Related Experiment Video
Updated: Oct 14, 2025
08:04
Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature
Published on: November 26, 2019
7.3K
Matter-Driven Change of Spacetime Topology
J Ambjørn1, Z Drogosz2, J Gizbert-Studnicki2
1The Niels Bohr Institute, Copenhagen University, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark.
Physical Review Letters
|November 1, 2021
Summary
Scalar fields can alter the topology of quantum universes. Simulations show a phase transition that may simplify complex topologies in early universe models.
Area of Science:
- Quantum gravity
- Cosmology
- Theoretical physics
Background:
- The causal dynamical triangulations (CDT) model provides a framework for studying quantum gravity.
- Understanding the early universe requires investigating quantum effects on spacetime geometry and topology.
Purpose of the Study:
- To investigate the influence of matter fields on the geometry and topology of quantum universes within the CDT model.
- To explore the role of scalar fields as a new parameter in quantum gravity simulations.
Main Methods:
- Utilizing Monte Carlo computer simulations to model quantum universes.
- Implementing multicomponent scalar fields with toroidal compactification (parameterized by δ) within the CDT framework.
Main Results:
- Observed a phase transition in the quantum universe triggered by the scalar field parameter δ.
- Demonstrated that changing δ can induce a transition from a non-simply connected topology to a simply connected one.
Conclusions:
- Scalar fields can significantly impact the topological structure of quantum universes.
- The discovered phase transition has potential implications for understanding the evolution of early universe topologies.
More Related Videos
11:11Longitudinal Measurement of Extracellular Matrix Rigidity in 3D Tumor Models Using Particle-tracking Microrheology
Published on: June 10, 2014
11.7K
08:13Spatiotemporal Subcellular Manipulation of the Microtubule Cytoskeleton in the Living Preimplantation Mouse Embryo using Photostatins
Published on: November 30, 2021
2.6K
Related Concept Videos
01:17Space-Time Curvature and the General Theory of Relativity
3.3K
In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
3.3K
01:12Transformation of Plane Strain
276
When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
276
01:18Transformation of Plane Stress
421
Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
421
01:15Torque Free Motion
589
The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
589
01:10Entropy Change in Reversible Processes
2.8K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
2.8K
01:21Relation Between Moment of a Force and Angular Momentum
834
In the realm of spinning tops, the application of force at a distance from the center produces torque, a pivotal factor that alters the angular momentum of the top, thereby inducing its rotation. The concept of moment, akin to linear force in rotation, quantifies how a force acting upon an object initiates rotational motion. Angular momentum serves as the rotational counterpart to linear momentum, representing an object's inherent tendency to persist in its rotational state.
The temporal...
The temporal...
834