253 citations · 694 across the 11 of their papers we have counts for
18 papers
Spinning Guest Fields during Inflation: Leftover Signatures
Emanuela Dimastrogiovanni, Matteo Fasiello, A. Emir Gumrukcuoglu
We consider the possibility of extra spinning particles during inflation, focussing on the spin-2 case. Our analysis relies on the well-known fully non-linear formulation of intera…
Hořava Gravity after GW170817
A. Emir Gumrukcuoglu, Mehdi Saravani, Thomas P. Sotiriou
The recent detection of gravitational wave GW170817 has placed a severe bound on the deviation of the speed of gravitational waves from the speed of light. We explore the consequen…
Revisiting the cuscuton as a Lorentz-violating gravity theory
Jishnu Bhattacharyya, Andrew Coates, Mattia Colombo +2
The cuscuton is a scalar field with infinite speed of propagation. It was introduced in the context of cosmology but it has also been claimed to resemble Horava gravity in a certai…
The uninvited guest in mixed derivative Hořava Gravity
Andrew Coates, Mattia Colombo, A. Emir Gumrukcuoglu +1
We revisit the mixed derivative extension of Hořava gravity which was designed to address the naturalness problems of the standard theory in the presence of matter couplings. We co…
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…
Horava Gravity with Mixed Derivative Terms: Power-Counting Renormalizability with Lower-Order Dispersions
Mattia Colombo, A. Emir Gumrukcuoglu, Thomas P. Sotiriou
It has been argued that Horava gravity needs to be extended to include terms that mix spatial and time derivatives in order avoid unacceptable violations of Lorentz invariance in t…