Arrow of Causality and Quantum Gravity.

08:00 EDT 25th October 2019 | BioPortfolio

Summary of "Arrow of Causality and Quantum Gravity."

Causality in quantum field theory is defined by the vanishing of field commutators for spacelike separations. However, this does not imply a direction for causal effects. Hidden in our conventions for quantization is a connection to the definition of an arrow of causality, i.e., what is the past and what is the future. If we mix quantization conventions within the same theory, we get a violation of microcausality. In such a theory with mixed conventions, the dominant definition of the arrow of causality is determined by the stable states. In some quantum gravity theories, such as quadratic gravity and possibly asymptotic safety, such a mixed causality condition occurs. We discuss some of the implications.


Journal Details

This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 171601


DeepDyve research library

PubMed Articles [2023 Associated PubMed Articles listed on BioPortfolio]

Characterizing a Statistical Arrow of Time in Quantum Measurement Dynamics.

In both thermodynamics and quantum mechanics, the arrow of time is characterized by the statistical likelihood of physical processes. We characterize this arrow of time for the continuous quantum meas...

Weak Gravity Conjecture from Unitarity and Causality.

The weak gravity conjecture states that quantum gravity theories have to contain a charged state with a charge-to-mass ratio bigger than unity. By studying unitarity and causality constraints on highe...

Causal Limit on Quantum Communication.

The capacity of a channel is known to be equivalent to the highest rate at which it can generate entanglement. Analogous to entanglement, the notion of a causality measure characterizes the temporal a...

Quantum Computation as Gravity.

We formulate Nielsen's geometric approach to circuit complexity in the context of two-dimensional conformal field theories, where series of conformal transformations are interpreted as "unitary circui...

Satellite testing of a gravitationally induced quantum decoherence model.

Quantum mechanics and the general theory of relativity are two pillars of modern physics. However, a coherent unified framework of the two theories remains an open problem. Attempts to quantize genera...

Clinical Trials [165 Associated Clinical Trials listed on BioPortfolio]

Safety and Performance of Miami InnFocus Drainage Implant (MIDI Arrow) Glaucoma Drainage Implant

To assess the safety and performance of the MIDI Arrow in patients suffering from glaucoma that is inadequately controlled on maximum tolerated medical therapy with intraocular pressure ...

Personalized Quantum Sonotherapy in Regional Anesthesia

The objetive of the study is to evaluate the effect of personalized quantum sonotherapy on the level of anxiety and pain in outpatients schedule for orthopedic surgery under regional anest...

Arrow Chloragard Peripherally-Inserted Central Catheters (PICC) Study

A prospective study evaluating the timing, incidence and relationship of commonly occurring complications related to the use of peripherally-inserted central catheters. All subjects will r...

Intramedullary Fixation of Humerus Fractures Without Intramedullary Reaming

The purpose of the study is to evaluate the safety and efficacy of the composite Nail - the Quantum interlocking intramedullary nailing system in the reduction of humeral fractures.

Postoperative Rehabilitation After Knee Arthroplasty: Anti-Gravity Treadmill

The aim of this study is to clarify the effectiveness and the usefulness of the anti-gravity treadmill in postoperative rehabilitation after knee arthroplasty. The investigators will compa...

Medical and Biotech [MESH] Definitions

Nanometer sized fragments (the dots) of semiconductor crystalline material which emit PHOTONS. The wavelength is based on the quantum confinement size of the dot. They are brighter and more persistent than organic chemical INDICATORS. They can be embedded in MICROBEADS for high throughput ANALYTICAL CHEMISTRY.

Process whereby a cell, bodily structure, or organism (animal or plant) receives or detects a gravity stimulus. Gravity sensing plays an important role in the directional growth and development of an organism (GRAVITROPISM).

Condition under normal Earth gravity where the force of gravity itself is not actually altered but its influence or effect may be modified and studied. (From ASGSB Bull 1992;5(2):27)

Condition in which no acceleration, whether due to gravity or any other force, can be detected by an observer within a system. It also means the absence of weight or the absence of the force of gravity acting on a body. Microgravity, gravitational force between 0 and 10 -6 g, is included here. (From NASA Thesaurus, 1988)

A plant genus of the family MORACEAE. Members have been used as an arrow poison.

Quick Search

DeepDyve research library

Searches Linking to this Article