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Unitarity
New post in Unitarity
Why does time evolution preserve the norm of a wavefunction?
March 5th, 2020
schroedinger-equation
hilbert-space
unitarity
time-evolution
probability
Griffith's Proof that a wave function will stay normalized is incorrect?
December 17th, 2020
quantum-mechanics
schroedinger-equation
unitarity
normalization
Why is time evolution unitary?
August 1st, 2022
unitarity
time-evolution
quantum-mechanics
What exactly does No cloning mean, in the context of Quantum Computing?
August 1st, 2022
hilbert-space
quantum-information
quantum-mechanics
unitarity
quantum-computer
Why do negative norm states break unitarity?
May 16th, 2020
ghosts
unitarity
quantization
gauge-theory
quantum-field-theory
Why is imaginary time evolution non-unitary?
August 1st, 2022
quantum-mechanics
unitarity
wick-rotation
complex-numbers
time-evolution
On finite-dimensional unitary representations of non-compact Lie groups
August 1st, 2022
unitarity
symmetry
group-theory
representation-theory
Unitarity and renormalizability
August 1st, 2022
quantum-field-theory
renormalization
unitarity
Why are symmetry transformations connected to the identity necessarily represented by linear unitary operators?
August 1st, 2022
quantum-mechanics
operators
hilbert-space
group-representations
unitarity
Basic question about the S-Matrix, Unitarity and Effective Field Theory
December 20th, 2020
s-matrix-theory
renormalization
unitarity
effective-field-theory
quantum-field-theory
Relation between unitarity and conservation of probability
November 8th, 2020
quantum-mechanics
probability
unitarity
Why is $SU(3)$ chosen as the gauge group in QCD?
August 1st, 2022
quantum-chromodynamics
standard-model
group-theory
unitarity
Is the Lagrangian density in field theory real?
July 19th, 2020
unitarity
lagrangian-formalism
quantum-field-theory
action
path-integral
Information encoded on the surface of a black hole
April 5th, 2022
information
holographic-principle
black-holes
event-horizon
unitarity
Why can't two different quantum states evolve into the same final state?
January 8th, 2020
unitarity
time-evolution
quantum-information
hilbert-space
quantum-mechanics
Does Wick rotation work for quantum gravity?
August 10th, 2020
quantum-gravity
unitarity
wick-rotation
Are all representations of a finite group unitary?
January 25th, 2020
mathematics
group-theory
unitarity
representation-theory
Probability conservation in WKB tunneling
August 1st, 2022
quantum-mechanics
s-matrix-theory
unitarity
quantum-tunneling
semiclassical
Irreducible Representations Of Lorentz Group
May 13th, 2020
unitarity
poincare-symmetry
representation-theory
group-representations
quantum-field-theory
How does the Ward-Takahashi Identity imply that non-transverse photons are unphysical in QED?
August 1st, 2022
gauge-theory
unitarity
ward-identity
renormalization
quantum-electrodynamics
Why does the action have to be hermitian?
February 20th, 2020
quantum-field-theory
s-matrix-theory
unitarity
action
Sign in front of QFT kinetic terms
March 8th, 2022
dirac-equation
quantum-field-theory
lagrangian-formalism
fermions
unitarity
Why do quantum gates have to be reversible?
April 6th, 2022
unitarity
quantum-computer
quantum-information
Clarifications needed on Gauge Fixing and Ghosts
October 10th, 2020
ghosts
quantum-field-theory
gauge-theory
unitarity
gauge
How do derivative couplings affect canonical quantization?
August 1st, 2022
unitarity
feynman-diagrams
hamiltonian-formalism
lagrangian-formalism
quantum-field-theory
Lorentz transformations for spinors
July 31st, 2020
quantum-field-theory
lorentz-symmetry
spinors
unitarity
group-theory
Again: why do quantum computations need to be reversible?
August 1st, 2022
quantum-computer
reversibility
unitarity
What is meant by unitary time evolution?
November 3rd, 2020
quantum-mechanics
hilbert-space
hamiltonian
unitarity
time-evolution
QED and anomaly
April 10th, 2021
quantum-anomalies
ward-identity
quantum-field-theory
quantum-electrodynamics
unitarity
Is it possible to derive Schrodinger equation in this way?
November 5th, 2020
time-evolution
schroedinger-equation
unitarity
quantum-mechanics
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