The existence of a two-solar mass neutron star constrains the gravitational constant G_N at strong field

Abstract

In General Relativity there is a maximum mass allowed for neutron stars that, if exceeded, entails their collapse into a black hole. Its precise value depends on details of the nuclear matter equation of state about which we are much more certain thanks to recent progress in low-energy effective theories. The discovery of a two-solar mass neutron star, near that maximum mass, when analyzed with modern equations of state, implies that Newton's gravitational constant in the star cannot exceed its value on Earth by more than 8% at 95% confidence level. This is a remarkable leap of ten orders of magnitude in the gravitational field intensity at which the constant has been constrained.

5 pages including 8 figures

References in corpus (7)

• Shapiro delay measurement of a two solar mass neutron star
• Tests of general relativity from timing the double pulsar
• Astrophysical Measurement of the Equation of State of Neutron Star Matter
• Constraints on neutron star radii based on chiral effective field theory interactions
• The interior spacetimes of stars in Palatini f(R) gravity
• The chiral quark condensate and pion decay constant in nuclear matter at next-to-leading order
• Model Study of a Quark Star

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• Hadron matter in neutron stars in view of gravitational wave observations
• Unbiased interpolated neutron-star EoS at finite T for modified gravity studies
• Constraining Palatini gravity with GR-independent equations of state for neutron stars
• An in-medium chiral power counting for nuclear matter and some applications
• Monopolar and quadrupolar gravitational radiation from magnetically deformed neutron stars in modified gravity
• Ladder resummation of spin 1/2 fermion many-body systems with arbitrary partial-wave content
• One possible mechanism for massive neutron star supported by soft EOS
• Ridges in rotating neutron-star properties due to first order phase transitions
• Nuclear matter from the ladder resummation in terms of the experimental nucleon-nucleon scattering amplitudes
• Constraining gravity with hadron physics: neutron stars, modified gravity and gravitational waves
• Ultracold spin-balanced fermionic quantum liquids with renormalized $P$-wave interactions
• Unitarization Technics in Hadron Physics with Historical Remarks