Results 101 to 110 of about 4,373,963 (233)
Effective field theory after a new-physics discovery
Journal of High Energy Physics, 2018 When a new heavy particle is discovered at the LHC or at a future high-energy collider, it will be interesting to study its decays into Standard Model particles using an effective field-theory framework. We point out that the proper effective theory must
Stefan Alte +2 more
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Effective Field Theory of Loop Quantum Cosmology
Universe, 2019 Quantum cosmology is traditionally formulated in a minisuperspace setting, implicitly averaging fields over space to obtain homogeneous models. For universal reasons related to the uncertainty principle, quantum corrections then depend on the size of the
Martin Bojowald
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On Effective Field Theories at Finite Temperature [PDF]
arXiv, 1997 Chapter one is devoted to a study of fermions and bosons in two spatial dimensions in external electromagnetic fields. The effectve action is calculated by integrating out the matter fields. In chapter two, I investigate the resummation program of Braaten and Pisarski.
arxiv
Renormalizability of Effective Scalar Field Theory
, 1993 We present a comprehensive discussion of the consistency of the effective quantum field theory of a single $Z_2$ symmetric scalar field. The theory is constructed from a bare Euclidean action which at a scale much greater than the particle's mass is ...
Oxford Ox Np +2 more
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Effective potential in Lorentz-breaking field theory models
European Physical Journal C: Particles and Fields, 2017 We calculate explicitly the one-loop effective potential in different Lorentz-breaking field theory models. First, we consider a Yukawa-like theory and some examples of Lorentz-violating extensions of scalar QED.
A. P. Baeta Scarpelli +4 more
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Effective field theory of black hole echoes
Journal of High Energy Physics, 2018 Gravitational wave ‘echoes’ during black-hole merging events have been advocated as possible signals of modifications to gravity in the strong-field (but semiclassical) regime.
C. P. Burgess +2 more
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On the power counting in effective field theories
Physics Letters B, 2014 We discuss the systematics of power counting in general effective field theories, focussing on those that are nonrenormalizable at leading order. As an illuminating example we consider chiral perturbation theory gauged under the electromagnetic $U(1)$ symmetry. This theory describes the low-energy interactions of the octet of pseudo-Goldstone bosons in
Gerhard Buchalla +2 more
openaire +4 more sources
SciPost PhysicsIntroducing low-energy effective Hamiltonians is usual to grasp most correlations in quantum many-body problems. For instance, such effective Hamiltonians can be treated at the mean-field level to reproduce some physical properties of interest. Employing
Raphaël Photopoulos, Antoine Boulet
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Unitarity problems for an effective field theory description of early universe cosmology. [PDF]
Eur Phys J C Part Fields, 2022 Brandenberger R, Kamali V.
europepmc +1 more source
A Comment on Heavy Quark Effective Fields [PDF]
Nuovo Cim. A110 (1997) 295-302, 1996 Effective fields defined in the heavy-quark effective theory to describe heavy quarks in heavy-light hadrons are examined in some detail in the standard formulation of a quantum field theory.
arxiv