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Twilight for the energy conditions?
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The tension, if not outright inconsistency, between quantum physics and general relativity is one of the great problems facing physics at the turn of the millennium. Most often, the problems arising in merging Einstein gravity and quantum physics are viewed as Planck scale issues (10^{19} GeV, 10^{-34} m, 10^{-45} s), and so safely beyond the reach of experiment. However, over the last few years it has become increasingly obvious that the difficulties are more widespread: There are already serious problems of deep and fundamental principle at the semi-classical level, and worse, certain classical systems (inspired by quantum physics, but in no sense quantum themselves) exhibit seriously pathological behaviour. One manifestation of these pathologies is in the so-called ``energy conditions'' of general relativity. Patching things up in the gravity sector opens gaping holes elsewhere; and some ``fixes'' are more radical than the problems they are supposed to cure.
Forward citations
Cited by 11 Pith papers
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Black bounces to traversable wormholes from pure gravity in four and higher dimensions
Any static spherically symmetric wormhole or black bounce with a single integration constant can be made the unique vacuum solution of some specially constructed higher-dimensional pure-metric gravity theory.
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Null geodesic defocusing in dynamical black-hole-to-white-hole transitions
Dynamical black-hole-to-white-hole transitions require a violation of the null convergence condition for the trapped region to disappear and the anti-trapped region to form.
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Affine ANEC selects the closed FRW branch for geodesically complete cosmology
Affine ANEC obstructs non-static flat and open FRW from being null geodesically complete while ANEC-satisfying, but allows explicit scalar-field realizations for closed FRW with NEC-respecting matter.
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Violations of the null convergence condition in kinematical transitions between singular and regular black holes, horizonless compact objects, and bounces
During kinematical transitions between singular and regular black holes, horizonless compact objects, and bounces, the null convergence condition is violated even when both endpoint spacetimes respect it.
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Tidal Love numbers and quasi-normal modes of the Schwarzschild-Hernquist black hole
For a Schwarzschild black hole in a relativistic Hernquist dark matter halo, quasinormal-mode frequency shifts scale as (MDM/rs)^(3/2) rather than linearly, while tidal Love numbers are small and sensitive to the choi...
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Boson Stars in Teleparallel Gravity with a Nonminimally Coupled Field: The Violation of Energy Conditions and Gravitational Waveforms from EMRIs
Boson stars in teleparallel gravity with nonminimal coupling show negative energy density and energy-condition violation in excited states, with EMRI waveforms potentially detectable by LISA.
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Cosmic Strings as Dynamical Dark Energy: Novel Constraints
Cosmic string networks are constrained to less than ~1% of the energy density using CMB+BAO+SN data, with some models preferring mildly negative densities but no Bayesian evidence favoring them over LambdaCDM.
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Curvature conditions for generalized singularity theorems
Curvature conditions proposed for focal points of trapped submanifolds do not apply in general to codimensions higher than two, though they may for specific submanifolds.
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Revisiting Schwarzschild's constant density star in isotropic coordinates
Re-derivation of the constant-density star in isotropic coordinates produces a transparent metric and highlights under-appreciated special cases including pressure gravitating alone and naked singularities.
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Towards a Non-singular Paradigm of Black Hole Physics
This is a review built around a week-long workshop, synthesizing the state and open problems of regular black holes and black hole mimickers as alternatives to singular black holes.
- Wormhole geometries in modified gravity
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