FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W3200345489> ?p ?o ?g. }

• W3200345489 abstract "The light-cone of M 4 characterizes the causal structure of Minkowski space in special relativity and is the basic notion of QFTs. In  of GRT,  the light-cone however depends on the metric of space-time. The intuitive view is that in quantum gravity causality becomes somehow fuzzy since there is no unique space-time anymore. What this non-uniqueness means, is not clear. One cannot compare the  causal structure  for different space-times because the light-cones  characterizing them  are in different space-times. If the space-times had common coordinates, the comparison would become possible but one cannot assume this.  Lucien  Hardy proposes what he calls quantum Equivalence Principle. It should be possible at least locally to compare small deformations of space-time metric by finding coordinates in which the light-cone defining the causal structure  co-incide. The TGD based solution is much simpler. Space-times  are identified as  4-surfaces in H = M 4 x CP 2 and subset of preferred coordinate for H - Minkowski coordinates when the M 4 projection of space-time surface is 4-D - provides universal space-time coordinates  and one can compare space-time surfaces and their induced causal structure. In quantum sector the second quantized free spinor fields in H can  be restricted to space-time surface  and define fermionic propagators and causal structure. A closely related experimental finding is that it seems possible to construct  causally indefinite photon states. In quantum switch,  photon beam goes through a spin splitter to form a superposition of  photons going along two paths. At the first path they go through A and then through B having some effect on the photons. At second splitter the order of A and B is changed. After that the beams are superposed and it is found that the photons in a causally indefinite state in the sense that the effects of both AB and BA are superposed. In classical physics this is impossible. In the TGD framework, the configurations AB and BA appearing in quantum switch corresponds to a space-time surface represents a branching of 3-surfaces representing photon propagation to two pieces at beam splitter and recombination back to single 3-surface making it possible for the photon wave functions interfere.  Causal indefiniteness in the proposed sense does not mean that the  direction of the causal arrow as an arrow of time is changed and in TGD framework it is not natural to speak about causal indefiniteness." @default.
• W3200345489 created "2021-09-27" @default.
• W3200345489 creator A5079866489 @default.
• W3200345489 date "2021-06-15" @default.
• W3200345489 modified "2023-09-23" @default.
• W3200345489 title "On the Notion of Causal Indefiniteness in the TGD Framework" @default.
• W3200345489 hasPublicationYear "2021" @default.
• W3200345489 type Work @default.
• W3200345489 sameAs 3200345489 @default.
• W3200345489 citedByCount "0" @default.
• W3200345489 crossrefType "journal-article" @default.
• W3200345489 hasAuthorship W3200345489A5079866489 @default.
• W3200345489 hasConcept C111919701 @default.
• W3200345489 hasConcept C121332964 @default.
• W3200345489 hasConcept C163504300 @default.
• W3200345489 hasConcept C197067312 @default.
• W3200345489 hasConcept C202444582 @default.
• W3200345489 hasConcept C2778572836 @default.
• W3200345489 hasConcept C33332235 @default.
• W3200345489 hasConcept C33923547 @default.
• W3200345489 hasConcept C41008148 @default.
• W3200345489 hasConcept C62520636 @default.
• W3200345489 hasConcept C79464548 @default.
• W3200345489 hasConceptScore W3200345489C111919701 @default.
• W3200345489 hasConceptScore W3200345489C121332964 @default.
• W3200345489 hasConceptScore W3200345489C163504300 @default.
• W3200345489 hasConceptScore W3200345489C197067312 @default.
• W3200345489 hasConceptScore W3200345489C202444582 @default.
• W3200345489 hasConceptScore W3200345489C2778572836 @default.
• W3200345489 hasConceptScore W3200345489C33332235 @default.
• W3200345489 hasConceptScore W3200345489C33923547 @default.
• W3200345489 hasConceptScore W3200345489C41008148 @default.
• W3200345489 hasConceptScore W3200345489C62520636 @default.
• W3200345489 hasConceptScore W3200345489C79464548 @default.
• W3200345489 hasIssue "2" @default.
• W3200345489 hasOpenAccess W3200345489 @default.
• W3200345489 hasRelatedWork W1791445419 @default.
• W3200345489 hasRelatedWork W2009077388 @default.
• W3200345489 hasRelatedWork W2022512422 @default.
• W3200345489 hasRelatedWork W2022952993 @default.
• W3200345489 hasRelatedWork W2088785336 @default.
• W3200345489 hasRelatedWork W2557858496 @default.
• W3200345489 hasRelatedWork W2561402914 @default.
• W3200345489 hasRelatedWork W2736091840 @default.
• W3200345489 hasRelatedWork W2796531104 @default.
• W3200345489 hasRelatedWork W282503697 @default.
• W3200345489 hasRelatedWork W2908409421 @default.
• W3200345489 hasRelatedWork W2921744081 @default.
• W3200345489 hasRelatedWork W2952986477 @default.
• W3200345489 hasRelatedWork W3101830269 @default.
• W3200345489 hasRelatedWork W3101996797 @default.
• W3200345489 hasRelatedWork W3107404604 @default.
• W3200345489 hasRelatedWork W317837966 @default.
• W3200345489 hasRelatedWork W3198729468 @default.
• W3200345489 hasRelatedWork W43602478 @default.
• W3200345489 hasRelatedWork W2590902512 @default.
• W3200345489 hasVolume "12" @default.
• W3200345489 isParatext "false" @default.
• W3200345489 isRetracted "false" @default.
• W3200345489 magId "3200345489" @default.
• W3200345489 workType "article" @default.