Results 11 to 20 of about 1,876 (240)

Basics of modern modeling and expansion of the relativity theory of time in the field of classical physics

Applied Water Science
Throughout history, many scientists considered time as the result of changing the world and believed that time is not true. Among those who say that time is not true, Einstein is the only one who was able to mathematically explain the relativity of time ...
Shayan Shamohammadi
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Kerr-Schild double field theory and classical double copy

Journal of High Energy Physics, 2018
The Kerr-Schild (KS) formalism is a powerful tool for constructing exact solutions in general relativity. In this paper, we present a generalization of the conventional KS formalism to double field theory (DFT) and supergravities.
Kanghoon Lee
doaj   +3 more sources

Quantum signatures in nonlinear gravitational waves [PDF]

Quantum, 2022
The effective quantum field theory description of gravity, despite its non-renormalizability, allows for predictions beyond classical general relativity.
Thiago Guerreiro, Francesco Coradeschi, Antonia Micol Frassino, Jennifer Rittenhouse West, Enrico Junior Schioppa   +4 more
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A Postquantum Theory of Classical Gravity?

Physical Review X, 2023
The effort to discover a quantum theory of gravity is motivated by the need to reconcile the incompatibility between quantum theory and general relativity.
Jonathan Oppenheim
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Spin supplementary condition in quantum field theory: covariant SSC and physical state projection

Journal of High Energy Physics, 2023
The spin supplementary conditions are constraints on spin degrees of freedom in classical relativity which restricts physical degrees of freedom to rotations.
Jung-Wook Kim, Jan Steinhoff
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Gravity, Quantum Fields and Quantum Information: Problems with Classical Channel and Stochastic Theories

Entropy, 2022
In recent years an increasing number of papers have attempted to mimic or supplant quantum field theory in discussions of issues related to gravity by the tools and through the perspective of quantum information theory, often in the context of ...
Charis Anastopoulos, Bei-Lok Hu
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AUGMENTED VARIATIONAL PRINCIPLES AND RELATIVE CONSERVATION LAWS IN CLASSICAL FIELD THEORY [PDF]

International Journal of Geometric Methods in Modern Physics, 2005
Augmented variational principles are introduced in order to provide a definition of relative conservation laws. As it is physically reasonable, relative conservation laws define in turn relative conserved quantities that measure, for example, how much energy is needed in a field theory to go from one configuration (called the reference or vacuum) to ...
Fatibene, L., Ferraris, M., Francaviglia, M.   +2 more
openaire   +3 more sources

Any consistent coupling between classical gravity and quantum matter is fundamentally irreversible [PDF]

Quantum, 2023
When gravity is sourced by a quantum system, there is tension between its role as the mediator of a fundamental interaction, which is expected to acquire nonclassical features, and its role in determining the properties of spacetime, which is inherently ...
Thomas D. Galley, Flaminia Giacomini, John H. Selby   +2 more
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Covariant canonical formulations of classical field theories

SciPost Physics Lecture Notes, 2023
We review in simple terms the covariant approaches to the canonical formulation of classical relativistic field theories (in particular gauge field theories and general relativity) and we discuss the relationships between these approaches as well as the ...
Francois Gieres
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The Magical “Born Rule” and Quantum “Measurement”: Implications for Physics

Foundations, 2023
I. The arena of quantum mechanics and quantum field theory is the abstract, unobserved and unobservable, M-dimensional formal Hilbert space ≠ spacetime. II.
Johan Hansson
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