Spontaneous scalarization

Salgado, Marcelo; Sudarsky, Daniel; Nucamendi, Ulises

doi:10.1103/physrevd.58.124003

Cited by 104 publications

(161 citation statements)

References 21 publications

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“…However, for realistic objects, this contribution will be much larger than the gravitational one so we do not expect significant deviations from the case with ordinary equations of state. We point out that this is a very different situation as in previous models, like [16], where the amount of spontaneous scalarization was much larger. In our case, the presence of Higgs potential in the action effectively prevents fundamental interactions to change inside compact objects.…”

Section: Discussionmentioning

confidence: 63%

“…This is a new result due to the combined action of the nonminimal coupling and the field potential. In fact, it is absent if the potential vanishes as in [16].…”

Section: Numerical Resultsmentioning

confidence: 99%

“…In the previous sections, we have shown that the metric components inside the compact object are almost the same as in GR when we choose the standard model values for the parameters of the potential. Therefore, we follow a simplified procedure, which consists in using the GR solution [with the top-hat matter distribution (16)] for the metric components and focus solely on the nontrivial dynamics of the Higgs field. We provide for a proof of this approximation in Appendix B through the comparison between this approach and the numerical integration of the unaltered system of equations of motion.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…We will consider only positive values of ξ to avoid the possibility that the effective reduced Planck mass [that can be identified with ðm 2 p þ ξH 2 Þ 1=2 ] becomes imaginary. A similar Lagrangian for compact objects was already considered in [16], where, however, the potential was neglected. As we will see below, this is an important difference as the presence of the Higgs potential prevents the solution to smoothly converge to GR.…”

Section: The Modelmentioning

confidence: 99%

“…Here, we adopt the splitting of the energy momentum tensor proposed in [16] as each part will give distinct contributions, as we will see in Sec. V. The set of equations of motion is completed by the Klein-Gordon equation…”

Section: The Modelmentioning

confidence: 99%

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Particlelike solutions in modified gravity: The Higgs monopole

et al. 2014

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Higgs inflation has received remarkable attention in the last few years due to its simplicity and predictive power. The key point of this model is the nonminimal coupling to gravity in unitary gauge. As such, this theory is in fact a scalar-tensor modification of gravity that needs to be studied also below the energy scales of inflation. Motivated by this goal, we study in great analytical and numerical detail the static and spherically symmetric solutions of the equations of motion in the presence of standard baryonic matter, called "Higgs monopoles" and presented in Füzfa et al. [Phys. Rev. Lett. 111, 12 (2013)]. These particlelike solutions may arise naturally in tensor-scalar gravity with Mexican hat potential and are the only globally regular asymptotically flat solutions with finite classical energy. In the case when the parameters of the potential are taken to be the ones of the standard model, we find that the deviations from general relativity are extremely small, especially for bodies of astrophysical size and density. This allows us to derive a simplified description of the monopole, for which the metric inside the spherical matter distribution can be approximated by the standard metric of general relativity. We study how the properties of these monopoles depend on the strength of the nonminimal coupling to gravity and on the baryonic mass and compactness. An important and original result is the existence of a mechanism of resonant amplification of the Higgs field inside the monopole that comes into play for large nonminimal coupling. We show that this mechanism might degenerate into divergences of the Higgs field that reveal the existence of forbidden combinations of radius and baryonic energy density.

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Section: Discussionmentioning

confidence: 63%

“…This is a new result due to the combined action of the nonminimal coupling and the field potential. In fact, it is absent if the potential vanishes as in [16].…”

Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%

Section: The Modelmentioning

confidence: 99%

Section: The Modelmentioning

confidence: 99%

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Particlelike solutions in modified gravity: The Higgs monopole

et al. 2014

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Strategies for Enhancing the Yield of the Potent Insecticide Spinosad in Actinomycetes

Tao

Zhang

Deng

et al. 2018

Biotechnology Journal

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Spinosad is a potent insecticide that exhibits an excellent environmental and mammalian profile. However, spinosad production in the original producer, Saccharopolyspora spinosa, is insufficient for the huge global demand. Great efforts have been exerted to improve the production of spinosad. Strategies for spinosad overproduction in actinomycetes are reviewed in this article, including metabolic engineering of the precursor and spinosyn biosynthetic pathway, introduction of regulatory genes, genome-scale metabolic model-guided engineering, mutagenesis, genome shuffling, fermentation process optimization, omics analysis, and the heterologous biosynthesis of spinosad in other actinomycetes. Furthermore, highly productive industrial strains should be used as heterologous hosts for enhancing spinosad biosynthesis in the future. To accelerate the engineering process, the CRISPR/Cas9 system should be established in Sa. spinosa for large-scale genome editing. Notably, the regulatory mechanism of spinosad biosynthesis remains unclear. Thus, the combining multi-omics analysis with high-throughput screening of chemical elicitors would be a promising approach in characterizing the regulatory and signal transduction mechanisms and improving spinosad production in Sa. Spinosa.

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Mathematical Modeling of Boson–Fermion Stars in the Generalized Scalar–Tensor Theories of Gravity

Boyadjiev¹,

Todorov²,

Fiziev³

et al. 2001

Journal of Computational Physics

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A model of static boson-fermion star with spherical symmetry based on the scalar-tensor theory of gravity with massive dilaton field is investigated numerically.Since the radius of star is a priori an unknown quantity, the corresponding boundary value problem (BVP) is treated as a nonlinear spectral problem with a free internal boundary. The Continuous Analogue of Newton Method (CANM) for solving this problem is applied.Information about basic geometric functions and the functions describing the matter fields, which build the star is obtained. In a physical point of view the main result is that the structure and properties of the star in presence of massive dilaton field depend essentially both of its fermionic and bosonic components.Keywords. boson-fermion star, scalar-tensor theory of gravity, massive dilaton field, twoparametric nonlinear spectral problem, continuous analog of Newton method, method of splinecollocation.

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Spontaneous scalarization

Cited by 104 publications

References 21 publications

Particlelike solutions in modified gravity: The Higgs monopole

Particlelike solutions in modified gravity: The Higgs monopole

Strategies for Enhancing the Yield of the Potent Insecticide Spinosad in Actinomycetes

Mathematical Modeling of Boson–Fermion Stars in the Generalized Scalar–Tensor Theories of Gravity

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