Troels Harmark
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View article: Strong-gravity precession resonances for binary systems orbiting a Schwarzschild black hole
Strong-gravity precession resonances for binary systems orbiting a Schwarzschild black hole Open
Binary systems of compact objects in close orbit around a supermassive black hole (SMBH) may form in galactic nuclei, providing a unique environment to probe strong-gravity tidal effects on the binary's dynamics. In this work, we investiga…
View article: Gravitational solitons and non-relativistic string theory
Gravitational solitons and non-relativistic string theory Open
A bstract We explore the non-relativistic string theory (NRST) limit of type II string theory and its action on gravitational solitons. As a start, we exhibit in detail that the NRST limit is T-dual to a discrete lightcone limit and can be…
View article: Conformal mapping of non-Lorentzian geometries in SU(1, 2) Conformal Field Theory
Conformal mapping of non-Lorentzian geometries in SU(1, 2) Conformal Field Theory Open
A bstract We realize an explicit conformal mapping between the state and operator pictures in a class of (2 + 1)-dimensional non-Lorentzian field theories with SU(1, 2) × U(1) conformal symmetry. The state picture arises from null reducing…
View article: Gravitational solitons and non-relativistic string theory
Gravitational solitons and non-relativistic string theory Open
We explore the non-relativistic string theory (NRST) limit of type II string theory and its action on gravitational solitons. As a start, we exhibit in detail that the NRST limit is T-dual to a discrete lightcone limit and can be viewed as…
View article: Conformal Mapping of Non-Lorentzian Geometries in SU(1,2) Conformal Field Theory
Conformal Mapping of Non-Lorentzian Geometries in SU(1,2) Conformal Field Theory Open
We realize an explicit conformal mapping between the state and operator pictures in a class of (2+1)-dimensional non-Lorentzian field theories with SU(1,2)$\times$U(1) conformal symmetry. The state picture arises from null reducing four-di…
View article: Hagedorn temperature from the thermal scalar in AdS and pp-wave backgrounds
Hagedorn temperature from the thermal scalar in AdS and pp-wave backgrounds Open
A bstract We propose a thermal scalar equation of motion (EOM) that takes into account curvature corrections for backgrounds supported by Ramond-Ramond fluxes. This can be used to obtain the Hagedorn temperature for type II string theory o…
View article: Binary mergers in strong gravity background of Kerr black hole
Binary mergers in strong gravity background of Kerr black hole Open
Binary-black-hole (BBH) mergers can take place close to a supermassive black hole (SMBH) while being in a bound orbit around the SMBH. In this paper, we study such bound triple systems and show that including the strong gravity effects of …
View article: Hagedorn temperature from the thermal scalar in AdS and pp-wave backgrounds
Hagedorn temperature from the thermal scalar in AdS and pp-wave backgrounds Open
We propose a thermal scalar equation of motion (EOM) that takes into account curvature corrections for backgrounds supported by Ramond-Ramond fluxes. This can be used to obtain the Hagedorn temperature for type II string theory on AdS and …
View article: Blandford-Znajek jets in MOdified Gravity
Blandford-Znajek jets in MOdified Gravity Open
General relativity (GR) will be imminently challenged by upcoming experiments in the strong gravity regime, including those testing the energy extraction mechanisms for black holes. Motivated by this, we explore magnetospheric models and b…
View article: Longitudinal Galilean and Carrollian limits of non-relativistic strings
Longitudinal Galilean and Carrollian limits of non-relativistic strings Open
A bstract It is well known that one can take an infinite speed of light limit that gives rise to non-relativistic strings with a relativistic worldsheet sigma model but with a non-relativistic target space geometry. In this work we systema…
View article: Binary mergers in strong gravity background of Kerr black hole
Binary mergers in strong gravity background of Kerr black hole Open
Binary-black-hole (BBH) mergers can take place close to a supermassive black hole (SMBH) while being in a bound orbit around the SMBH. In this paper, we study such bound triple systems and show that including the strong gravity effects of …
View article: Longitudinal Galilean and Carrollian limits of non-relativistic strings
Longitudinal Galilean and Carrollian limits of non-relativistic strings Open
It is well known that one can take an infinite speed of light limit that gives rise to non-relativistic strings with a relativistic worldsheet sigma model but with a non-relativistic target space geometry. In this work we systematically ex…
View article: Blandford-Znajek jets in MOdified Gravity
Blandford-Znajek jets in MOdified Gravity Open
General relativity (GR) will be imminently challenged by upcoming experiments in the strong gravity regime, including those testing the energy extraction mechanisms for black holes. Motivated by this, we explore magnetospheric models and b…
View article: 2.5PN accurate waveform information for generic-planar-orbit binaries in effective one-body models
2.5PN accurate waveform information for generic-planar-orbit binaries in effective one-body models Open
We provide the post-Newtonian (PN) waveform for binary systems in motion along generic planar orbits at 2.5PN accuracy, in terms of the dynamical variables of the effective one-body (EOB) formalism. In addition to the calculation of the hi…
View article: Tidal deformations of a binary system induced by an external Kerr black hole
Tidal deformations of a binary system induced by an external Kerr black hole Open
The dynamics of a binary system moving in the background of a black hole is affected by tidal forces. In this work, for the Kerr black hole, we derive the electric and magnetic tidal moments at quadrupole order, where the latter are comput…
View article: The Panorama of Spin Matrix Theory
The Panorama of Spin Matrix Theory Open
Spin Matrix theory describes near-BPS limits of $\mathcal{N}=4$ SYM theory, which enables us to probe finite $N$ effects like D-branes and black hole physics. In previous works, we have developed the spherical reduction and spin chain meth…
View article: Blandford--Znajek monopole expansion revisited: novel non-analytic contributions to the power emission
Blandford--Znajek monopole expansion revisited: novel non-analytic contributions to the power emission Open
The Blandford and Znajek (BZ) split-monopole serves as an important theoretical example of the mechanism that can drive the electromagnetic extraction of energy from Kerr black holes. It is constructed as a perturbative low spin solution o…
View article: Solving the Hagedorn temperature of AdS5/CFT4 via the Quantum Spectral Curve: Chemical potentials and deformations
Solving the Hagedorn temperature of AdS5/CFT4 via the Quantum Spectral Curve: Chemical potentials and deformations Open
We describe how to calculate the Hagedorn temperature of $\mathcal{N}=4$ SYM theory and type IIB superstring theory on $AdS_5\times S^5$ via the Quantum Spectral Curve (QSC) -- providing further details on our previous letters 1706.03074 a…
View article: Nonrelativistic near-BPS corners of $$ \mathcal{N} $$ = 4 super-Yang-Mills with SU(1, 1) symmetry
Nonrelativistic near-BPS corners of $$ \mathcal{N} $$ = 4 super-Yang-Mills with SU(1, 1) symmetry Open
A bstract We consider limits of $$ \mathcal{N} $$ = 4 super Yang-Mills (SYM) theory that approach BPS bounds and for which an SU(1,1) structure is preserved. The resulting near-BPS theories become non-relativistic, with a U(1) symmetry eme…
View article: Symmetry structure of the interactions in near-BPS corners of N = 4 super-Yang-Mills
Symmetry structure of the interactions in near-BPS corners of N = 4 super-Yang-Mills Open
We consider limits of N = 4 super-Yang-Mills (SYM) theory that approach BPS bounds. These limits result in non-relativistic near-BPS theories that describe the effective dynamics near the BPS bounds and upon quantization are known as Spin …
View article: Existence of the Blandford-Znajek monopole for a slowly rotating Kerr black hole
Existence of the Blandford-Znajek monopole for a slowly rotating Kerr black hole Open
The Blandford-Znajek monopole is a conjectured solution of force-free electrodynamics in the vicinity of a slowly rotating Kerr black hole, supposedly defined as a perturbation in small angular momentum. It is used to argue for the extract…