A Unifying Theory of Dark Energy, Dark Matter, and Baryonic Matter in the Positive-Negative Mass Universe Pair: Protogalaxy and Galaxy Evolutions
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Cosmicflows-3: Cosmography of the Local Void
Draft version May 22, 2019 Preprint typeset using LATEX style AASTeX6 v. 1.0 COSMICFLOWS-3: COSMOGRAPHY OF THE LOCAL VOID R. Brent Tully, Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA Daniel Pomarede` Institut de Recherche sur les Lois Fondamentales de l'Univers, CEA, Universite' Paris-Saclay, 91191 Gif-sur-Yvette, France Romain Graziani University of Lyon, UCB Lyon 1, CNRS/IN2P3, IPN Lyon, France Hel´ ene` M. Courtois University of Lyon, UCB Lyon 1, CNRS/IN2P3, IPN Lyon, France Yehuda Hoffman Racah Institute of Physics, Hebrew University, Jerusalem, 91904 Israel Edward J. Shaya University of Maryland, Astronomy Department, College Park, MD 20743, USA ABSTRACT Cosmicflows-3 distances and inferred peculiar velocities of galaxies have permitted the reconstruction of the structure of over and under densities within the volume extending to 0:05c. This study focuses on the under dense regions, particularly the Local Void that lies largely in the zone of obscuration and consequently has received limited attention. Major over dense structures that bound the Local Void are the Perseus-Pisces and Norma-Pavo-Indus filaments sepa- rated by 8,500 km s−1. The void network of the universe is interconnected and void passages are found from the Local Void to the adjacent very large Hercules and Sculptor voids. Minor filaments course through voids. A particularly interesting example connects the Virgo and Perseus clusters, with several substantial galaxies found along the chain in the depths of the Local Void. The Local Void has a substantial dynamical effect, causing a deviant motion of the Local Group of 200 − 250 km s−1. -
Modelling the Size Distribution of Cosmic Voids
Alma Mater Studiorum | Universita` di Bologna SCUOLA DI SCIENZE Corso di Laurea Magistrale in Astrofisica e Cosmologia Dipartimento di Fisica e Astronomia Modelling the size distribution of Cosmic Voids Tesi di Laurea Magistrale Candidato: Relatore: Tommaso Ronconi Lauro Moscardini Correlatori: Marco Baldi Federico Marulli Sessione I Anno Accademico 2015-2016 Contents Contentsi Introduction vii 1 The cosmological framework1 1.1 The Friedmann-Robertson-Walker metric...............2 1.1.1 The Hubble Law and the reddening of distant objects....4 1.1.2 Friedmann Equations......................5 1.1.3 Friedmann Models........................6 1.1.4 Flat VS Curved Universes....................8 1.2 The Standard Cosmological Model...................9 1.3 Jeans Theory and Expanding Universes................ 12 1.3.1 Instability in a Static Universe................. 13 1.3.2 Instability in an Expanding Universe.............. 14 1.3.3 Primordial Density Fluctuations................ 15 1.3.4 Non-Linear Evolution...................... 17 2 Cosmic Voids in the large scale structure 19 2.1 Spherical evolution............................ 20 2.1.1 Overdensities........................... 23 2.1.2 Underdensities.......................... 24 2.2 Excursion set formalism......................... 26 2.2.1 Press-Schechter halo mass function and exstension...... 29 2.3 Void size function............................. 31 2.3.1 Sheth and van de Weygaert model............... 33 2.3.2 Volume conserving model (Vdn)................ 35 2.4 Halo bias................................. 36 3 Methods 38 3.1 CosmoBolognaLib: C++ libraries for cosmological calculations... 38 3.2 N-body simulations............................ 39 3.2.1 The set of cosmological simulations............... 40 3.3 Void Finders............................... 42 3.4 From centres to spherical non-overlapped voids............ 43 3.4.1 Void centres........................... -
Undergraduate Thesis on Supermassive Black Holes
Into the Void: Mass Function of Supermassive Black Holes in the local universe A Thesis Presented to The Division of Mathematics and Natural Sciences Reed College In Partial Fulfillment of the Requirements for the Degree Bachelor of Arts Farhanul Hasan May 2018 Approved for the Division (Physics) Alison Crocker Acknowledgements Writing a thesis is a long and arduous process. There were times when it seemed further from my reach than the galaxies I studied. It’s with great relief and pride that I realize I made it this far and didn’t let it overpower me at the end. I have so many people to thank in very little space, and so much to be grateful for. Alison, you were more than a phenomenal thesis adviser, you inspired me to believe that Astro is cool. Your calm helped me stop freaking out at the end of February, when I had virtually no work to show for, and a back that ached with every step I took. Thank you for pushing me forward. Working with you in two different research projects were very enriching experiences, and I appreciate you not giving up on me, even after all the times I blanked on how to proceed forward. Thank you Johnny, for being so appreciative of my work, despite me bringing in a thesis that I myself barely understood when I brought it to your table. I was overjoyed when I heard you wanted to be on my thesis board! Thanks to Reed, for being the quirky, intellectual community that it prides itself on being. -
A Unifying Theory of Dark Energy and Dark Matter: Negative Masses and Matter Creation Within a Modified ΛCDM Framework J
Astronomy & Astrophysics manuscript no. theory_dark_universe_arxiv c ESO 2018 November 5, 2018 A unifying theory of dark energy and dark matter: Negative masses and matter creation within a modified ΛCDM framework J. S. Farnes1; 2 1 Oxford e-Research Centre (OeRC), Department of Engineering Science, University of Oxford, Oxford, OX1 3QG, UK. e-mail: [email protected]? 2 Department of Astrophysics/IMAPP, Radboud University, PO Box 9010, NL-6500 GL Nijmegen, the Netherlands. Received February 23, 2018 ABSTRACT Dark energy and dark matter constitute 95% of the observable Universe. Yet the physical nature of these two phenomena remains a mystery. Einstein suggested a long-forgotten solution: gravitationally repulsive negative masses, which drive cosmic expansion and cannot coalesce into light-emitting structures. However, contemporary cosmological results are derived upon the reasonable assumption that the Universe only contains positive masses. By reconsidering this assumption, I have constructed a toy model which suggests that both dark phenomena can be unified into a single negative mass fluid. The model is a modified ΛCDM cosmology, and indicates that continuously-created negative masses can resemble the cosmological constant and can flatten the rotation curves of galaxies. The model leads to a cyclic universe with a time-variable Hubble parameter, potentially providing compatibility with the current tension that is emerging in cosmological measurements. In the first three-dimensional N-body simulations of negative mass matter in the scientific literature, this exotic material naturally forms haloes around galaxies that extend to several galactic radii. These haloes are not cuspy. The proposed cosmological model is therefore able to predict the observed distribution of dark matter in galaxies from first principles. -
Topology of Large Scale Under-Dense Regions
MNRAS 000,1{12 () Preprint 9 September 2018 Compiled using MNRAS LATEX style file v3.0 Topology of large scale under-dense regions A. M. So ltan? Nicolaus Copernicus Astronomical Centre, Polish Academy of Science, Bartycka 18, 00-716 Warsaw, Poland Accepted . Received ; in original form ABSTRACT We investigate the large scale matter distribution adopting QSOs as matter tracer. The quasar catalogue based on the SDSS DR7 is used. The void finding algorithm is presented and statistical properties of void sizes and shapes are determined. Number of large voids in the quasar distribution is greater than the number of the same size voids found in the random distribution. The largest voids with diameters exceeding 300 Mpc indicate an existence of comparable size areas of lower than the average matter density. No void-void space correlations have been detected, and no larger scale deviations from the uniform distribution are revealed. The average CMB temperature in the directions of the largest voids is lower than in the surrounding areas by 0:0046 ± 0:0028 mK. This figure is compared to the amplitude of the expected temperature depletion caused by the Integrated Sachs-Wolfe effect. Key words: Large-scale structure of universe { cosmic background radiation { quasars: general. 1 INTRODUCTION voluminous data sets with low observational selection bias (e.g. Croom et al. 2001, see below). Clustering properties of Statistical characteristics of matter distribution depend on quasars and galaxies are not distinctly different at small and a number of cosmological parameters. Albeit structures on medium scales (see Ross et al. 2009), what assures us that at various scales carry the information of cosmological rele- scales of several hundreds Mpc quasar distribution is repre- vance, matter agglomerations on the largest scales attract sentative for the luminous matter distribution. -
Can Mass Be Negative?
Can Mass Be Negative? Vladik Kreinovich1 and Sergei Soloviev2 1Department of Computer Science University of Texas at El Paso El Paso, TX 7996058, USA [email protected] 2Institut de Recherche en Informatique de Toulouse (IRIT) IRIT, porte 426 118 route de Narbonne 31062 Toulouse cedex 4, France [email protected] Abstract Overcoming the force of gravity is an important part of space travel and a significant obstacle preventing many seemingly reasonable space travel schemes to become practical. Science fiction writers like to imagine materials that may help to make space travel easier. Negative mass { supposedly causing anti-gravity { is one of the popular ideas in this regard. But can mass be negative? In this paper, we show that negative masses are not possible { their existence would enable us to create energy out of nothing, which contradicts to the energy conservation law. 1 Formulation of the Problem Overcoming the force of gravity is an important part of space travel and a significant obstacle preventing many seemingly reasonable space travel schemes to become practical. Science fiction writers like to imagine materials that may help to make space travel easier. Negative mass { supposedly causing anti- gravity { is one of the popular ideas in this regard. But can mass be negative? 2 Reminder: There Are Different Types of Masses To properly answer the question of whether negative masses are possible, it is important to take into account that there are, in principle, three types of masses: 1 • inertial mass mI that describes how an object reacts to a force F : the object's acceleration a is determined by Newton's law mI · a = F ; and • active and passive gravitational mass mA and mP : gravitation force ex- erted by Object 1 with active mass m on Object 2 with passive mass m · m A1 m is equal to F = G · A1 P 2 ; where r is the distance between the P 2 r2 two objects; see, e.g., [1, 3]. -
And Ecclesiastical Cosmology
GSJ: VOLUME 6, ISSUE 3, MARCH 2018 101 GSJ: Volume 6, Issue 3, March 2018, Online: ISSN 2320-9186 www.globalscientificjournal.com DEMOLITION HUBBLE'S LAW, BIG BANG THE BASIS OF "MODERN" AND ECCLESIASTICAL COSMOLOGY Author: Weitter Duckss (Slavko Sedic) Zadar Croatia Pусскй Croatian „If two objects are represented by ball bearings and space-time by the stretching of a rubber sheet, the Doppler effect is caused by the rolling of ball bearings over the rubber sheet in order to achieve a particular motion. A cosmological red shift occurs when ball bearings get stuck on the sheet, which is stretched.“ Wikipedia OK, let's check that on our local group of galaxies (the table from my article „Where did the blue spectral shift inside the universe come from?“) galaxies, local groups Redshift km/s Blueshift km/s Sextans B (4.44 ± 0.23 Mly) 300 ± 0 Sextans A 324 ± 2 NGC 3109 403 ± 1 Tucana Dwarf 130 ± ? Leo I 285 ± 2 NGC 6822 -57 ± 2 Andromeda Galaxy -301 ± 1 Leo II (about 690,000 ly) 79 ± 1 Phoenix Dwarf 60 ± 30 SagDIG -79 ± 1 Aquarius Dwarf -141 ± 2 Wolf–Lundmark–Melotte -122 ± 2 Pisces Dwarf -287 ± 0 Antlia Dwarf 362 ± 0 Leo A 0.000067 (z) Pegasus Dwarf Spheroidal -354 ± 3 IC 10 -348 ± 1 NGC 185 -202 ± 3 Canes Venatici I ~ 31 GSJ© 2018 www.globalscientificjournal.com GSJ: VOLUME 6, ISSUE 3, MARCH 2018 102 Andromeda III -351 ± 9 Andromeda II -188 ± 3 Triangulum Galaxy -179 ± 3 Messier 110 -241 ± 3 NGC 147 (2.53 ± 0.11 Mly) -193 ± 3 Small Magellanic Cloud 0.000527 Large Magellanic Cloud - - M32 -200 ± 6 NGC 205 -241 ± 3 IC 1613 -234 ± 1 Carina Dwarf 230 ± 60 Sextans Dwarf 224 ± 2 Ursa Minor Dwarf (200 ± 30 kly) -247 ± 1 Draco Dwarf -292 ± 21 Cassiopeia Dwarf -307 ± 2 Ursa Major II Dwarf - 116 Leo IV 130 Leo V ( 585 kly) 173 Leo T -60 Bootes II -120 Pegasus Dwarf -183 ± 0 Sculptor Dwarf 110 ± 1 Etc. -
Negative Matter, Repulsion Force, Dark Matter, Phantom And
Negative Matter, Repulsion Force, Dark Matter, Phantom and Theoretical Test Their Relations with Inflation Cosmos and Higgs Mechanism Yi-Fang Chang Department of Physics, Yunnan University, Kunming, 650091, China (e-mail: [email protected]) Abstract: First, dark matter is introduced. Next, the Dirac negative energy state is rediscussed. It is a negative matter with some new characteristics, which are mainly the gravitation each other, but the repulsion with all positive matter. Such the positive and negative matters are two regions of topological separation in general case, and the negative matter is invisible. It is the simplest candidate of dark matter, and can explain some characteristics of the dark matter and dark energy. Recent phantom on dark energy is namely a negative matter. We propose that in quantum fluctuations the positive matter and negative matter are created at the same time, and derive an inflation cosmos, which is created from nothing. The Higgs mechanism is possibly a product of positive and negative matter. Based on a basic axiom and the two foundational principles of the negative matter, we research its predictions and possible theoretical tests, in particular, the season effect. The negative matter should be a necessary development of Dirac theory. Finally, we propose the three basic laws of the negative matter. The existence of four matters on positive, opposite, and negative, negative-opposite particles will form the most perfect symmetrical world. Key words: dark matter, negative matter, dark energy, phantom, repulsive force, test, Dirac sea, inflation cosmos, Higgs mechanism. 1. Introduction The speed of an object surrounded a galaxy is measured, which can estimate mass of the galaxy. -
The Aspen–Amsterdam Void Finder Comparison Project
University of Groningen The Aspen-Amsterdam void finder comparison project Colberg, Joerg M.; Pearce, Frazer; Foster, Caroline; Platen, Erwin; Brunino, Riccardo; Neyrinck, Mark; Basilakos, Spyros; Fairall, Anthony; Feldman, Hume; Gottloeber, Stefan Published in: Monthly Notices of the Royal Astronomical Society DOI: 10.1111/j.1365-2966.2008.13307.x IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below. Document Version Publisher's PDF, also known as Version of record Publication date: 2008 Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Colberg, J. M., Pearce, F., Foster, C., Platen, E., Brunino, R., Neyrinck, M., ... van de Weygaert, R. (2008). The Aspen-Amsterdam void finder comparison project. Monthly Notices of the Royal Astronomical Society, 387(2), 933-944. https://doi.org/10.1111/j.1365-2966.2008.13307.x Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons). Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. -
Can We Make Traversable Wormholes in Spacetime?
[First published in Foundations of Physics Letters 10, 153 – 181 (1997). Typographical errors in the original have been corrected.] TWISTS OF FATE: CAN WE MAKE TRAVERSABLE WORMHOLES IN SPACETIME? James F. Woodward Departments of History and Physics California State University Fullerton, California 92634 The scientific reasons for trying to make traversable wormholes are briefly reviewed. Methods for making wormholes employing a Machian transient mass fluctuation are examined. Several problems one might encounter are mentioned. They, however, may just be engineering difficulties. The use of "quantum inequalities" to constrain the existence of negative mass-energy required in wormhole formation is briefly examined. It is argued that quantum inequalities do not prohibit the formation of artificial concentrations of negative mass-energy. Key Words: wormholes, exotic matter, Mach's principle, general relativity, time travel. I. INTRODUCTION "Tunnels Through Spacetime: Can We Build A Wormhole?" Such was the title of the cover story of the 23 March 1996 issue of New Scientist. In that story M. Chown reported on recent developments in wormhole physics, especially work that was stimulated by a NASA sponsored 1 conference held at the Jet Propulsion Laboratory in Pasadena on 16 to 17 May 1994 [Cramer, et al., 1995] and a proposal for the induction of wormholes based on strong magnetic fields [Maccone, 1995]. The tone of the article is serious throughout. Not so the proximate previous article on wormholes wherein I. Stewart [1994] related the efforts of Amanda Banda Gander, sales rep for Hawkthorne Wheelstein, Chartered Relativists, to sell Santa various exotic devices to facilitate his delivery schedule. This delightful piece culminates with the cumulative audience paradox -- gnomes piling up at the nativity -- and its resolution in terms of the Many Worlds interpretation of quantum mechanics. -
The Analysis of Harold White Applied to the Natario Warp Drive Spacetime
The Analysis of Harold White applied to the Natario Warp Drive Spacetime. From 10 times the mass of the Universe to arbitrary low levels of negative energy density using a continuous Natario shape function with power factors.Warp Drives with two warped regions Fernando Loup To cite this version: Fernando Loup. The Analysis of Harold White applied to the Natario Warp Drive Spacetime. From 10 times the mass of the Universe to arbitrary low levels of negative energy density using a continuous Natario shape function with power factors.Warp Drives with two warped regions. 2013. hal-00844801 HAL Id: hal-00844801 https://hal.archives-ouvertes.fr/hal-00844801 Submitted on 15 Jul 2013 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. The Analysis of Harold White applied to the Natario Warp Drive Spacetime. From 10 times the mass of the Universe to arbitrary low levels of negative energy density using a continuous Natario shape function with power factors.Warp Drives with two warped regions Fernando Loup ∗ Residencia de Estudantes Universitas Lisboa Portugal July 15, 2013 Abstract Warp Drives are solutions of the Einstein Field Equations that allows superluminal travel within the framework of General Relativity. -
Cosmic Variance of $ Z> 7$ Galaxies: Prediction from Bluetides
MNRAS 000, 000{000 (0000) Preprint 30 June 2020 Compiled using MNRAS LATEX style file v3.0 Cosmic variance of z > 7 galaxies: Prediction from BlueTides Aklant K. Bhowmick1, Rachel S. Somerville2;3, Tiziana Di Matteo1, Stephen Wilkins4, Yu Feng 5, Ananth Tenneti1 1McWilliams Center for Cosmology, Dept. of Physics, Carnegie Mellon University, Pittsburgh PA 15213, USA 2Center for Computational Astrophysics, Flatiron institute, New York, NY 10010, USA 3Department of Physics and Astronomy, Rutgers University, 136 4Astronomy Centre, Department of Physics and Astronomy, University of Sussex, Brighton, BN1 9QH, UK 5Berkeley Center for Cosmological Physics, University of California at Berkeley, Berkeley, CA 94720, USA 30 June 2020 ABSTRACT In the coming decade, a new generation of telescopes, including JWST and WFIRST, will probe the period of the formation of first galaxies and quasars, and open up the last frontier for structure formation. Recent simulations as well as observations have suggested that these galaxies are strongly clustered (with large scale bias & 6), and therefore have significant cosmic variance. In this work, we use BlueTides, the largest volume cosmological simulation of galaxy formation, to directly estimate the cosmic variance for current and upcoming surveys. Given its resolution and volume, BlueTides can probe the bias and cosmic variance of z > 7 galaxies between mag- 2 2 nitude MUV ∼ −16 to MUV ∼ −22 over survey areas ∼ 0:1 arcmin to ∼ 10 deg . Within this regime, the cosmic variance decreases with survey area/ volume as a power law with exponents between ∼ −0:25 to ∼ −0:45. For the planned 10 deg2 field of WFIRST, the cosmic variance is between 3% to 10%.