Primordial black holes must have formed before the era of bigbang nucleosynthesis, since otherwise they would have been counted in eq. Adiabatic initial conditions for perturbations in interacting. Cosmology of interacting baryons, dark matter and dark energy. Reconstructing the dark matter and dark energy interaction. Observational constraints on an interacting dark energy model. With this correlation, the self interacting dark matter can explain phenomena such as the tullyfisher relation. Does the manyinteracting worlds theory explain dark energy. We show that the proposals based on the assumption that dark matter is made up of heavy particles with masses which are very sensitive to the value of. Observational constraints on an interacting dark energy model 3 table 1. Sidm was postulated in 2000 to resolve a number of conflicts between observations and nbody simulations of cold collisionless dark matter only on the galactic scale and smaller. Anisotropic stress in interacting dark energy 1859 class of cosmological theories that is the theory of nongravitational interaction between dark matter and dark energy. Pdf inhomogeneous models of interacting dark matter and. Dark matter and dark energy are the most fascinating astronomical puzzles. The rest everything on earth, everything ever observed with all of our instruments, all normal matter.
In this paper, we propose a new approach to study the dark sector of the universe by considering the dark energy as an emerging deformed bosonic scalar field which is not only interacting with the dark matter, but also nonminimally coupled to gravity, in the framework of standard einsteinian gravity. We show that the proposals based on the assumption that dark matter is made up of heavy particles with masses which are very sensitive to the value of dark energy are strongly constrained. A model with one dark matter family can be adjusted so the observational constraints on the cosmological parameters are close to but different from what is predicted by the lambda cdm model. The universe behaves as a vacuumdriven cosmic engine which, in search of equilibrium, always backreacts to vacuuminduced accelerations by increasing its inertia internal energy through. Therefore, in this paper, we test a set of dark energy dark matter interacting models with the purpose of enlightening the physical properties of dark matter.
Nov 12, 2009 we show that an interaction between dark matter and dark energy generically results in an effective dark energy equation of state of w dark matter machos massive compact halo objects. Dark matter, dark energy, dark gravity enabling a universe. In these models different forms of the coupling between dark energy. Pdf coupling dark energy and dark matter through an effective fluid description is a very common procedure in cosmology, however it always remains in. This means it does not absorb, reflect or emit light, making it extremely hard to spot.
Dark energy interacting with dark matter and a third fluid. Constraints on interacting dark energy models through. This class of theories attempts to come up with an allencompassing theory of both dark matter and dark energy as a single phenomenon that modifies the laws of gravity at various scales. This may be a useful aid to judging how tightly the cosmological parameters are constrained by the new generation of cosmological tests that depend on the. In a model with two families of dark matter particles the scalar field may be.
Does the manyinteracting worlds theory explain dark. Using new hubble space telescope imaging and vlt muse integral field spectroscopy, astronomers reveal what may be the first signs of self interacting dark matter for the first time dark matter may have been observed interacting with other dark matter in a way other than through the force of gravity. Theory of dark energy and dark matter 3 we proceed as follows. However, if any one of them persists, they may be an indication that the dark matter is not collisionless. Research article interacting dark matter and deformed dark. May 2016 cernth2016104 quantum field theory of interacting dark matter dark energy.
E4 at least 60 orders of magnitude too large for a bare cc to cancel these. We consider a class of interacting dark energy models in a flat and nonflat flrw universe where the interaction is. Astronomical observations and cosmological theory suggest that the composition of the universe is remarkably rich and complex. Moreover, since the densities of dark energy and dark matter are nearly equal today there may be some coupling or interaction between them.
Learn vocabulary, terms, and more with flashcards, games, and other study tools. So, the important cosmological role of dark matter is in the past when it was the dominant contribution to the energy density, roughly the first few billion years. Natural simplest possibility, consistent with all data to date, is a constant. We discuss models for the cosmological dark sector in which the energy density of a scalar field approximates einsteins cosmological constant and. We show that an interaction between dark matter and dark energy generically results in an effective darkenergy equation of state of w dark matter and dark energy. Quantum field theory of interacting dark matter and dark. Our future is determined by the nature of the dark energy, which is sufficient to cause the current expansion of the.
Dark matter, in contrast to particles like the neutron, must be stable for at least hundreds of billions of years, so it absolutely cannot decay away on typical timescales that the d. The people looking are among the smartest in the world and the methods and direction of research has ranged over a very wide scop. Interactions between dark matter and dark energy the. Whereas dark matter of a single, inert type such as an axion would enshroud galaxies in spherical clouds called halos, particles in a dark sector might interact with one another in ways that release energy, enabling them to cool and settle into a lowerenergy configuration. We investigate a spatially flat friedmannrobertsonwalker frw cosmological model with cold dark matter coupled to a dark energy which is given by the modified holographic ricci cutoff. Dark matter is the name given to the unseen mass whose gravity governs the observed motions of stars and gas clouds. Selfinteracting dark matter 3 astrophysical processes in the models. Dynamics of interacting tachyonic teleparallel dark energy. A cosmological model of dark energy interacting with dark matter and another general component of the universe is considered. Request pdf interacting dark matter and dark energy we discuss models for the cosmological dark sector in which the energy density of a scalar field approximates einsteins cosmological. Interacting dark energy collapse with matter components. Pdf covariantizing the interaction between dark energy and dark. It might have enough energy density to stop its expansion and recollapse, it might have so little energy density that it would never stop expanding, but gravity was certain to slow the expansion as time went on.
Dark energy, dark matter science mission directorate. Analytic study of the effect of dark energydark matter interaction on. Self interacting dark matter has also been postulated as an explanation for the dama annual modulation signal. Pdf 396 k pdf plus 397 k signchangeable interacting agegraphic dark energy in bransdicke cosmology. The equations for the coincidence parameters r and s, which represent the ratios between dark energy and dark matter and the other cosmic. Signchangeable interacting agegraphic dark energy in. In order to solve this problem, many approaches emerged 58. Self interacting dark matter 3 astrophysical processes in the models. Dark matter, though also a compelling mystery, is totally unrelated to dark energy. Contrary to the current conjecture that dark energy is a negative vacuum energy that might interact with dark matter, comparisons of our theoretical results with observational results of.
Effects of anisotropic stress in interacting dark matter. The nongravitational interaction in the dark sector, precisely between dark matter and dark energy is a phenomenological con. Unlike normal matter, dark matter does not interact with the electromagnetic force. It is generally accepted now that dark energy dominates the universe, making up 74 percent of the total massenergy of the cosmos, the remainder being made up by normal matter 4 percent and dark matter 22 percent. Signchangeable interacting agegraphic dark energy in brans. Rep, your q does the manyinteracting worlds theory explain dark energy and dark matter no need for dark energy and dark matter. Quiz chapter 23 dark matter, dark energy, and the fate of the universe. Dissertation of the faculty of physics dissertazione. Pdf interacting dark matter as an alternative to dark energy. In fact, researchers have been able to infer the existence of dark matter only from the gravitational effect it seems to have on visible matter. Dimensionless age parameter as a function of redshift for interacting holographic dark energy models. The equation naturally correlates the dark matter distribution to that of the baryonic matter distribution.
More is unknown than is known we know how much there is, and we know some of its properties. In fact, the interaction term between the two uids behaves as an e ective pressure entering the energy conservation equation, and consequently a ecting the dust picture of. Quantum field theory of interacting dark matterdark. A unifying theory of dark energy and dark matter astronomy. The equations for the coincidence parameters r and s, which represent the ratios between dark energy and dark matter and the other cosmic fluid respectively, are analyzed in terms of the stability of stationary solutions. Dark matter, dark energy, and the fate of the universe. We discuss how to formulate a quantum field theory of dark energy interacting with dark matter. In astrophysics and particle physics, selfinteracting dark matter sidm assumes dark matter has selfinteractions, in contrast to the collisionless dark matter assumed by the lambdacdm model. Jcap112010044 coupled dark matterdark energy in light of near universe observations. With interaction dark energy and dark matter follow one another, as displayed in fig. We show that an interaction between dark matter and dark energy generically results in an effective dark energy equation of state of w interaction alters the redshift. Dark energy is the name given to whatever might be causing the expansion of the universe to accelerate.
Nov 17, 2016 rep, your q does the manyinteracting worlds theory explain dark energy and dark matter no need for dark energy and dark matter. A model with one dark matter family can be adjusted so the observational constraints on the cosmological parameters are close to but. The baryons, or baryonic matter, which is a better term for our case, is matter that is made up of massive particles that we know. These generalizations produce non conserved energy momentum tensors instead of conserved energy momentum tensors which leads at the end to a formulation of interacting dedm dust models in the form of a diffusive type interacting uni. Here a framework is proposed to address these two problems, based on treating the cosmic background vacuum dark energy as both dynamical and interacting. In fact, using the dynamical system analysis, we obtain the cosmological consequence of several interactions, considering all relevant component of universe, i. Dark matter, dark energy, dark gravity is available as an ebook or paperback. Ratings are consistently averaging 4 stars or above on goodreads. Schematic cartoon of gravitational interactions between positive. Pdf 2 3 interacting dark matter and holographic dark energy.
Extraordinary dark matter wimps weakly interacting massive particles. The possible first signs of selfinteracting dark matter. After correcting the growth function for the correspondence with the velocity field through the continuity equation in the interacting model, we use our analytic result. In this paper we argue that all of the discrepancies listed above may be resolved if the dark matter has strong selfinteractions.
One interesting suggestion was a diffusive exchange of energy between dark energy and dark matter made by calogero 9,10, haba et al. An ecological approach to problems of dark energy, dark matter. The evolution of perturbations on superhubble scales with various values of the dark energy equation of state parameter in the radiation and matter dominated eras. Candidates include primordial black holes, axions, sterile neutrinos, and weakly interacting massive particles wimps. In order to analyze the dynamic of the system, we first give the. The existence of a rich dark sector of particles could have consequences on galactic scales. Journal compilation c 2010 ras adiabatic initial conditions for perturbations in interacting dark energy models elisabetta majerotto 0 1 jussi v a. Cdm, until the particle number density becomes low enough to allow the scalar field to evolve. We have been looking for dark energy and dark matter dedm for quite some time now without any significant results. Interacting dark energy model and thermal stability. Holographic dark energy interacting with dark matter. First, we have shown in ma and wang, 2014a a new cosmology theorem that our universe is a three dimensional sphere and is static, assuming the einstein general relativity and the cosmological principle that our universe is homogeneous and isotropic.
Pdf observations continue to indicate that the universe is dominated by. Interacting dark matter and dark energy request pdf. It is generally accepted now that dark energy dominates the universe, making up 74 percent of the total mass energy of the cosmos, the remainder being made up by normal matter 4 percent and dark matter 22 percent. This can suppress the longrange scalar force in the dark sector and eliminate evolution of the effective cosmological constant and the mass of the nonrelativistic dark matter particles, making the model close to. Interacting diffusive unified dark energy and dark matter. Einsteins cosmological constant particle physics provides sources for such a constant but the energy scales associated with particle physics scale cutoffs and transitions give energy densities. Deathblow dealt to dark matter disks quanta magazine.
Roughly 70% of the universe is made of dark energy. The interaction used is linear in both dark energy densities, the total energy density and its derivative. Thus, various forms of interacting dark energy models 1115 have been constructed in order to fulfil the observational requirements. Therefore, in the beginning there were the same fluctuations, then dark matter was enhanced leading to higher.
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