A first-principles energy-function calculation determines the quartic coefficient b0 whose sign sets the order of the spontaneous-scalarization phase transition in scalar-tensor neutron stars.
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Tensor-scalar gravity and binary-pulsar experiments
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abstract
Some recently discovered nonperturbative strong-field effects in tensor-scalar theories of gravitation are interpreted as a scalar analog of ferromagnetism: "spontaneous scalarization". This phenomenon leads to very significant deviations from general relativity in conditions involving strong gravitational fields, notably binary-pulsar experiments. Contrary to solar-system experiments, these deviations do not necessarily vanish when the weak-field scalar coupling tends to zero. We compute the scalar "form factors" measuring these deviations, and notably a parameter entering the pulsar timing observable gamma through scalar-field-induced variations of the inertia moment of the pulsar. An exploratory investigation of the confrontation between tensor-scalar theories and binary-pulsar experiments shows that nonperturbative scalar field effects are already very tightly constrained by published data on three binary-pulsar systems. We contrast the probing power of pulsar experiments with that of solar-system ones by plotting the regions they exclude in a generic two-dimensional plane of tensor-scalar theories.
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representative citing papers
Numerical relativity in the decoupling limit reveals dynamical scalarization and spin-induced (de)scalarization during hyperbolic black hole encounters for both signs of the coupling.
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Heavy scalar fields in neutron stars form interior shell-localized profiles that reshape the effective equation of state and break the I-Q relation while remaining hidden from binary pulsar observations.
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Underlying mechanisms of phase transitions in scalar-tensor theories
A first-principles energy-function calculation determines the quartic coefficient b0 whose sign sets the order of the spontaneous-scalarization phase transition in scalar-tensor neutron stars.
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Scalarization and descalarization in hyperbolic encounters of black holes
Numerical relativity in the decoupling limit reveals dynamical scalarization and spin-induced (de)scalarization during hyperbolic black hole encounters for both signs of the coupling.
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A geometric multimessenger consistency test of radiative and near-zone gravity with LISA and SKA
Defines residual ε between Shapiro-delay and GW-derived inclinations for LISA-SKA pulsars and estimates attainable precision at 4e-3 to 9e-4 using Fisher matrix and sky-averaged sensitivity.
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Donutization Inside Neutron Stars: Shell-Localized Scalar Fields
Heavy scalar fields in neutron stars form interior shell-localized profiles that reshape the effective equation of state and break the I-Q relation while remaining hidden from binary pulsar observations.
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Thermodynamic Phase Transitions in Einstein-Maxwell-Scalar-Gauss-Bonnet Gravity
Scalarization in EMSGB gravity enables free-energy crossings between scalarized and Reissner-Nordström black holes, producing up to three phase transitions whose order changes with coupling strength.
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Phase transition structure of scalarized neutron stars: the effect of rotation and linear coupling
Linear coupling and rotation in scalar-tensor theories produce a complex phase transition landscape for scalarized neutron stars, with rotation increasing critical masses and Landau theory revealing overlooked solution branches.
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Scalarization and superradiant instability of black hole induced by dark matter halo in the scalar-tensor theory of gravity
Black holes with dark matter halos in scalar-tensor gravity exhibit scalarization and superradiant instability in some parameter regions, with halo size and mass affecting outcomes for small halos but coupling constant α dominating for large ones.
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Scalarizations of magnetized Reissner-Nordstr\"om black holes induced by parity-violating and parity-preserving interactions
Magnetic fields lower the scalarization threshold for electromagnetic and gravitational Chern-Simons couplings but produce opposite trends on the two Gauss-Bonnet branches, with nonlinear terms converting exponential growth into bounded oscillations.
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Equatorial Periodic Orbits and Gravitational Wave Phenomenology around Spherically-symmetric vacuum solution in Freund-Nambu scalar-tensor gravity
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