Mr Andrius Tamosiunas
Telephone: +44 (0)2392 845826Office: DS3.13
Research interests: models of modified gravity, testing gravity, machine learning in cosmology
I’m a 2nd year PhD student working on testing models of modified gravity with a broad range of interests in theories and cosmological tests of modified gravity as well as cosmological simulations and machine learning techniques in cosmology. Before this I have studied the phenomenology of various inflationary models (MPHys at the University of Edinburgh) and spent a few years working as a data scientist.
Here’s a snapshot of what I am currently working on:
1. Testing models of modified gravity with galaxy clusters using the newest DES data
This is a continuation of previous work as described in arXiv:1901.05505, which uses a combination of weak lensing and X-ray cluster data to put constraints on the model of Emergent Gravity. With the newest DES data being available we hope to extend this methodology to testing modified gravity in a model-blind way by using stacked galaxy cluster data to find deviations from GR.
2. Models of modified gravity in the context of the problem of dark matter on galaxy cluster scales
Recently, there has been a number of models tackling the problem of dark matter on galaxy cluster scales, including the model of Emergent Gravity, Covariant Emergent Gravity and the model of Superfluid Dark Matter. These models share some similarities in the mathematical structure, but offer different observable predictions, which could be tested using a combination of probes on cluster scales.
3. Cosmological simulations using deep learning
Recently various machine learning generative models (GAN’s, variational autoencoders and others) have been used as fast and accurate emulators of cosmological and astrophysical simulations. Our work aims to extend these algorithms towards becoming reliable and fast emulators capable of producing cosmic web and weak lensing convergence maps for various cosmologies and modified gravity models.Qualifications: MPhys in Physics
Publications from UKADS
Publications from INSPIRE
Publications from arXiv
Publications from the UoP Research Portal
External talks (academic)
External talks (outreach)