1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- ETH ZurichCH96 papers
- Tokyo University of ScienceJP12 papers
- KTH Royal Institute of TechnologySE10 papers
- McGill UniversityCA10 papers
- Stockholm UniversitySE10 papers
- Centre National de la Recherche ScientifiqueFR9 papers
- Nordic Institute for Theoretical PhysicsSE8 papers
- Universidad Autónoma de MadridES7 papers
- Aix-Marseille UniversitéFR6 papers
- Heidelberg UniversityDE6 papers
- Instituto de Física TeóricaES6 papers
- Kyoto UniversityJP6 papers
16 papers · 1 filter
Horndeski under the quantum loupe
Lavinia Heisenberg, Johannes Noller, Jann Zosso
With recent constraints on the propagation speed of gravitational waves, the class of scalar-tensor theories has significantly been reduced. We consider one of the surviving models…
On gravitational waves in Born-Infeld inspired non-singular cosmologies
Jose Beltran Jimenez, Lavinia Heisenberg, Gonzalo J. Olmo +1
We study the evolution of gravitational waves for non-singular cosmological solutions within the framework of Born-Infeld inspired gravity theories, with special emphasis on the Ed…
Instabilities in Horndeski Yang-Mills inflation
Jose Beltran Jimenez, Lavinia Heisenberg, Ryotaro Kase +2
A non-abelian gauge field with a non-minimal Horndeski coupling to gravity gives rise to a de Sitter solution followed by a graceful exit to a radiation-dominated epoch. In…
Note on Reheating in G-inflation
Hossein Bazrafshan Moghaddam, Robert Brandenberger, Jun'ichi Yokoyama
We study particle production at the end of inflation in kinetically driven G-inflation model and show that, in spite of the fact that there are no inflaton oscillations and hence n…
Doubly coupled matter fields in massive bigravity
Xian Gao, Lavinia Heisenberg
In the context of massive (bi-)gravity non-minimal matter couplings have been proposed. These couplings are special in the sense that they are free of the Boulware-Deser ghost belo…
Particle Production in Ekpyrotic Scenarios
W. S. Hipolito-Ricaldi, Robert Brandenberger, Elisa G. M. Ferreira +1
We consider Parker particle production in the Ekpyrotic scenario (in particular in the New Ekpyrotic model) and show that the density of particles produced by the end of the phase…
Beyond generalized Proca theories
Lavinia Heisenberg, Ryotaro Kase, Shinji Tsujikawa
We consider higher-order derivative interactions beyond second-order generalized Proca theories that propagate only the three desired polarizations of a massive vector field beside…
New Quasidilaton theory in Partially Constrained Vielbein Formalism
Antonio De Felice, A. Emir Gümrükçüoğlu, Lavinia Heisenberg +2
In this work we study the partially constrained vielbein formulation of the new quasidilaton theory of massive gravity which couples to both physical and fiducial metrics simultane…
Bouncing Cosmologies: Progress and Problems
Robert Brandenberger, Patrick Peter
We review the status of bouncing cosmologies as alternatives to cosmological inflation for providing a description of the very early universe, and a source for the cosmological per…
Holographic Curvature Perturbations in a Cosmology with a Space-Like Singularity
Elisa G. M. Ferreira, Robert Brandenberger
We study the evolution of cosmological perturbations in an anti-de-Sitter (AdS) bulk through a cosmological singularity by mapping the dynamics onto the boundary conformal fields t…
Cosmology for quadratic gravity in generalized Weyl geometry
Jose Beltran Jimenez, Lavinia Heisenberg, Tomi S. Koivisto
A class of vector-tensor theories arises naturally in the framework of quadratic gravity in spacetimes with linear vector distortion. Requiring the absence of ghosts for the vector…
Derivative self-interactions for a massive vector field
Jose Beltrán Jiménez, Lavinia Heisenberg
In this work we revisit the construction of theories for a massive vector field with derivative self-interactions such that only the 3 desired polarizations corresponding to a Proc…
Initial Conditions for Inflation - A Short Review
Robert Brandenberger
I give a brief review of the status of research on the nature of initial conditions required to obtain a period of cosmological inflation. It is shown that there is good evidence t…
Preheating and Entropy Perturbations in Axion Monodromy Inflation
Evan McDonough, Hossein Bazrafshan Moghaddam, Robert H. Brandenberger
We study the preheating of gauge fields in a simple axion monodromy model and compute the induced entropy perturbations and their effect on the curvature fluctuations. We find that…
Derivative couplings in massive bigravity
Xian Gao, Lavinia Heisenberg
In this work we study the cosmological perturbations in massive bigravity in the presence of non-minimal derivative couplings. For this purpose we consider a specific subclass of H…
Matter coupling in partially constrained vielbein formulation of massive gravity
Antonio De Felice, A. Emir Gümrükçüoğlu, Lavinia Heisenberg +1
We consider a consistent linear effective vielbein matter coupling without introducing the Boulware-Deser ghost in ghost-free massive gravity. This is achieved in the partially con…