Consistency tests of the stability of fundamental couplings and unification scenarios

Ferreira, Michel; Frigola, O.; Martins, C. J. A. P.; Monteiro, A. M. R. V. L.; Solà, Joan

doi:10.1103/physrevd.89.083011

Cited by 25 publications

(21 citation statements)

References 68 publications

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“…Anyway, the idea is exploring different parameters in the Polyakov loop potential to force as much as possible the proximity of both critical temperatures. Also, as shown in [30,49,50] the peak of χ l T occurs at a lower temperature than the one of χ u T , in coincidence with our results presented in Tables 1 − 4.…”

Section: Chiral and Deconfinement Transitionssupporting

confidence: 92%

Finite size effects in strongly interacting matter at zero chemical potential from Polyakov loop Nambu-Jona-Lasinio model in the light of lattice data

Grunfeld

Lugones

2018

Eur. Phys. J. C

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We study finite volume effects within the Polyakov loop Nambu-Jona-Lasinio model for two light and one heavy quarks at vanishing baryon chemical potential and finite temperatures. We include three different Polyakov loop potentials and ensure that the predictions of our effective model in bulk are compatible with lattice QCD results. Finite size effects are taken into account by means of the Multiple Reflection Expansion formalism. We analyze several thermodynamic quantities including the interaction measure, the speed of sound, the surface tension, and the curvature energy and find that they are sensitive to finite volume effects, specially for systems with radii below ∼ 10 fm and temperatures around the crossover one. For all sizes, the system undergoes a smooth crossover. The chiral critical temperature decreases by around 5% and the deconfinement temperature by less than a 2% when the radius goes from infinity to 3 fm. Thus, as the drop's size decreases, both temperatures become closer. The surface tension is dominated by the contribution of strange quarks and the curvature energy by u and d quarks. At large temperatures both quantities grow proportionally to T 3/2 but saturate to a constant value at low T .

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Section: Chiral and Deconfinement Transitionssupporting

confidence: 92%

Finite size effects in strongly interacting matter at zero chemical potential from Polyakov loop Nambu-Jona-Lasinio model in the light of lattice data

Grunfeld

Lugones

2018

Eur. Phys. J. C

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“…We still have ρ ∝ 1=a 4 (since p ¼ 1=3ρ) and ρ ∝ T 4 γ , so T γ ∝ 1=a remains true. Even though this conclusion seems supported by copious past literature, it remains controversial in some quarters [12,14,25] (in part due to a misunderstanding for which [7] may be partly responsible). Clearly there are many possible definitions for the energy in a dielectric, but the one responsible for a conservation law is the most appropriate.…”

Section: Discussionmentioning

confidence: 94%

“…Despite this general pattern, it has been claimed that variations of α and μ are able to create discernible (logarithmic) differences in the temperature-redshift evolution for massless particles in BSBM theories [12][13][14]. This is one aspect of the original formulation of a varying α theory by BSBM that will be the focus of this paper.…”

Section: Introductionmentioning

confidence: 95%

Redshifting of cosmological black bodies in Bekenstein-Sandvik-Barrow-Magueijo varying-alpha theories

2014

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We analyze the behavior of blackbody radiation in theories of electromagnetism which allow the electron charge and the fine structure constant to vary in space and time. We show that such theories can be expressed as relativistic generalizations of a conventional dielectric. By making the appropriate definition of the vector potential and associated gauge transformations, we can identify the equivalent of the electric and displacement fields, E and D, as well as the magnetic B and H fields. We study the impact of such dielectrics on the propagation of light in the so-called "BSBM" theory. We examine the form of simple cosmological solutions and conclude that no changes are created to the standard cosmological evolution of the temperature and energy density of blackbody radiation. Nonetheless the matter evolution changes and the behavior of the entropy per baryon is modified, and the ratios of different dark matter components may be changed too.

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“…This compilation includes the early results of the UVES Large Program for Testing Fundamental Physics [9,10], which is expected to be the one with a better control of possible systematics. The source of the data in this Table is also further discussed in [12].…”

Section: Available Data and Parameterizationsmentioning

confidence: 99%

Updated constraints on spatial variations of the fine-structure constant

Pinho

Martins

2016

Physics Letters B

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Recent work by Webb et al. has provided indications of spatial variations of the fine-structure constant, α, at a level of a few parts per million. Using a dataset of 293 archival measurements, they further show that a dipole provides a statistically good fit to the data, a result subsequently confirmed by other authors. Here we show that a more recent dataset of dedicated measurements further constrains these variations: although there are only 10 such measurements, their uncertainties are considerably smaller. We find that a dipolar variation is still a good fit to the combined dataset, but the amplitude of such a dipole must be somewhat smaller: 8.1 ± 1.7 ppm for the full dataset, versus 9.4 ± 2.2 ppm for the Webb et al. data alone, both at the 68.3% confidence level. Constraints on the direction on the sky of such a dipole are also significantly improved. On the other hand the data can't yet discriminate between a pure spatial dipole and one with an additional redshift dependence.

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Consistency tests of the stability of fundamental couplings and unification scenarios

Cited by 25 publications

References 68 publications

Finite size effects in strongly interacting matter at zero chemical potential from Polyakov loop Nambu-Jona-Lasinio model in the light of lattice data

Finite size effects in strongly interacting matter at zero chemical potential from Polyakov loop Nambu-Jona-Lasinio model in the light of lattice data

Redshifting of cosmological black bodies in Bekenstein-Sandvik-Barrow-Magueijo varying-alpha theories

Updated constraints on spatial variations of the fine-structure constant

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