Nambu monopoles in lattice electroweak theory

Баккер, Б. Л. Г.; Veselov, A.I.; Zubkov, M. A.

doi:10.1088/0954-3899/36/7/075008

Cited by 5 publications

(5 citation statements)

References 60 publications

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“…Such investigations of isolated peptides in the gas phase offer an unbiased view of structure-formation trends intrinsic to the molecule, a strategy that is successful for charged and uncharged amino acids and peptides. [20][21][22][23][24][25][26][27][28][29][30] By the stepwise addition of perturbing contributions, in this case, the presence of cations, we aim to determine the main contributions to protein secondary structure formation in a bottom-up approach. The success of such an approach is critically linked to the quality of the description of the potential-energy surface of the system under investigation.…”

Section: Resultsmentioning

confidence: 99%

How Cations Change Peptide Structure

Baldauf¹,

Pagel²,

Warnke³

et al. 2013

Chemistry A European J

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Specific interactions between cations and proteins have a strong impact on peptide and protein structure. Herein, we shed light on the nature of the underlying interactions, especially regarding effects on the polyamide backbone structure. This was done by comparing the conformational ensembles of model peptides in isolation and in the presence of either Li(+) or Na(+) by using state-of-the-art density-functional theory (including van der Waals effects) and gas-phase infrared spectroscopy. These monovalent cations have a drastic effect on the local backbone conformation of turn-forming peptides, by disruption of the hydrogen-bonding networks, thus resulting in severe distortion of the backbone conformations. In fact, Li(+) and Na(+) can even have different conformational effects on the same peptide. We also assess the predictive power of current approximate density functionals for peptide-cation systems and compare to results with those of established protein force fields as well as high-level quantum chemistry calculations (CCSD(T)).

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Section: Resultsmentioning

confidence: 99%

How Cations Change Peptide Structure

Baldauf¹,

Pagel²,

Warnke³

et al. 2013

Chemistry A European J

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“…However, when energy of the processes approaches 1 Tev we expect these objects influence the dynamics. Recently the indications in favor of this point of view were indeed found [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…In table 1 of [2] the data on the ultraviolet cutoff achieved in selected lattice studies of the SU (2) Gauge Higgs model are presented. Everywhere β is around β ∼ 8 and the renormalized fine structure constant is around α ∼ 1/110.…”

Section: Introductionmentioning

confidence: 99%

How to approach continuum physics in the lattice Weinberg-Salam model

Zubkov

2010

Phys. Rev. D

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We investigate lattice Weinberg -Salam model without fermions numerically for the realistic choice of coupling constants correspondent to the value of the Weinberg angle θW ∼ 30 o , and bare fine structure constant around α ∼ 1 150 . We consider the values of the scalar self coupling corresponding to Higgs mass MH ∼ 100, 150, 270 GeV. It has been found that nonperturbative effects become important while approaching continuum physics within the lattice model. When the ultraviolet cutoff Λ = π a (where a is the lattice spacing) is increased and achieves the value around 1 TeV one encounters the fluctuational region (on the phase diagram of the lattice model), where the fluctuations of the scalar field become strong. The classical Nambu monopole can be considered as an embryo of the unphysical symmetric phase within the physical phase. In the fluctuational region quantum Nambu monopoles are dense and, therefore, the use of the perturbation expansion around trivial vacuum in this region is limited. Further increase of the cutoff is accompanied by a transition to the region of the phase diagram, where the scalar field is not condensed (this happens at the value of Λ around 1.4 TeV for the considered lattice sizes). Within this region further increase of the cutoff is possible although we do not observe this in details due to the strong fluctuations of the gauge boson correlator. Both mentioned above regions look unphysical. Therefore we come to the conclusion that the maximal value of the cutoff admitted within lattice Electroweak theory cannot exceed the value of the order of 1 TeV.

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“…The earliest applications involved the study of electromagnetic probes on mesons, nucleons, and nuclei. Some of the relevant papers are [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. The first three-nucleon bound state calculation using this framework was performed by Glöckle, Coester and Lee [28].…”

Section: Introductionmentioning

confidence: 99%

Mini Review of Poincaré Invariant Quantum Theory

et al. 2010

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We review the construction and applications of exactly Poincaré invariant quantum mechanical models of few-degree of freedom systems. We discuss the construction of dynamical representations of the Poincaré group on few-particle Hilbert spaces, the relation to quantum field theory, the formulation of cluster properties, and practical considerations related to the construction of realistic interactions and the solution of the dynamical equations. Selected applications illustrate the utility of this approach.

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Nambu monopoles in lattice electroweak theory

Cited by 5 publications

References 60 publications

How Cations Change Peptide Structure

How Cations Change Peptide Structure

How to approach continuum physics in the lattice Weinberg-Salam model

Mini Review of Poincaré Invariant Quantum Theory

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