Sizes in the Universe - Indico
... Amazingly, we have no comprehensive theoretical models telling us how to do this right: - what happens to space and time? Do they become discrete? - how should the complete spectrum of physical states be described? - how does the spectrum of black holes relate to the spectrum of the elementary field ...
... Amazingly, we have no comprehensive theoretical models telling us how to do this right: - what happens to space and time? Do they become discrete? - how should the complete spectrum of physical states be described? - how does the spectrum of black holes relate to the spectrum of the elementary field ...
Introduction to Quantum Systems
... 2. Apply knowledge acquired in explaining commonplace phenomena 3. Communicate acquired concepts to a non-expert public ...
... 2. Apply knowledge acquired in explaining commonplace phenomena 3. Communicate acquired concepts to a non-expert public ...
History of Particle Physics (lecture notes)
... Since then the Standard Model has gone from triumph to triumph. The Cabibbo-‐Kobayashi-‐Maskawa theory of CP violation anticipated the existence of a third family -‐ an anticipation eventually fulfilled ...
... Since then the Standard Model has gone from triumph to triumph. The Cabibbo-‐Kobayashi-‐Maskawa theory of CP violation anticipated the existence of a third family -‐ an anticipation eventually fulfilled ...
Quantum Clock of Radioactive Decay
... a particle needs to traverse a barrier has remained controversial until now. In an attempt to address this issue, physicists gave rise to several concepts such as the phase, dwell, traversal and Larmor time. Peres and some others revived the concept of a quantum clock proposed by Salecker and Wigner ...
... a particle needs to traverse a barrier has remained controversial until now. In an attempt to address this issue, physicists gave rise to several concepts such as the phase, dwell, traversal and Larmor time. Peres and some others revived the concept of a quantum clock proposed by Salecker and Wigner ...
The Learnability of Quantum States
... Quantum Computing and the Interpretation of Quantum Mechanics? David Deutsch’s argument for Many Worlds: “To those who still cling to a single-universe worldview, I issue this challenge: explain how Shor's algorithm works … When Shor's algorithm has factorized a number, using 10⁵⁰⁰ or so times the ...
... Quantum Computing and the Interpretation of Quantum Mechanics? David Deutsch’s argument for Many Worlds: “To those who still cling to a single-universe worldview, I issue this challenge: explain how Shor's algorithm works … When Shor's algorithm has factorized a number, using 10⁵⁰⁰ or so times the ...
Byond Particle Physics
... The history of supersymmetry is exceptional. In the past, virtually all major conceptual breakthroughs have occurred because physicists were trying to understand some established aspect of nature. In contrast, the discovery of supersymmetry in the early 1970s was a purely intellectual achievement, d ...
... The history of supersymmetry is exceptional. In the past, virtually all major conceptual breakthroughs have occurred because physicists were trying to understand some established aspect of nature. In contrast, the discovery of supersymmetry in the early 1970s was a purely intellectual achievement, d ...
幻灯片 1 - 中国科学院理论物理研究所
... The most used approach to cosmology in string theory is to use adiabatic approximation. In such an approach, one uses a collection of fields {F(t)} to describe the background at any given time t, F(t) can be a scalar field, or the geometry parameter. By adiabaticity, we mean that the physics of {F( ...
... The most used approach to cosmology in string theory is to use adiabatic approximation. In such an approach, one uses a collection of fields {F(t)} to describe the background at any given time t, F(t) can be a scalar field, or the geometry parameter. By adiabaticity, we mean that the physics of {F( ...
Epistemological Foun.. - University of Manitoba
... It was hard to see why, after one once knew precisely the position and velocity of a particle, its future could not be determined exactly due to the disturbance of an object by the act of observing it. […] Thinking in this vein, he had the key insight into the origins of the indeterminacy at the ato ...
... It was hard to see why, after one once knew precisely the position and velocity of a particle, its future could not be determined exactly due to the disturbance of an object by the act of observing it. […] Thinking in this vein, he had the key insight into the origins of the indeterminacy at the ato ...
Erwin Schrodinger an Max Born and wavelength
... Erwin Schrodinger and wavelength mechanics • In 1926 he determined that a particle or an atom would vibrate in circles with activity • The atom contained, “Waves of Chance” • When an electron passed through the nucleus these waves would ripple back and forth • They would ripple in a straight line w ...
... Erwin Schrodinger and wavelength mechanics • In 1926 he determined that a particle or an atom would vibrate in circles with activity • The atom contained, “Waves of Chance” • When an electron passed through the nucleus these waves would ripple back and forth • They would ripple in a straight line w ...
Quantum gravity
Quantum gravity (QG) is a field of theoretical physics that seeks to describe the force of gravity according to the principles of quantum mechanics.The current understanding of gravity is based on Albert Einstein's general theory of relativity, which is formulated within the framework of classical physics. On the other hand, the nongravitational forces are described within the framework of quantum mechanics, a radically different formalism for describing physical phenomena based on probability. The necessity of a quantum mechanical description of gravity follows from the fact that one cannot consistently couple a classical system to a quantum one.Although a quantum theory of gravity is needed in order to reconcile general relativity with the principles of quantum mechanics, difficulties arise when one attempts to apply the usual prescriptions of quantum field theory to the force of gravity. From a technical point of view, the problem is that the theory one gets in this way is not renormalizable and therefore cannot be used to make meaningful physical predictions. As a result, theorists have taken up more radical approaches to the problem of quantum gravity, the most popular approaches being string theory and loop quantum gravity. A recent development is the theory of causal fermion systems which gives quantum mechanics, general relativity, and quantum field theory as limiting cases.Strictly speaking, the aim of quantum gravity is only to describe the quantum behavior of the gravitational field and should not be confused with the objective of unifying all fundamental interactions into a single mathematical framework. While any substantial improvement into the present understanding of gravity would aid further work towards unification, study of quantum gravity is a field in it's own right with various branches having different approaches to unification. Although some quantum gravity theories, such as string theory, try to unify gravity with the other fundamental forces, others, such as loop quantum gravity, make no such attempt; instead, they make an effort to quantize the gravitational field while it is kept separate from the other forces. A theory of quantum gravity that is also a grand unification of all known interactions is sometimes referred to as a theory of everything (TOE).One of the difficulties of quantum gravity is that quantum gravitational effects are only expected to become apparent near the Planck scale, a scale far smaller in distance (equivalently, far larger in energy) than what is currently accessible at high energy particle accelerators. As a result, quantum gravity is a mainly theoretical enterprise, although there are speculations about how quantum gravity effects might be observed in existing experiments.