513 citations · 6.8k across the 165 of their papers we have counts for
36 papers · 1 filter
Constraining Dark Energy from Local Group dynamics
D. Benisty, A. -C. Davis, N. W. Evans
This Letter develops a method to constrain the Cosmological Constant from binary galaxies, focusing on the Milky Way and Andromeda. We provide an analytical solution to the two…
Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
Elcio Abdalla, Guillermo Franco Abellán, Amin Aboubrahim +200
In this paper we will list a few important goals that need to be addressed in the next decade, also taking into account the current discordances between the different cosmological…
Dark energy interactions near the galactic centre
David Benisty, Anne-Christine Davis
We investigate scalar-tensor theories, motivated by dark energy models, in the strong gravity regime around the black hole at the centre of our galaxy. In such theories general rel…
Constraints on Chameleon f(R)-Gravity from Galaxy Rotation Curves of the SPARC Sample
Aneesh P. Naik, Ewald Puchwein, Anne-Christine Davis +2
In chameleon -gravity, the fifth force will lead to `upturns' in galaxy rotation curves near the screening radius. The location of the upturn depends on the cosmic background…
Imprints of Chameleon f(R) Gravity on Galaxy Rotation Curves
Aneesh P. Naik, Ewald Puchwein, Anne-Christine Davis +1
Current constraints on gravity are relatively weak on galactic and intergalactic scales. Screened modified gravity models can exhibit complex behaviour there without violating stri…
Neutron star merger GW170817 strongly constrains doubly coupled bigravity
Yashar Akrami, Philippe Brax, Anne-Christine Davis +1
We study the implications of the recent detection of gravitational waves emitted by a pair of merging neutron stars and their electromagnetic counterpart, events GW170817 and GRB17…
Signatures of graviton masses on the CMB
Philippe Brax, Sebastian Cespedes, Anne-Christine Davis
The impact of the existence of gravitons with non-vanishing masses on the B modes of the Cosmic Microwave Background (CMB) is investigated. We also focus on putative modifications…
One-electron atoms in screened modified gravity
Leong Khim Wong, Anne-Christine Davis
In a large class of scalar-tensor theories that are potential candidates for dark energy, a nonminimal coupling between the scalar and the photon is possible. The presence of such…
Atomic Interferometry Test of Dark Energy
Philippe Brax, Anne-Christine Davis
Atomic interferometry can be used to probe dark energy models coupled to matter. We consider the constraints coming from recent experimental results on models generalising the inve…
Searching for scalar gravitational interactions in current and future cosmological data
Alireza Hojjati, Aaron Plahn, Alex Zucca +4
Modified gravity theories often contain a scalar field of gravitational strength which interacts with matter. We examine constraints on the range and the coupling strength of a sca…
Cosmological Tests of Coupled Galileons
Philippe Brax, Clare Burrage, Anne-Christine Davis +1
We investigate the cosmological properties of Galileon models with positive kinetic terms. We include both conformal and disformal couplings to matter and focus on constraints on t…
Astrophysical black holes in screened modified gravity
Anne-Christine Davis, Ruth Gregory, Rahul Jha +1
Chameleon, environmentally dependent dilaton, and symmetron gravity are three models of modified gravity in which the effects of the additional scalar degree of freedom are screene…
Early Modified Gravity: Implications for Cosmology
Philippe Brax, Carsten van de Bruck, Sebastien Clesse +2
We study the effects of modifications of gravity after Big Bang Nucleosynthesis (BBN) which would manifest themselves mainly before recombination. We consider their effects on the…
Novel Probes of Gravity and Dark Energy
Bhuvnesh Jain, Austin Joyce, Rodger Thompson +29
The discovery of cosmic acceleration has stimulated theorists to consider dark energy or modifications to Einstein's General Relativity as possible explanations. The last decade ha…
Cosmological Tests of the Disformal Coupling to Radiation
Philippe Brax, Clare Burrage, Anne-Christine Davis +1
Light scalar fields can naturally couple disformally to Standard Model fields without giving rise to the unacceptably large fifth forces usually associated with light scalars. We s…
Systematic simulations of modified gravity: chameleon models
Philippe Brax, Anne-C. Davis, Baojiu Li +2
In this work we systematically study the linear and nonlinear structure formation in chameleon theories of modified gravity, using a generic parameterisation which describes a larg…
Dynamics of Supersymmetric Chameleons
Philippe Brax, Anne-Christine Davis, Jeremy Sakstein
We investigate the cosmological dynamics of a class of supersymmetric chameleon models coupled to cold dark matter fermions. Supergravity corrections ensure that these models are e…
Signatures of Modified Gravity on the 21-cm Power Spectrum at Reionisation
Philippe Brax, Sébastien Clesse, Anne-Christine Davis
Scalar modifications of gravity have an impact on the growth of structure. Baryon and Cold Dark Matter (CDM) perturbations grow anomalously for scales within the Compton wavelength…
Systematic simulations of modified gravity: symmetron and dilaton models
Philippe Brax, Anne-Christine Davis, Baojiu Li +2
We study the linear and nonlinear structure formation in the dilaton and symmetron models of modified gravity using a generic parameterisation which describes a large class of scen…
A Unified Description of Screened Modified Gravity
Philippe Brax, Anne-Christine Davis, Baojiu Li +1
We consider modified gravity models driven by a scalar field whose effects are screened in high density regions due to the presence of non-linearities in its interaction potential…
The Cosmological Supersymmetron
Philippe Brax, Anne-Christine Davis, Hans A. Winther
Recently, a supersymmetric model of dark energy coupled to cold dark matter, the supersymmetron, has been proposed. In the absence of cold dark matter, the supersymmetron field con…
Modified Gravity Tomography
Philippe Brax, Anne-Christine Davis, Baojiu Li
We consider the effect of a scalar field degree of freedom on the dynamics of gravity from small to large scales. We show that the effects of modified gravity can be completely cap…
The Importance of Slow-roll Corrections During Multi-field Inflation
Anastasios Avgoustidis, Sera Cremonini, Anne-Christine Davis +3
We re-examine the importance of slow-roll corrections during the evolution of cosmological perturbations in models of multi-field inflation. We find that in many instances the pres…
Chameleon Gravity, Electrostatics, and Kinematics in the Outer Galaxy
R. Pourhasan, N. Afshordi, R. B. Mann +1
Light scalar fields are expected to arise in theories of high energy physics (such as string theory), and find phenomenological motivations in dark energy, dark matter, or neutrino…