This is particularly compelling when the ir cutoff is set by the hubble scale, since otherwise a transition from a decelerated to an accelerated era cannot be obtained for a spatially flat universe. We consider conditions on the bransdicke parameter compared with the conditions for the acceleration and phantom phases to show which entropycorrected models can have acceleration and a phantom. A model for holographic dark energy is proposed, following the idea that the short distance cutoff is related to the infrared cutoff. We then proceed from there to show, using dvoretzkys theorem of measure concentration, that the total energy of the universe is divided into two parts, an ordinary energy very small part which we. Dark energy is a monophonic analogue synthesizer with usb and midi interface. We compare models for which the hubble scale, the future event horizon or a quantity proportional to the ricci scale are taken as the infrared cutoff length. Pdf comparing the holographic principle inspired dark. The uv cutoff is related to the vacuum energy and the ir cutoff is related to the large scale of the universe. In the holographic principle and dark energy, could the 2d. The expansion of the universe is accelerating, driven by a dark energy that presently. Ileana created a pdf file of the holographic med beds. With the holographic universe michael talbot has created his masterpiece. Bianchi type iii holographic dark energy cosmological. These particles necessarily obey infinite statistics in which all representations of the particle permutation group can occur.
We generalize the energy density of the ricci dark energy as 3e2 2 22 2 x m h hk px. Aug 20, 2019 the holographic principle is a property of quantum gravity theories which resolves the black hole information paradox within string theory. Holographic uni cation of dark matter and dark energy. The main existing explanations, namely the uvir connection argument of cohen et al, thomas bulk holography argument, and ngs spacetime foam argument, are shown to be not wholly satisfactory. Pdf holographic dark energy and cosmic coincidence. Bianchi type iii holographic dark energy cosmological model. Dark energy is housed in a rugged black steel case with wooden sidepanels. In 2002, salvatore capozziello proposed the fundamental new point of view to dark energy. In particular, to be consistent with observations, we suppose that dark energy departs smoothly from a pure cosmological constant. Pdf we embed models of holographic dark energy coupled to dark matter in minimal supergravity plus matter, with one chiral superfield. Holographic dark energy density, international journal of. Ideas are gradually beginning to take shape on how concepts like holography and other deep insights uncovered in the past two decades may lead to new fundamental principles for cosmology. We investigate the observational signatures of the holographic dark energy models in this paper, including both the original model and a model with an interaction term between the. In the 1970s researchers knew that when an object becomes part of a.
Firstly, we take the holographic dark energy model with grandaoliveros cutoff and discuss interacting as well as noninteracting cases. Holographic dark information energy gets my vote for the best mix of arcane theoretical concepts expressed in the shortest number of words and just to keep it interesting, its mostly about. Banks and dine argue that all explanations for dark. Comparing holographic dark energy models with statefinder. The aim of this paper is to analyze the cosmological evolution of holographic dark energy in gravity and represent the gaussbonnet invariant and trace of the. However, from the laymans point of view, there are two small problems with understanding dark energy when you call it dark energy. E4 at least 60 orders of magnitude too large for a bare cc to cancel these. A model for holographic dark energy is proposed, following the idea that the short distance cuto. The possible holographic origin of dark energy is investigated. In physics, quintessence is a hypothetical form of dark energy, more precisely a scalar field, postulated as an explanation of the observation of an accelerating rate of expansion of the universe. A thermodynamic approach to holographic dark energy. The interacting generalized ricci dark energy model in non.
Interacting holographic dark energy, cosmic coincidence and the. Here we deal with models where the holographic bound for dark energy is not saturated for a large portion of the history of the universe. The holographic principle, which was my basic assumption, in solving the dark energy problem, implies that the threedimensional world we perceive is merely an illusion and that really it. Narrow light beam 2 from the laser 1 is directed by the mirror 3 to spatial filter 4, which expands the beam up to the necessary size and simultaneously improves its homogeneity. Then, we describe the properties of hde model, in which the future event horizon is chosen as the characteristic. The concept was expanded to more general types of timevarying dark energy and the term quintessence was first.
Now a paragraph, on ipmu, which is the institute for the physics and mathematics of the universe, university of tokyo, which started oct. Its unexpected and counterintuitive discovery in the late 1990s was initially met with skepticism, but further studies have. It can be the interference pattern on a photographic plate from a threedimensional object, or the entropy impressed on the surface of a black hole, or a physical theory translated into another form. May 30, 2011 holographic dark information energy gets my vote for the best mix of arcane theoretical concepts expressed in the shortest number of words and just to keep it interesting, its mostly about. All holographic dark energy models, such as ricci dark energy models and secondorder invariants, are contained in the above classes of generalized holographic frameworks. We study some holographic dark energy models in chameleonic bransdicke field gravity by taking interaction between the dark energy components in frw universe. Fraction of coincidental time to the total lifetime of the universe is calculated. Natural simplest possibility, consistent with all data to date, is a constant. Holographic dark energy and the universe expansion acceleration by j. Dark energy is an asyet unexplained force that appears to be accelerating the expansion the universe. By incorporating the holographic principle in a timedepending.
Holographic dark energy holographic dark energy models compared with cosmological constant models, imply a high degeneracy. Together with shinichi nojiri, odintsov also proposed a generalized holographic dark energy model which includes eventually all possible variations over original holographic dark energy. If quantum wave of the universe then quantum particle. Testing some fr,t gravity models from energy conditions. May 24, 2015 physicists are very close to say that cosmological constant is the explanation of dark energy. As for the size, which is l regarded as an ir cutoff, various possibilities are discussed in literatures, such as the hubble parameter l. Evidence for its existence dates from the 1930s and is very solid. Introducing the theoretical ideas, observational methods and results, this textbook is ideally suited to graduate courses on dark energy, and will also supplement advanced. We investigate the observational signatures of the holographic dark energy models in this paper, including both the original model and a model with an interaction term between the dark energy and 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.
Talbot masterfully combines science, research, theories on human consciousness, and eloquence into a colorful collage which in my opinion remains unrivaled as the. Use features like bookmarks, note taking and highlighting while reading dark energy. Reconstruction of modified holographic ricci dark energy in. We consider conditions on the bransdicke parameter compared with the conditions for the acceleration and phantom phases to show which entropycorrected models can have acceleration and a phantom phase in the early. The holographic principle is a property of quantum gravity theories which resolves the black hole information paradox within string theory. The first example of this scenario was proposed by ratra and peebles 1988. We observe that by adjusting suitably these input parameters, energy. Odintsov born 1959, shchuchinsk, kazakhstan is a spanishbased russian astrophysicist active in the fields of cosmology, quantum field theory and quantum gravity. We study dark energy density in universe with arbitrary spatially curvature described by the friedmannrobertsonwalker metric. Abstractby incorporating the holographic principle in a timedepending.
I do occasionally read the reference frame, as lubos blograge is, always, at least mildly titillating. Holographic dark energy density holographic dark energy density saadat, hassan 20110126 00. Einsteins equations of general relativity modern notation. Holographic dark energy and the universe expansion acceleration. Dark matter an undetected form of mass that emits little or no light but whose existence we infer from its gravitational in. Holography, dark energy and entropy of large cosmic structures. Download it once and read it on your kindle device, pc, phones or tablets. Only the usbmidi interface uses, of course, digital components. Dark energy is just possibly the most important problem in all of physics. In the 1970s researchers knew that when an object becomes part of a black hole, two things happen.
We assume that the infrared cutoff relevant to the dark energy is the size of the event horizon. Dark energy, the mysterious cause of the accelerating expansion of the universe, is one of the most important fields of research in astrophysics and cosmology today. He also collaborates as group leader at research projects of the tomsk state pedagogical university. We thus describe the dynamics of tsallis holographic dark energy in a flat friedmannlemaitrerobersonwalker background. Pdf the proposed dark energy, holographic, with new infrared cutoff ir of granda and oliveros 2009 has been investigated in bianchiiii. We consider fr,t theory of gravity, where r is the curvature scalar and t is the trace of the energy momentum tensor. Dark energy an unknown form of energy that seems to be the source of a repulsive force causing the expansion of the universe to. In this model, dark energy consists of two components. The biggest mystery in the universe dark matter, how the universe works, holographic universe, quantum physics black holes, parallel universe, the string theory kindle edition by stoner, paul.
Cosmic evolution of holographic dark energy in gravity hindawi. A number of holographic dark energy models attempt to account for dark. Different holographic darkenergy models are studied from a unifying point of view. Considering then the dark energy as a purely geometric entity, for which no equation of state has to be introduced, it is shown that the resulting range of allowed values for the parameters may explain both the coincidence problem and. Thomas has suggested that using the holographic principle to count the available. As a modern version of platos cave, the hp states that all of the information contained in a volume of space can be represented as a hologram, which corresponds to a theory locating on the boundary of that space. Setare 29 studied the cosmological application of holographic dark energy density in the bransdicke framework and suggested a correspondence between the holographic dark energy scenario in flat universe and the phantom dark energy model in the figure 1 the hubble parameter h reconstructed by considering mhrde in fac see equation 5. We studied a unified approach with the holographic, new agegraphic, and dark energy model to construct the form of which in general is responsible for the curvature driven explanation of the very early inflation along with presently observed late time acceleration. We demonstrate that the mere definition of the holographic dark energy density generally implies an interaction with the dark matter component. Cosmology of some holographic dark energy models in. The holographic dark energy is reexplained by considering the quantum uncertainty and discreteness of spacetime. Inspired by the investigation of black hole thermodynamics, gerard t hooft proposed for the first time the famous holographic principle hp.
Then, we describe the properties of hde model, in which the future event horizon is chosen as the. Abstractquantum fluctuations of spacetime give rise to quantum foam, and black hole physics dictates that the foam is of holographic type. Pdf new holographic dark energy in bianchi iii universe with k. It was available on this website, but it was removed to protect her ed material.
Holographic dark energy and the universe expansion. In the bransdicke cosmology framework, we study holographic dark energy models with interaction and with powerlaw and logarithmic entropy corrections for different cutoffs. Applied to cosmology, the holographic model requires the existence of dark energy which, we argue, is composed of an enormous number of inert particles of extremely long wavelength. The entire soundgeneration as well as all its modulationsources are 100% true analogue. This paper investigates the tsallis holographic dark energy thde model in accordance with the apparent horizon as an infrared cutoff, in a non flat universe. For anyone even remotely interested in the convergence of science and metaphysics, this book is a mustread. The desitter space associated with the accelerating universe poses serious problems for the formulation of string theory 15. Keywords black hole entropy holographic principle cosmological constant the holographic principle susskind 1995. We obtained correspondence of proposed new holographic dark. Secondly, we consider the holographic dark energy with both powerlaw as well as.
Holographic foam, dark energy and infinite statistics core. Pdf holographic dark energy from minimal supergravity. Reconstruction of modified holographic ricci dark energy. Holographic dark energy and quantum entanglement request pdf. Pdf a model of holographic dark energy researchgate. 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. We also predict that there may exist more dark energy between two adjacent black holes. Several potential problems of the explanation are also discussed. Theory of dark energy and dark matter 3 we proceed as follows. Holographic dark information energy 30 may 2011, by steve nerlich the bubble nebula ngc 7635 it doesnt have a lot to do with holographic dark information energy, but you. Introduction understanding the origin of dark energy is one of the most important quests in modern cosmology and fundamental physics.
New holographic dark energy in bianchi iii universe with kessence. Cq recently one kind of holographic dark energy model is used to explain the observed dark energy 14. Apr 07, 2010 i have discussed dark energy, and the holographic principle. Ileana did host the awakening cosmic reality show on youtube an interview program covering topics such as spirituality, et contact, healing modalities, awakening and the ascension process. The eld equations for bianchi tupe iii space time are 4. A model of holographic dark energy internet archive. Apr 07, 2003 the world, in a sense, may be a hologram. Dark energy is the winner of my personal award for the most misleading physics jargon of the 21st century. Keywords gravitons, dark energy, quantum cosmology, holographic principle 1. We considered the generalized uncertainty principle in our approach which incorporated the corrections in the entropy. Making use of the hp and the dimensional analysis, we derive the general formula of the energy density of hde. Astronomy without a telescope holographic dark information.
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