In the observational aspect, we introduce cosmic probes, dark energy related projects, observational constraints on theoretical models and model. Miao li, xiaodong li, shuang wang, yi wang submitted on 30 mar 2011 v1, last revised 7 oct 2011 this version, v6 abstract. Present and future evidence for evolving dark energy. Liddle, pia mukherjee, david parkinson and yun wang download pdf 211 kb. Testing the phenomenological interacting dark energy with. Theory and observations, luca amendola and shinji tsujikawa cambridge u. 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 gen. The most conservative suggestions are that the universe is filled with a uniform sea of quantum zeropoint energy, or a condensate of new particles that have a mass that.
Dark energy by yun wang overdrive rakuten overdrive. We present a simple and efficient method for incorporating constraints from cmb anisotropy data, and use it to derive constraints on cosmic curvature and dark energy density as a free function of cosmic time using current data. Illuminating dark energy with the joint efficient darkenergy. Through a tangled history, dark energy is tied to einsteins cosmological constant. She has worked on advancing the methods for interpreting dark energy data, and developing optimal observational strategies for probing th. We derive distance priors from planck first data release, and examine their impact on dark energy constraints from current observational data. Get your kindle here, or download a free kindle reading app. Dark energy in practice international journal of modern. Providing a brief and concise overview, the book covers theory and experiment in equal detail, directly linking the two. The dark energy problem dark energy wiley online library. Galaxy clustering data provide a powerful probe of dark energy. All content in this area was uploaded by xiaoyun wang on nov 12, 2015. Though the concept of a dark energy driven accelerating universe was introduced by the author in 1997, to date dark energy itself, as described below has remained a paradigm.
We should minimize gravitational lensing effect on supernovae. Illuminating dark energy with the joint efficient dark. The full text of this article hosted at is unavailable due to technical difficulties. Dark energy from modi ed friedmann equations yun wang, katherine freesey, paolo gondoloz, and matthew lewisx abstract in the cardassian model, dark energy density arises from modi cations to the friedmann equation, which becomes h2 g. Baryon acoustic oscillations bao in the galaxy power spectrum allows us to extract the scale of the comoving sound horizon at recombination, a cosmological standard ruler accurately determined by the cosmic microwave background anisotropy data. Status report from wfirst sdt galactic plane and general observer task group download. The other possibility is that gr breaks down on cosmological scales and must be replaced with a more complete theory of gravity. In order to test the possible interaction between dark energy and dark matter, we investigate observational constraints on a phenomenological scenario, in which the ratio between the dark energy and matter densities is proportional to the powerlaw case of the scalefactor, r. Yun wang, 32011 at the last scattering of cmb photons, the acoustic oscillations in the photonbaryon fluid became frozen. We study the evolution of galaxy clustering in various cosmological models with quintessence. Dark energy research aims to illuminate the mystery of the observed cosmic acceleration, one of the fundamental problems in physics and astronomy today. Differentiating dark energy and modified gravity with galaxy redshift surveys.
We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services. In quintessence models, the dark energy content of the universe is described by a slowly rolling scalar field whose pressure and energy density obey an equation of state of the form p w w is in general a function of time such that. Physics letters b vol 632, issue 4, pages 449596 19. We propose in this letter a new scenario of dark energy dubbed. In this paper, we study the possibility of building twofield models of dark energy with equation of state across 1. Properties of the dark energy symposium international. Yun wang has developed strategies for optimizing future surveys to probe dark energy, and created a mission concept for the nasadoe joint dark energy mission jdem, the joint efficient dark energy investigation jedi, and served as the principal. Her father was a political dissident and her mother was a teacher. Dark matter and dark energy by michael wang on prezi. Yun wang submitted on 3 sep 2008 v1, last revised 16 dec 2008 this version, v3 abstract. Dark energy and light energy ying yang that creates. She has worked on advancing the methods for interpreting dark energy data, and developing optimal observational strategies for probing the nature of dark energy. I will examine type ia supernovae and galaxy clustering as dark energy.
This book introduces the current state of research on dark energy. The universe appears to be expanding at an accelerating rate, driven by a mechanism called dark energy. Dark matter, dark energy, and the expansion of the universe. Banks and dine argue that all explanations for dark. Yun wang, shuang wang submitted on 16 apr 20 v1, last revised 29 aug 20 this version, v2 abstract. Current observational bounds on dark energy depend on assumptions about the curvature of the universe. Citeseerx document details isaac councill, lee giles, pradeep teregowda. This dictates the measurements that are optimal in unveiling the nature of dark energy. Citeseerx preprint typeset using l atex style emulateapj. Although wang also covers the basic cosmology background and includes a short chapter on models to explain cosmic acceleration, her book focuses much more on the major observational methods for probing dark energy supernovae, largescale structure, weak lensing, and clusters. To determine the nature of dark energy from observational data, it is important that we use modelindependent and optimal methods. We present the distance priors that we have derived from the 2015 planck data, and use these in combination with the latest. Designing a spacebased galaxy redshift survey to probe.
Esas dark energy mission euclid will map the 3d matter distribution in our universe using two dark energy probes. The observed cosmic acceleration today could be due to an unknown energy component dark energy, or a modification to general relativity modified gravity. Pdf discovery potential for the neutral charmoniumlike z 0. Yun wang has developed strategies for optimizing future surveys to probe dark energy, and created a mission concept for the nasadoe joint dark energy mission jdem, the joint efficient dark energy investigation jedi, and served as the principal investigator of jedi. Download citation add to favorites reprints and permissions. She came to the united states for graduate school in physics in 1985 and earned her phd in physics from carnegie mellon university. The european physical society has awarded the the cdf and dzero collaborations with the prestigous 2019 high energy and particle physics prize for the discovery of the top quark and the detailed measurement of its properties. Baryon acoustic oscillations and redshift space distortions subgroup progress report, yun wang download. Present and future evidence for evolving dark energy by andrew r. Dark energy 1st edition by yun wang 2010 english pdf. Dark energy constraints from the cosmic age and supernova. Because these telescopes are looking back in time the fact that the redshift was smaller than expected means that they were moving slower in the past. We examine various issues important in the use of bao to probe dark energy.
Dark energy theory and observations darkenergy,themysteriouscauseoftheacceleratingexpansionoftheuniverse,is one of the most important. It will also provide definitive measurements on dark energy, explore dusty regions of the. Jedi joint efficient dark energy investigation is a candidate implementation of the nasadoe joint dark energy mission jdem. We are indebted to yun wang for enlightening discussions on. Buy yun wang ebooks to read online or download in pdf or epub on your pc, tablet or mobile device. We discuss the arguments that have led physicists and astronomers to accept dark energy as the current preferable candidate to explain the acceleration. Specifically we will consider two classes of models. Dark energy could be an unknown energy component, or a modification of einsteins general relativity. Indispensable for researchers entering this rapidly evolving field.
The extreme accuracy required for both probes can only be achieved by observing from space in order to limit all. Astrophysics cosmology and nongalactic astrophysics. Yun wang, 2282011 observational methods for probing dark energy measure two functions of redshift z. Modelindependent measurements of cosmic expansion and growth. Dark energy search with supernovae, in proceedings of the 6th ucla symposium on dark matter and dark energy, 2004 new dark energy constraints from supernovae, microwave background and galaxy clustering phys.
H02n1100 abstract a power machine based on universal gravitation features use of a special structure to collect energy and use of highintensity magnet whose unused surface has been shielded to limit speed, both of which are combined to generate physical motion. We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Dark matter, dark energy, and the expansion of the universe by michael howard 1032012 type ia supernovae it was discovered that these supernovae had a smaller redshift than would be expected. Gammaray bursts grb are the most energetic events in the universe, and provide a complementary probe of dark energy by allowing the measurement of cosmic expansion history that. Illuminating the nature of dark energy is one of the most important challenges in cosmology today. Baryon acoustic oscillations bao in the galaxy power spectrum allows us to extract the scale of the comoving sound horizon at recombination, a cosmological. Dark energy, yun wang wileyvch, weinheim, germany, 2010. Probing dark energy using its density instead of its equation of state. Discovery potential for the neutral charmoniumlike z 0 4200 by p p annihilation.
Jedi joint efficient darkenergy investigation is a candidate implementation of the nasadoe joint dark energy mission jdem. The first part is for preliminary knowledge, including general relativity, modern cosmology, etc. Although wang also covers the basic cosmology background and includes a short chapter on models to explain cosmic acceleration, her book focuses much more on the major observational methods for probing dark energy supernovae, largescale structure, weak lensing, and. Phys 24 s2007 dark energy 4 sadoulet general relativity 2 energy content geometry in gr, minimum distance path geodesic is not straight we measure the total energy density in terms of the critical density flat universe. Jan 10, 2012 dark energy could be an unknown energy component, or a modification of einsteins general relativity. Dark matter was discovered after the mass of universes seemed to small for gravitational pull scientists hypothesized. We present our method in section 2, our results in section 3, and summarize and conclude in section 4. Dark energy isbn 9783527409419 pdf epub yun wang ebook. We investigate how the analytical predictions vary with change of dark energy equation of state wx. Designing a spacebased galaxy redshift survey to probe dark energy yun wang,1 will percival,2 andrea cimatti,3 pia mukherjee,4 luigi guzzo,5 carlton m.
Observational constraints on dark energy and cosmic. Deng wang and xinhe mengexploring uncertainties in dark energy constraints using current observational data with planck 2015 distance priors yun wang and mi daithis content was downloaded from ip address 157. Robust constraints on dark energy and gravity from. Dark energy constraints from baryon acoustic oscillations. Figure of merit for dark energy constraints from current. Robust constraints on dark energy and gravity from galaxy clustering data. Yun wang is a leading expert in dark energy research, with over thirty refereed publications on this. Observational approaches to understanding dark energy. The cause for the observed acceleration in the expansion of the universe is unknown, and referred to as dark energy for convenience. Exploring uncertainties in dark energy constraints using current. The existence of gravitationally repulsive dark energy would have dramatic consequences for fundamental physics. The observed cosmic acceleration today could be due to an unknown energy component dark energy, or a modification to. Close this message to accept cookies or find out how to manage your cookie settings. She began writing poetry when she was 12, and she majored in physics at tsinghua university when she was 16.
Robust constraints on dark energy and gravity from galaxy. Poet and cosmologist yun wang grew up in rural southwest china. Yun wang is a leading expert in dark energy research, with over thirty refereed publications on this subject. Aug 02, 2014 in this video ill be sharing my understanding from channeling how are dimensions cerated, what is dark energy, what is light energy and how in combinations they can create fisical reality. We should probe dark energy using its density allowed to be a free function of cosmic time instead of its equation of state. This acclaimed book by yun wang is available at in several formats for your ereader. Report of the supernova working group, charles baltay download. The nature of dark energy is largely unknown and needs to be derived from observation of its effects. Liddle, pia mukherjee, david parkinson and yun wang. Lacey, elisabetta majerotto,5 alvaro orsi,6 piero rosati,8 lado samushia2,9 and giovanni zamorani10.
Comparing these predictions against available data we discuss to what extent the problems of galaxy biasing can be modelled. Dark energy by miao li, xiaodong li, shuang wang, yi wang. Miao li1,2, xiaodong li2,3,4, shuang wang5,6, yi wang7,8. This extensive volume, an outgrowth of a topical and tutorial summer school, has been set up with the aim of constituting an advancedlevel, multiauthored textbook which meets the needs of both postgraduate students and young researchers in the fields of modern.
Dark energy wiley online books wiley online library. The university of oklahoma department of physics and astronomy. The nature and essence of dark matter and dark energy have become the central issue in modern cosmology over the past years. Theory of dark energy and dark matter 3 we proceed as follows.