All about Antigravity: 25 very interesting scientific documents

1. arXiv:0904.2394 [ps, pdf, other]
Title: Levitating Dark Matter
Authors: Nemanja Kaloper, Antonio Padilla
Comments: 17 pages LaTeX
Subjects: Cosmology and Extragalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)

2. arXiv:0902.3871 [ps, pdf, other]
Title: Dark energy and the mass of the Local Group
Authors: A.D. Chernin, P. Teerikorpi, M.J. Valtonen, G.G. Byrd, V.P. Dolgachev, L.M. Domozhilova
Comments: 7 pages, 1 figure, submitted to ApJL
Subjects: Cosmology and Extragalactic Astrophysics (astro-ph.CO)

3. arXiv:0901.4055 [ps, pdf, other]
Title: Extended General Relativity: large-scale antigravity and short-scale gravity with \omega=-1 from five dimensional vacuum
Authors: Jose Edgar Madriz Aguilar, Mauricio Bellini
Comments: 7 pages, no figures
Subjects: General Relativity and Quantum Cosmology (gr-qc); Cosmology and Extragalactic Astrophysics (astro-ph.CO); High Energy Physics - Theory (hep-th)

4. arXiv:0811.1008 [ps, pdf, other]
Title: A constraint on antigravity of antimatter from precision spectroscopy of simple atoms
Authors: Savely G. Karshenboim (Max-Planck-Institut fuer Quantenoptik, Garching and D.I. Mendeleev Institute for Metrology, St.Petersburg)
Subjects: General Relativity and Quantum Cosmology (gr-qc); Atomic Physics (physics.atom-ph)
5. arXiv:0811.0522 [pdf]
Title: Primitive Virtual Negative Charge
Authors: Kiyoung Kim
Comments: 33 pages, 8 figures
Subjects: General Physics (physics.gen-ph)

6. arXiv:0803.2864 [pdf]
Title: Exact 'antigravity-field' solutions of Einstein's equation
Authors: Franklin S. Felber
Comments: 3 pages, 3 figures; this version shows correspondence of exact 'antigravity' field, calculated from a metric first derived by Hartle, Thorne, and Price, with weak 'antigravity' fields calculated from retarded potentials in Ref. [2]; also adds impulse calculation
Subjects: General Physics (physics.gen-ph)

7. arXiv:0710.4316 [src]
Title: Can the new Neutrino Telescopes and LHC reveal the gravitational proprieties of antimatter?
Authors: Dragan Slavkov Hajdukovic
Comments: This paper has been withdrawn by the author. Full version replacing partial results is at: arXiv:gr-qc/0612088v2
Subjects: General Relativity and Quantum Cosmology (gr-qc)

8. arXiv:0706.4171 [ps, pdf, other]
Title: Local dark energy: HST evidence from the vicinity of the M 81/M 82 galaxy group
Authors: A.D. Chernin, I.D. Karachentsev, O.G. Kashibadze, D.I. Makarov, P. Teerikorpi, M.J. Valtonen, V.P. Dolgachev, L.M. Domozhilova
Comments: 17 pages, 1 figure
Journal-ref: Astrophys.50:405-415,2007
Subjects: Astrophysics (astro-ph)

9. arXiv:0706.4068 [ps, pdf, other]
Title: Detection of dark energy near the Local Group with the Hubble Space Telescope
Authors: A.D. Chernin, I.D. Karachentsev, P. Teerikorpi, M.J. Valtonen, G.G. Byrd, Yu.N. Efremov, V.P. Dolgachev, L.M. Domozhilova, D.I. Makarov, Yu.V. Baryshev
Comments: 11 pages, 1 figure
Subjects: Astrophysics (astro-ph)

10. arXiv:0704.2753 [ps, pdf, other]
Title: Local dark energy: HST evidence from the expansion flow around Cen A/M83 galaxy group
Authors: A. D. Chernin, I. D. Karachentsev, D. I. Makarov, O. G. Kashibadze, P. Teerikorpi, M. J. Valtonen, V. P. Dolgachev, L. M. Domozhilova
Subjects: Astrophysics (astro-ph)

11. arXiv:gr-qc/0702142 [src]
Title: Concerning production and decay of mini black holes
Authors: Dragan Slavkov Hajdukovic
Comments: This paper has been withdrawn by the author. Full version replacing partial results is at: arXiv:gr-qc/0612088v2
Subjects: General Relativity and Quantum Cosmology (gr-qc)

12. arXiv:gr-qc/0701168 [src]
Title: Antigravity as the basis for a New Interpretation of the Planck Length
Authors: Dragan Slavkov Hajdukovic
Comments: This paper has been withdrawn by the author. Full version replacing partial results is at: arXiv:gr-qc/0612088v2
Subjects: General Relativity and Quantum Cosmology (gr-qc)

13. arXiv:gr-qc/0612088 [pdf]
Title: Black holes, neutrinos and gravitational proprieties of antimatter
Authors: Dragan Slavkov Hajdukovic
Comments: This new version is four times longer than the first one, and consequently contains much more results
Subjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics (astro-ph); High Energy Physics - Theory (hep-th)

14. arXiv:gr-qc/0604076 [ps, pdf, other]
Title: 'Antigravity' Propulsion and Relativistic Hyperdrive
Authors: Frankliln S. Felber
Comments: 4 pages, 4 figures, 2 video clips. To be presented at 25th International Space Development Conference, Los Angeles, 4-7 May 2006
Subjects: General Relativity and Quantum Cosmology (gr-qc)

15. arXiv:astro-ph/0603226 [ps, pdf, other]
Title: Non-Friedmann cosmology for the Local Universe, significance of the universal Hubble constant and short-distance indicators of dark energy
Authors: Arthur D. Chernin, Pekka Teerikorpi, Yurij V. Baryshev
Comments: 10 pages, 1 figure, submitted to A&A
Subjects: Astrophysics (astro-ph)

16. arXiv:astro-ph/0602102 [pdf]
Title: Hubble's law and Superluminity Recession Velocities
Authors: Leonid S. Sitnikov
Comments: 7 pages, 3 figures
Subjects: Astrophysics (astro-ph)

17. arXiv:gr-qc/0602041 [pdf]
Title: Testing existence of antigravity
Authors: Dragan Slavkov Hajdukovic
Subjects: General Relativity and Quantum Cosmology (gr-qc)

18. arXiv:gr-qc/0509105 [ps, pdf, other]
Title: Physics of Gravitational Interaction: Geometry of Space or Quantum Field in Space?
Authors: Yurij Baryshev
Comments: 9 pages, to be published in the Proceedings of the 1st Crisis in Cosmology Conference, AIP proceedings series
Subjects: General Relativity and Quantum Cosmology (gr-qc)

19. arXiv:astro-ph/0506070 [ps, pdf, other]
Title: Co-existence of Gravity and Antigravity: The Unification of Dark Matter and Dark Energy
Authors: Xiang-Song Chen
Comments: 3 pages, no figure; discussions added that low-energy gravitons can also serve as both dark matter and dark energy; references added
Subjects: Astrophysics (astro-ph)

20. arXiv:hep-th/0506067 [ps, pdf, other]
Title: Ultra-large distance modification of gravity from Lorentz symmetry breaking at the Planck scale
Authors: D.S. Gorbunov, S.M. Sibiryakov
Comments: 28 pages
Journal-ref: JHEP 0509 (2005) 082
Subjects: High Energy Physics - Theory (hep-th)

21. arXiv:physics/0506017 [pdf]
Title: Zero-point energy of vacuum fluctuation as a candidate for dark energy versus a new conjecture of antigravity based on the modified Einstein field equation in general relativity
Authors: Guang-jiong Ni
Comments: 11 pages,1 figure
Subjects: General Physics (physics.gen-ph)

22. arXiv:gr-qc/0505099 [ps, pdf, other]
Title: Exact Relativistic 'Antigravity' Propulsion
Authors: F. S. Felber
Comments: 4 pages, 3 figures, changed format only, attached 5 AVI files (animated exact solutions of black holes incident on initially stationary payloads)
Subjects: General Relativity and Quantum Cosmology (gr-qc)

23. arXiv:gr-qc/0505098 [pdf]
Title: Weak 'Antigravity' Fields in General Relativity
Authors: F. S. Felber
Comments: 5 pages, 3 figures, 1 table. Updates include: (1) Large Hadron Collider off-line experiment designed to test relativistic gravity; (2) demonstration that weak 'antigravity' fields correspond with new exact solutions calculated from an exact metric first derived by Hartle, Thorne, and Price
Subjects: General Relativity and Quantum Cosmology (gr-qc)

24. arXiv:gr-qc/0411096 [ps, pdf, other]
Title: The warp drive and antigravity
Authors: Homer G. Ellis
Comments: 6 pages, AMSTeX, 1 Encapsulated PostScript figure
Subjects: General Relativity and Quantum Cosmology (gr-qc)

25. arXiv:gr-qc/0411064 [ps, pdf, other]
Title: Symmetry relating Gravity with Antigravity: A possible resolution of the Cosmological Constant Problem?
Authors: Israel Quiros
Comments: 3 pages, no figures, revtex
Subjects: General Relativity and Quantum Cosmology (gr-qc)

Could Physicists Make A Time Machine? It All Depends On Curving Space-time

Source:

http://www.sciencedaily.com/releases/2007/08/070822164415.htm

Science Daily — Technion researchers have developed a theoretical model of a time machine that, in the distant future, could possibly enable future generations to travel into the past.

“In order to travel back in time, the spacetime structure must be engineered appropriately,” explains Prof. Amos Ori of the Technion’s Faculty of Physics. “This is what Einstein’s theory of general relativity deals with. It says that spacetime can be flat. That is – it has a trivial, simple structure. But it can also be curved with various configurations. According to the theory of relativity, the essence of gravitational fields is in the curving of spacetime. The theory of relativity also defines how space is curved and how this curvature develops over time.”
The main question is: if, according to the principles of curvature development in the theory of relativity, can a time machine be created? In other words, can we cause spacetime to curve in such a way as to enable travel back in time? Such a journey requires a significant curvature of spacetime, in a very special form.
Traveling back in time is actually closing time-like curves so we can go back to an event at which we were present in the past. In flat space, it is not possible to close curves and go back in time. In order for closed time-like curves to exist, there has to be a curvature of a specific form on spacetime.
The question Prof. Ori is investigating is: do the laws of gravity permit the development of spacetime with the required curvature (closed time-like curves)? In the past, scientists raised a number of objections to this possibility. Now, Prof. Ori is proposing a theoretical model for spacetime that could develop into a time machine.
The model overcomes some of the questions, which, until now, scientists have not succeeded in solving. One of the difficult claims against a time machine was that, in order to create a time machine, it would be necessary for it to contain material with negative density. And since we do not have such material – and it is also not clear if the laws of nature enable the existence of such material in the quantities required - it is not possible to build a time machine. Now, Prof. Ori comes along and proposes a theoretical model that does not require material with negative density. The model that he proposes is, essentially, a vacuum space that contains a region field with standard positive density material.
“The machine is spacetime itself,” he explains. “Today, if we were to create a time machine – an area with a warp like this in space that would enable time lines to close on themselves – it might enable future generations to return to visit our time. We, apparently, cannot return to previous ages because our predecessors did not create this infrastructure for us.”
Prof. Ori emphasizes that we still do not have the technology to control gravitational fields at will, despite the fact that the theoretical principles of how to do this exist. “The model that we developed at the Technion is a significant step but there still remains a number of non-trivial open questions,” he stresses. “It may be that some of these questions also will not be solved in the future. This is still not clear.” As an example, he brings up the problem of instability according to which in spacetime with a time machine there could be disturbances with increasing strength so that spacetime would be disrupted to such an extent that it would cancel out the time machine. Prof. Ori, one of the few scientists in the world investigating this issue, hopes that continued research will present a clearer picture with respect to these questions.
An article on this model was published recently in the journal “Physical Review.”
Note: This story has been adapted from a news release issued by Technion, Israel Institute Of Technology.

Fausto intilla

www.oloscience.com