Current and future white dwarf mass-radius constraints on varying fundamental couplings and unification scenarios

Duarte, Magano,; Boas, J. M. A. Vilas; Martins, C. J. A. P.

doi:10.1103/physrevd.96.083012

Cited by 18 publications

(15 citation statements)

References 30 publications

(51 reference statements)

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“…The effects of varying fundamental couplings on the white dwarf mass-radius relation were recently studied in [129], both for the simple case of a polytropic stellar structure model and for a more general model. This analysis shows that independent measurements of the mass and radius, together with direct spectroscopic measurements of α in white dwarf atmospheres such as those discussed in the previous paragraph, lead to constraints on unification scenarios which interestingly are almost orthogonal to the ones coming from atomic clocks.…”

Section: Other Probesmentioning

confidence: 99%

The status of varying constants: a review of the physics, searches and implications

2017

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Abstract. The observational evidence for the recent acceleration of the universe demonstrates that canonical theories of cosmology and particle physics are incomplete-if not incorrect-and that new physics is out there, waiting to be discovered. A key task for the next generation of laboratory and astrophysical facilities is to search for, identify and ultimately characterize this new physics. Here we highlight recent developments in tests of the stability of nature's fundamental couplings, which provide a direct handle on new physics: a detection of variations will be revolutionary, but even improved null results provide competitive constraints on a range of cosmological and particle physics paradigms. A joint analysis of all currently available data shows a preference for variations of α and µ at about the two-sigma level, but inconsistencies between different sub-sets (likely due to hidden systematics) suggest that these statistical preferences need to be taken with caution. On the other hand, these measurements strongly constrain Weak Equivalence Principle violations. Plans and forecasts for forthcoming studies with facilities such as ALMA, ESPRESSO and the ELT, which should clarify these issues, are also discussed, and synergies with other probes are briefly highlighted. The goal is to show how a new generation of precision consistency tests of the standard paradigm will soon become possible.PACS numbers: 98.80.Es, 95.36.+x, 98.62.Ra,

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Section: Other Probesmentioning

confidence: 99%

The status of varying constants: a review of the physics, searches and implications

2017

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“…In this way, the constraint accuracy of the WD radius is mainly influenced by the precision of the WD mass and the BH's spin. Despite this, while observing a WD tidal disruption with LISA, the mass-radius ratio of a WD can still be constrained with an accuracy on the ∼0.1% level, which will be much better than the current results from astrophysical observations (Holberg et al 2012;Magano et al 2017;Tremblay et al 2017;around 10% level). A few of these types of events will totally decide the composition and EoS of WDs.…”

Section: Wd's Eos Constraint Resultsmentioning

confidence: 88%

“…Once the mass and radius of a WD are determined, then EoS or the composition of WD will be constrained rigidly too. We point out that, with such WD disruption events, LISA will constrain the mass-radius relation of WDs much better than current astronomical methods (Holberg et al 2012;Magano et al 2017;Tremblay et al 2017). …”

Section: Introductionmentioning

confidence: 99%

Determining the Nature of White Dwarfs from Low-frequency Gravitational Waves

Han

Fan

2018

ApJ

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An extreme-mass-ratio system composed of a white dwarf (WD) and a massive black hole can be observed by lowfrequency gravitational wave detectors, such as the Laser Interferometer Space Antenna (LISA). When the mass of the black hole is around 10 4 ∼10 5 M e , the WD will be disrupted by the tidal interaction at the final inspiraling stage. The event position and time of the tidal disruption of the WD can be accurately determined by the gravitational wave signals. Such position and time depend upon the mass of the black hole and especially on the density of the WD. We present the theory that by using LISA-like gravitational wave detectors, the mass-radius relation and the equations of state of WDs could be strictly constrained (accuracy up to 0.1%). We also point out that LISA can accurately predict the disruption time of a WD and forecast the electromagnetic follow-up of this tidal disruption event.

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“…On the other hand, Magano et al (2017) obtained bounds on the possible variation of the fundamental constants from the mass-radius relation in white dwarfs. Unlike the analyses performed for other bounds described in this paper †, it is necessary to assume a theoretical model for the relation between the variation of the electron and nucleon masses and α.…”

Section: Bounds On α and μmentioning

confidence: 99%

“…Next, a statistical analysis was performed to estimate bounds on α from observational data. For each star i in the catalog, Magano et al (2017) chose a value of M to minimize the following quantity:…”

Section: Bounds On α and μmentioning

confidence: 99%

Variation of fundamental constants and white dwarfs

Landau

2019

Proc. IAU

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Theories that attempt to unify the four fundamental interactions and alternative theories of gravity predict time and/or spatial variation of the fundamental constants of nature. Different versions of these theories predict different behaviours for these variations. As a consequence, experimental and observational bounds are an important tool to check the validity of such proposals. In this paper, we review constraints on the possible variation of the fundamental constants from astronomical observations and geophysical experiments designed to test the constancy of the fundamental constants of nature over different timescales. We also focus on the limits that can be obtained from white dwarfs, which can constrain the variation of the constants with the gravitational potential.

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Current and future white dwarf mass-radius constraints on varying fundamental couplings and unification scenarios

Cited by 18 publications

References 30 publications

The status of varying constants: a review of the physics, searches and implications

The status of varying constants: a review of the physics, searches and implications

Determining the Nature of White Dwarfs from Low-frequency Gravitational Waves

Variation of fundamental constants and white dwarfs

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