Explaining dark matter and neutrino mass in the light of. Can sterile neutrinos constitute all of the dark matter, independently of what mechanism they were produced by. Register by sept 30th and sooner for financial support. Neutrinos may make up significant part of dark matter. The abundance of dwarf satellite galaxies found in the milky ways neighborhood is lower than predicted from cold dark matter models. Around us the mass density of matter mass per unit volume is math0. We also discuss prospects for discoveries at current and next generation neutrino detectors. A full proof will take more time, said werner rodejohann, a neutrino specialist at the max planck institute for nuclear physics in heidelberg who was not involved in the experiments, but my and many others feeling is that there is something real here. Two neutrino double electron capture is an exceedingly rare particle interaction that was first theorized in 1955 and has escaped detection for decades. Special and general relativity atomic and condensed matter nuclear and particle physics beyond the standard model. For decades, astrophysicists have thought some sort of invisible dark matter must pervade the. Neutrinos are one candidate for dark matter but only if they have a nonzero rest mass. Review of indirect detection of dark matter with neutrinos iopscience. If these oscillations do indeed occur and there are experiments that believe to have detected them, then the neutrino would be required to have a rest mass.
What is the role of neutrinos in shaping the universe. Oct 09, 2015 you might have heard a lot about neutrinos lately after the 2015 nobel prize in physics. The remaining sources of solar neutrinos induce recoils with energies and rates below that of the 8b induced spectrum. First we discuss the motivation and limits obtained through astrophysical observations. Very massive neutrinos have also been considered as dark matter candidates, first. Neutrinossubatomic particles with no charge and which rarely interact with matter. You can convert this into an estimate of the total neutrino contribution to dark matter, and it works out to be 0. Given that we have found it is actually six to ten times larger than this, we. A possible candidate of warm dark matter is the sterile neutrino. Previous fits of sterile neutrino dark matter dm models to cosmological data ruled out masses smaller than approximately 8 kev, assuming a production mechanism that. Physicists have suggested dark matter is a closely related cousin of the neutrino, called the sterile neutrino. Thus cold dark matter is also required to explain the currently measured galactic rotation curves.
Neutrinos are natures lightest particles of matter, and were churned out in vast quantities just after the universe formed. Study suggests the elusive neutrino could make up a. If there are trillions of them all around us at any moment, virtuall. Phenomenology of neutrino portal dark matter and supersymmetry barmak shams es haghi, phd university of pittsburgh, 2019 in this thesis we investigate the neutrino portal dark matter which tries to explain nonbaryonic dark matter and the neutrino masses at. If a larger fraction of the dark matter is hot, the growth of structure in the universe is suppressed too much. On the other hand, sterile neutrinos are competitive dark matter candidates. We implement the typei seesaw mechanism for generating the masses of the standard model sm neutrinos and consider three heavy neutrinos. The weak interaction changes the temperature dependent planck distribution of the electromagnetic oscillations and changing the noncompensated dark matter rate, giving the responsibility to the sterile neutrino. What people will usually say about dm is that it is cold and collisionless, cold dark matter cdm, or collisionless cold dark matter ccdm. How massive would the neutrinos have to be so that relic neutrino from the big bang would account for all dark matter.
The last part discusses the nonlinear stage of gravitational clustering and highlights the e. Neutrino dark matter connections in gauge theories pavel fileviez p erez1, clara murgui2, alexis d. Dark matter isnt behind mysterious space signals futurity. Explaining dark matter and neutrino mass in the light of type. The particles with high velocity could easily escape from matter dense regions of the universe.
This is our best bet for the nature of dark matter. We consider a hidden sector comprised of a fermion and a complex scalar, with the lightest one regarded as a fimp candidate. Neutrinos provide a fertile ground to search for particle physics beyond the standard model, which could include a dark matter particle. What neutrino signal from dark matter decay can be observed at earth.
To nd if this neutrino was the same one as discovered from decay, in 1962 lederman. Mar 10, 2016 the fact that neutrinos have tiny but nonzero masses and the universe appears to be filled with a mysterious dark matter are two of the biggest puzzles. Icecube searched for heavy dark matter in two independent measurementsone using six years of muon neutrino tracks from the northern hemisphere and the other using two years of allflavor neutrino. Testing dark matter distributions by neutrinodark matter. Direct dark matter detection experiments will soon be sensitive to neutrinos from astrophysical sources, including the sun, the atmosphere, and supernovae, which will set an important benchmark and open a new window into neutrino physics and astrophysics. The fact that neutrinos have tiny but nonzero masses and the universe appears to be filled with a mysterious dark matter are two of the biggest puzzles. Neutrino and dark matter physics laboratory for nuclear science. The electron neutrino is known to have a mass at least 50,000 times smaller than the mass of the electron, and neutrinos are often assumed to be massless. Could righthanded neutrinos solve the dark matter puzzle. Hot dm refers to particles, such as neutrinos, that were moving at nearly the speed of light at redshift z. The neutrino astrophysics and cosmology working group put special emphasis on the following primary questions of the neutrino study.
The neutrino and dark matter group at mit is more than just about neutrinos, or dark matter. However, previous models using this socalled sterile neutrino as a form of dark matter were not able to satisfy constraints from cosmological observations. Despite the skepticism, rodd says hes reasonably convinced that his team has shown that the 3. If you have three species of light neutrino, it would only take a relatively small amount of mass to account for all the dark matter. Later on, we will consider dark matter candidates which annihilate or decay producing standard model neutrinos. Active endeavors are under way to launch the era of precision neutrino measurement science pnms, that will surely broaden the horizon of our knowledge about neutrinos. At this time, almost nothing is known about the dark matter particles, which constitute about 80% of the matter in the universe by mass. Ordinary dark matter machos massive compact halo objects. Neutrino coherent scattering rates at direct dark matter. It describes these issues in terms of links, between cosmology, particle and nuclear physics, as well as between cosmology, atmospheric and terrestrial physics. A white paper on kev sterile neutrino dark matter editors. Much of the work of untangling a dark matter signal from neutrino background will come during data analysis.
Dark matter and neutrinos are both cosmic loners they dont interact with much. They may, however, be responsible for a number of unexplained phenomena in physical cosmology and astrophysics, including dark matter, baryogenesis or dark radiation. Theoretical investigations of neutrino and dark matter properties. This is in fact the case in the msm 3, where the lightest rh neutrino has a kevscale mass and is the dark matter 4. We present a comprehensive analysis of constraints on the sterile neutrino as a dark matter candidate. We then explore two different implementations of the neutrino portal in which neutrinos mix with a standard. Decay rate very small, but large lumps of dark matter emit some xrays.
Neutrino astronomy dark matter wimp indirect searches wimp direct searches summary and conclusions neutrinos, dark matter and our universe the strongest experimental evidence we have for physics beyond the sm are from the observation of neutrino oscillations and dm. Dark matter, neutrinos, and our solar system is a unique enterprise that should be viewed as an important contribution to our understanding of dark matter, neutrinos and the solar system. Neutrino and dark matter physics laboratory for nuclear. Neutrino plus baryon models have a difficult time forming galaxies early enough and these models predict galaxy clustering properties significantly different from those observed in our universe. Apr 12, 2018 indeed, several theoretical models ascribe the cosmic neutrino signal detected by icecube at tevpev energies to the decay of heavy dark matter. Dark matter detector makes incredible neutrino observation. We study the freezein production of feebly interacting massive particle fimp dark matter candidates through a neutrino portal. Pdf constraints on sterile neutrino dark matter kevork. The longstanding puzzle to be solved is why we and everything we see is matter made. Dark matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total energy density.
Sterile neutrinos are one of the leading dark matter candidates. If the sterile neutrino couplings are very small and their direct coupling to the inflaton is forbidden by the lepton number symmetry, the leading dark matter production mechanism is the freezein scenario. Pdf neutrinodark matter connections in gauge theories. Searching for dark matter with the antares neutrino telescope. Their masses may originate from a vacuum expectation value of a scalar field. Pdf a white paper on kev sterile neutrino dark matter. Dark matter mary bishai neutrinos solar neutrinos accelerator neutrinos measuring the absolute mass neutrino astronomy dark matter wimp indirect searches wimp direct searches summary and conclusions neutrinos and dark matter highlights from ichep 08 mary bishai september 18, 2008. The electron neutrino is known to have a mass at least 50,000 times smaller than the mass of the electron, and neutrinos are often assumed to be massless which means zero rest mass. Dark matter, baryogenesis and neutrinos mikhail shaposhnikov isapp 2011. Apr 05, 2018 you can convert this into an estimate of the total neutrino contribution to dark matter, and it works out to be 0. Phenomenology of neutrino portal dark matter and supersymmetry barmak shams es haghi, phd university of pittsburgh, 2019 in this thesis we investigate the neutrino portal dark matter which tries to explain nonbaryonic dark matter and the neutrino masses at the same time.
A huge cloud of invisible particles seems to be missing. How useful are neutrinos to detect or to constrain decaying dark matter. Altogether, the role of neutrinos is of great interests in cosmology and understanding dark matter. So, if neutrinos are the dark matter in our galaxy, then there is a need for a second type of dark matter for low mass galaxies. But dark matter could give neutrinos their mass through a weak repellant force. Pdf constraints on sterile neutrino dark matter savvas. So how does all this fit in with the mystery of dark matter. School and workshop on dark matter and neutrino detection ictp. Can a sterile neutrino of a given mass and mixing angle exist, independently of what fraction of dark matter it forms. A hypothetical neutrino that does not interact through the weak force could be the source of a recently detected xray emission line coming from galaxy clusters.
School and workshop on dark matter and neutrino detection. Icecube searched for heavy dark matter in two independent measurementsone using six years of muonneutrino tracks from the northern hemisphere and the other using two years of allflavor neutrino. Righthanded neutrino dark matter in a u1 extension of the. In may 2018, physicists of the miniboone experiment reported a stronger neutrino oscillation signal than expected, a possible hint of sterile neutrinos. In the standard big bang model, copious numbers of neutrinos were produced in the early universe. Neutrino coherent scattering rates at direct dark matter detectors 4 8b 7be. May 15, 2019 we discuss the connection between the origin of neutrino masses and the properties of dark matter candidates in the context of gauge extensions of the standard model. One strategy involves taking advantage of the natural ebbs and flows in the amount of dark matter and neutrinos hitting earth. Abazajian puts in in his recent paper resonantly produced 7 kev sterile neutrino dark matter models and the properties of milky way satellites. However, the rest masses must still be very small so they could only contribute to the hot dark matter. Previous fits of sterile neutrino dark matter dm models to cosmological data ruled out masses smaller than approximately 8 kev, assuming a production mechanism that is not the best motivated.
Journal of cosmology and astroparticle physics explaining dark matter and neutrino mass in the light of typeii seesaw model to cite this article. Sterile neutrinos with mn kev have lifetime larger than the age of the universe, but they do decay into a lighter neutrino state and a photon. This workshop will provide a venue for those working on directdetection dark matter experiments and related mediumsized neutrino detectors to discuss the challenges that we face with data as these grow evermore sensitive to both dark matter and neutrino physics, there is an inevitable increase in size and data volume. Plascencia1 1physics department and center for education and research in cosmology and astrophysics cerca, case western reserve university, rockefeller bldg. The consortium of four faculty members conrad, formaggio, perez and winslow are focused on understanding the properties of some of the most elusive particles in the universe, both to strengthen our understanding of the standard model and to push its boundaries. Pdf neutrino portal to fimp dark matter with an early. Extraordinary dark matter wimps weakly interacting massive particles. Neutrino physics with dark matter detectors annual. Theory links dark energy and neutrinos new scientist. Neutrino lecture notes lecture notes based in part on a lectures series given by pilar hernandez at tasi 20, neutrinos1, and on notes written by evgeny. Neutrinos havent been viable dark matter since the 1980s. Now, the neutrino oscillation experiments prove that neutrinos have a nonzero rest mass. Neutrinos are an unavoidable background for dark matter detection and upcoming experiments will soon reach the socalled neutrino floor. The detection of these neutrinos will be complementary to accelerator and reactorbased experiments that study neutrinos over the same.
This is sufficient to consistently reproduce a wide variety of observations including the new gravitational lensing measurements. Inside the superkamiokande neutrino detector during work on the detectors. Prepared for submission to jcap a white paper on kev sterile neutrino dark matter editors. Neutrinos could shed light on why the universe has so much. From the results of the calculations it is concluded that both the crosssection and the neutrino oscillation pattern depend on the features of each of the adopted models for the dm distributions.
You might have heard a lot about neutrinos lately after the 2015 nobel prize in physics. International conference on neutrinos and dark matter ndm2020. Indeed, several theoretical models ascribe the cosmic neutrino signal detected by icecube at tevpev energies to the decay of heavy dark matter. Combining 20 years of such observations allowed for a probe of sterile neutrino dark matter to unprecedented levels. Our results suggest that neutrinos make up between 3% and 5% of the total dark matter mass.
While the presence of dark matter dm in the universe. Its presence is implied in a variety of astrophysical observations, including gravitational effects that cannot be explained by accepted theories of gravity unless more matter is present than can be seen. Mystery of neutrino masses may be explained by dark matter. Physicists brawl over new dark matter claim science aaas. Mar 16, 2018 dark matter and neutrinos are both cosmic loners they dont interact with much.
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