40 citations · 101 across the 8 of their papers we have counts for
13 papers · 1 filter
Ghost instabilities and strong coupling in quadratic non-metricity theories
Alexander Ganz, Marco Spinelli
We revisit the framework of Newer General Relativity, defined by all independent quadratic invariants of the non-metricity tensor, including the unique quadratic parity-violating t…
Bispectrum from inflation/bouncing Universe in VCDM
Alexander Ganz, Paul Martens, Shinji Mukohyama +1
We discuss the non-linear interactions within the VCDM model, a type II minimally modified gravity model with the same number of degrees of freedom as in General Relativity but not…
Parametric resonance of gravitational waves in general scalar-tensor theories
Yi-Fu Cai, Guillem Domènech, Alexander Ganz +3
Gravitational waves offer a potent mean to test the underlying theory of gravity. In general theories of gravity, such as scalar-tensor theories, one expects modifications in the f…
Disformal symmetry in the Universe: mimetic gravity and beyond
Guillem Domènech, Alexander Ganz
Symmetries play an important role in fundamental physics. In gravity and field theories, particular attention has been paid to Weyl (or conformal) symmetry. However, once the theor…
Bouncing Cosmology in VCDM
Alexander Ganz, Paul Martens, Shinji Mukohyama +1
We construct an asymmetric bouncing scenario within the VCDM model - also known as type-II minimally modified gravity -, a modified gravity theory with two local physical degrees o…
Graviton to Photon Conversion via Parametric Resonance
Robert Brandenberger, Paola C. M. Delgado, Alexander Ganz +1
We study the parametric resonance excitation of the electromagnetic field by a gravitational wave. We show that there is narrow band resonance. For an electromagnetic field in the…