Constraining scalar-tensor theories using neutron star mass and radius measurements

Tuna, Semih; Ünlütürk, Kıvanç İ.; Ramazanoğlu, Fethi M.

doi:10.1103/physrevd.105.124070

Cited by 15 publications

(3 citation statements)

References 38 publications

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“…The scalar-tensor theory is, of course, different from the CS gravity. However, from the similarity of the equation of motions between the scalar field in [50] and in [51], we expect that the statement of the worse constraint might be true also in the case of the CS gravity.…”

Section: Discussionmentioning

confidence: 94%

“…However, the applicability is nontrivial because the constraint is obtained under the small coupling approximation [50], which is obviously invalid for the coupling range we searched, 10 km 10 8 km. Also, there is another study for scalar-tensor theories [51], which states that a constraint for a massive scalar field is much worse than that for a massless one. This is because the effects of spontaneous scalarization and finite mass are compensated each other in the equation of motion of a scalar field.…”

Section: Discussionmentioning

confidence: 99%

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Observational constraint on axion dark matter with gravitational waves

Tsutsui¹,

Nishizawa²

2022

Preprint

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Most matter in the Universe is invisible and unknown, which is called dark matter. A candidate of dark matter is axion, which is an ultra-light particle motivated as a solution for the CP problem. Axions form clouds in a galactic halo, amplify, and delay a part of gravitational waves propagating in the clouds. The Milky Way is surrounded by the dark matter halo composed of a number of axion patches. Thus, the characteristic secondary gravitational waves are always expected right after the reported gravitational-wave signals from compact binary mergers. In this paper, we derive a realistic amplitude of the secondary gravitational waves. Then we search the gravitational waves having the characteristic time delay and duration with a method optimized for them. We find no significant signal. Assuming the axions are dominant component of dark matter, we obtain the constraints on the axion coupling to the parity violating sector of gravity for the mass range, [1.7 × 10 −13 , 8.5 × 10 −12 ] eV, which is at most ∼ 10 times stronger than that from Gravity Probe B.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Observational constraint on axion dark matter with gravitational waves

Tsutsui¹,

Nishizawa²

2022

Preprint

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“…Spontaneous scalarization alters the magnetic deformation of NSs and the emission of quadrupolar gravitational waves [34]. NS mass and radius measurements can constrain the spontaneous scalarization parameters in scalar tensor theories [35].…”

Section: Introductionmentioning

confidence: 99%

Spontaneous scalarization in proto-neutron stars

Rahimi

Rezaei

2023

Eur. Phys. J. C

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Proto-neutron stars are born when a highly evolved and massive star collapses under gravity. In this paper, we investigate the spontaneous scalarization in proto-neutron stars. Based on the scalar tensor theory of gravity as well as the physical conditions in proto-neutron star, we examine the structure of proto-neutron star. To describe the fluid in proto-neutron star, we utilize SU(2) chiral sigma model and the finite temperature extension of the Brueckner–Bethe–Goldstone quantum many-body theory in the Brueckner–Hartree–Fock approximation. Here, we apply the equation of state of proto-neutron stars considering different cases i.e. hot pure neutron matter and hot $$\beta $$ β -stable neutron star matter without neutrino trapping as well as with neutrino trapping. The effects of temperature and entropy of proto-neutron stars on the star structure are also studied. Our results confirm that the spontaneous scalarization is affected by different physical conditions in proto-neutron stars.

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Neutron Stars as Extreme Gravity Probes

Silva

2024

Recent Progress on Gravity Tests

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Constraining scalar-tensor theories using neutron star mass and radius measurements

Cited by 15 publications

References 38 publications

Observational constraint on axion dark matter with gravitational waves

Observational constraint on axion dark matter with gravitational waves

Spontaneous scalarization in proto-neutron stars

Neutron Stars as Extreme Gravity Probes

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