About Me

I'm a data scientist based in Stockholm, Sweden. In my spare time I watch movies, read a lot, write a little, and enjoy the small things in life, be it an afternoon stroll or a simple home-made meal.

Data Science

I build customized machine learning solutions for international businesses. Some examples are:

- Identifying new consumer markets using unsupervised clustering, which helps business growth in untapped areas.

- Time-series forecast based on early indicators using various linear and nonlinear regression models. This enables the clients to assess the impact of their business actions at an earlier stage than otherwise possible.

- Channel attribution and budget recommendation via the media-mix modeling (MMM) approach, which provides directional indications of the marketing efficiency of different channels/platforms.

- Measuring incrementality from custom designed geo experiments, which uses Bayesian regression as the synthetic control method. This provides a rigorous readout on the impact of marketing efforts.

In one way or another, these problems are addressed via an optimization process:

\[ \begin{equation} \hat y_{\rm opt}^{\mathcal{D}}(x) = \underset{\hat y^{\mathcal{D}}}{\rm argmin}\frac{1}{M}\sum_l L(\hat y(x_l), y_l),\quad\mathcal{D}=\{(x_i,y_i)\}_{i=1}^M. \end{equation} \]

Physics

I'm broadly interested in gravitational waves (GWs) and cosmology. My PhD specialized in GWs produced by primordial magnetic fields in the early universe, specifically during the reheating era and later at the cosmological phase transitions in the radiation era. As GWs are usually the only observable from the very early universe that survive until the present day, they provide valuable insight into the turbulent physics at the very early times that would be otherwise inaccessible to us.

Another aspect I explored was the phenomenology of gravity theories alternative to general relativity (GR). As full theories, modified gravity presents a vast and complex space of possibilities. But at the level of GWs, as a result of linearization, only a handful of additional parameters enter and modify the standard GW equation in GR. Therefore, GW spectrum also serves as a phenomenological window into the parameter space of modified gravity.

The following manuscripts explore different parts of this action:

\[ \begin{align} S &= \int {\rm d}^4x\,\sqrt{-g}\,\Bigg[ \frac{1}{2\kappa}\left(\mathcal{L}_{\rm mat} + R + \frac{1}{4}m_{\rm g}^2\left(h_{\mu\nu}h^{\mu\nu} - \frac{1}{2}h^2\right) + \sum_{i=2}^5\mathcal{L}_i\right) \nonumber\\ &\quad -\left(\frac{1}{4}F_{\mu\nu}F^{\mu\nu} - A_\mu J^\mu\right) + \frac{\alpha_{\rm EM}^2}{90m_{\rm e}^4} \left((F_{\mu\nu}F^{\mu\nu})^2 + \frac{7}{4}(\tilde F_{\mu\nu}F^{\mu\nu})^2\right) \Bigg]. \end{align} \]

10. Cosmological gravitational waves and their interaction with large-scale magnetic fields (PhD thesis, Sigrid Arrhenius Award 2024)

9. Inverse Gertsenshtein effect as a probe of high-frequency gravitational waves ( IOP celebratory collection for Sweden 2024)

8. Modified propagation of gravitational waves from the early radiation era

7. Modified gravity approaches to the cosmological constant problem

6. Gravitational waves from primordial magnetic sources (Licentiate thesis)

5. Leading-order nonlinear gravitational waves from reheating magnetogeneses

4. Simulations of Helical Inflationary Magnetogenesis and Gravitational Waves

3. Tensor spectrum of turbulence-sourced gravitational waves as a constraint on graviton mass

2. Can we observe the QCD phase transition-generated gravitational waves through pulsar timing arrays?

1. Relic Gravitational Waves from the Chiral Magnetic Effect

Travel

Among the diverse countries on this tiny space rock, I'm lucky enough to have lived in four and visited a bunch more.

Movies

Fascinated by the wonderful story-telling of movies since childhood.

Books

A constant uphill battle against the never ending to-read list.

Art

A small collection of cyberpunky/fantasy spinoffs based on our own world.

Photo 1 Photo 2 Photo 3 Photo 4 Photo 5 Photo 6