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118 papers · 1 filter
Universal lower bound on orbital periods around central compact objects
Shahar Hod
It is proved, using the curved line element of a spherically symmetric charged object in general relativity and the Schwinger discharge mechanism of quantum field theory, that the…
What can a detected photon with a given gravitational redshift tell us about the maximum density of a compact star?
Shahar Hod
Far away observers can in principle bound from below the dimensionless maximum-density parameter of a compact star by measuring the gravitational redsh…
Charged Gauss-Bonnet black holes supporting non-minimally coupled scalar clouds: Analytic treatment in the near-critical regime
Shahar Hod
Recent numerical studies have revealed the physically intriguing fact that charged black holes whose charge-to-mass ratios are larger than the critical value $(Q/M)_{\text{crit}}=\…
Extremal black holes have external light rings
Shahar Hod
It is proved that spherically symmetric extermal black holes possess at least one external light ring. Our remarkably compact proof is based on the dominant energy condition which…
How short can stationary charged scalar hair be?
Shahar Hod
It is by now well established that charged rotating Kerr-Newman black holes can support bound-state charged matter configurations which are made of minimally coupled massive scalar…
Spin-charge induced scalarization of Kerr-Newman black-hole spacetimes
Shahar Hod
It has recently been demonstrated that Reissner-Nordström black holes in composed Einstein-Maxwell-scalar field theories can support static scalar field configurations with a non-m…