Results 201 to 210 of about 174,677 (231)
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1984
In the framework of the standard hot big bang cosmological model, the present density, temperature (TO ≈ 3°K) and Hubble constant (HO ≈ 10-10 years-1) are extrapolated back in time according to the Friedmann expansion law a(t) ~ t1/2 (or a(t) ~ t2/3).
V. G. Lapchinsky +3 more
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In the framework of the standard hot big bang cosmological model, the present density, temperature (TO ≈ 3°K) and Hubble constant (HO ≈ 10-10 years-1) are extrapolated back in time according to the Friedmann expansion law a(t) ~ t1/2 (or a(t) ~ t2/3).
V. G. Lapchinsky +3 more
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Annals of Physics, 1976
Abstract We prove that a Symanzik-Nelson positive quantum field theory, i.e., a quantum field theory derived from a Euclidean field theory, has a unique decomposition into pure phases which preserves Symanzik-Nelson positivity and Poincare covariance. We derive useful sufficient conditions for the breakdown of an internal symmetry of such a theory in
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Abstract We prove that a Symanzik-Nelson positive quantum field theory, i.e., a quantum field theory derived from a Euclidean field theory, has a unique decomposition into pure phases which preserves Symanzik-Nelson positivity and Poincare covariance. We derive useful sufficient conditions for the breakdown of an internal symmetry of such a theory in
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Symmetry breaking due to quantum fluctuations in the massless λϕ4theory
Journal of Physics G: Nuclear Physics, 1982It is shown that quantum fluctuations can act as the driving mechanism of instability leading to spontaneous symmetry breaking in the massless lambda phi 4 theory.
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Possible role of symmetry breaking in quantum measurement theory
Physical Review A, 1986, Zimányi, , Vladár
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Symmetry Breaking as Boundary Constraint Selection in Quantum Field Theory
This provocative theoretical physics paper challenges one of the most mysterious aspects of modern quantum field theory: why does nature seem to "spontaneously" select one vacuum state from countless identical possibilities when fundamental symmetries break?openaire +1 more source
Continuous symmetry breaking in a two-dimensional Rydberg array
Nature, 2023Cheng Chen, Marcus Bintz, Vincent S Liu
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Additions to v22: ·Section 7.8 Quantum Chemistry ·Section 7.8.1 The Exact Solution of the Many-Body Schr"odinger Equation ·Section 7.8.2 Strong Electron Correlation: When Single-Reference Methods Fail ·Section 7.8.3 The Basis Set Incompleteness and Convergence Nightmare ·Section 7.9 Unsolved Problems in Physics Resolved by FCMT ·Section 7.9.1 ...
Zachary Hosack, Grok, xAI
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Zachary Hosack, Grok, xAI
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Continuous symmetry breaking in a trapped-ion spin chain
Nature, 2023Lei Feng, Or Katz, Alexey Gorshkov
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Colloidal Synthesis of Metal Nanocrystals: From Asymmetrical Growth to Symmetry Breaking
Chemical Reviews, 2023Quynh N Nguyen +2 more
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Engineering symmetry breaking in 2D layered materials
Nature Reviews Physics, 2021Luojun Du +2 more
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