Quantum Mechanics: Bohr Versus Einstein and Relativity Theory
by Owen Borville
July 20, 2024
Physics
The debates between physicists Albert Einstein and Niels Bohr on quantum mechanics are among the most famous in the history of science. These debates primarily took place during the Solvay Conferences in the 1920s and 1930s and revolved around the interpretation of quantum mechanics.
Einstein believed in determinism and in a deterministic universe, where the state of a system could be predicted with certainty if all initial conditions were known.
He famously said, “God does not play dice with the universe.” He also believed in realism and argued that physical reality exists independently of observation. For Einstein, quantum mechanics was incomplete because it could not describe this reality fully.
Einstein believed that a more fundamental theory could explain how individual atoms behave.
Bohr believed and introduced the principle of complementarity, which states that objects can have dual properties (like wave and particle) that are mutually exclusive, yet both are necessary for a full description of quantum phenomena.
Copenhagen Interpretation: Bohr’s interpretation suggested that quantum mechanics does not describe an objective reality but rather probabilities of different outcomes. According to this view, a system exists in all possible states until it is observed.
According to the Copenhagen Interpretation of Quantum Theory subatomic particles such as electrons generally do not have a physical presence but instead exist only as probability distributions over sets of allowable states.
The Copenhagen interpretation of Quantum Physics was developed by Niels Bohr and his assistant, Werner Heisenberg, between 1925 and 1927 and it is based on the proposition that Physics is the science of measurement and that a measurable quantity has no reality until it is measured.
Despite their disagreements, Einstein and Bohr had a deep respect for each other and their debates significantly shaped the development of quantum mechanics.
Bohr’s views eventually became the more widely accepted interpretation, but Einstein’s critiques have continued to inspire further research and alternative interpretations.
The Difference Between Quantum Theory vs Relativity Theory in Describing Nature
Albert Einstein's theories of relativity differ from quantum theory in that while relativity theory is "smooth and continuous" cause and effect with determined outcomes, while quantum theory is full of "quantum leaps or jumps" among subatomic particles that are probabilistic with no definite outcome.
Therefore combining the two theories is difficult. One occurs at the subatomic level, while the other occurs at the gigantic, cosmic level of the universe. Quantum theory allows things that relativity theory does not, and the calculations simply do not work the same at both levels.
Quantum theory and relativity have been difficult to reconcile because of their different views of space and time. Quantum theory sees space and time as a static backdrop for moving particles, while Einstein's theories say that space and time are linked and shaped by the objects within them. Some theories, such as string theory and loop quantum gravity, have proposed modifying Einstein's theory of gravity to make it compatible with quantum theory.
nature.com
sjsu.edu
southampton.ac.uk
theguardian.com/news/2015/nov/04/relativity-quantum-mechanics-universe-physicists#
by Owen Borville
July 20, 2024
Physics
The debates between physicists Albert Einstein and Niels Bohr on quantum mechanics are among the most famous in the history of science. These debates primarily took place during the Solvay Conferences in the 1920s and 1930s and revolved around the interpretation of quantum mechanics.
Einstein believed in determinism and in a deterministic universe, where the state of a system could be predicted with certainty if all initial conditions were known.
He famously said, “God does not play dice with the universe.” He also believed in realism and argued that physical reality exists independently of observation. For Einstein, quantum mechanics was incomplete because it could not describe this reality fully.
Einstein believed that a more fundamental theory could explain how individual atoms behave.
Bohr believed and introduced the principle of complementarity, which states that objects can have dual properties (like wave and particle) that are mutually exclusive, yet both are necessary for a full description of quantum phenomena.
Copenhagen Interpretation: Bohr’s interpretation suggested that quantum mechanics does not describe an objective reality but rather probabilities of different outcomes. According to this view, a system exists in all possible states until it is observed.
According to the Copenhagen Interpretation of Quantum Theory subatomic particles such as electrons generally do not have a physical presence but instead exist only as probability distributions over sets of allowable states.
The Copenhagen interpretation of Quantum Physics was developed by Niels Bohr and his assistant, Werner Heisenberg, between 1925 and 1927 and it is based on the proposition that Physics is the science of measurement and that a measurable quantity has no reality until it is measured.
Despite their disagreements, Einstein and Bohr had a deep respect for each other and their debates significantly shaped the development of quantum mechanics.
Bohr’s views eventually became the more widely accepted interpretation, but Einstein’s critiques have continued to inspire further research and alternative interpretations.
The Difference Between Quantum Theory vs Relativity Theory in Describing Nature
Albert Einstein's theories of relativity differ from quantum theory in that while relativity theory is "smooth and continuous" cause and effect with determined outcomes, while quantum theory is full of "quantum leaps or jumps" among subatomic particles that are probabilistic with no definite outcome.
Therefore combining the two theories is difficult. One occurs at the subatomic level, while the other occurs at the gigantic, cosmic level of the universe. Quantum theory allows things that relativity theory does not, and the calculations simply do not work the same at both levels.
Quantum theory and relativity have been difficult to reconcile because of their different views of space and time. Quantum theory sees space and time as a static backdrop for moving particles, while Einstein's theories say that space and time are linked and shaped by the objects within them. Some theories, such as string theory and loop quantum gravity, have proposed modifying Einstein's theory of gravity to make it compatible with quantum theory.
nature.com
sjsu.edu
southampton.ac.uk
theguardian.com/news/2015/nov/04/relativity-quantum-mechanics-universe-physicists#