Does the CMB prefer a leptonic Universe?
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| Number of Parts | 63 | |
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| License | CC Attribution 3.0 Unported: You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor. | |
| Identifiers | 10.5446/39011 (DOI) | |
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00:00
Electric power distributionCosmic microwave background radiationUniverseLeptonPlain bearingParticle physicsVideoComputer animation
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VideoUniverseMeeting/Interview
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LeptonNeutrinoUniverseRoll formingAtomic nucleusBaryonNeutronElectronMountainPhase (matter)IonMeeting/Interview
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Order and disorder (physics)Cosmic microwave background radiationLeptonLightBahnelementSizingBaryonenasymmetrieContrast (vision)Orbital periodMicrowaveMeeting/Interview
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PhotonBarometerLeptonNuclear powerThermodynamic equilibriumBig Bang nucleosynthesisUniverseNucleosynthesisTiefdruckgebietNeutrinoHose couplingBending (metalworking)Meeting/Interview
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Big Bang nucleosynthesisLimiterAngeregter ZustandChemical substanceLeptonMeeting/Interview
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NeutrinoBig Bang nucleosynthesisLeptonUniverseStandard cellNucleosynthesisNuclear powerMeeting/Interview
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UniverseCosmic microwave background radiationStuke, MaikParticle physicsPlain bearingHigh Frequency Active Auroral Research ProgramSpace probeMicrowaveCardinal directionDipolUniverseNeutrinoLepton
Transcript: English(auto-generated)
00:03
Hi, in this video abstract we would like to introduce our publication Does the CMB prefer a leptonic universe? My name is Mike Stuckel. And my name is Dominik Schwarz and we are both from Bielefeld University. We know two forms of matter, baryons and leptons from laboratory physics.
00:24
Baryons are for instance atomic nuclei consisting of protons and neutrons. Leptons are electrons or neutrinos for instance. In the universe we know that there is an asymmetry between matter and antimatter. There is much more matter in the universe than antimatter.
00:42
There is a remarkable agreement for the size of the baryon asymmetry measured by the abundance of light elements, primordial light elements like helium and deuterium and the observation of the cosmic microwave background. Both of them predict that the order of the asymmetry is 10 to minus 10. In contrast to that the lepton asymmetry remains totally unknown.
01:04
There can be a large lepton asymmetry in the universe because you can hide a large amount of asymmetry in neutrinos. They would be at low energy and wouldn't escape all our attempts to detect them in today's universe. But they could be observable in the very early universe
01:24
by their consequences on the Big Bang nuclear synthesis and photon decoupling. They would lead to an increase of the expansion rate of the universe and they would influence the weak equilibrium before the Big Bang nuclear synthesis. Helium can be viewed as a leptometer
01:43
and the abundance of deuterium could be viewed as a barometer. This publication is triggered by new data from small-scale CMB from the Atacama Cosmology Telescope, from the South Pole Telescope and from the final data analysis of the WMAP team.
02:00
This allows us to compare a global analysis of the primordial helium abundance with a more local one from observations of extragalactic H2 regions. So this would allow us to put some limits on the lepton asymmetry. We find that the standard Big Bang nuclear synthesis with vanishing lepton asymmetry is still OK.
02:24
However, the new CMB data and the observed deuterium abundances seem to favour a sizeable surplus of antineutrinos in the universe. For further details, read our article Does the CMB prefer a leptonic universe? in the new Journal of Physics.