540 citations · 2.4k across the 44 of their papers we have counts for
13 papers · 1 filter
Axions, Three-Forms, and M-Theory
Florian Niedermann, Ziqi Yan
Scalar fields with masses protected by global shift symmetries, commonly referred to as axions, are abundantly used in effective field theories in cosmology and particle physics. H…
Higher co-dimension de Sitter branes
Florian Niedermann, Antonio Padilla
We extend the arguments of Maldacena and Núñez to include higher co-dimension brane setups and derive a new no-go theorem. Specifically, we show that under reasonable assumptions o…
Perturbative quantum consistency near black-hole horizon formation
Stefan Hofmann, Maximilian Koegler, Florian Niedermann
We study the prelude to black-hole formation using a suspended shell composed of physical matter that fulfills the dominant energy condition. Here, the collapse of the shell is bro…
Deconstructing higher order clockwork gravity
Anastasios Avgoustidis, Florian Niedermann, Antonio Padilla +1
We consider the higher order clockwork theory of gravitational interactions, whereby a number of gravitons are coupled together with TeV strength, but nevertheless generate a Planc…
Quantum corrections to vacuum energy sequestering (with monodromy)
Basem Kamal El-Menoufi, Silvia Nagy, Florian Niedermann +1
Field theory models of axion monodromy have been shown to exhibit vacuum energy sequestering as an emergent phenomenon for cancelling radiative corrections to the cosmological cons…
Higher Order Clockwork Gravity
Florian Niedermann, Antonio Padilla, Paul M. Saffin
We present a higher order generalisation of the clockwork mechanism starting from an underlying non-linear multigravity theory with a single scale and nearest neighbour ghost-free…
Rotating kinky braneworlds
Florian Niedermann, Paul M. Saffin
Cylindrical braneworlds have been used in the literature as a convenient way to resolve co-dimension-two branes. They are prevented from collapsing by a massless worldvolume field…
Non-perturbative aspects of galileon duality
Peter Millington, Florian Niedermann, Antonio Padilla
We study quantum aspects of the galileon duality, especially in the case of a particular interacting galileon theory that is said to be dual to a free theory through the action of…
Gravitational Mechanisms to Self-Tune the Cosmological Constant: Obstructions and Ways Forward
Florian Niedermann, Antonio Padilla
Gravitational models of self-tuning are those in which vacuum energy has no observable effect on spacetime curvature, even though it is a priori unsuppressed below the cut-off. We…
SLED Phenomenology: Curvature vs. Volume
Florian Niedermann, Robert Schneider
We assess the question whether the SLED (Supersymmetric Large Extra Dimensions) model admits phenomenologically viable solutions with 4D maximal symmetry. We take into account a fi…
Fine-tuning with Brane-Localized Flux in 6D Supergravity
Florian Niedermann, Robert Schneider
There are claims in the literature that the cosmological constant problem could be solved in a braneworld model with two large (micron-sized) supersymmetric extra dimensions. The m…
Microscopic Picture of Non-Relativistic Classicalons
Felix Berkhahn, Sophia Müller, Florian Niedermann +1
A theory of a non-relativistic, complex scalar field with derivatively coupled interaction terms is investigated. This toy model is considered as a prototype of a classicalizing th…
Brane Induced Gravity: From a No-Go to a No-Ghost Theorem
Felix Berkhahn, Stefan Hofmann, Florian Niedermann
Numerous claims in the literature suggest that gravity induced on a higher co-dimensional surface violates unitarity in the weak coupling regime. However, it remained unclear, why…