I am a phenomenologist and I work to tie together physical theories and cosmological observations.
My theoretical and methodological research is focused on advancing our theoretical understanding
and our modeling capabilities to enable the full exploitation of present and future measurements.
In particular I am focusing my research on Dark Energy, Dark Matter, cosmological neutrinos and Gravity.
I am also interested in testing the overall level of agreement of different
experiments within the standard cosmological model.

Scroll down to find more information about my research interests
and publications.

Marco Raveri

The University of Pennsylvania, Center for Particle Cosmology,

Department of Physics and Astronomy,

209 South 33rd Street,

Philadelphia, PA 19104

(+1) 312 2927043

mraveri@sas.upenn.edu

A Universe described by General Relativity and filled with ordinary matter is naturally expected to experience decelerated expansion. One of the most remarkable results of contemporary observational cosmology is the evidence that this is not the case. This *cosmic acceleration* is today one of the few evidences of the existence of physical phenomena beyond what we already know.

How we can build working models of this phenomenon? How we can test them? What cosmological probes can we use to distinguish between different candidate models?

As we gather more and more precise measurements small hints of discrepancies between different cosmological probes appeared. The expansion rate of the Universe as derived from cosmic microwave background observations differs from direct measurements from the distance ladder. Measurements from large scale structure surveys and the cosmic microwave background show different pictures of how cosmological structures grew over time. How significant are these discrepancies? Can they point toward a radical re-evaluation of our cosmological model? Are they just due to residual systematic effects?

- Dark matter, dark radiation and neutrinos in the Universe;
- Large Scale Structure probes of fundamental physics;
- Statistical and computational methods in cosmology;
- Cosmological perturbation theory;
- How to test new physics with cosmological observations;
- Any new cosmological probe;
- Non-standard explanations of cosmic acceleration.

INSPIRE LINK to my publications

- Dark Energy Survey Year 1 Results: Constraints on Extended Cosmological Models from Galaxy Clustering and Weak Lensing (arXiv:1810.02499)
- Phenomenology of Modified Gravity at Recombination (arXiv:1810.02333)
- K-mouflage Imprints on Cosmological Observables and Data Constraints (arXiv:1809.09958)
- Phenomenology of Large Scale Structure in scalar-tensor theories: joint prior covariance of wDE, mu, Sigma in Horndeski (arXiv:1809.01121)
- Concordance and Discordance in Cosmology (arXiv:1806.04649)

- Large-scale structure phenomenology of viable Horndeski theories (PRD 2018)
- Neutrino Mass Priors for Cosmology from Random Matrices (PRD 2018)
- Do current cosmological observations rule out all Covariant Galileons? (PRD 2018)
- Comparison of Einstein-Boltzmann solvers for testing general relativity (PRD 2018)
- Partially Acoustic Dark Matter Cosmology and Cosmological Constraints (PRD 2017)
- Priors on the effective Dark Energy equation of state in scalar-tensor theories (PRD 2017)
- Impact of theoretical priors in cosmological analyses:

the case of single field quintessence (PRD 2017) - Dynamical dark energy in light of the latest observations (Nature Astronomy 2017)
- Constraining f(R) Gravity with Planck Sunyaev-Zel'dovich Clusters (PRD 2017)
- Testing Hu–Sawicki f(R) gravity with the effective field theory approach (MNRAS 2016)
- Are cosmological data sets consistent with each other within the Lambda cold dark matter model? (PRD 2016)
- Horava Gravity in the Effective Field Theory formalism: From cosmology to observational constraints (PDU 2016)
- Can modified gravity models reconcile the tension between CMB anisotropy and lensing maps in Planck-like observations? (PRD 2015)
- Exploring massive neutrinos in dark cosmologies with EFTCAMB/EFTCosmoMC (PRD 2015)
- Measuring the speed of cosmological gravitational waves (PRD 2015)
- Effective Field Theory of Cosmic Acceleration: constraining dark energy with CMB data (PRD 2014)
- Effective Field Theory of Cosmic Acceleration: an implementation in CAMB (PRD 2014)
- Effective Field Theory of Dark Energy: a Dynamical Analysis (JCAP 2014)

- EFTCAMB/EFTCosmoMC: Numerical Notes v3.0 (arXiv:1405.3590)
- CosmicFish Implementation Notes V1.0 (arXiv:1606.06268)

The marginalized joint posterior of a subset of parameters of the K-mouflage model and the Hubble constant. In all three panels different colors correspond to different combination of cosmological probes, as shown in legend. The darker and lighter shades correspond respectively to the 68% C.L. and the 95% C.L. regions.

The CMB anisotropy source functions in k-space in units of amplitude of primordial comoving curvature perturbation in two MG example models and GR. Different lines correspond to different physical effects and models, as shown in figure and legend. The vertical dashed line shows mode that crosses the horizon at recombination.

The statistical significance of different Concordance and Discordance Estimators for various data set couples: the difference in log-likelihood at maximum posterior (MAP), the update parameter shifts test, the exact 1D parameter shifts, and the “rule of thumb difference in mean”. Different colors indicate different tests, as shown in legend. The labels report different levels of statistical significance: P1 ≡ 32%, P2 ≡ 5%, P3 ≡ 0.3%, P4 ≡ 0.007%. Values that are identified as failure modes of one of the estimators are not shown in figure. The darker shade indicates results that are not statistically significant.

EFTCAMB is a patch of the public Einstein-Boltzmann solver CAMB, which implements the Effective Field Theory approach to cosmic acceleration. The code can be used to investigate the effect of different EFT operators on linear perturbations as well as to study perturbations in any specific DE/MG model that can be cast into EFT framework. To interface EFTCAMB with cosmological data sets, we equipped it with a modified version of CosmoMC, namely EFTCosmoMC, creating a bridge between the EFT parametrization of the dynamics of perturbations and observations.

CosmicFish is a forecasting tool to study what future cosmology will look like. This tools is using EFTCAMB and MGCAMB to ensure maximum coverage of cosmological models and will serve two important purposes. At first it will allow to optimise model testing, forecasting the expected constraints on several models and parametrizations to select the ones that are better constrained by the data. In the second place it will allow the design and optimization of experimental probes that aim at testing gravitational theories.