Personal profile
Biography
My overall area of interest is early universe cosmology, in particular aspects of non-linear cosmological perturbations related to observational cosmology.
Non-Gaussianity (deviations from an exact Gaussian distribution of the primordial density perturbation), gravitational waves (tensor perturbation) and primordial Black holes are three aspects of cosmological perturbation, which bridge between theoretical cosmology and observation.
Their possible detection would help us to identify physical processes at work in the early Universe models. Establishing the early universe model, will able us to give greater clarity to the late universe problems like dark energy.
Teaching Responsibilities
- Space Science and Applications of Physics
- Waves and Optics
- Solid State Physics and Detectors
- Coordination of year three Projects
Research Interests
My overall area of interest is early universe cosmology, in particular aspects of non-linear cosmological perturbations related to observational cosmology.
Non-Gaussianity (deviations from an exact Gaussian distribution of the
primordial density perturbation), gravitational waves (tensor perturbation) and primordial Black holes are three aspects of cosmological perturbation, which bridge between theoretical cosmology and observation.
Their possible detection would help us to identify physical
processes at work in the early Universe models. Establishing the early universe model, will able us to give greater clarity to the late universe problems like dark energy.
I am also intereste on models of early universe inflation such as Stocastic Inflation. In this model we try to have a beter understading of quantum mechanics effect, in early unioverse cosmology.
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Collaborations and top research areas from the last five years
Research output
- 25 Article
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Stochastic inflation beyond slow roll: noise modelling and importance sampling
Jackson, J. H. P., Assadullahi, H., Gow, A. D., Koyama, K., Vennin, V. & Wands, D., 24 Apr 2025, In: Journal of Cosmology and Astroparticle Physics. 2025, 04, 30 p., 073.Research output: Contribution to journal › Article › peer-review
Open AccessFile107 Downloads (Pure) -
The separate-universe approach and sudden transitions during inflation
Jackson, J. H. P., Assadullahi, H., Gow, A. D., Koyama, K., Vennin, V. & Wands, D., 9 May 2024, In: Journal of Cosmology and Astroparticle Physics. 2024, 5, 35 p., 053.Research output: Contribution to journal › Article › peer-review
Open AccessFile169 Downloads (Pure) -
Non-perturbative non-Gaussianity and primordial black holes
Gow, A. D., Assadullahi, H., Jackson, J. H. P., Koyama, K., Vennin, V. & Wands, D., 30 May 2023, In: Europhysics Letters. 142, 4, 7 p., 49001.Research output: Contribution to journal › Article › peer-review
Open AccessFile166 Downloads (Pure) -
Observational constraints on interacting vacuum energy with linear interactions
Kaeonikhom, C., Assadullahi, H., Schewtschenko, J. & Wands, D., 26 Jan 2023, In: Journal of Cosmology and Astroparticle Physics. 2023, 01, 34 p., 042.Research output: Contribution to journal › Article › peer-review
Open AccessFile137 Downloads (Pure) -
Numerical simulations of stochastic inflation using importance sampling
Jackson, J. H. P., Assadullahi, H., Koyama, K., Vennin, V. & Wands, D., 21 Oct 2022, In: Journal of Cosmology and Astroparticle Physics. 2022, 10, 32 p., 067.Research output: Contribution to journal › Article › peer-review
Open AccessFile80 Downloads (Pure)
Datasets
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Data availability statement for 'The attractive behaviour of ultra-slow-roll inflation'.
Pattison, C. (Creator), Vennin, V. (Creator), Assadullahi, H. (Creator) & Wands, D. (Creator), IOP Publishing, 31 Aug 2018
Dataset
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Data availability statement for 'Interferometer constraints on the inflationary field content'.
Iacconi, L. (Creator), Fasiello, M. (Creator), Assadullahi, H. (Creator), Dimastrogiovanni, E. (Creator) & Wands, D. (Creator), IOP Publishing, 13 Mar 2020
Dataset
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Data availability statement for 'Tunneling in stochastic inflation'.
Noorbala, M. (Creator), Vennin, V. (Creator), Assadullahi, H. (Creator), Firouzjahi, H. (Creator) & Wands, D. (Creator), IOP Publishing, 21 Sept 2018
Dataset
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Data availability statement for 'Non-Gaussianity from axion-gauge fields interactions during inflation'.
Dimastrogiovanni, E. (Creator), Fasiello, M. R. (Creator), Hardwick, R. (Creator), Assadullahi, H. (Creator), Koyama, K. (Creator) & Wands, D. (Creator), IOP Publishing, 19 Nov 2018
Dataset
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Data availability statement for 'Small-scale tests of inflation'.
Iacconi, L. (Creator), Fasiello, M. (Creator), Assadullahi, H. (Creator) & Wands, D. (Creator), IOP Publishing, 3 Dec 2020
Dataset
Projects
- 2 Finished
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Cosmology, Gravitation and Astrophysics at Portsmouth
Crittenden, R. (PI), Amara, A. (CoI), Assadullahi, H. (CoI), Bacon, D. (CoI), Graur, O. (CoI), Koyama, K. (CoI), Wands, D. (CoI) & Noller, J. (CoI)
1/04/22 → 31/03/25
Project: Research
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Development of flexible stress-free thin films using KJL magnetron plasma sputtering
Vopson, M. (PI), Naylor, D. J. C. (CoI) & Assadullahi, H. (CoI)
8/02/16 → 8/02/19
Project: Innovation