Is Dark Energy Getting Stronger?

PBS Space Time
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The power of Dark Energy may be increasing as the universe ages. Subtle clues are emerging that the accepted model for the nature of dark energy and dark matter may not be all that. We saw the first such clue recently in our recent episode on the Crisis in Cosmology. Today we’re doing a Space Time Journal Club to reveal another clue. We’re looking at a new paper in Nature Astronomy, “Cosmological constraints from the Hubble diagram of quasars at high redshifts” by Risaliti and Lusso. It hints that the cosmological constant may not be so constant after all. In fact it may be increasing. If this is true, then our prediction for the future of our universe looks VERY different, and may involve the entire universe tearing itself to shreds at the subatomic level in the Big Rip.
On this edition of Space Time Journal Club we look at:
Risaliti & Lusso (2019) "Cosmological Constraints from the Hubble Diagram of Quasars at High Redshifts"
#darkenergy #darkmatter #spacetime
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سلطان الخليفي



20 бер 2019

SpaceOuter SpacePhysicsAstrophysicsQuantum MechanicsSpace PhysicsPBSSpace TimeTimePBS Space TimeMatt O’DowdAstrobiologyEinsteinEinsteinian PhysicsGeneral RelativitySpecial RelativityDark EnergyDark MatterBlack HolesThe Universe





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Kenny Carter
Kenny Carter 7 днів тому
Id prefer a big rip over big freeze, thats just me through
Naum Rusomarov
Naum Rusomarov 11 днів тому
Interesting paper, but I don't quite buy the averaged out values of z-M. The error bars are pretty huge of the measurements themselves and the difference between the currently accepted Lambda=Const. model and the empirically derived Lambda seems within 2Sigma of each point. It'd be really nice to see similar analysis based on much better data. p.s. Thanks for the videos. Great stuff.
Ethan Franzen
Ethan Franzen 11 днів тому
How do you explain the Big Bang with a constant Λ, anyways? Was Λ gigantic enough at the Big Bang to rip quarks apart? Is Λ just a dial on God's controller that can be changed, freely or is it programmed to evolve to keep the universe flat? Does an empty vacuum with nothing in it evolve over time, when dark energy is considered? Even in a flat universe, couldn't parts be hyperbolic and some hyperspherical? Could enough black holes in one spot close part of an otherwise flat universe off, making a hypersphere? How would that work or would this be the definition of inside an event horizon?!?!!
KirchDub L
KirchDub L 19 днів тому
We know objects close to black holes are experiencing tidal forces which as result torn apart this object. This effect getting stronger and stronger as body is getting closer and closer to the black hole. Now let's assume this body is our universe falling into gigantic black hole which is outside of our observable universe and of the size many many times of our universe (million times). From our perspective we will see our universe (body) experiencing Big Rip and this effect is getting bigger and bigger with time
jake hensley
jake hensley 20 днів тому
maybe our universe is just in a transition of phase, similar to liquid to gas.
Zach C
Zach C 23 дні тому
I believe speed is relative. If we knew more about dark matter I would be able to finish my equation
Jainal Abdin
Jainal Abdin 23 дні тому
Has any theory considered the Universe as having poles? What I mean by this is something like the North and South poles of a planet but on a universal scale. Consider each universal pole to be analogous to a black hole and a white hole, where we see a rapid expansion from the 'big bang' as the white hole pole, and the distant observable universe accelerating away from us into a distant 'big crunch' as the black hole pole. A gigantic structure that spans beyond our observable universe, but we only see a local phenomenon of the observable universe expanding away from us and we try to explain this with Dark Energy?
James Collins
James Collins 24 дні тому
Please Matt, stop saying brightness when you mean luminosity.
James Collins
James Collins 11 днів тому
@The Real Slim Brady, actually that is not true. The terms have two different meanings. They are related to each other. but they have different purposes. You most likely will refuse to believe me so watch David Butler; he will explain it with more authority.
The Real Slim Brady
The Real Slim Brady 11 днів тому
same difference
gary schraa
gary schraa 28 днів тому
Dark energy is that which keeps space from being sticky . It's a lubricant or surfactant . Of course I cant prove this as I am not a scientist , I am a bone head ______ not a melon head
Stan TheObserver
Stan TheObserver Місяць тому
Can or will dark energy rip itself to nothingness one day?
HolyWrath Місяць тому
I believe dark matter is ocilating.
jackay k
jackay k Місяць тому
Dark matter and dark energy are real but it's for heaven or maybe earth also not for humans may be it's like flesh of heaven but it's also exist in earth another form or face or colour if it passes by you you feel massless Ness vaccum nausea in your mind that's what we know as a Muslim but I won't tell the full truth to call me mad religion dog .but it's not hand of god or any any type of part of god .
Faizan Shaikh
Faizan Shaikh Місяць тому
I woke up. I watch new video and I start my day
Kevin McMahon
Kevin McMahon Місяць тому
It is strange that Space-Time is expanding in the space between the Galaxies, but not the space within the atom. Are gravity wells the least likely place to find Dark Energy and Dark Matter?
Adam Watts
Adam Watts Місяць тому
I love how well you brought an academic journal article into means that most layman like myself with just a general interest in physics and cosmology can understand! Thank you. please do some more!
N L Місяць тому
There's a lot we don't understand, but it's pretty clear that dark energy is not a constant. It doesn't mean it will increase forever though.
Christian Anderson
Christian Anderson Місяць тому
What we see in the visible observable universe is what they was millions and billions of years ago at this current time now everything must be gone anything that is 500 million light years or more away think about it if light took a half a billion years to get here or 100 billions light years away those objects no longer exist in theory maybe that's why we see the expansion of the universe speeding up we could be in a totally empty cold universe where the light we see from so far away those objects in are currently space time no longer exist in theory
viod vue
viod vue Місяць тому
"The great courses plus" Plus what?
Charles Rockafellor
Charles Rockafellor Місяць тому
The material is good material, the presentation is professional and concise... but while the words are dead-on, the cadence and body language argue from rhetoric. PBS Space Time always _feels_ like a snake oil sales pitch, even given the otherwise accurate data. :-(
Motesoul Місяць тому
10:30 ZIPF
jhwheuer Місяць тому
So in other words... if something changes the light of the standard candles unexpectedly, all our measurements are off...
Dobby Dazzler
Dobby Dazzler Місяць тому
Always awesome, always inspiring. Thanks SpaceTime xxx
Glenn Babić
Glenn Babić 2 місяці тому
Those two Nobel winning teams that 'wrote the text book on dark energy' (as you put it) in the early 90s, overlooked the most ubiquitous cosmological quality, neglecting to include it in their calculations, which would have shown that universal expansion was SLOWING not increasing. Yes now everyone takes their findings as Gospel. What a cosmological cock up!
// nostromov
// nostromov 2 місяці тому
Yeah, ok, but, it's "supernovaS" ukvid.net/video/%D0%B2%D1%96%D0%B4%D0%B5%D0%BE-tAtVgHvt05M.html
Mr Mellon
Mr Mellon 2 місяці тому
I wonder if space isn't expanding, but "falling" outwards. Local gravity may have slowed the falling rate early but just like gravity from matter, spacetime is falling like the center of gravity is just outward. I wonder if that could be calculated
mastrtonberry2 2 місяці тому
I like all the Star Trek SFX
David Fuller
David Fuller 2 місяці тому
Shamanistic Witch Doctor of Physics Jargon
Accutronitis The 2nd
Accutronitis The 2nd 2 місяці тому
This channel never fails to expand my knowledge of our universe!
Matt Woodruff
Matt Woodruff 2 місяці тому
You guys have great content but a terrible intro song. You need something more pumped up and melodic.
ijams sum
ijams sum 2 місяці тому
They make incorrect assumptions looking back thru time 14-15 billion years ago matter and the laws of physics operated the same as now with no dilation ? Looking back at the early universe it should be expanding fast from the big bang and slowed down later by gravitational forces of mass when gravity was established ! There is no dark matter energy only the universe before physical laws were fully established and what they see happening back then is not the laws today, change set in over some time ! The early universe had little matter to absorb the great energy from the beginning , later the mass assumed physical laws of attraction and absorbed the energy to slow down the Galaxies enough to be stable ! What they are seeing is not even happening today , its 15 billion years ago ! No intuition in science is used only cold incorrect math lacking all the laws of the universe ! Only some laws are known , we are infants at cosmology as intuition has been left behind and no insight is used in science academia in cosmology today and they are more lost than they ever hoped to be lol ! Corona Fusion is the correct theory of our Sun not core fusion and the data is right in front of them but they are blinded by a failed theory to protect science academia from being very wrong from the start ? Cosmology is a farce in many areas and it takes genius to invent a invisible energy dark matter to explain away there failings because you cannot disprove the invisible ! See how science academia works , so now they say it takes 40,000 years for photons at our Suns core to reach the surface of the Sun to explain away the very low surface temperature on the Sun ???? Genius to invent a theory to protect your failed theory so the public cannot see the mistaken theories in our textbooks ? Once you wake up and see the truth you see how little we know and how what has been portrayed as fact is false science and still in textbooks ! No morals allowed because science must be protected from itself by inventing theories that cannot be disproved ! Dark Matter is just such a invention , because they are lost without a clue of intuition ? Dimensional travel and traveling past the speed of light is possible , but you must create a field around a craft the blocks subatomic entanglement that lets the craft have zero mass in our space dimension and blocking our physical laws is all it takes but few people can even think this is possible ? Once you see a UFO your mind opens up very much , and the reality sets in we are to be deceived completely from the truth as science has zero morals !
Chad Davis
Chad Davis 2 місяці тому
I think that there could be a possible error in the interpretation of the redshift increase from the quasar measurement, the dark energy being observed getting stronger around using these quasars could be the black hole expanding space by condensing energy to negative energy. There must be a way to measure this dark energy increase in relation to a few relative nearby black holes to one another and the red shift observed between there varying masses and amount of matter being consumed via the size of its accretion disc, assuming that something will be observed by this would give us an approximation of how much new space/dark energy is being created from the amount energy being converted in s black hole
Nicholas Pdx
Nicholas Pdx 2 місяці тому
How are you accessing my phone? I see you too..
TGK_Llama YT
TGK_Llama YT 2 місяці тому
This is the time that we need Thanos to get on the good sid
Trev Ashton
Trev Ashton 2 місяці тому
Out of curiosity, Has dark matter been found in galaxies that DONT have super massive black holes?
Philip Moran
Philip Moran 2 місяці тому
Gravity can be explained if everything expanded by 1/1000th per second!
Kane Morison
Kane Morison 2 місяці тому
Dark Energy maybe from the collapse of the first big 3 stars into black holes theses black holes having eaten all the local matter around. Collapse explode fragment into pockets of collapsing Matter Dark Energy just a guess way off
vivalafiaga 3 місяці тому
What if the entire universe is simply descending into an unimaginably huge black hole?
Bangla Desh
Bangla Desh 3 місяці тому
"Dark energy" is just the positive curvature of spacetime in the absence of mass on large scales directly proportionate to the density of mass on galactic scales. It's kind of counter intuitive but I've done all the calculations and wrote 2 papers on it, but 6 journals have refused to publish my work as they're invested in other theories. True story.
Matlockization 3 місяці тому
Dark energy is not getting stronger but darker !
Derrick Bommarito
Derrick Bommarito 3 місяці тому
What would the universe look like (besides very dark) to the last remaining animals when a big rip changes the universe enough to become observable? What new chemistry might result that becomes dominant over what I would expect to be a very long period of slow atomic tearing? Does the big rip result in everything inevitably turning itself into WonkaVision static?
Brett Augustine
Brett Augustine 3 місяці тому
Is that a cockmonaut on your shirt?
GIJosh 3 місяці тому
Next April 1st, they need to make a video that asks a question, and answers with "yes" or "no", then end the video.
Waizwaid Arenosa
Waizwaid Arenosa 3 місяці тому
I love this guy; I don't believe he is human; he is too advanced. Nevertheless, I love him. I can listen to him forever.
Cerberus 3 місяці тому
I think Entropy is definitely getting stronger.
Arun Sasi
Arun Sasi 3 місяці тому
Very hypothetical question! Assuming lambda is not uniform across space, will relative expansion of space have relativistic effects on each other?
Harry ToyShirt
Harry ToyShirt 3 місяці тому
So much for "dahk" energy. Someone send a boatload of R's to the Brits.
nope sorry
nope sorry 3 місяці тому
spacetime tearing itself to shreds on the subatomic level... well that certainly would be a big R.I.P
Gabrielle Grandcamp
Gabrielle Grandcamp 3 місяці тому
WHAT IF there was no dark energy at all, like the gravitation isn't a force but more like a propriety of the structure of the space time universe, I'm wondering, what if what we call dark energy is in fact the response of the space time fabric to gravity, like if I put a finger on a baloon, if i press hard, outside this zone of the pressure caused by my finger, the balloon is expanding, so maybe, the expansion is accelerating because there are nothing to stop this expansion, unlike the balloon. So the filaments of galaxies is in fact valleys in a 3d space, caused by the mass of the galaxies themselves, galaxies "squeezed" by monts of void (or less dense universe) created in consequence of their mass pushing on the space time fabric, like fingers on a balloon ? (sorry I'm french, I hope I'm a bit comprehensible) and it's like an answer of the period the universe didn't expand, the space was not enough big to permit the creation of valleys caused by gravity and maybe, maybe, the acceleration of the expansion is caused by what black holes do in the space time fabric, an expansion fuelled by the infinite mass in the center of the black holes ?
Dom Trussardi
Dom Trussardi 3 місяці тому
If there was a "NIgga...the hell you talkin bout?" meme, this guy would show up in half of them.
Jordan Bayless
Jordan Bayless 3 місяці тому
Any energy has quantitative and qualitative characteristics. Stronger or weaker is just the degree of impact in a certain place on a certain object. It is more reasonable to talk about the quality of energy and its use in real life. Accordingly, management of this energy.
ofsinope 3 місяці тому
That moment when he says "spacetime" at the end
Jesse Mai
Jesse Mai 3 місяці тому
show me the math, intuitively I disagree on both experimental and theoretical platforms... show me the math for corrected theoretical measurements and the math for the theory behind it
Sandy 3 місяці тому
i feel intelligent after clicking this video...even though I don't understand what he says
Jay Antani
Jay Antani 3 місяці тому
Cool Video!
James Alexander
James Alexander 3 місяці тому
maybe the entropy of the universe is increasing which would explain it's expansion just like a piece of metal or being that this may only be a short period of rapid expansion; somewhat like an oven that may sit at say 350F for several seconds or more before actually reaching the next digit in temperature. Of course in reality, this may be a period of chaos, destruction & growth in the universe. People often misinterpret current events because they perceive reality to be steady without considering acceleration/deceleration
Ne, oder?
Ne, oder? 4 місяці тому
12:33 says all about spacetime
Sami Saieed
Sami Saieed 4 місяці тому
Totally, An epic episode
John Foyer
John Foyer 4 місяці тому
So this is the cosmic error He spoke of. Hm...well let's say I had a...conversation with a...deity that claimed he was the...creator. he spoke of this miscalculation that was originating from the effects black holes were having on the space time weave of the fabrics within the universe. The miscalculation was the gravitational effect of the first moments when particles first formed. The excess build up of particle formation led to the formation of black holes and the model of creation was a constant spherical shape that would expand and then retract. However o proposed a new algorithm to the model that would redistribute the excess particle energy to instead imbed themselves into the cosmic microwave background and using the energy generated by the particles and motion into and along the CMB to fill in the inconsistencies due to gravitational effects, then using the energy remainder to interweave itself with the fabric of particles stretching the borders of the universe infinitely outward, reinforcing the newly formed particles and allowing them to settle into the formation of matter without the gravitational build up the less to black hole formation. It was about thay time I woke up spitting up the lung fluid that had built up in my lungs while I was sleeping that night...
Luke Tyas
Luke Tyas 4 місяці тому
E Lusso is my next door neighbour, and one of the most wonderful humans in the Universe.
Walt F.
Walt F. 4 місяці тому
Could dark energy have a waveform? Could the expansion of space come in waves? An unaccelerated phase followed by an accelerated phase, followed again by an unaccelerated phase, and so on ad infinitum?
SketchyJay o.o
SketchyJay o.o 4 місяці тому
Could dark energy be caused by a layer of matter/charge which surrounds the universe. During the big bang this "shell" would have been expanded, possibly increasing the "space" between it and all other matter within the universe - reducing interactive forces. This could initially slow the expansion of the universe, however it's ability to expand without fracture could suggest 'elasticity' and would therefore recoil. Eventually this recoil would provide an inward pressure, while increasing the strength of interactive forces - increasing its pull on everything internal. This could therefore create the "illusion" that the expansion is accelerating when in actual fact space is in recession.
kaczan3 4 місяці тому
I love the music during the 14:41 anyone got a link for that?
Blair Macdonald
Blair Macdonald 4 місяці тому
Mr Temporal
Mr Temporal 4 місяці тому
Nice thumbnail
Kickin Rocks
Kickin Rocks 4 місяці тому
Starting a band... Tommy Terror and the Big Rip Quantum Physic and the Maths Bonaparte and the Big Bang White Hole and the Dark Matter Particle and the Waves Entry Lovell and the 101's Tyson Swarm and the Suns 10 Billion Days to Die The Eight Planets Celestial Hot Bodies When Iron Collides Lifeless XO's
Gsup7s 4 місяці тому
Of course it's getting stronger. It's an unlimited free energy source. According to you.
Potato Gang
Potato Gang 4 місяці тому
You know I don't really understand because I'm only 8 years old.
JorDef 4 місяці тому
I´m dumb, the earth is flat, there´s no cosmos there´s only god. We´re the center of all. No Jesus in this video. Because of all that I´m giving this video a dislike. Better go to church and spend money on crucifixes. You all will burn in hell!
FalconPunch827 4 місяці тому
Dark energy is a perfect metaphor for my father. Permeates through all existence but no one has a clue where it is.
Sledcat 4 місяці тому
Supernov eh!
nolan412 4 місяці тому
Big phase change?
Chris Ritchie
Chris Ritchie 4 місяці тому
I discovered The Big Rip in my pants
Mike Price
Mike Price 4 місяці тому
I think part of the problem is we are using Euclid's yardstick instead of Mandelbrot yardstick
Gold161803 4 місяці тому
Take a shot every time the CMB graphic shows up in a Spacetime video
Deep Recce
Deep Recce 4 місяці тому
Question..How do we know the Universe expansion is not slowing down? We know its accelerating only because the further we see the greater the red shift right? But how does it measure up over time, as in maybe in a 1000 years time we see minute change in the expansion vs the current measurement? Also the further we see, meant that we are looking nearer to the beginning of the Universe where acceleration and expansion is greater nearer to the Big Bang..isnt it only natural to read a greater red shift as we see further away or rather further back in time??
GateMessenger 4 місяці тому
The theory is a quasar is a black hole consuming matter at a continuous rate but that is not so. Quasars are actually old galaxies which contain a large amount of stars, plentiful and extremely close together. The older the galaxy is the brighter it shines. Black holes cannot devour matter because of the action that is causing gravity, mentioned in a previous comment. There was no big bang but a slow continuous growth. There is more gravity, matter, energy and space in the universe today than there was yesterday. There is more now than there was in the beginning when the universe did not contain gravity, matter, energy and space. Back then the universe only contained potential gravity, energy, matter and space in time.
GateMessenger 4 місяці тому
The cosmic microwave background radiation map is the result of a manipulation in data, thus unreliable for any study.
GateMessenger 4 місяці тому
No, a big rip will never happen because as new matter is made in space, see pair production and virtual particle theories, space increases in volume (dark energy). It is not being torn apart but increasing in volume like a balloon being filled with air. New particles are made when energy comes to a rest, i.e., m=E/c^2. This is why virtual particles appear to pop into existence in the sun's corona. See the newest ring discovered by astrophysicists orbiting Saturn. When new particle pop into existence in the sun's corona they make light, heat and pairs of particles (plasma). It explains why the sun's corona is millions of degrees hotter than it's surface. This is why stars grow in mass and size over time. Stars cannot 'burn up' over time because mass is constantly added to them. Yes, I know this is conjecture for now. Let's wait and see what the Parker probe discovers.
GateMessenger 4 місяці тому
The lambda CDM 'cold dark matter' model is incorrect and incomplete. The cosmological constant was zero, not accelerating nor decelerating, i.e., a plus one or negative one thus it does not describe the expansion of the universe. Anyone who thinks otherwise needs to go back to school and study it some more.
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