Dr Hooshyar Assadullahi
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.
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.
Teaching responsibilities
- Space Science and Applications of Physics
- Waves and Optics
- Solid State Physics and Detectors
- Coordination of year three Projects
Research outputs
2025
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, 30p., 073
Research output: Article
2024
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, 35p., 053
Research output: Article
2023
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, 7p., 49001
Research output: Article
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, 34p., 042
Research output: Article
2022
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, 32p., 067
Research output: Article
Revisiting small-scale fluctuations in α-attractor models of inflation
Iacconi, L., Assadullahi, H., Fasiello, M., Wands, D.
9 Jun 2022, In: Journal of Cosmology and Astroparticle Physics. 2022, 06, 71p., 007
Research output: Article
2021
Ultra-slow-roll inflation with quantum diffusion
Pattison, C. D., Vennin, V., Wands, D., Assadullahi, H.
30 Apr 2021, In: Journal of Cosmology and Astroparticle Physics. 2021, 04, p. 1-40, 40p., 080
Research output: Article
2020
Qualitative dynamics of interacting vacuum cosmologies
Kaeonikhom, C., Rangdee, P., Assadullahi, H., Gumjudpai, B., Schewtschenko, J. A., Wands, D.
7 Dec 2020, In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 102, 12, 16p., 123519
Research output: Article
Small-scale tests of inflation
Iacconi, L., Fasiello, M., Assadullahi, H., Wands, D.
3 Dec 2020, In: Journal of Cosmology and Astroparticle Physics. 2020, 12, 25p., 005
Research output: Article
Interferometer constraints on the inflationary field content
Iacconi, L., Fasiello, M., Assadullahi, H., Dimastrogiovanni, E., Wands, D.
13 Mar 2020, In: Journal of Cosmology and Astroparticle Physics. 2020, 03, 19p., 31
Research output: Article