VISMAYA: History & Philosophy of Physics

Author: G V Pavan Kumar

  • Conversation with Vijaykumar Krishnamurthy

    Vijaykumar Krishnamurthy is a faculty member at ICTS-TIFR, Bengaluru, working at the interface of physics and biology, with a focus on mechanochemical pattern formation in development. He is also the co-creator of Kaapi with Kuriosity, an outreach initiative that fosters public engagement with science through conversations and community events.

    In this episode, we explore “physics of life” and his life in physics.

    References:

    “Vijaykumar Krishnamurthy | ICTS.” n.d. Accessed May 31, 2025. https://www.icts.res.in/people/vijay-krishnamurthy.

    International Centre for Theoretical Sciences, dir. 2020. Physics of Life by Vijaykumar Krishnamurthy. https://www.youtube.com/watch?v=_ZtWiyZZafM.

    “(1) Vijay Krishnamurthy (@Vijay_K_Murthy) / X.” 2025. X (Formerly Twitter). May 22, 2025. https://x.com/vijay_k_murthy.

    Sansad TV, dir. 2016. Eureka with C V Vishveshwara. https://www.youtube.com/watch?v=gw9BQvkafSA.

    “Resonance Journal of Science Education | Indian Academy of Sciences.” n.d. Accessed May 31, 2025. https://www.ias.ac.in/describe/article/reso/008/10/0069-0075.

    “Kaapi with Kuriosity | ICTS.” n.d. Accessed May 31, 2025. https://www.icts.res.in/outreach/kaapi-with-kuriosity.

    “Biological PhysicsPhysics of Living Systems A Decadal Survey | National Academies.” n.d. Accessed May 31, 2025. https://www.nationalacademies.org/our-work/biological-physicsphysics-of-living-systems-a-decadal-survey.

    “The National Academies Press | Physics of Life.” n.d. Accessed May 31, 2025. https://nap.nationalacademies.org/resource/26403/interactive/.

    “Biological Physics Comes of Age.” n.d. Accessed May 31, 2025. https://www.aps.org/apsnews/2023/03/biological-physics.

  • 15 years at IISER Pune – Journey so far

    Today, I complete 15 years as a faculty member at IISER-Pune. I have attempted to put together a list of some lessons (based on my previous writings) that I have learnt so far. A disclaimer to note is that this list is by no means a comprehensive one, but a text of self-reflection from my viewpoint on Indian academia. Of course, I write this in my personal capacity. So here it is..

    1. People First, Infrastructure Next
      As an experimental physicist, people and infrastructure in the workplace are of paramount importance. When I am forced to prioritize between them, I have chosen people over infrastructure. I am extremely fortunate to have worked with, and continue to work with, excellent students, faculty colleagues, and administrative staff members. A good workplace is mainly defined by the people who occupy it. I do not neglect the role of infrastructure in academia, especially in a country like India, but people have a greater impact on academic life.
    2. Create Internal Standards
      In academia, there will always be evaluations and judgments on research, teaching, and beyond. Every academic ecosystem has its own standards, but they are generalized and not tailored to individuals. It was important for me to define what good work meant for myself. As long as internal standards are high and consistently met, external evaluation becomes secondary. This mindset frees the mind and allows for growth, without unnecessary comparisons.
    3. Compare with Yourself, Not Others
      The biggest stress in academic life often arises from comparison with peers. I’ve found peace and motivation in comparing my past with my present. Set internal benchmarks. Be skeptical of external metrics. Strive for a positive difference over time.
    4. Constancy and Moderation
      Intellectual work thrives not on intensity alone, but on constancy. Most research outcomes evolve over months and years. Constant effort with moderation keeps motivation high and the work enjoyable. Binge-working is tempting, but rarely effective for sustained intellectual output.
    5. Long-Term Work
      We often overestimate what we can do in a day or a week, and underestimate what we can do in a year. Sustained thought and work over time can build intellectual and technical monuments. Constancy is underrated.
    6. Self-Mentoring
      Much of the academic advice available is tailored for Western systems. Some of it is transferable to Indian contexts, but much of it is not. In such situations, I find it useful to mentor myself by learning from the lives and work of people who have done extraordinary science in India. I have been deeply inspired by many people, including M. Visvesvaraya, Ashoke Sen, R. Srinivasan, and Gagandeep Kang.
    7. Write Regularly—Writing Is Thinking
      Writing is a tool to think. Not just formal academic writing, but any articulation of thought, journals, blogs, drafts, clarifies and sharpens the mind. Many of my ideas have taken shape only after I started writing about them. Writing is part of the research process, not just a means of communicating its outcomes.
    8. Publication is an outcome, not a goal Publication is just one outcome of doing research. The act of doing the work itself is very important. It’s where the real intellectual engagement happens. Focus on the process, not just the destination.
    9. Importance of History and Philosophy of Physics
      Ever since my undergraduate days, I have been interested in the history and philosophy of science, especially physics. Although I never took a formal course, over time I have developed a deep appreciation for how historical and philosophical perspectives shape scientific understanding. They have helped me answer the fundamental question, “Why do I do what I do?” Reflecting on the evolution of ideas in physics—how they emerged, changed, and endured—has profoundly influenced both my teaching and research.
    10. Value of Curiosity-Driven Side Projects
      Some of the most fulfilling work I’ve done has emerged from side projects, not directly tied to funding deadlines or publication pressure, but driven by sheer curiosity. These projects, often small and exploratory, have helped me learn new tools, ask new questions, and sometimes even open up new directions in research. Curiosity, when protected from utilitarian pressures, can be deeply transformative.
    11. Professor as a Post-doc
      A strategy I found useful is to treat myself as a post-doc in my own lab. In India, retaining long-term post-docs is difficult. Hence, many hands-on skills and subtle knowledge are hard to transfer. During the lockdown, I was the only person in the lab for six months, doing experiments, rebuilding setups, and regaining technical depth. That experience was invaluable.
    12. Teaching as a Social Responsibility
      Scientific social responsibility is a buzzword, but for me, it finds its most meaningful expression in teaching. The impact of good teaching is often immeasurable and long-term. Watching students grow is among the most rewarding experiences in academia. Local, visible change matters.
    13. Teaching Informally Matters
      Teaching need not always be formal. Informal teaching, through conversations, mentoring, and public outreach, can be more effective and memorable. It is free of rigid expectations and evaluations. If possible, teach. And teach with joy. As Feynman showed us, it is a great way to learn.
    14. Foster Open Criticism
      In my group, anyone is free to critique my ideas, with reason. This open culture has been liberating and has helped me learn. It builds mutual respect and a more democratic intellectual space.
    15. Share Your Knowledge
      If possible, teach. Sharing knowledge is a fundamental part of academic life and enriches both the teacher and the learner. The joy of passing on what you know is priceless.
    16. Social Media: Effective If Used Properly
      Social media, if used responsibly, is a powerful tool, especially in India. It can bridge linguistic and geographical divides, connect scientists across the world, and communicate science to diverse audiences. For Indian scientists, it is a vital instrument of outreach and dialogue. My motivation to start the podcast was in this dialogue and self-reflection.
    17. Emphasis on Mental and Physical Health
      In my group, our foundational principle is clear: good health first, good work next. Mental and physical well-being are not optional; they are necessary conditions for a sustainable, meaningful academic life. There is no glory in research achieved at the cost of one’s health.
    18. Science, Sports, and Arts: A Trinity
      I enjoy outdoor sports like running, swimming, and cricket. Equally, I love music, poetry, and art from all cultures. This trinity of pursuits—science, sports, and the arts—makes us better human beings and enriches our intellectual and emotional lives. They complement and nourish each other.
    19. Build Compassion into Science
      None of this matters if the journey doesn’t make you a better human being. Be kind to students, collaborators, peers, and especially yourself. Scientific research, when done well, elevates both the individual and the collective. It has motivated me to humanize science.
    20. Academia Can Feed the Stomach, Brain, and Heart
      Academia, in its best form, can feed your stomach, brain and heart. Nurturing and enabling all three is the overarching goal of academics. And perhaps the goal of humanity.

    My academic journey so far has given me plenty of reasons to love physics, India and humanity. Hopefully, it has made me a better human being.

  • Einstein – Science and its History & Philosophy

    I have been interested in the views of Einstein related to the history and philosophy of science (HPS). The more I read about his work, the more I find that his inclination is to combine science with its historical and philosophical evolution. I am in search of his correspondence with fellow scientists and intellectuals, and have been looking at clues towards this combinational approach to science.

    The above image is the title of the Physics Today article.

    Recently, I came across an article in Physics Today1 that reproduced a part of Einstein’s letter2. Here it is:

    I fully agree with you about the significance and educational value of methodology as well as history and philosophy of science. So many people today—and even professional scientists—seem to me like someone who has seen thousands of trees but has never seen a forest. A knowledge of the historic and philosophical background gives that kind of independence from prejudices of his generation from which most scientists are suffering. This independence created by philosophical insight is—in my opinion—the mark of distinction between a mere artisan or specialist and a real seeker after truth

    It is clear that Einstein liked this combination and thought that it should be part of one’s scientific education. There is a lot more on this topic in the Physics Today article, and it is an excellent read to understand the thoughts of Einstein on this topic. More on this in a future blog…

    1. Howard, Don A. “Albert Einstein as a Philosopher of Science.” Physics Today 58, no. 12 (December 1, 2005): 34–40. https://doi.org/10.1063/1.2169442. ↩︎
    2. A. Einstein to R. A. Thornton, unpublished letter dated 7 December 1944
       (EA 6-574), Einstein Archive, Hebrew University, Jerusalem ↩︎

  • Soft Matter – emergence of a physics domain

    Recently, I read a nice interview with Sid Nagel, who is a pioneer in soft condensed matter physics.

    Sid Nagel has given an aura to an area of physics that was not considered fashionable even as late as the 2010s. Part of his elevation is because “Soft Matter Physics” has become so vital to understand our everyday world (including biological) that it is hard to ignore it anymore. Chemical Engineers, too, have played a major role in this elevation, and the James Frank Institute at Chicago has been an epicenter for this way of thinking.

    A major shift in thinking, especially among physicists, is thanks to PW Anderson. His essay – ‘More is Different” did a great service to soft matter and complex systems by highlighting the importance of emergence (side note: the word emergence does not occur in his essay, even once !) It further got a major headway with a Nobel to de Gennes. Suddenly, condensed matter physicists had something to explore beyond electrons and their density functions. The French school had a major hand in this.

    For me, soft matter physics, in a way, makes physics experiments democratic. One can still dare to do some ‘breakthrough science’ in a tiny kitchen 🙂

  • Conversation with Bejoy Thomas

    Bejoy Thomas is an Associate Professor in the Humanities & Social Sciences Department at IISER Pune: https://sites.google.com/view/bejoykt/home.

    He specializes in integrated water management with a river basin perspective. His research focuses on adaptation, access, and use of water in agricultural and domestic sectors, often collaborating across disciplines. With extensive fieldwork in Southern India, he has led multidisciplinary projects on water resources management and adaptation. His work bridges environmental sustainability, development, and policy.

    In this episode, we discuss his intellectual journey so far.

    1. “(“Bejoy K Thomas.” n.d. Accessed May 12, 2025. https://sites.google.com/view/bejoykt/home.
    2. “Bejoy K. Thomas.” n.d. Accessed May 12, 2025. https://www.atree.org/profile/bejoy-k-thomas/.
    3. “‪Bejoy K Thomas – ‪Google Scholar.” n.d. Accessed May 12, 2025. https://scholar.google.co.in/citations?user=G4DHDVoAAAAJ&hl=en.
    4. “Bejoy K. Thomas – IISER Pune.” n.d. Accessed May 12, 2025. https://www.iiserpune.ac.in/research/department/humanities-and-social-sciences/people/faculty/regular-faculty/bejoy-k-thomas/3463)
    5. Bejoy K Thomas, PhD | LinkedIn.” n.d. Accessed May 12, 2025. https://www.linkedin.com/in/bejoy-k-thomas/?originalSubdomain=in.
    6. Bejoy K Thomas (ബിജോയ്) [@bejoykt]. 2024. “Traveling through Kuttanad/Vembanad Wetland, Where I Did My PhD Fieldwork Almost Two Decades Ago. Two and a Half Hours Boat Ride on Kerala State Water Transport Department (SWTD) from Alappuzha to Kottayam Costs Only 29 Rupees. Https://T.Co/nxCUVPMgfj.” Tweet. Twitter. https://x.com/bejoykt/status/1869608390504468810.
    7. ———. 2025. “Https://T.Co/K8dsgAg5CK.” Tweet. Twitter. https://x.com/bejoykt/status/1902889113889718291.
    8. “Bejoy K Thomas (ബിജോയ്) (@bejoykt) / X.” 2025. X (Formerly Twitter). April 17, 2025. https://x.com/bejoykt.
    9. “Centre for Water Research – Research Centres and Initiatives – Research – IISER Pune.” n.d. Accessed May 12, 2025. https://www.iiserpune.ac.in/research/research-centres-and-collaborations/centre-for-water-research.
    10. Ray, Bejoy K. Thomas & Devesh Kumar. 2025. “Jal Jeevan Mission: Hits and Misses.” BusinessLine. March 20, 2025. https://www.thehindubusinessline.com/opinion/jal-jeevan-mission-hits-and-misses/article69354503.ece.
    11. SANDRP. 2025. “Infrastructure Projects in Chenab Basin and Climate Change: Need to Exercise Caution.” SANDRP (blog). April 27, 2025. https://sandrp.in/2025/04/27/infrastructure-projects-in-chenab-basin-and-climate-change-need-to-exercise-caution/.
    12. Tiwari, Bidisha SahaSubham. 2025. “How Many Dams India Needs to Deprive Pakistan of Indus Waters.” India Today. April 29, 2025. https://www.indiatoday.in/india/story/indus-waters-treaty-suspended-storage-dams-india-pakistan-jhelum-chenab-2716996-2025-04-29.
    13. “Why NEP 2020 Provides an Opportunity to Include Water in Higher Education Curricula | The Indian Express.” n.d. Accessed May 12, 2025. https://indianexpress.com/article/opinion/columns/nep-2020-include-water-higher-education-curricula-8612914/.

  • Einstein & experimental physics

    This is an excerpt from a paper on arxiv that I recently found.

    Also published in Europhysics News, 2024, 55 (4), pp.28-31

  • He made physics more humane…

    Today is Feynman’s birthday.

    Part of my becoming a physicist is because of his books on lectures on physics.

    Even today, as a professor of physics, and importantly as a student of physics, I go back to his lecture series to learn AND derive inspiration from his thinking. He made physics more humane.

    Many people across the globe have fallen in love with physics because of his books and the ‘way he did physics’

    Feynman was a physics genius, but he had his flaws. It is important for us to note the limitations of human beings; celebrate what is good, and be aware and critical of what is not.

    There is a lesson in every human life.

    It is up to us to learn from it.

  • Optothermally induced active & chiral motion – a new paper

    We have a new paper in Soft Matter

    link to the paper (free to access, thanks to IISER Pune library)

    We use optical illumination to generate thermal fields, creating non-reciprocal interactions between passive and active colloids. Active colloids absorb light and produce thermal gradients, driving thermo-osmotic forces that induce propulsion and chiral motion. Our Langevin simulations, backed by experimental observation, reveal how to control colloidal behavior. May have implications in light-driven chiral motion and nonlinear dynamics.

    Super effort by Rahul, Ashutosh & Sneha from our group, who combined numerical simulations, analytical theory, with experimental observations.

    The 2 anonymous reviewers made us think and work hard, and we thank them!

    Also, the paper is part of the journal’s themed collection on “Colloidal interactions, dynamics and rheology”

  • From Yukawa Archives: a draft, a letter & a rejection

    I have been amazed to explore the archives on Hideki Yukawa, which have been systematically categorized and meticulously maintained by Osaka University in Japan. My sincere thanks and acknowledgment to the Yukawa Memorial.

    Below are a few gems from their public archives :

    1. Draft of the paper written in 1934 – The making of the groundbreaking paper of Yukawa, which eventually led to his Nobel Prize in 1949.

    The archive draft is accompanied by a note which reads:

    Yukawa had not published any paper before then. In 1933, Yukawa began working at Osaka Imperial University and tackled the challenge of elucidating the mystery of nuclear forces while Seishi Kikuchi and other prominent researchers were producing achievements in nuclear physics and quantum physics. The idea of γ’ (gamma prime) that Yukawa came up with in early October led to the discovery of a new particle (meson) that mediates nuclear forces. The idea of introducing a new particle for the purpose of explaining the forces that act between particles was revolutionary at that time. Yukawa estimated the mass of the new particle and the degree of its force. No other physicists in the world had thought of this idea before.

    2. Letters between Tomonaga and Yukawa

    Sin-Itiro Tomonaga was a legendary theoretical physicist from Japan, who independently formulated the theory of quantum electrodynamics (apart from Feynman and Schwinger) and went on to win the Nobel Prize in physics in 1965.

    Tomonaga was a friend and classmate of Yukawa, and they inspired each other’s work. Below is a snapshot of the letter from 1933 written in Japanese.

    Both these theoreticians were intensely working on interrelated problems and constantly exchanged ideas. The archival note related to the letter has to say the following:

    During this period, Yukawa and Tomonaga concentrated on elucidating nuclear forces day in and day out, and communicated their thoughts to each other. In this letter, before starting the explanation, Tomonaga wrote “I am presently working on calculations and I believe that the ongoing process is not very interesting, so I omit details.” While analyzing the Heisenberg theory of interactions between neutrons and protons, Tomonaga attempted to explain the mass defects of deuterium by using the hypothesis that is now known as Yukawa potential. The determination of potential was arbitrary and the latest Pegrum’s experiment at that time was taken into consideration. Tomonaga also compared his results with Wigner’s theorem and Majorana’s theory.

    3. Rejection letter from Physical Review

    Which physicist can escape a rejection from the journal Physical Review?

    Even Yukawa was not spared :-) Below is a snapshot of a rejection letter from 1936, and John Tate does the honours.

    The influence of Yukawa and Tomonaga can be seen and felt at many of the physics departments across Japan. Specifically, their influence on nuclear and particle physics is deep and wide, and has inspired many in Japan to do physics. As the archive note says:

    Yukawa and Tomonaga fostered the theory of elementary particles in Japan from each other’s standpoint. Younger researchers who were brought up by them, so to speak, must not forget that the establishment of Japan’s rich foundation for the research of the theory of elementary particles owes largely to Yukawa and Tomonaga.

    4. Lastly, below is a picture of the legends from the archive: Enrico Fermi, Emilio Segrè, Hideki Yukawa, and James Chadwick.

    From the archive note on the picture from September 1948:

    Yukawa met Prof. Fermi and other physicists of the University of Chicago who were staying in Berkeley for the summer lectures. From the left: Enrico Fermi, Emilio Segrè, Hideki Yukawa, and James Chadwick.

    Tomorrow, I will conclude my third trip to Japan. I always take a lot of inspiration from this wonderful country. As usual, I have not only met and learnt a lot from contemporary Japanese researchers, but also have metaphorically visited the past masters who continue to inspire physicists like me across the world.

    For this, I have to say: Dōmo arigatōgozaimasu !