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tobiasgalla.bsky.social
Tobias Galla
@tobiasgalla.bsky.social
200 followers 190 following 26 posts
Theoretical physicist (statistical mechanics, complex systems), CSIC tenured scientist, IFISC Palma de Mallorca (@ifisc.uib-csic.es), reproductive success n=3 https://sites.google.com/view/tobiasgalla/
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · 2d
... provide an analysis of details of the implementation. We compare the accuracy & efficiency of both methods for different examples. Iterative algorithm is the better choice for problems with simple boundaries, Monte Carlo method better for problems with complex boundaries.
tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · 2d
Numerical methods for quasi-stationary distributions arxiv.org/abs/2510.02891

(with Sara Oliver-Bonafoux, @javi-aguilar.bsky.social , Raúl Toral).

We discuss an iterative method to obtain QSDs of stochastic processes with absorbing states, and a Monte Carlo scheme with resetting. We ...
Numerical methods for quasi-stationary distributions
In stochastic processes with absorbing states, the quasi-stationary distribution provides valuable insights into the long-term behaviour prior to absorption. In this work, we revisit two well-establis...
arxiv.org
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · 2d
Joke about efficient market hypothesis: "Eugene Fama and a friend are walking down a street, and see a $100 bill. Fama says: Must be fake, otherwise someone would have picked it up already."

(Seen in @doynefarmer.bsky.social's book "Making sense of chaos").
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Jul 21
www.iop.org/physics-comm...
Professor Alan John Bray (1948-2025)
Theoretical physicist who made important contributions to the theory of spin glasses and phase ordering.
www.iop.org
tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Jul 16
Review "Opinion dynamics: Statistical physics and beyond"
arxiv.org/abs/2507.11521

Lab experiments, data, models, analytical/computational tools. 93 pages, >1k references.

With Fabian Baumann, David Garcia, Gerardo Iñiguez, Márton Karsai, Jan Lorenz, Katarzyna Sznajd-Weron. Led by Michele Starnini
Opinion dynamics: Statistical physics and beyond
Opinion dynamics, the study of how individual beliefs and collective public opinion evolve, is a fertile domain for applying statistical physics to complex social phenomena. Like physical systems, soc...
arxiv.org
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Jun 25
<<< allows us to analytically calculate the power spectrum of oscillations. We explore when these approximations break down and provide recommendations for their use.
tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Jun 25
<<< We describe multiple levels of approximation (rate eps, piecewise-deterministic processes, SDEs), and show that the chemical Langevin equation can include a noise representing transcriptional bursting. This decreases computation times and >>>
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Jun 25
Efficient approximations of transcriptional bursting effects on the dynamics of a gene regulatory network

royalsocietypublishing.org/doi/10.1098/...

(with Jochen Kursawe, Antoine Moneyron)

Transcriptional bursting induces oscillations otherwise not present, or magnifies existing oscillations. >>>
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Jun 10
4 postdoc positions in complex systems at IFISC, Palma de Mallorca. Call open until 20/10/25, but positions will be filled starting immediately. If interested, please apply now. Candidates must be EU citizens.
ifisc.uib-csic.es
IFISC @ifisc.uib-csic.es · Jun 10
📢 IFISC (UIB-CSIC) in Mallorca is offering up to 4 postdoctoral positions in complex systems science!
🔍 Topics: social systems, unconventional computing, life & environment.

📅 Deadline: 20/10/2025
🔗 Details: ifisc.uib-csic.es/en/about-ifi...
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · May 28
Breaking co-existence: zealotry vs nonlinear social impact

(w Chris Kitching, Lucía Ramirez, @maxisanmiguel.bsky.social)

arxiv.org/abs/2505.21407

Zealotry breaks coexistence in voter models, partisan voter models, and evolutionary games. We show that sublinear social impact can prevent this.
Breaking co-existence: zealotry vs. nonlinear social impact
We study how zealotry and nonlinear social impact affect consensus formation in the nonlinear voter model, evolutionary games, and the partisan voter model. In all three models, consensus is an absorb...
arxiv.org
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Apr 21
181.71 million km, sorry
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Mar 13
“It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material.”

(Watson & Crick 1953)
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Mar 13
“[...] nonperiodic solutions are ordinarily unstable with respect to small modifications, so that slightly differing initial states can evolve into considerably different states."

"The feasibility of very-long-range weather prediction is examined in the light of these results.”

(Lorenz 1963)
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Mar 13
“It is worth noting that an essential feature of the type of theory which has been described in this note is the prediction of incomplete multiplets of scalar and vector bosons.”

(Higgs 1964)
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Mar 13
“In this paper, we present Google, a prototype of a large-scale search engine […].”

(Brin & Page 1998)
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Mar 13
“We wish to suggest a structure for the salt of deoxyribose nucleic acid (D.N.A.). This structure has novel features which are of considerable biological interest.”

(Watson & Crick 1953)
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Mar 13
"The small boys came early for the hanging", this is the opening line of @kenfollettauthor.bsky.social's Pillars of the Earth.

Does anyone have examples of exceptional opening lines of scientific papers (or any other memorable quotes)?

I give a few below. Other examples welcome.
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Mar 5
"Proliferating active disks with game dynamical interaction" (with A. Almodóvar, C. López)

arxiv.org/abs/2503.02555

Self-population enhances mixing in coexistence games, speeds up extinction in coordination games, and reduces the invasion probability of a beneficial mutant.
Proliferating active disks with game dynamical interaction
We study a system of self-propelled, proliferating finite-size disks with game-theoretical interactions, where growth rates depend on local population composition. We analyze how these interactions in...
arxiv.org
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Feb 25
Predictability of temporal network dynamics in normal ageing and brain pathology

(preprint with Lisa Caligiuri, Massimiliano Zanin, @wetuad.bsky.social, and others)

arxiv.org/abs/2502.16557
Predictability of temporal network dynamics in normal ageing and brain pathology
Spontaneous brain activity generically displays transient spatiotemporal coherent structures, which can selectively be affected in various neurological and psychiatric pathologies. Here we model the f...
arxiv.org
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Feb 21
<< how many opinions are present in the population. We also show that there is a transition between a phase which the system is mostly in consensus (low innovation rate), and another phase in which consensus is rare (high innovation rate). On networks, degree heterogeneity affects this balance.
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Feb 21
A voter model with an evolving number of opinion states
(with Jeehye Choi, Byungjoon Min)

arxiv.org/abs/2502.14696

We study a VM in which new opinion states can emerge in the dynamics. Adapting methods previously used in theoretical evolutionary biology we compute >>
Analysis of a voter model with an evolving number of opinion states
In traditional voter models, opinion dynamics are driven by interactions between individuals, where an individual adopts the opinion of a randomly chosen neighbor. However, these models often fail to ...
arxiv.org
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Feb 19
The joys of science. (This is one single resubmission, not the 11th time that we resubmit this manuscript).
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Reposted by Tobias Galla
omeuxeito.bsky.social
Saúl Ares @omeuxeito.bsky.social · Jan 19
Do mathematical paradoxes, like the Monty Hall problem, blow your mind? Well, they're for beginners... Today I discovered there's a paradox, that you can recreate yourself anytime, way crazier. Welcome to the Coin Rotation Paradox 🤯
youtu.be/FUHkTs-Ipfg?...
via @veritasium.bsky.social
The SAT Question Everyone Got Wrong
YouTube video by Veritasium
youtu.be
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Reposted by Tobias Galla
theobioarne.bsky.social
theobioarne.bsky.social @theobioarne.bsky.social · Jan 10
🚨 Annual IMPRS Call for Doctoral Positions at MPI-EvolBio 🚨
🎓 Fully-funded 3.5-year doctoral projects available in diverse research areas!
#PhD #ResearchOpportunities #IMPRS #Science evolbio.mpg.de/3801127/annu...
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tobiasgalla.bsky.social
Tobias Galla @tobiasgalla.bsky.social · Dec 23
<<< boundary of the action simplex: a fraction of the actions are played with vanishing probability.

We also calculate the critical exploration rate that guarantees convergence to a unique fixed point.

[To be published in AAAI (Association for the Advancement of Artificial Intelligence) 2025]