck's law for the energy of the photon (E = hc/lambda), the observed energy flux is reduced due to redshifts. By taking in to account this effect, the corrected distance modulus becomes: m-M = -5 + 5log(d) + 2.5 log(1+z). Therefore, one should plot the redshift adjusted distance modulus m-M -2.5log(1+z) against redshifts in log scale, and the plot becomes linear. Therefore, we cannot conclude anymore that the expansion of the Universe is accelerating. Ref: http://www.ptep-online.com/index_files/2012/PP-28-02.PDF. — Preceding unsigned comment added by 92.107.15.227 ( talk) 20:11, 15 August 2011 (UTC)
Does this mean the entire Universe is in an accelerated frame of reference? Patsobest ( talk) 00:46, 31 August 2012 (UTC)
Is it possible that the universe expands at an accelerated rate for a while and then the rate comes down and this goes on in a cyclical manner? — Preceding unsigned comment added by Ksunilsingh ( talk • contribs) 01:15, 10 October 2012 (UTC)
This article suks balls. I educated myself at hyperphysics, and the gist of it is current velocity + magnitude of the supernova shows acceleration, but there is no hint of this on the page. 70.176.28.195 ( talk) 07:13, 8 June 2013 (UTC)
Been thinking it over: the universe is shrinking or we are moving to some other point which attracts us. The fact that all galaxies seem to move away can be explained in another way. Imagine being in our galaxy. We are moving in a direction, say left. If we are moving to a point far in front of us and all galaxies are, then gravety moves the galaxies in front of us faster and further away (redshift), galaxies behind us seem to move faster away as well, because our relative speed increases (redshift). Galaxies near us come closer (blueshift). Now the question is: if the big bang is true, than the universe is either shrinking, or are we moving to another point, maybe a black hole, which attracts our galaxy and others moving in the same direction at increasing speed. Could this be true??? René Janssen60 ( talk) 14:25, 10 July 2013 (UTC) René Janssen60 ( talk) 18:13, 10 July 2013 (UTC)
![]() | This is an archive of past discussions. Do not edit the contents of this page. If you wish to start a new discussion or revive an old one, please do so on the current talk page. |
Archive 1 |
How does one distinguish between a universe whose expansion is accelerating at a flat rate, and a universe whose contraction is accelerating at a flat rate and is faster then the speed of light? If someone can find that information, it should be on this page I think.
When was an "Accelerating Universe" theory first postulated? When was it first expected? Etc. —Preceding unsigned comment added by 71.10.67.171 ( talk) 23:42, 8 August 2010 (UTC)
It seems obvious that the acceleration of our particular Universe is proof positive we live in a Multiverse consisting of matter and antimatter with a total mass of zero caused by unknown factors/distortions within infinite 3D space. Due to the vast distances, relative slowness, and dispersion of photons we are unable to view the other Multiverses (in fact we cannot even see the other side of our own) but that certainly does not mean the other Multiverses (or the other side of our own) do not exist or we also would not exist. Some of the matter being expelled from our Universe (where forces such as Big Bang momentum, dark energy negative pressure, and the weak gravity of other Multiverses overpowers counterforces such as the collective gravity of our own Universe) will eventually go into other Multiverses' upcoming Big Bangs, just as some matter from previous others contributed to our Universe's most recent Big Bang just 14 billion Earth years ago (a virtual nanosecond in infinite time) as part of a perpetual cycle. Theorists should move beyond the age old question of "What created the Universe" as this is passe and dated -- instead they should focus on what factors/distortions trigger the generation of offsetting matter/antimatter regardless of the scale as all else directly follows from that. -- MFPrice1
—Preceding unsigned comment added by MFPrice1 ( talk • contribs) 01:57, 26 January 2009 (UTC)
Hm. This is a bit out of my field, but isn't inflation theory another possible model for the accelerating universe phenomenon? -- April
This is out of my field as well, but if the rate of expansion is constantly accelerating, does this open up the possibility that the universe always existed? I mean, if you reverse time this would mean the universe never shrinks out of existence because the rate of contraction would slow down 69.234.200.38 ( talk)
—Preceding unsigned comment added by 69.234.200.38 ( talk) 03:39, 23 January 2009 (UTC)
Yes, but that's included in non-zero cosmological constant (which presumably caused inflation).
Wrong, sorry. The present non-zero cosmological constant/quintessence can be thought of as a form of inflation, but it probably has no relation to the inflationary scenarios (they are not theories, because they are too vague!). The inflationary scenarios generally talk about inflation when the Universe was about 10^(-33) seconds old, long before the microwave background epoch.
See the special edition of
Scientific American, Volume 12, Number 2
Title: The Once and Future Cosmos
It is readable, detailed, and current.
Randal Leavitt 00:40 Oct 13, 2002 (UTC)
Does anybody know what is the value of the acceleration of Hubble's constant in terms of dH/dt. There is an obscure relativistic effect that partly simulates the accelerated expansion of space. For our universe this simulated part would be of order of 2x10-36/s/s. I wonder how close this theoretical value is to the observed one. If close enough it might mean that the whole acceleration is just an illusion produced by subtleties of Einsteinian gravitation. Jim 20:41, 13 Jul 2004 (UTC)
I think that this article could stand to be... Expanded. Mr. Billion 06:10, 5 Mar 2005 (UTC)
I would like to directed this page to the dark energy article. The only information on this page which isn't in the general review in dark energy is the stuff about zero point and eternal intelligence, which might as well go into the pages that are being referred to. I think pages like ultimate fate of the universe, cosmological constant or quintessence (physics) could be useful as independent pages, but I can't really see anything going in here that wouldn't belong either in dark energy or a more specialized page on cosmology with Type Ia supernovae. -- Joke137 18:11, 7 Mar 2005 (UTC)
As a layman i have to ask what is negative pressure? Does it have anything to do with gravitational repulsive material? -- Orionix 00:56, 10 Mar 2005 (UTC)
A recently-verified fact that is often ignored is that the universe was deccelerating by gravitational attraction up until about 5 billion years ago. This was preceded, in theory, by a period of rapid expansion called 'inflation', and followed by the current acceleration caused by the 'funny energy' in space. Thus the expansion of the universe goes through three radically different epochs: 1. A fraction of a second of rapid acceleration immediately after the Big Bang. This inflation is the small epoch of expansion that lasted from 10^-43 seconds to 10^-35 seconds after the Big Bang, and caused space to expand faster than the speed of light, 2. A period of about 10 billion years of decceleration by gravitational attraction before matter was dilute enough to be dominated by the antigravitational effect of the 'dark energy', 3. The current epoch of about 5 billion years in which 'dark energy' rules over gravitational attraction. In this third period, the 'dark energy' creates an outward push called 'negative pressure' much like the air in blowing up a balloon. See my book http://empyreanquest.com/science/cr/cosmrep.htm Cosmic Acceleration: Hounding The White Whale of Cosmology free online. Philip Petersen, PhD
Arrogantly, (since I have no training in this field) I say that even if there was not a big bang, space would still be here. Space is', just as God is', and in my opinion space was not created by a big bang but merely the "field" in which the bang banged. The cosmologiocal constant and space and God and ether was and always will be there or.......HERE.
Certainly there would be no galaxies or visible creation without a bang, but space would still exist. The exasperating question arises of : "Well, if there was nothing to experience or exist in space and no one to experience it, how do we know space was there prior to the bang? It would be impossible to measure space without any contents but space would still exist, MERELY AS SUBJECT, SINCE NO OTHER SUBJECT WOULD BE THERE TO SEE IT AS AN OBJECT. This question is a paralell to the other very silly question of "if a tree falls in the woods and no-one hears it?... did it make a sound?" ...and... the even sillier postulated answer given by the so-called "wise and educated" of "No, it did not". How absurdly preposterous by anyone posessing of common sense! Although it made no resonation in the ear of the dummy who provided the ill-accepted answer ... I am sure it made a sound in the ear of the innocent and simple-minded, little woodpecker who made his nest there.
In fact, space, being infinite, is not measurable... by the very definition, only opne object to another. But space is not an object. It is merely subject. Singularity, (since we are in need of a word to represent the time before a 3-D creation and the condition within a black hole) was the existence at that time before the big bang, YES...but space was already here and space has to be infinite in all directions. Obviously, the reason is this: If there was a boundary to space...then what is beyond the boundary? And...any boundary that may be there would be permeated with the cosmological constant AND/OR ether, being one in the same.
I correlate all this cosmology with my own finite understanding of an infinite being...i.e. God. Not the jealous God of the Bible but that Omniscient, Omnipresent and Omnipotent God. Ether, or the cosmological constant is "His" very body and/or mind and what we percieve is "His" thoughts/creations from "His" infinite mind which creates merely from thinking it (whatever it is) into being... and it is done immediately. His omnipresence is apparent in the fact of the cosmological constant which is everywhere, not only between objects in space but within and outside the creation as well.
When I was young, that term was "ether"... not ether like what is sniffed to wake up the unconcious but ether as in that ungraspable thing that is in everything but not contained by it. Ether is the mind or body of God in which all things exist.
I never hear the term "ether" used any more. I do not know why not. It is much easier to say than cosmological constant and therefor comprehension easier.
Instinctively yours.
66.56.17.250 21:32, 3 March 2007 (UTC)
There should probably be a mention of other theories, such as ones that say the acceleration is an illusion. I've heard at least one which was corroborated by data, something about our solar system being located in an area of low density of matter which causes light to redshift. Cannot cite source. In my layman's opinion, which is governed by common sense rather than infinitely complex math, the illusion theory involving differential densities makes alot more sense. But as I say, I'm no physicist.
Also, let's keep religion out of discussions on physics unless we're talking about metaphysics. (Directed at 66.56.17.250 above) 69.90.51.160 ( talk) 06:48, 31 March 2009 (UTC)
Clearly the article is misleading where it begins by claiming acceleration is an observation. The actual observation is the higher-than-expected red shift of extremely distant supernovae. The so-called corroborating observations do not corroborate acceleration; they only corroborate the presence (in the early universe, at least) of much more mass (energy) than is accounted for by non-homogeneous dark matter; that extra mass/energy isn't necessarily repulsive. Acceleration is merely one theoretical explanation of the high red shift, and since acceleration is rather remarkable and unexpected--implying a counter-intuitive repulsive force--there may be better explanations. The article ought to describe acceleration as a theoretical explanation, not an observation, and should delve into why other explanations are considered unsatisfactory. The acceleration theory is on shakier ground than the big bang theory that explains the ordinary Hubble red shift. Also, since the extremely distant supernovae emitted the light a very long time ago, perhaps the acceleration (or whatever is the cause of the high red shift) was a property of the early universe and only occurred a long time ago, maybe an effect of inflation. SEppley ( talk) 18:02, 10 April 2011 (UTC)
I skimmed the catalog cited by citation 46 of the Redshift article, which catalogs articles containing alternative explanations of the red shift. The catalog, published in 1981, doesn't list the articles' content beyond their titles, unfortunately. None of the titles appears to mention the notion that the red shift might be explainable by a changing rate of the passage of time. Both special and general relativity describe how time passes at different rates due to velocity or gravity, so this notion doesn't seem a priori nonsensical. Has this possibility been ruled out? Is it equivalent to expansion of space since space & time together comprise spacetime, or would some consequences be different? SEppley ( talk) 16:06, 29 October 2011 (UTC) a — Preceding unsigned comment added by ES DFG Yebra ( talk • contribs) 18:05, 27 August 2013 (UTC)
May DDHB theory be consider a suitable alternative for Accelerating Expansion of the Universe? The thesis is the following: The accelerated expansion of the universe is caused by a Decreasing Density of the Higgs Boson (DDHB) across the known universe. Probably radial. Consequently, the very same element in different parts of the universe would have different mass. Particles that would typically interact with the Higgs Boson would not do it in certain parts of the universe. Simply because there are not so many Boson Higgs particles to interact with. Thus having less mass, thus accelerating more and more as they move into areas with less density of Higgs Boson particles.
— User talk:ES DFG Yebra 27th /Aug /2013
I do not understand why gravitational lensing would show how the universe is expanding... Can anyone give me some clarification on that? Marx01 Tell me about it 06:01, 7 August 2009 (UTC)
I've removed everything that could be interpreted as original research. The remaining text is copied from the cited New Scientist articles. Those articles contain references to peer reviewed publications.-- Systemizer ( talk) 18:11, 12 September 2009 (UTC)
{Undent} This is the pre-loaded debate from McSly's talk page. Simonm223 ( talk) 20:47, 14 September 2009 (UTC)
The information held at the boundary is not smooth, but composed of "bits", each one occupying an area that corresponds to the most fundamental quanta of distance in the universe. This is the Planck length, around 10-35 metres – far too small for us to see the individual bits. When this information is projected into the volume of the universe, however, each bit gets magnified. That means we might just be able to see pixellation in space-time
in reference to Craig Hogan's hypothesis but, as you can see, fundamental changes were made by Systemizer with regards to the subject of the text. Furthermore both articles made it clear that while the holographic principle has been a useful contribution to superstring theory it is still, ultimately, unproven at this time, especially when applied to the cosmological boundary rather than the boundaries of black holes. Simonm223 ( talk) 11:58, 15 September 2009 (UTC)
" the expansion of the universe is accelerating[1][2] since around redshift of z~0.5[3]." I've been studying astronomy my whole life and can't understand what that last part means. It'd be great to find out what redshift and z mean later in the article ... but that needs to be translated into something the average reader can understand at that point. Twang ( talk) 10:54, 26 November 2009 (UTC)
The evidence of the acceleration of the expansion of the Universe was established based on the observation of supernovae (Riess, 1998). By plotting the distance moduls M-m againt redshifts in log scale, the non-linearity of the plot was interpreted as an acceleration of the expansion of the Universe. However, due to the effect of the Planck's law for the energy of the photon (E = hc/lambda), the observed energy flux is reduced due to redshifts. By taking in to account this effect, the corrected distance modulus becomes: m-M = -5 + 5log(d) + 2.5 log(1+z). Therefore, one should plot the redshift adjusted distance modulus m-M -2.5log(1+z) against redshifts in log scale, and the plot becomes linear. Therefore, we cannot conclude anymore that the expansion of the Universe is accelerating. Ref: http://www.ptep-online.com/index_files/2012/PP-28-02.PDF. — Preceding unsigned comment added by 92.107.15.227 ( talk) 20:11, 15 August 2011 (UTC)
Does this mean the entire Universe is in an accelerated frame of reference? Patsobest ( talk) 00:46, 31 August 2012 (UTC)
Is it possible that the universe expands at an accelerated rate for a while and then the rate comes down and this goes on in a cyclical manner? — Preceding unsigned comment added by Ksunilsingh ( talk • contribs) 01:15, 10 October 2012 (UTC)
This article suks balls. I educated myself at hyperphysics, and the gist of it is current velocity + magnitude of the supernova shows acceleration, but there is no hint of this on the page. 70.176.28.195 ( talk) 07:13, 8 June 2013 (UTC)
Been thinking it over: the universe is shrinking or we are moving to some other point which attracts us. The fact that all galaxies seem to move away can be explained in another way. Imagine being in our galaxy. We are moving in a direction, say left. If we are moving to a point far in front of us and all galaxies are, then gravety moves the galaxies in front of us faster and further away (redshift), galaxies behind us seem to move faster away as well, because our relative speed increases (redshift). Galaxies near us come closer (blueshift). Now the question is: if the big bang is true, than the universe is either shrinking, or are we moving to another point, maybe a black hole, which attracts our galaxy and others moving in the same direction at increasing speed. Could this be true??? René Janssen60 ( talk) 14:25, 10 July 2013 (UTC) René Janssen60 ( talk) 18:13, 10 July 2013 (UTC)