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Particle Creation in a Cosmological Background in Analogy to the Schwinger Effect
Walter D. van Suijlekom, Michael F. Wondrak, Heino Falcke
We consider a gravitational analogue of the Schwinger effect in a cosmological context. While the Schwinger effect is usually attributed to a static electric background, its deriva…
An upper limit to the lifetime of stellar remnants from gravitational pair production
Heino Falcke, Michael F. Wondrak, Walter D. van Suijlekom
Black holes are assumed to decay via Hawking radiation. Recently we found evidence that spacetime curvature alone without the need for an event horizon leads to black hole evaporat…
Reply to "Comment on 'Gravitational Pair Production and Black Hole Evaporation'"
Michael F. Wondrak, Walter D. van Suijlekom, Heino Falcke
In a recent letter, the authors presented a unified derivation of the electric Schwinger effect and a generalized Hawking effect with an additional radiation component. The approac…
Gravitational Pair Production and Black Hole Evaporation
Michael F. Wondrak, Walter D. van Suijlekom, Heino Falcke
We present a new avenue to black hole evaporation using a heat-kernel approach analogous as for the Schwinger effect. Applying this method to an uncharged massless scalar field in…
Probing Quadratic Gravity with the Event Horizon Telescope
Jesse Daas, Kolja Kuijpers, Frank Saueressig +2
Quadratic gravity constitutes a prototypical example of a perturbatively renormalizable quantum theory of the gravitational interactions. In this work, we construct the associated…
Constraints on the String T-Duality Propagator from the Hydrogen Atom
Michael F. Wondrak, Marcus Bleicher
We investigate the implications of a string-theory modified propagator in the high-precision regime of quantum mechanics. In particular, we examine the situation in which string th…
Quantum Corrected Black Holes from String T-Duality
Piero Nicolini, Euro Spallucci, Michael F. Wondrak
In this paper we present some stringy corrections to black hole spacetimes emerging from string T-duality. As a first step, we derive the static Newtonian potential by exploiting t…
Superradiance in Modified Gravity (MOG)
Michael F. Wondrak, Piero Nicolini, John W. Moffat
We consider the case of rotating black holes in a dark-matter-emulating theory of gravity called MOG. The latter introduces a gravitational vector field with an associated gravitat…
Black Holes and High Energy Physics: From Astrophysics to Large Extra Dimensions
Michael Florian Wondrak, Marcus Bleicher, Piero Nicolini
Up to now, Einstein's general theory of relativity has passed all experimental tests. But yet we know that it is not a fundamental theory and that it is incompatible with quantum t…
The Cosmological Constant and its Problems: A Review of Gravitational Aether
Michael Florian Wondrak
In this essay we offer a comprehensible overview of the gravitational aether scenario. This is a possible extension of Einstein's theory of relativity to the quantum regime via an…