Cvetic, M. Gibbons, G.W. Pope, C.N.

We study closed photon orbits in spherically symmetric static solutions of supergravity theories, a Horndeski theory, and a theory of quintessence. These orbits lie in what we shall call a photon sphere (antiphoton sphere) if the orbit is unstable (stable). We show that in all the asymptotically flat solutions we examine that admit a regular event ...

Cvetic, M. Gibbons, G.W. Pope, C.N.

We study closed photon orbits in spherically symmetric static solutions of supergravity theories, a Horndeski theory, and a theory of quintessence. These orbits lie in what we shall call a photon sphere (antiphoton sphere) if the orbit is unstable (stable). We show that in all the asymptotically flat solutions we examine that admit a regular event ...

Casals, Marc Fabbri, Alessandro Martínez, Cristián Zanelli, Jorge

We investigate semiclassical backreaction on a conical naked singularity space–time with a negative cosmological constant in (2+1) -dimensions. In particular, we calculate the renormalized quantum stress–energy tensor for a conformally coupled scalar field on such naked singularity space–time. We then obtain the backreacted metric via the semiclass...

Casals, Marc Fabbri, Alessandro Martínez, Cristián Zanelli, Jorge

We investigate semiclassical backreaction on a conical naked singularity space–time with a negative cosmological constant in (2+1) -dimensions. In particular, we calculate the renormalized quantum stress–energy tensor for a conformally coupled scalar field on such naked singularity space–time. We then obtain the backreacted metric via the semiclass...

Casals, Marc Fabbri, Alessandro Martínez, Cristián Zanelli, Jorge

We investigate semiclassical backreaction on a conical naked singularity space–time with a negative cosmological constant in (2+1) -dimensions. In particular, we calculate the renormalized quantum stress–energy tensor for a conformally coupled scalar field on such naked singularity space–time. We then obtain the backreacted metric via the semiclass...

Casals, Marc Fabbri, Alessandro Martínez, Cristián Zanelli, Jorge

We investigate semiclassical backreaction on a conical naked singularity space–time with a negative cosmological constant in (2+1) -dimensions. In particular, we calculate the renormalized quantum stress–energy tensor for a conformally coupled scalar field on such naked singularity space–time. We then obtain the backreacted metric via the semiclass...

Cvetic, M. Gibbons, G.W. Pope, C.N.

We study closed photon orbits in spherically symmetric static solutions of supergravity theories, a Horndeski theory, and a theory of quintessence. These orbits lie in what we shall call a photon sphere (antiphoton sphere) if the orbit is unstable (stable). We show that in all the asymptotically flat solutions we examine that admit a regular event ...

Casals, Marc Fabbri, Alessandro Martínez, Cristián Zanelli, Jorge

We investigate semiclassical backreaction on a conical naked singularity space–time with a negative cosmological constant in (2+1) -dimensions. In particular, we calculate the renormalized quantum stress–energy tensor for a conformally coupled scalar field on such naked singularity space–time. We then obtain the backreacted metric via the semiclass...

Cvetic, M. Gibbons, G.W. Pope, C.N.

We study closed photon orbits in spherically symmetric static solutions of supergravity theories, a Horndeski theory, and a theory of quintessence. These orbits lie in what we shall call a photon sphere (antiphoton sphere) if the orbit is unstable (stable). We show that in all the asymptotically flat solutions we examine that admit a regular event ...

Casals, Marc Fabbri, Alessandro Martínez, Cristián Zanelli, Jorge

We investigate semiclassical backreaction on a conical naked singularity space–time with a negative cosmological constant in (2+1) -dimensions. In particular, we calculate the renormalized quantum stress–energy tensor for a conformally coupled scalar field on such naked singularity space–time. We then obtain the backreacted metric via the semiclass...