Topological censorship and chronology protection

Friedman, John L.; Higuchi, Atsushi

doi:10.1002/andp.200510172

Cited by 21 publications

(22 citation statements)

References 128 publications

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“…The new view of time presented by this model also discounts any possibility of closed timelike curves (a subject of ongoing debate: Hawking, 1992;Sushkov, 1995;Bonnor, 2003;Friedman and Higuchi, 2006). Threats to causality from any future scientific or technological developments are thus nonexistent from this perspective.…”

Section: Introductionmentioning

confidence: 92%

Elementary sub‐atomic particles: the earliest adaptive systems

Blackwell¹

2011

Kybernetes

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Purpose -This paper considers a perspective on particulate matter as being formed from closed loops of waveform energy flow, consistent with observations by de Broglie, Schrödinger and others and supported by recent research findings. It demonstrates that all experimentally verified findings of special relativity may be derived directly from such a model. It further shows a clear form of auto-adaptive behaviour exhibited by such structures. Design/methodology/approach -A generalised closed-loop energy flow model is analysed from first principles. Findings -Motion-dependent time dilation, invariance of the measured speed of light, the Lorentz transformation, mass-energy equivalence (E ¼ mc 2 ) and speed-related increase in apparent mass all follow naturally from this structure. Given this view of matter objective invariance of the speed of light relative to all inertial states of motion is an unnecessary and insupportable assumption. A unique objective rest frame (subject to Hubble expansion of space) is identified. All elementary sub-atomic particles owe their longevity to a non-destructive state-change response to energy input, referred to as "motion". A radically new perspective on time is presented. A possible causal explanation for particle-antiparticle asymmetry is identified. Research limitations/implications -Closed timelike curves are not a possibility. Further implications for all fields of physics are very extensive. Practical implications -There is no conflict between superluminal technologies and causality. Over and above this, possible practical implications are too extensive to be enumerated. Originality/value -The paper is totally original and of significant potential value in various respects.

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Section: Introductionmentioning

confidence: 92%

Elementary sub‐atomic particles: the earliest adaptive systems

Blackwell¹

2011

Kybernetes

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“…For recent empirical limits on global rotation based on the cosmic microwave background radiation, see, for example, Kogut et al (1997). 32 As Sheldon Smith pointed out to us, if this is taken to be Gödel's main argument then it is not clear why the mere existence of Minkowski spacetime, regarded as a vacuum solution of the field equations, does not suffice. Why did Gödel need to go to the effort of discovering the rotating model granted that there is no distinguished absolute time in Minkowski spacetime?…”

Section: Implications Of Time Travelmentioning

confidence: 99%

“…Note that the main use of topological censorship in the physics literature is proving results regarding the topology of black holes; see Friedman and Higuchi (2006) for further discussion and references.…”

Section: Censorship Theoremsmentioning

confidence: 99%

Time Travel and Time Machines

Smeenk

Wüthrich

2011

Oxford Handbooks Online

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This paper is an enquiry into the logical, metaphysical, and physical possibility of time travel understood in the sense of the existence of closed worldlines that can be traced out by physical objects. We argue that none of the purported paradoxes rule out time travel either on grounds of logic or metaphysics. More relevantly, modern spacetime theories such as general relativity seem to permit models that feature closed worldlines. We discuss, in the context of Gödel's infamous argument for the ideality of time based on his eponymous spacetime, what this apparent physical possibility of time travel means. Furthermore, we review the recent literature on so-called time machines, i.e., of devices that produce closed worldlines where none would have existed otherwise. Finally, we investigate what the implications of the quantum behaviour of matter for the possibility of time travel might be and explicate in what sense time travel might be possible according to leading contenders for full quantum theories of gravity such as string theory and loop quantum gravity.

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“…A number of theorems restrict the conditions under which horizons can have toroidal topology; for instance, the torus must close up fast enough so that no light ray from past null infinity can pass through the torus and reach future null infinity [7,8]. Additionally, it has been conjectured that for all toroidal horizons, a new spacetime foliation can be chosen so that the intersection of the horizon with each slice of the foliation has spherical topology [8].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, it has been conjectured that for all toroidal horizons, a new spacetime foliation can be chosen so that the intersection of the horizon with each slice of the foliation has spherical topology [8].…”

Section: Introductionmentioning

confidence: 99%

Toroidal horizons in binary black hole inspirals

2012

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We examine the structure of the event horizon for numerical simulations of two black holes that begin in a quasicircular orbit, inspiral, and finally merge. We find that the spatial cross section of the merged event horizon has spherical topology (to the limit of our resolution), despite the expectation that generic binary black hole mergers in the absence of symmetries should result in an event horizon that briefly has a toroidal cross section. Using insight gained from our numerical simulations, we investigate how the choice of time slicing affects both the spatial cross section of the event horizon and the locus of points at which generators of the event horizon cross. To ensure the robustness of our conclusions, our results are checked at multiple numerical resolutions. 3D visualization data for these resolutions are available for public access online. We find that the structure of the horizon generators in our simulations is consistent with expectations, and the lack of toroidal horizons in our simulations is due to our choice of time slicing.

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Topological censorship and chronology protection

Cited by 21 publications

References 128 publications

Elementary sub‐atomic particles: the earliest adaptive systems

Elementary sub‐atomic particles: the earliest adaptive systems

Time Travel and Time Machines

Toroidal horizons in binary black hole inspirals

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