"Quantum cosmology is the attempt in theoretical physics to develop a quantum theory of the universe."
This is a subfield that seeks to formulate a quantum theory of cosmology that could explain the origin and evolution of the universe at the smallest scales of space and time.
Quantum mechanics: The theory of the behavior of matter and energy at the atomic and subatomic level.
General relativity: The theory of gravity developed by Albert Einstein.
The Big Bang: The prevailing cosmological model for the observable universe from the earliest known periods through its subsequent large-scale evolution.
Inflationary cosmology: A theory that proposes a period of extremely rapid expansion of the universe within the first few moments after the Big Bang.
Black holes: Objects with gravitational fields so strong that nothing, not even light, can escape them.
Dark matter: Theoretical matter that is thought to constitute over 85% of the matter in the universe but cannot be directly observed.
Dark energy: A hypothetical form of energy that permeates all of space and is thought to be responsible for the accelerating expansion of the universe.
Quantum field theory: A theoretical framework that combines quantum mechanics and special relativity.
Superstring theory: A theoretical framework that suggests the fundamental constituents of the universe are not particles but one-dimensional "strings" of energy.
Loop quantum gravity: A proposed theory of quantum gravity that attempts to reconcile general relativity and quantum mechanics by quantizing space-time itself.
Loop Quantum Cosmology: This approach uses the principles of loop quantum gravity to describe the evolution of the universe from its quantum origin to the present day.
Euclidean Quantum Gravity: This approach tries to give non-perturbative direction to Quantum Gravity through Wick rotation of space-time.
String Cosmology: String cosmology is based on the idea that the fundamental building blocks of the universe are not point-like particles but rather one-dimensional strings.
Causal Set Cosmology: This approach is based on the idea that spacetime has a fundamentally discrete structure, with events taking place on a set of discrete points.
Many-Worlds Quantum Cosmology: This interpretation of quantum cosmology is based on the idea that the universe is constantly branching into a superposition of many different possible worlds.
Stochastic Gravity: This approach uses random fluctuations in the universe to explain its evolution, rather than the determinism of classical physics.
Supergravity Cosmology: Supergravity is a theory that unifies gravity with supersymmetry, and this approach applies this theory to the study of the early universe.
"Classical cosmology is based on Albert Einstein's general theory of relativity (GTR or simply GR)."
"...describes the evolution of the universe very well, as long as you do not approach the Big Bang."
"It is the gravitational singularity and the Planck time where relativity theory fails to provide what must be demanded of a final theory of space and time."
"A theory is needed that integrates relativity theory and quantum theory."
"...loop quantum cosmology, loop quantum gravity, string theory, and causal set theory."
"In quantum cosmology, the universe is treated as a wave function instead of classical spacetime."
"This approach attempts to answer open questions of classical physical cosmology, particularly those related to the first phases of the universe."
"To develop a quantum theory of the universe."
"Albert Einstein's general theory of relativity (GTR or simply GR)."
"It is the gravitational singularity and the Planck time where relativity theory fails to provide what must be demanded of a final theory of space and time."
"Loop quantum cosmology, loop quantum gravity, string theory, and causal set theory."
"The universe is treated as a wave function instead of classical spacetime."
"Open questions of classical physical cosmology, particularly those related to the first phases of the universe."
"To develop a quantum theory of the universe."
"Albert Einstein's general theory of relativity (GTR or simply GR)."
"It is the gravitational singularity and the Planck time where relativity theory fails to provide what must be demanded of a final theory of space and time."
"A theory that integrates relativity theory and quantum theory is needed."
"Loop quantum cosmology, loop quantum gravity, string theory, and causal set theory."
"The universe is treated as a wave function instead of classical spacetime."