Fundamental Cosmology & Dark Energy

Publications

Talks:

• The cosmic dipole anomaly (A multipolar universe?, 4-7 Sep 2023, Thessaloniki)
• Is the Universe isotropic? (A.K. Raychaudhuri Centenary Symposium, 11-12 Aug 2023, Kolkata)
• A challenge to the standard cosmological model (Humboldt-Universität Physics Colloquium, 16 Jul 2024, Berlin; Zurich Physics Colloquium (video), 15 November 2023, Zurich; Frontiers in Cosmology, 22 Feb 2023, Bangalore; TIFR Colloquium (video), 8 Feb 2023, Mumbai; Annual Theory Meeting, 14 Dec 2022, Durham; ‘FestKolloquium’: Werner Hofmann & Felix Aharonian, 8 Dec 2022, Heidelberg; Joint Cavendish-DAMTP Seminar, 4 Nov 2022, Cambridge; Nordita Astrophysics Seminar (video), 12 Oct 2022, on-line; Workshop on the Standard Model & Beyond, 1 Sep 2022, Corfu; XXIX Intern. Conf. on Supersymmetry & Unification of Fundamental Interactions (video), 27 Jun-2 Jul 2022, Ioannina; 24th Intern. Conf.: From the Planck Scale to the Electroweak Scale, 30 May-3 Jun 2022, Paris)
• Testing the Cosmological Principle (Joint Hawaii Physics & IfA colloquium (video), 21 Sep 2022, on-line; Challenges to ΛCDM, 5-7 Sep 2022, Thessaloniki; A Discussion on the Cosmological Principle, 25-28 Oct 2021, on-line; 38th Conference on Recent Developments in High Energy Physics & Cosmology (video), 16-19 Jun 2021, on-line; Cosmological Frontiers in Fundamental Physics: APC-Perimeter-Solvay 2021, 26 May 2021, on-line; SLAC EPP Theory Seminar, 14 May 2021, on-line; Demokritos Colloquium, 11 May 2021, on-line; Tehran Meeting on Cosmology at the Crossroads (video), 23 Feb 2021, on-line; Particle, Astroparticle & Cosmology Symposium, Tallinn, 18-22 Jul 2018)
  
• Falsifying the standard cosmological model (Majorana-Raychaudhuri Seminar, 26 Aug 2022, on-line)
• Reconstructing cosmology (XV Intern. Conf. on Interconnections between Particle Physics & Cosmology, 6-10 Jun 2022, St Louis)
  
• Re-examining cosmic acceleration (Sommerfeld Theory Colloquium (video), 20 Jan 2021, on-line; IFPU Colloquium (video), 18 Dec 2020, on-line)
• Beyond the cosmological standard model (International Symposium on Recent Developments in Relativistic Astrophysics, 11-13 Dec 2023, Gangtok; DESY Colloquium (video), 1 Dec 2020, on-line)
• Challenging the cosmological principle (Newton 1665 Seminar (video), 23 Oct 2020, on-line)
• Evidence for anisotropy of cosmic acceleration (IUCAA Colloquium (video), 28 May 2020, on-line; IPPP Colloquium, 30 Apr 2020; Cosmology Seminar 17 Dec 2019, Geneva)
• Cosmic acceleration revealed by Type la supernovae? (Saturday Morning of Theoretical Physics (video), 1 Nov 2019, Oxford)
• Beyond the standard cosmological model (Physikalisches Kolloquium, 27 Nov 2017, Heidelberg)
• Is there evidence for cosmic acceleration? (NIKHEF Landelijk Seminarium, 24 Mar 2017, Amsterdam)
• Cosmology beyond the standard model (Elizabeth Spreadbury Lecture (slides), 22 Mar 2017, London)
• Current problems in cosmology (APPEC Town Meeting, 6-7 Apr 2016, Paris)
• Does dark energy exist? (Cosmology, Strings, and Phenomenology, 11-20 Jun 2007, Stockholm)
• Do CMB & LSS data require dark energy? (Outstanding questions for the standard cosmological model, 26-20 Mar 2007, London)
• What have we learnt from WMAP: Dark matter vs dark energy (The Dark Side of the Universe, 20-24 Jun 2006, Madrid)
• Cosmology in wonderland (IOP Particle Physics (slides), 6-7 Apr 2004, Birmingham)

Reviews:

• Heart of darkness (Inference: International Journal of Science, 2022)
• Do supernovae indicate an accelerating universe? (European Journal of Physics: Special Topics, 2021)
• Is the evidence for dark energy secure? (Special issue of General Relativity & Gravitation, eds. G.F.R. Ellis et al, 2008)
• Does cosmological structure formation require dark energy? (Dark Energy & Dark Matter 2008, Lyon)
• Einstein's universe: The challenge of dark energy (The legacy of Albert Einstein, ed. S.R. Wadia, 2005)
• New results in cosmology (EPS-HEP 2001, Budapest)

Papers:

• Cosmological inference from within the peculiar local universe (2024)
• Galaxy number-count dipole and superhorizon fluctuations (2022)
• A challenge to the standard cosmological model (2022)
• A test of the cosmological principle with quasars (2021)
• Is there really a 'Hubble tension'? (2021)
• A response to Rubin & Heitlauf: "Is the expansion of the universe accelerating? All signs still point to yes" (2019)
• Evidence for anisotropy of cosmic acceleration (2019)
• The dipole anisotropy of AllWISE galaxies (2017)
• High redshift radio galaxies and divergence from the CMB dipole (2017)
• Marginal evidence for cosmic acceleration from Type Ia supernovae (2016)
• Frames of most uniform Hubble flow (2016)
• How rare is the Bullet Cluster (in a ΛCDM universe)? (2014)
• The integrated Sachs-Wolfe imprints of cosmic superstructures: a problem for ΛCDM (2012)
• Reconciling the local void with the CMB (2011)
• Probing the anisotropic local universe and beyond with SNe Ia data (2010)
• Constraints on large scale inhomogeneities from WMAP-5 and SDSS (2010)
• Multiple inflation and the WMAP 'glitches' II. Data analysis and cosmological parameter extraction (2007)
• Large-scale galaxy correlations as a test for dark energy (2005)
• An alternative to the cosmological 'concordance model' (2003)

Media coverage:

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