Solar-stellar astrophysics and dark matter

Turck‐Chièze, S.; Lopes, Ilídio

doi:10.1088/1674-4527/12/8/011

Cited by 48 publications

(41 citation statements)

References 123 publications

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“…From an analysis of colliding galaxy clusters, Harvey et al [4] recently set robust limits which constrain the self-interaction cross section to σ χχ /m χ < ∼ 8.3 × 10 −25 cm 2 /GeV. Meanwhile, helioseismology has been used as a complementary tool to constrain the properties of DM [5]. This is possible because DM particles accumulating in a star transport energy by conduction, affecting its stellar structure, in particular in the stellar core.…”

Section: Introductionmentioning

confidence: 99%

Asteroseismic constraints on asymmetric dark matter: Light particles with an effective spin-dependent coupling

2017

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So far, direct detection searches have come empty handed in their quest for Dark Matter (DM). Meanwhile, asteroseismology arises as a complementary tool to study DM, as its accumulation in a star can enhance energy transport, by providing a conduction mechanism, producing significant changes in the stellar structure during the course of the star's evolution. The stellar core, particularly affected by the presence of DM, can be investigated through precise asteroseismic diagnostics. We modelled three stars including DM energy transport: the Sun, a slightly less massive and much older star, KIC 7871531 (0.85 M ⊙ , 9.41 Gyr), and a more massive and younger one, KIC 8379927 (1.12 M ⊙ , 1.82 Gyr). We considered both the case of Weakly Interactive Massive Particles, albeit with a low annihilation, and the case of Asymmetric DM for which the number of trapped particles in the star can be much greater. By analysing these models with asteroseismic separation ratios weighted towards the core, we found indications limiting the effective spin-dependent DM-proton coupling for masses of a few GeV. This independent result is very close to the most recent and most stringent direct detection DM constraints.

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Section: Introductionmentioning

confidence: 99%

Asteroseismic constraints on asymmetric dark matter: Light particles with an effective spin-dependent coupling

2017

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“…It has also been known for more than a decade that the extraction of the soundspeed profile in the core must be done carefully. It is the reason why this information was obtained using only low-degree modes with frequencies smaller than 2.4 mHz (Turck-Chièze et al 2001;Turck-Chièze & Lopes 2012).…”

Section: Introductionmentioning

confidence: 99%

Seismic sensitivity to sub-surface solar activity from 18 yr of GOLF/SoHO observations

Salabert

García

Turck‐Chièze

2015

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Solar activity has significantly changed over the last two Schwabe cycles. After a long and deep minimum at the end of Cycle 23, the weaker activity of Cycle 24 contrasts with the previous cycles. In this work, the response of the solar acoustic oscillations to solar activity is used in order to provide insights into the structural and magnetic changes in the sub-surface layers of the Sun during this on-going unusual period of low activity. We analyze 18 yr of continuous observations of the solar acoustic oscillations collected by the Sun-as-a-star GOLF instrument on board the SoHO spacecraft. From the fitted mode frequencies, the temporal variability of the frequency shifts of the radial, dipolar, and quadrupolar modes are studied for different frequency ranges that are sensitive to different layers in the solar sub-surface interior. The low-frequency modes show nearly unchanged frequency shifts between Cycles 23 and 24, with a time evolving signature of the quasi-biennial oscillation, which is particularly visible for the quadrupole component revealing the presence of a complex magnetic structure. The modes at higher frequencies show frequency shifts that are 30% smaller during Cycle 24, which is in agreement with the decrease observed in the surface activity between Cycles 23 and 24. The analysis of 18 yr of GOLF oscillations indicates that the structural and magnetic changes responsible for the frequency shifts remained comparable between Cycle 23 and Cycle 24 in the deeper sub-surface layers below 1400 km as revealed by the low-frequency modes. The frequency shifts of the higher-frequency modes, sensitive to shallower regions, show that Cycle 24 is magnetically weaker in the upper layers of Sun.

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“…Among other applications, to validate the new gravitational theories proposed as an alternative to General Relativity, 10,23,50,62,89 and to probe the existence of dark matter (DM) inside stars to investigate the DM problem. 78,97 Currently, the interest of studying the interaction of DM with stars is twofold: on the one hand to identify which type of particles DM is made of, and, on the other hand, to understand the physical mechanisms by which DM contributes to the formation of stars. In the former, stars are used as a complementary tool to test DM candidates, being in that way an alternative method to test the candidates proposed by modern theories of particle physics, or alternatively, to test candidates detected by experiments of direct or indirect DM searches.…”

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confidence: 99%

The Sun and stars: Giving light to dark matter

Casanellas

Lopes

2014

Mod. Phys. Lett. A

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During the last century, with the development of modern physics in such diverse fields as thermodynamics, statistical physics, and nuclear and particle physics, the basic principles of the evolution of stars have been successfully well understood. Nowadays, a precise diagnostic of the stellar interiors is possible with the new fields of helioseismology and astroseismology. Even the measurement of solar neutrino fluxes, once a problem in particle physics, is now a powerful probe of the core of the Sun. These tools have allowed the use of stars to test new physics, in particular the properties of the hypothetical particles that constitute the dark matter of the Universe. Here we present recent results obtained using this approach

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Solar-stellar astrophysics and dark matter

Cited by 48 publications

References 123 publications

Asteroseismic constraints on asymmetric dark matter: Light particles with an effective spin-dependent coupling

Asteroseismic constraints on asymmetric dark matter: Light particles with an effective spin-dependent coupling

Seismic sensitivity to sub-surface solar activity from 18 yr of GOLF/SoHO observations

The Sun and stars: Giving light to dark matter

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