Introducing the Dirac-Milne universe
A. Benoit-Lévy,Gabriel Chardin +1 more
TLDR
The Dirac-Milne universe, a matter-antimatter symmetric cosmology, was studied in this paper, where antimatter is supposed to present a negative active gravitational mass.Abstract:
The ΛCDM standard model, although an excellent parametrization of the present cosmological data, contains two as yet unobserved components, dark matter and dark energy, that constitute more than 95% of the Universe. Faced with this unsatisfactory situation, we study an unconventional cosmology, the Dirac-Milne universe, a matter-antimatter symmetric cosmology, in which antimatter is supposed to present a negative active gravitational mass. The main feature of this cosmology is the linear evolution of the scale factor with time, which directly solves the age and horizon problems of a matter-dominated universe. We study the concordance of this model to the cosmological test of type Ia supernovae distance measurements and calculate the theoretical primordial abundances of light elements for this cosmology. We also show that the acoustic scale of the cosmic microwave background naturally emerges at the degree scale despite an open geometry.read more
Citations
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Description and first application of a new technique to measure the gravitational mass of antihydrogen
C. Amole,M. D. Ashkezari,Marcelo Baquero-Ruiz,William Bertsche,Eoin Butler,A. Capra,C. L. Cesar,M. Charlton,Stefan Eriksson,Joel Fajans,T. Friesen,M. C. Fujiwara,D. R. Gill,Andrea Gutierrez,J. S. Hangst,W. N. Hardy,M. E. Hayden,C. A. Isaac,Svante Jonsell,Leonid Kurchaninov,A. Little,Niels Madsen,J. T. K. McKenna,S. Menary,S. C. Napoli,P. J. Nolan,A. Olin,Petteri Pusa,C. Ø. Rasmussen,Francis Robicheaux,E. Sarid,D. M. Silveira,Chukman So,Robert Thompson,D. P. van der Werf,Jonathan Wurtele,Andrey Zhmoginov,A. E. Charman +37 more
TL;DR: A novel direct test methodology is described; it searches for a propensity for antihydrogen atoms to fall downward when released from the ALPHA antiHydrogen trap, and places somewhat tighter bounds on a negative gravitational mass, that is, on antigravity.
Journal ArticleDOI
The GBAR experiment: gravitational behaviour of antihydrogen at rest
P. Perez,Yves Sacquin +1 more
TL;DR: GBAR as mentioned in this paper is a CERN experiment aiming to perform the first measurement of the Earth's gravitational acceleration on antimatter by observing the free-fall of antihydrogen atoms.
Journal ArticleDOI
A unifying theory of dark energy and dark matter: Negative masses and matter creation within a modified ΛCDM framework
Jamie Farnes,Jamie Farnes +1 more
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. The model makes several testable predictions and seems to have the potential to be consistent with observational evidence from distant supernovae, the cosmic microwave background, and galaxy clusters. These findings may imply that negative masses are a real and physical aspect of our Universe, or alternatively may imply the existence of a superseding theory that in some limit can be modelled by effective negative masses. Both cases lead to the surprising conclusion that the compelling puzzle of the dark Universe may have been due to a simple sign error.
Journal ArticleDOI
A Unifying Theory of Dark Energy and Dark Matter: Negative Masses and Matter Creation within a Modified $\Lambda$CDM Framework
TL;DR: In this article, a modified Lambda$CDM cosmological model is proposed to predict the observed distribution of dark matter in galaxies from first principles. But the model is based on the assumption that the universe only contains positive masses and cannot coalesce into light emitting structures.
Journal ArticleDOI
The Gbar project, or how does antimatter fall?
Paul Indelicato,G. Chardin,P. Grandemange,D. Lunney,Vladimir Manea,A. Badertscher,Paolo Crivelli,A. Curioni,A. Marchionni,B. Rossi,André Rubbia,Valery Nesvizhevsky,D. G. Brook-Roberge,P. Comini,P. Debu,P. Dupre,Laszlo Liszkay,Bruno Mansoulie,P. Perez,Jean-Michel Rey,B. Reymond,N. Ruiz,Y. Sacquin,B. Vallage,François Biraben,Pierre Cladé,A. Douillet,Gabriel Dufour,S. Guellati,Laurent Hilico,Astrid Lambrecht,Romain Guérout,Jean-Philippe Karr,F. Nez,Serge Reynaud,Csilla I. Szabo,V.-Q. Tran,J. Trapateau,A. Mohri,Yasunori Yamazaki,M. Charlton,Stefan Eriksson,Niels Madsen,D. P. van der Werf,Naofumi Kuroda,H. A. Torii,Yasuyuki Nagashima,Ferdinand Schmidt-Kaler,Jochen Walz,Sebastian Wolf,Paul-Antoine Hervieux,Giovanni Manfredi,Alexei Voronin,P.Froelich,S. Wronka,M. Staszczak +55 more
TL;DR: The GBAR project as mentioned in this paper proposes to measure the free fall acceleration of neutral antihydrogen atoms in the terrestrial gravitational field by photoionizing them with Be+ ions to a few 10 μ K.
References
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Journal ArticleDOI
Measurements of Omega and Lambda from 42 High-Redshift Supernovae
Saul Perlmutter,Saul Perlmutter,Greg Aldering,Gerson Goldhaber,Gerson Goldhaber,R. A. Knop,Peter Nugent,P. G. Castro,P. G. Castro,Susana E. Deustua,Sebastien Fabbro,Sebastien Fabbro,A. Goobar,A. Goobar,Donald E. Groom,I. M. Hook,I. M. Hook,A. G. Kim,A. G. Kim,A. G. Kim,M. Y. Kim,Julia C. Lee,Julia C. Lee,Nelson J. Nunes,Nelson J. Nunes,Reynald Pain,Reynald Pain,C. R. Pennypacker,C. R. Pennypacker,Robert Quimby,Christopher Lidman,Richard S. Ellis,Mike Irwin,Richard G. McMahon,Pilar Ruiz-Lapuente,Nicholas A. Walton,Bradley E. Schaefer,B. J. Boyle,Alexei V. Filippenko,Thomas Matheson,A. S. Fruchter,Nino Panagia,Nino Panagia,Heidi Jo Newberg,Warrick J. Couch +44 more
TL;DR: In this paper, the mass density, Omega_M, and cosmological-constant energy density of the universe were measured using the analysis of 42 Type Ia supernovae discovered by the Supernova Cosmology project.
Journal ArticleDOI
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
Adam G. Riess,Alexei V. Filippenko,Peter Challis,Alejandro Clocchiatti,Alan H. Diercks,Peter M. Garnavich,R. L. Gilliland,Craig J. Hogan,Saurabh Jha,Robert P. Kirshner,Bruno Leibundgut,Mark M. Phillips,David J Reiss,Brian P. Schmidt,R. A. Schommer,R. Chris Smith,R. Chris Smith,Jason Spyromilio,Christopher W. Stubbs,Nicholas B. Suntzeff,John L. Tonry +20 more
TL;DR: In this article, the authors used spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 " z " 0.62.
Journal ArticleDOI
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
Adam G. Riess,Alexei V. Filippenko,Peter Challis,Alejandro Clocchiattia,Alan H. Diercks,Peter M. Garnavich,R. L. Gilliland,Craig J. Hogan,Saurabh Jha,Robert P. Kirshner,Bruno Leibundgut,Mark M. Phillips,David J Reiss,Brian P. Schmidt,Robert A. Schommer,R. Chris Smith,Jason Spyromilio,Christopher W. Stubbs,Nicholas B. Suntzeff,John L. Tonry +19 more
TL;DR: In this paper, the authors present observations of 10 type Ia supernovae (SNe Ia) between 0.16 0 and 4.0 sigma confidence levels, for two fitting methods respectively.
Journal ArticleDOI
Measurements of Omega and Lambda from 42 High-Redshift Supernovae
Saul Perlmutter,Greg Aldering,G. Goldhaber,R. A. Knop,Peter Nugent,P. G. Castro,Susana E. Deustua,Sebastien Fabbro,A. Goobar,D. E. Groom,I. M. Hook,A. G. Kim,M. Y. Kim,Julia C. Lee,Nelson J. Nunes,Reynald Pain,C. R. Pennypacker,R. M. Quimby,C. Lidman,Richard S. Ellis,Michael G. Irwin,Richard G. McMahon,P. Ruiz-Lapuente,Nicholas A. Walton,Bradley E. Schaefer,B. J. Boyle,Alexei V. Filippenko,Thomas Matheson,A. S. Fruchter,Nino Panagia,Heidi Jo Newberg,W. J. Couch +31 more
TL;DR: In this paper, the mass density, Omega_M, and cosmological-constant energy density of the universe were measured by the analysis of 42 Type Ia supernovae discovered by the Supernova Cosmology Project.
Journal ArticleDOI
Seven-year wilkinson microwave anisotropy probe (wmap *) observations: cosmological interpretation
Eiichiro Komatsu,Kristine M. Smith,Jo Dunkley,Charles L. Bennett,B. Gold,Gary Hinshaw,Norman Jarosik,Davin Larson,M. R. Nolta,Lyman A. Page,David N. Spergel,Mark Halpern,Robert S. Hill,A. Kogut,Michele Limon,S. S. Meyer,N. Odegard,Gregory S. Tucker,Janet Weiland,Edward J. Wollack,Edward L. Wright +20 more
TL;DR: In this article, a combination of seven-year data from WMAP and improved astrophysical data rigorously tests the standard cosmological model and places new constraints on its basic parameters and extensions.
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Description and first application of a new technique to measure the gravitational mass of antihydrogen
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Proposed antimatter gravity measurement with an antihydrogen beam
Alban Kellerbauer,M. Amoretti,A. S. Belov,Germano Bonomi,I. Boscolo,R. S. Brusa,Matthias Büchner,Vsevolod M. Byakov,L. Cabaret,Carlo Canali,C. Carraro,Fabrizio Castelli,Simone Cialdi,M. de Combarieu,Daniel Comparat,Giovanni Consolati,Nikolay Djourelov,Michael Doser,G. Drobychev,Alfredo Dupasquier,Gabriele Ferrari,P. Forget,L. Formaro,Antonella Gervasini,Marco Giammarchi,Sergei Gninenko,Gleb Gribakin,S. D. Hogan,Marion Jacquey,V. Lagomarsino,G. Manuzio,Sebastiano Mariazzi,Viktor Matveev,J. O. Meier,Frédéric Merkt,P. Nedelec,Markus K. Oberthaler,P. Pari,Marco Prevedelli,Fiorenza Quasso,Alberto Rotondi,D. Sillou,Sergey V. Stepanov,H. H. Stroke,G. Testera,Guglielmo M. Tino,G. Trénec,Antonio Vairo,Jacques Vigué,H. R. J. Walters,U. Warring,Sandra Zavatarelli,D. S. Zvezhinskij +52 more