I'm a cosmologist who works on understanding the role of gravity in our universe. In particular, I develop tools to test ideas about modified gravity and dark energy models with gravitational waves, large-scale structure and cosmological voids.
I completed my PhD at the University of Oxford, on devising mathematical frameworks for testing alternatives to General Relativity. I remained in Oxford for a five-year postdoctoral research fellowship at All Souls College, one year of which I spent as Fulbright Visiting Scholar at the University of Pennsylvania. In January 2019 I moved to QMUL to join the Cosmology & Relativity group as a Royal Society University Research Fellow and proleptic senior lecturer.
You can check out my personal website via the link above.
Semester A 2020: Module Associate for SPA6311 Physical Cosmology.
In the past I've lectured in fourth-year courses on weak lensing and introductory cosmology for the MMathPhys degree at Oxford.
In 2020 I gave a lecture series `Cosmology Beyond General Relativity' at the SIGRAV Internationl PhD school, details can be found here.
My primary research interests at present are:
- Multimessenger gravitational wave events.
- Systems for describing cosmologically-motivated alternatives to GR ('parameterisations').
- Testing gravity with galaxy surveys (large-scale structure and weak lensing).
- Cosmological voids as unique laboratories in the universe.
I'm currently supported by two awards from the Royal Society, one of the UK's most long-standing independent scientific bodies:
Royal Society University Research Fellowship, 2019 - 2023.
Royal Society Research Fellow's Enhancement Award, 2019 - 2021.
From Feburary 2021, I will commence a Starting Grant from the European Research Council, under the Horizon2020 framework.
Some selected publications:
T. Baker and I. Harrison, ‘Constraining Scalar-Tensor Modified Gravity with Gravitational Waves and Large Scale Structure Surveys' (2020), https://arxiv.org/abs/2007.13791, submitted to JCAP.
A. Pisani, E. Massara, D. Spergel, D. Alonso, T. Baker et al., ‘Cosmic voids: a novel probe to shed light on our Universe’ (2019), https://arxiv.org/abs/1903.05161.
T. Baker, J. Clampitt, B. Jain, & M. Trodden, ‘Void Lensing as a Test of Gravity’, Phys. Rev. D 98, 023511 (2018), https://arxiv.org/abs/1803.07533.
M. Lagos, E. Bellini, J. Noller, P.G. Ferreira, T. Baker, ‘A general theory of linear cosmological perturbations: sta- bility conditions, the quasistatic limit and dynamics’, JCAP 03 (2018) 021, https://arxiv.org/abs/1711.09893.
T. Baker, E. Bellini, P. Ferreira, M. Lagos, J. Noller & I. Sawicki, ‘Strong constraints on cosmological gravity from GW170817 and GRB 170817A’, Phys. Rev. Lett. 119, 251301 (2017). Selected as a PRL Editor’s Highlight contribution. https://arxiv.org/abs/1710.06394
T. Baker, M. Trodden, ‘Multi-Messenger Time Delays from Lensed Gravitational Waves’, Phys. Rev. D., Vol. 95 063512 (2017), https://arxiv.org/abs/1612.02004.
M. Lagos, T. Baker, P.G. Ferreira, J. Noller, ‘A General Theory of Linear Cosmological Perturbations: scalar- tensor and vector-tensor theories’, Journal of Cosmology and Astroparticle Physics, Issue 08, article id. 007 (2016),https://arxiv.org/abs/1604.01396.
T. Baker, P. Bull, ‘Observational signatures of modified gravity on ultra-large scales’, The Astrophysical Journal, Vol. 811 No. 2 (2015), http://arxiv.org/abs/1506.00641
T. Baker, D. Psaltis, C. Skordis, ‘Linking Tests of Gravity On All Scales: from the Strong-Field Regime to Cosmology’, The Astrophysical Journal, 802 63 (2015), http://arxiv.org/abs/1412.3455
T. Baker, P.G. Ferreira, C. Skordis, ‘The Parameterized Post-Friedmann Framework for Theories of Modified Gravity: Concepts, Formalism and Examples’, Phys. Rev. D, Vol.87, 024015 (2013), http://arxiv.org/abs/1209.2117
T. Baker, P.G. Ferreira, C. Skordis, J. Zuntz, ‘Towards a Fully Consistent Parameterization of Modified Gravity’, Phys. Rev. D, Vol. 84, Issue 12 (2011), http://arxiv.org/abs/1107.0491
Current PhD students:
Ashim Sen Gupta
Winner of the ‘Women of the Future Award’, science category, 2015.
Fulbright All-Disciplines Scholar Award, 2015-2016.
SET for Britain Cavendish medal for Physics, 2014.