School of Mathematics, Statistics and Physics

Staff Profile

Dr Gerasimos Rigopoulos

Lecturer in Applied Mathematics/Theoretical Physics

Background

Roles and Responsibilities



Research

Research Interests

Google Scholar

Early Universe Cosmology: Inflation, quantum theory of inflationary perturbations and its stochastic formulation, quantum fields in DeSitter and quasi-DeSitter, implications for quantum gravity.

Late Universe Cosmology: Effective theories of cosmological perturbations, semi-analytic methods for the quasi-linear and non-linear regime of structure formation.


Postgraduate supervision

Kate Marshall (co-supervised with Ian Moss)

Marios Bounakis (co-supervised with Ian Moss)

Teaching

Semester 2:

PHY1029: Multivariate calculus and differential equations

 PHY8038: General Relativity



Publications

  • Prokopec T, Rigopoulos G. Functional Renormalization Group for Stochastic Inflation. Journal of Cosmology and Astroparticle Physics 2018, 2018(08), 13.
  • Moss IG, Rigopoulos G. Effective long wavelength scalar dynamics in de Sitter. Journal of Cosmology and Astroparticle Physics 2017, (05), 009.
  • Führer F, Rigopoulos G. Renormalizing a Viscous Fluid Model for Large Scale Structure Formation. Journal of Cosmology and Astroparticle Physics 2016, 2016, 032.
  • Rigopoulos G. Thermal Interpretation of Infrared Dynamics in de Sitter. Journal of Cosmology and Astroparticle Physics 2016, 2016(07), 035.
  • Garbrecht B, Gautier F, Rigopoulos G, Zhu Y. Feynman diagrams for stochastic inflation and quantum field theory in de Sitter space. Physical Review D 2015, 91(6), 063520.
  • Rigopoulos G, Valkenburg W. On the accuracy of N-body simulations at very large scales. Monthly Notices of the Royal Astronomical Society 2015, 446(1), 677-682.
  • Rigopoulos G. The adhesion model as a field theory for cosmological clustering. Journal of Cosmology and Astroparticle Physics 2015, 01(2015), 014.
  • Rampf C, Rigopoulos G, Valkenburg W. A relativistic view on large scale N-body simulations. Classical and Quantum Gravity 2014, 31(23), 234004.
  • Garbrecht B, Rigopoulos G, Zhu Y. Infrared correlations in de Sitter space: Field theoretic versus stochastic approach. Physical Review D 2014, 89, 063506.
  • Rigopoulos G. Fluctuation-dissipation and equilibrium for scalar fields in de Sitter. 2013.
  • Rampf C, Rigopoulos G. Initial conditions for cold dark matter particles and General Relativity. Physical Review D 2013, 87(12), 123525.
  • Rampf C, Rigopoulos G. Zel'dovich approximation and General Relativity. Monthly Notices of the Royal Astronomical Society Letters 2013, 430(1), L54-L58.
  • Enqvist K, Hotchkiss S, Rigopoulos G. A gradient expansion for cosmological backreaction. Journal of Cosmology and Astroparticle Physics 2012, 03, 026.
  • Rigopoulos G, Valkenburg W. A non-linear approximation for perturbations in LCDM. Physical Review D 2012, 86, 043523.
  • Enqvist K, Figueroa DG, Rigopoulos G. Fluctuations along supersymmetric flat directions during Inflation. Journal of Cosmology and Astroparticle Physics 2012, 01(2012), 053.
  • Enqvist K, Koivisto T, Rigopoulos G. Non-metric chaotic inflation. Journal of Cosmology and Astroparticle Physics 2012, 05(2012), 023.
  • Rigopoulos G. Gauge invariance and non-Gaussianity in Inflation. Physical Review D 2011, 84, 021301.
  • Enqvist K, Rigopoulos G. Non-linear mode coupling and the growth of perturbations in LCDM. Journal of Cosmology and Astroparticle Physics 2011, 03(2011), 005.
  • Garbrecht B, Rigopoulos G. Self Regulation of Infrared Correlations for Massless Scalar Fields during Inflation. Physical Review D 2011, 84, 063516.
  • Prokopec T, Rigopoulos G. Path Integral for Inflationary Perturbations. Physical Review D 2010, 82, 023529.
  • Enqvist K, Mattsson M, Rigopoulos G. Supernovae data and perturbative deviation from homogeneity. Journal of Cosmology and Astroparticle Physics 2009, 09(2009), 022.
  • Enqvist K, Nurmi S, Rigopoulos G, Taanila O, Takahashi T. The Subdominant Curvaton. Journal of Cosmology and Astroparticle Physics 2009, 11(2009), 003.
  • Enqvist K, Nurmi S, Podolsky D, Rigopoulos G. On the divergences of inflationary superhorizon perturbations. Journal of Cosmology and Astroparticle Physics 2008, 04(2008), 025.
  • Enqvist K, Nurmi S, Rigopoulos G. Parametric Decay of the Curvaton. Journal of Cosmology and Astroparticle Physics 2008, 10(2008), 013.
  • Koksma JF, Prokopec T, Rigopoulos G. The Scalar Field Kernel in Cosmological Spaces. Classical and Quantum Gravity 2008, 25, 125009.
  • Prokopec T, Rigopoulos G. Decoherence from Isocurvature Perturbations in Inflation. Journal of Cosmology and Astroparticle Physics 2007, 11(2007), 029.
  • Rigopoulos G, Shellard EPS, vanTent BJW. Quantitative bispectra from multifield inflation. Physical Review D 2007, 76, 083512.
  • Rigopoulos G, Shellard EPS, vanTent BJW. Non-linear perturbations in multiple-field inflation. Physical Review D 2006, 73, 083521.
  • Rigopoulos G, Shellard EPS, vanTent BJW. Large non-Gaussianity in multiple-field inflation. Physical Review D 2005, 73, 083522.
  • Rigopoulos G, Shellard EPS. Non-linear inflationary perturbations. Journal of Cosmology and Astroparticle Physics 2005, 10(2005), 006.
  • Rigopoulos G, Shellard EPS, vanTent BJW. Simple route to non-Gaussianity in inflation. Physical Review D 2005, 72, 083507.
  • Rigopoulos G, Shellard EPS. Stochastic fluctuations in multi-field inflation. Journal of Physics, Conference Series 2005, 8, 145-149.
  • Rigopoulos G. On second-order superhorizon perturbations in multifield inflationary models. Classical and Quantum Gravity 2004, 21, 1737-1754.
  • Rigopoulos G, Shellard EPS. Separate universe approach and the evolution of nonlinear superhorizon cosmological perturbations. Physical Review D 2003, 68, 123518.