Quantum probe of space-time curvature

Science ◽  
2022 ◽  
Vol 375 (6577) ◽  
pp. 142-143
Author(s):  
Albert Roura
Keyword(s):  
Space Time ◽  
Atom Interferometer ◽  
Time Dilation ◽  
Quantum Phase

An atom interferometer measures the quantum phase due to gravitational time dilation

QUANTUM PHASE TRANSITIONS AND EVENT HORIZONS: CONDENSED MATTER ANALOGIES

2006 ◽  
Vol 20 (19) ◽  
pp. 2647-2650
Author(s):  
GEORGE CHAPLINE
Keyword(s):  
General Relativity ◽  
Phase Transitions ◽  
Event Horizon ◽  
Thought Experiment ◽  
Quantum Phase Transitions ◽  
Martensitic Transformations ◽  
Space Time ◽  
Quantum Phase ◽  
Event Horizons ◽  
Heavy Fermion Materials

Although it has been generally believed that classical general relativity is always correct for macroscopic length scales, certain predictions such as event horizons and closed time-like curves are inconsistent with ordinary quantum mechanics. It has recently been pointed out that the event horizon problem can be resolved if space-time undergoes a quantum phase transition as one approaches the surface where general relativity predicts that the redshift becomes infinite. Indeed a thought experiment involving a superfluid with a critical point makes such a suggestion appear plausible. Furthermore the behavior of space-time near an event horizon may resemble quantum phase transitions that have been observed in the laboratory. For example, the phenomenology of metamagnetic quantum critical points in heavy fermion materials resembles the behavior expected, both in terms of time standing still and the behavior of quantum correlation functions. Martensitic transformations accompanied by non-adiabatic changes in the electronic wave function are also interesting in this connection.

scholarly journals Digital atom interferometer with single particle control on a discretized space-time geometry

2012 ◽  
Vol 109 (25) ◽  
pp. 9770-9774 ◽  
Author(s):  
A. Steffen ◽  
A. Alberti ◽  
W. Alt ◽  
N. Belmechri ◽  
S. Hild ◽  
...  
Keyword(s):  
Single Particle ◽  
Space Time ◽  
Atom Interferometer

scholarly journals Animal-oriented virtual environments: illusion, dilation, and discovery

F1000Research ◽  
2014 ◽  
Vol 3 ◽  
pp. 202
Author(s):  
Bradly Alicea
Keyword(s):  
Virtual Environments ◽  
Brain Activity ◽  
Emotional Valence ◽  
Space Time ◽  
Time Dilation ◽  
Neural Basis ◽  
Future Directions ◽  
And Behavior ◽  
And Training ◽  
Dilate Space

As a research tool, virtual environments (VEs) hold immense promise for brain scientists. Yet to fully realize this potential in non-human systems, theoretical and conceptual perspectives must be developed. When selectively coupled to nervous systems, virtual environments can help us better understand the functional architecture of animals’ brains during naturalistic behaviors. While this will no doubt allow us to further our understanding of the neural basis of behavior, there is also an opportunity to uncover the diversity inherent in brain activity and behavior. This is due to two properties of virtual environments: the ability to create sensory illusions, and the ability to dilate space and/or time. These and other potential manipulations will be characterized as the effects of virtuality. In addition, the systems-level outcomes of virtual environment enhanced perception will be discussed in the context of the uncanny valley and other expected relationships between emotional valence, cognition, and training. These effects and their usefulness for brain science will be understood in the context of three types of neurobehavioral phenomena: sensorimotor integration, spatial navigation, and interactivity. For each of these behaviors, a combination of illusory and space/time dilation examples will be reviewed. Once these examples are presented, the implications for improving upon virtual models for more directly inducing the mental phenomena of illusion and space/time dilation will be considered. To conclude, future directions for integrating the use of VEs into a strategy of broader biological inquiry will be presented.

The Sagnac and Hafele–Keating experiments: Two keys to the understanding of space–time physics in the vicinity of the Earth

2019 ◽  
Vol 34 (33) ◽  
pp. 1930014
Author(s):  
J. H. Field
Keyword(s):  
General Relativity ◽  
Light Propagation ◽  
Theoretical Calculations ◽  
Space Time ◽  
Time Dilation ◽  
Sagnac Effect ◽  
Preferred Frame ◽  
The Earth ◽  
Measured Time

The role of preferred frames for light propagation and time dilation in the region of a massive, spherical, gravitating bodies, where according to general relativity, space–time curvature is described by the Schwarzschild metric equation, is discussed in the context of the Sagnac effect (for light propagation) and the Hafele–Keating experiment (for time dilation). Predictions for both translational and rotational motion relative to the preferred frame are calculated up to order [Formula: see text]. Different published theoretical calculations of the Sagnac effect are critically reviewed. The conflation in the literature of measured time differences in Sagnac experiments (a classical order [Formula: see text] effect) and time dilation (a relativistic order [Formula: see text] effect) are also discussed.

scholarly journals Animal-oriented virtual environments: illusion, dilation, and discovery

F1000Research ◽  
2015 ◽  
Vol 3 ◽  
pp. 202 ◽  
Author(s):  
Bradly Alicea
Keyword(s):  
Virtual Environments ◽  
Brain Activity ◽  
Emotional Valence ◽  
Space Time ◽  
Time Dilation ◽  
Neural Basis ◽  
Future Directions ◽  
And Behavior ◽  
And Training ◽  
Dilate Space

As a research tool, virtual environments (VEs) hold immense promise for brain scientists. Yet to fully realize this potential in non-human systems, theoretical and conceptual perspectives must be developed. When selectively coupled to nervous systems, virtual environments can help us better understand the functional architecture of animals’ brains during naturalistic behaviors. While this will no doubt allow us to further our understanding of the neural basis of behavior, there is also an opportunity to uncover the diversity inherent in brain activity and behavior. This is due to two properties of virtual environments: the ability to create sensory illusions, and the ability to dilate space and/or time. These and other potential manipulations will be characterized as the effects of virtuality. In addition, the systems-level outcomes of virtual environment enhanced perception will be discussed in the context of the uncanny valley and other expected relationships between emotional valence, cognition, and training. These effects and their usefulness for brain science will be understood in the context of three types of neurobehavioral phenomena: sensorimotor integration, spatial navigation, and interactivity. For each of these behaviors, a combination of illusory and space/time dilation examples will be reviewed. Once these examples are presented, the implications for improving upon virtual models for more directly inducing the mental phenomena of illusion and space/time dilation will be considered. To conclude, future directions for integrating the use of VEs into a strategy of broader biological inquiry will be presented.

How to beat time dilation in flat space‐time

1990 ◽  
Vol 58 (11) ◽  
pp. 1108-1109 ◽  
Author(s):  
William D. Sears
Keyword(s):  
Flat Space ◽  
Space Time ◽  
Time Dilation

scholarly journals Derivation of general relativistic gravitational potential energy using principle of equivalence and gravitational time dilation

2021 ◽  
Author(s):  
Biswaranjan Dikshit
Keyword(s):  
General Relativity ◽  
Potential Energy ◽  
Gravitational Potential ◽  
Geometric Theory ◽  
Space Time ◽  
Time Dilation ◽  
Gravitational Potential Energy ◽  
Principle Of Equivalence ◽  
General Relativistic ◽  
Theory Of Gravity

Einstein’s theory of general relativity which has been experimentally proved to be true theory of gravity doesn’t need gravitational potential energy to predict trajectory of particles in space. This is because general relativity is a purely geometric theory. Objects move along the geodesics in the curved space-time. The energy-momentum tensor that warps the space-time as per Einstein’s field equations takes into account only the energy/momentum of matter and radiation. Thus, gravitational potential energy doesn’t come into picture in Einstein’s theory of gravity and its role is taken over by curvature of space-time. However, general relativistically correct expression for gravitational potential energy is required for energy conservation and some energy-based approaches in physics. Conventionally, correct form of gravitational potential energy is derived by using full mathematical formality of general relativity. In this paper, we describe an event by which we derive the same general relativistic expression for gravitational potential energy simply by using the principle of equivalence and gravitational time dilation.

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