Where is physics going? | Sabine Hossenfelder, Bjรธrn Ekeberg and Sam Henry
TLDRThe discussion revolves around the Standard Model's limitations in explaining phenomena like dark matter, dark energy, and gravity. Despite its predictive success, the Standard Model is acknowledged to be incomplete, with recent anomalies suggesting the presence of new physics. The panelists, including physicists and a philosopher of science, debate whether the current model is fatally flawed or if it's a natural progression of scientific inquiry to encounter such puzzles. They explore the possibility of a paradigm shift in physics and the implications of such a shift on our understanding of the universe.
Takeaways
- ๐ The Standard Model, developed in the 1970s, has been successful in predicting the existence of quarks and the Higgs boson but fails to explain gravity, dark energy, and dark matter.
- ๐ Despite extensive searches, no evidence for supersymmetry or other theories beyond the Standard Model has been found, leading to a sense of stagnation in particle physics.
- ๐ค The lack of direct evidence for dark matter and the reliance on indirect observations have led to various theoretical proposals for its nature, but no consensus.
- ๐ก The discovery of anomalies, such as the muon g-2 experiment, suggests the presence of new physics but does not yet pinpoint the exact nature of these new phenomena.
- ๐ง Theoretical physicists face challenges in developing models that make clear, testable predictions, as many current theories can accommodate a wide range of outcomes.
- ๐ The scientific community is divided on whether building larger particle accelerators is the best path forward for discovering new physics.
- ๐ Astrophysical observations, such as those related to dark matter and dark energy, can profoundly impact theoretical physics and lead to new paradigms.
- ๐ The progress in physics is often incremental, with small discoveries and refinements to existing theories rather than major paradigm shifts.
- ๐ค Increased dialogue between physicists and philosophers of science may help address fundamental questions and refine the scientific method in the field of fundamental physics.
- ๐ The implications of discovering new particles or forces can range from being specific to the scientific community to having broader cultural and societal impacts.
- ๐ The motivation for continued research in particle physics includes both the potential for incremental advances and the hope for unexpected, revolutionary findings.
Q & A
What is the standard model and why is it significant?
-The standard model is a theory in particle physics that describes three of the four known fundamental forces (็ต็ฃๅ, weak force, and strong force) and classifies all known elementary particles. It is significant because it has been remarkably successful in predicting the existence of particles, such as quarks and the Higgs boson, and explaining a wide range of phenomena. However, it does not account for gravity, dark energy, or dark matter, indicating that it is not a complete description of the universe.
What are the main limitations of the standard model?
-The standard model's main limitations include its inability to explain gravity, dark energy, and dark matter. It also does not account for the observed matter-antimatter asymmetry in the universe and lacks a complete understanding of neutrino properties, such as why only left-handed neutrinos are observed.
What is the muon g-2 experiment and why is it significant?
-The muon g-2 experiment measures the anomalous magnetic moment of the muon, which is a property related to its magnetic field. The experiment is significant because its results have shown a discrepancy with the standard model predictions, suggesting the possible existence of new particles or forces not included in the current model.
What is supersymmetry and why was it expected to be the next step forward in particle physics?
-Supersymmetry is a theoretical extension of the standard model that proposes a symmetry between fermions (matter particles) and bosons (force particles). It was expected to be the next step forward in particle physics because it could potentially solve several issues in the standard model, such as providing candidates for dark matter and resolving the hierarchy problem. However, despite extensive searches, supersymmetry particles have not been observed in experiments like the Large Hadron Collider.
What is the current status of dark matter research?
-Dark matter research is ongoing, with multiple experiments attempting to directly detect dark matter particles or observe their indirect effects through gravitational influences. Despite extensive searches, dark matter particles have not been directly detected, and the nature and existence of dark matter remain some of the biggest mysteries in modern physics.
What is the role of theoretical physics in the advancement of particle physics?
-Theoretical physics plays a crucial role in guiding experimental physics by predicting new particles, forces, and phenomena based on mathematical models and symmetries. Theories like supersymmetry and modifications to the standard model have motivated the design of experiments and the interpretation of their results. However, the lack of experimental confirmation for many theoretical predictions has led to discussions about the effectiveness of current theoretical methods and the need for potential paradigm shifts.
What is the philosophical perspective on the development of scientific theories?
-The philosophical perspective emphasizes the importance of foundational questions and the evolution of scientific methods. It suggests that the current paradigm may be lacking in its ability to explain phenomena and that there may be a need to reevaluate the assumptions and methods used in theory development. Philosophers of science also highlight the historical context of scientific progress and the potential implications of paradigm shifts on our understanding of the universe.
What are the implications of a paradigm shift in physics?
-A paradigm shift in physics could have profound implications for our understanding of the universe. It could lead to new theories that better explain phenomena like dark matter and dark energy, or it could challenge fundamental concepts like the nature of gravity and the origin of the universe. Such shifts could also impact the broader cultural and philosophical discourse about our place in the cosmos.
Why is it challenging to find evidence for new physics beyond the standard model?
-Finding evidence for new physics is challenging because the predictions of alternative theories often rely on untested assumptions and complex calculations. Additionally, the energy scales required to produce new particles or effects may be beyond the reach of current experimental facilities. The indirect nature of evidence, such as the case with dark matter, further complicates the search and confirmation of new physics.
What are the potential future directions for particle physics research?
-Future directions for particle physics research could include building larger and more powerful colliders to probe higher energy scales, developing more precise measurements of known particles, exploring alternative theories like modified Newtonian dynamics (MOND) for dark matter, or investigating other phenomena such as ultra-high-energy cosmic rays and neutrinos.
Outlines
๐ Introduction to the Standard Model and Its Challenges
The discussion begins with Philip Ball introducing the topic of whether the standard model, which has been the foundation of our understanding of the universe since the 1970s, needs revision. Despite its success in predicting the existence of quarks, force particles, and the Higgs boson, the standard model fails to explain gravity, dark energy, and dark matter. Recent evidence suggests a new force that could potentially overturn the entire theory. The panel includes Sam Henry, a particle physicist; Sabina Hossenger, a theoretical physicist; and Bjorn Eckebech, a philosopher of science. They will explore the possibility of a paradigm shift in physics and the implications of the standard model's limitations.
๐ The Hunt for Supersymmetry and the Muon Anomaly
Sam Henry discusses the lack of discoveries beyond the standard model, such as supersymmetric particles and dark matter, despite expectations. He highlights the muon g-2 experiment, which found a discrepancy between the measured value of the muon's magnetic moment and the standard model prediction, potentially indicating new physics. However, Henry also notes that the lack of clear predictions from theories like supersymmetry has made it difficult to find evidence for new physics, and there's a need for more exciting developments in the field.
๐ค The Standard Model's Shortcomings and Quantum Gravity
Sabina Hossenger argues that calling the standard model 'flawed' is too harsh, as it works perfectly well within its domain. However, she acknowledges its shortcomings, such as the lack of a gravitational component and the mystery surrounding neutrinos, which come in only one handedness, unlike other particles. Hossenger suggests that the real paradigm shift might come from a better understanding of quantum mechanics and the measurement process, which are foundational to the standard model but not fully understood.
๐ Cosmology's Standard Model and the Path Dependence Problem
Bjorn Eckebech points out the existence of two standard models: one in particle physics and another in cosmology, based on the big bang theory and including dark matter and dark energy. He argues that the cosmological standard model appears deeply flawed, yet persists due to its entrenchment and the difficulty of developing an alternative. Eckebech suggests that physics, particularly cosmology, has become path dependent on the standard model, making it challenging to consider fundamental changes.
๐ง The Crisis in Physics and the Slowdown in Progress
The panelists discuss the perceived crisis in physics and the slowdown in progress, particularly in fundamental physics and particle physics. Sabina Hossenger explains that as scientific disciplines mature, progress becomes harder to achieve. She criticizes the theoretical physics community for not being careful enough in developing theories, leading to a disconnect between theory and experiment. Sam Henry adds that while progress hasn't stalled, it's not as rapid or as groundbreaking as hoped, and there's a need for reflection on the relationship between experimental and theoretical physics.
๐ The Impact of Astrophysical Observations on Theoretical Physics
The conversation turns to the impact of astrophysical observations, such as those related to dark energy, on theoretical physics. The panelists agree that these observations have introduced new problems for high-energy physicists, who were unprepared for the discovery of dark energy in the 1990s. The discussion highlights the challenge of reconciling theoretical predictions with observational data and the need for new theories to explain these discrepancies.
๐คฏ The Muon g-2 Anomaly and Theoretical Flexibility
The panelists delve into the muon g-2 anomaly, which suggests the presence of new physics beyond the standard model. Sam Henry explains the significance of the muon as a probe for new physics and the challenges in interpreting the g-2 results. Sabina Hossenger criticizes the theoretical community's ability to quickly provide explanations for anomalies, arguing that this flexibility renders predictions worthless. The discussion underscores the need for a more rigorous approach to theory development.
๐ก The Role of Philosophy of Science in Guiding Physics
Bjorn Eckebech discusses the role of the philosophy of science in addressing fundamental questions in physics and cosmology. He highlights the importance of questioning core assumptions and the limitations of current theoretical frameworks. Sabina Hossenger agrees, emphasizing the need for more critical examination of theory development methods. The panelists consider the value of philosophical insights in guiding the direction of future research and the potential for paradigm shifts in physics.
๐ The Dark Matter Problem and Alternative Approaches
The discussion focuses on the dark matter problem, with Sabina Hossenger explaining the indirect evidence for its existence and the challenges in detecting it. She criticizes the theoretical motivations behind dark matter candidates like WIMPs and axions, arguing that they are based on theoretical convenience rather than empirical evidence. The panelists consider alternative theories like Modified Newtonian Dynamics (MOND) and the need for more fundamental questions in physics.
๐ The Implications of a Paradigm Shift in Physics
Bjorn Eckebech discusses the potential implications of a paradigm shift in physics, arguing that minor changes, like replacing one block in a Jenga tower, may not affect many lives outside the scientific community. However, more radical shifts, like a new understanding of fundamental forces or the universe's origin, could have significant cultural impacts. He notes that the power of a theory lies in its ability to explain phenomena, and modern physics has become less effective in this regard.
๐ฌ The Quest for Discovery and the Future of Particle Physics
Sam Henry shares his perspective on the quest for discovery in particle physics, acknowledging that while scientists hope for unexpected findings, they do not expect to fundamentally upend our understanding of the universe. He recalls the็ญๆ็ excitement around the OPERA experiment's neutrino anomaly and the potential for a similar paradigm shift in the future. Sabina Hossenger emphasizes the need for more critical reflection on scientific methods and theory development in fundamental physics.
๐ Closing Remarks and Thanks to the Panelists
The discussion concludes with a reflection on the importance of the conversation and the need for more physicists to engage in such discussions. Sabina Hossenger highlights the evolving nature of the scientific method and the importance of being more careful in theory development. The panelists agree that while new discoveries may not immediately impact daily life, they could have significant long-term consequences and contribute to a deeper understanding of the universe.
Mindmap
Keywords
๐กStandard Model
๐กDark Matter
๐กDark Energy
๐กHiggs Boson
๐กMuon g-2 Anomaly
๐กSupersymmetry
๐กTheoretical Physics
๐กPhilosophy of Science
๐กCosmology
๐กParadigm Shift
Highlights
Discussion on the need for a change in our fundamental understanding of the universe since the 1970s.
The Standard Model's inability to explain gravity, dark energy, dark matter, and the quest for supersymmetry and a theory of everything.
Evidence of a new force challenging the Standard Model.
Sam Henry's perspective on the lack of new discoveries beyond the Higgs boson and the excitement for a paradigm shift in particle physics.
Sabina Hossenger's view that the Standard Model is not flawed but too good, and its shortcomings like dark matter and neutrinos.
Bjorn Eckeberg's argument on the path dependence of science and the difficulty in reconsidering entrenched scientific models.
The muon g-2 experiment's result not matching the Standard Model prediction, possibly indicating new physics.
Theoretical physics' struggle with making clear predictions and the challenge of finding new particles.
The disconnect between theory and experiments in particle physics and the long-term commitment to theoretical positions.
The role ofๅฒๅญฆๅฎถ in science and the limits of scientific knowledge.
The impact of astrophysical observations on fundamental physics, such as the discovery of dark energy.
The challenges of detecting dark matter due to its indirect evidence and lack of specific properties.
Theoretical physicists' need for self-reflection and updating methods of theory development.
The potential cultural impact of a paradigm shift in our understanding of the universe.
The excitement and media attention around the possibility of neutrinos traveling faster than light during the OPA experiment.
The importance of being more careful in theory development and questioning assumptions in fundamental physics.
The potential for a paradigm shift in physics and its implications for society.
Transcripts
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