Mardi 1 Juillet 2025, 09:00 à IHP, Amphitheater "Yvonne Choquet-Bruhat", building Perrin, 2nd floor ( https://indico.global/event/14299/ )	WORK-CONF (Workshop or Conference)	gr-qc
Grampa 2025 At Institut Henri Poincaré	DAY 1
Abstract:	This is the second edition of the General Relativity from AMPlitudes Alliance (GRAMPA) workshop, whose primary goal is to support early-career researchers working in the field of scattering amplitudes applied to gravitational theories. The main theme of the workshop is to use of innovative techniques from the field of scattering amplitudes and beyond to study aspects of gravity relevant to upcoming gravitational wave experiments. There will be talks from GRAMPA members on aspects of their work in this field, as well as two short pedagogical lecture series by faculty researchers. The workshop will provide fertile ground for knowledge exchange between communities, foster new collaborations among early career researchers, and map out the shared future research directions of the communities. The structure of the workshop will follow closely our previous meeting: 2 series of lectures in the mornings and seminars in the afternoons.

Mercredi 2 Juillet 2025, 09:00 à IHP, Amphitheater "Yvonne Choquet-Bruhat", building Perrin, 2nd floor ( https://indico.global/event/14299/ )	WORK-CONF (Workshop or Conference)	gr-qc
Grampa 2025 At Institut Henri Poincaré	DAY 2
Abstract:	This is the second edition of the General Relativity from AMPlitudes Alliance (GRAMPA) workshop, whose primary goal is to support early-career researchers working in the field of scattering amplitudes applied to gravitational theories. The main theme of the workshop is to use of innovative techniques from the field of scattering amplitudes and beyond to study aspects of gravity relevant to upcoming gravitational wave experiments. There will be talks from GRAMPA members on aspects of their work in this field, as well as two short pedagogical lecture series by faculty researchers. The workshop will provide fertile ground for knowledge exchange between communities, foster new collaborations among early career researchers, and map out the shared future research directions of the communities. The structure of the workshop will follow closely our previous meeting: 2 series of lectures in the mornings and seminars in the afternoons.

Mercredi 2 Juillet 2025, 11:00 à DPT-PHYS-ENS, Salle 2 (pause café salle 1)- Collège de France	SEM-LKB (Séminaire du Laboratoire Kastler Brossel)	quant-ph
Almut Beige ( School of Physics and Astronomy at the University of Leeds in the UK )	Increasing wave-particle duality
Abstract:	One of the most surprising findings of quantum physics is wave-particle duality. However, having a closer look at our theories, we see that do not really use the same formalism to describe photons and quantum mechanical particles. To increase wave-particle duality, we recently introduced a local photon approach [1] which allows us to design locally acting mirror Hamiltonians. Our approach also allows us to define the momentum of light as in quantum mechanics as the generator for spatial translation. When analysing the momentum dynamics of photonic wave packets which transition from air into a dielectric medium, we gain new insight into the Abraham-Minkowski controversy [2]. Although our results align with Minkowski’s theory, there are also some crucial differences. [1] D. Hodgson, J. Southall, R. Purdy, and A. Beige, Local photons, Front. Photon. 3, 978855 (2022). [2] G. Waite, D. Hodgson, B. Lang, V. Alapatt and A. Beige, A local photon perspective on the momentum of light, Phys. Rev. A 111, 023703 (2025).

Jeudi 3 Juillet 2025, 09:00 à IHP, Amphitheater "Yvonne Choquet-Bruhat", building Perrin, 2nd floor ( https://indico.global/event/14299/ )	WORK-CONF (Workshop or Conference)	gr-qc
Grampa 2025 At Institut Henri Poincaré	DAY 3
Abstract:	This is the second edition of the General Relativity from AMPlitudes Alliance (GRAMPA) workshop, whose primary goal is to support early-career researchers working in the field of scattering amplitudes applied to gravitational theories. The main theme of the workshop is to use of innovative techniques from the field of scattering amplitudes and beyond to study aspects of gravity relevant to upcoming gravitational wave experiments. There will be talks from GRAMPA members on aspects of their work in this field, as well as two short pedagogical lecture series by faculty researchers. The workshop will provide fertile ground for knowledge exchange between communities, foster new collaborations among early career researchers, and map out the shared future research directions of the communities. The structure of the workshop will follow closely our previous meeting: 2 series of lectures in the mornings and seminars in the afternoons.

Jeudi 3 Juillet 2025, 14:00 à ESPCI, Room Charpak, entrance building, ground floor ( The Zoom Education link will be provided upon registration via the mailing list at seminaires-lpem@espci.fr. )	SEM-EXCEP (Seminaire exceptionnel)	cond-mat
Kamran Behnia ( Laboratoire de Physique et Etude de Matériaux, ESPCI, 75005 Paris, France )	Heat propagation in liquid 3He and metallic Fermi liquids
Abstract:	Normal liquid 3He inspired Landau’s Fermi liquid theory. What has been overlooked, however, is that fact that the agreement between this theory and the experimental data is restricted to very low temperature. On the other hand, the experimentally measured thermal conductivity can be explained as the sum of two contributions: one by quasi-particles and another by sound [2]. The first component has been known for decades. The second is known as zero sound [2], but in the hydrodynamic limit, when the collision rate exceeds the sound frequency. Propagation of heat by sound in a quantum liquid shall not be a surprise given the longstanding relevance of the Bridgman formula for thermal conductivity of classical liquids [3]. The case of 3He has implications for understanding the temperature dependence of transport coefficients in metals, ordinary or strange. [1] K. Behnia & K. Trachenko, Nature Commun. 15, 1771 (2024). [2] F. Albergamo et al., Phys. Rev. Lett. 99, 205301 (2007). [3] P. W. Bridgman, Proc. Am. Acad. Arts Sci. 59, 141–169 (1923).

Vendredi 4 Juillet 2025, 09:00 à IHP, Amphitheater "Yvonne Choquet-Bruhat", building Perrin, 2nd floor ( https://indico.global/event/14299/ )	WORK-CONF (Workshop or Conference)	gr-qc
Grampa 2025 At Institut Henri Poincaré	DAY 4
Abstract:	This is the second edition of the General Relativity from AMPlitudes Alliance (GRAMPA) workshop, whose primary goal is to support early-career researchers working in the field of scattering amplitudes applied to gravitational theories. The main theme of the workshop is to use of innovative techniques from the field of scattering amplitudes and beyond to study aspects of gravity relevant to upcoming gravitational wave experiments. There will be talks from GRAMPA members on aspects of their work in this field, as well as two short pedagogical lecture series by faculty researchers. The workshop will provide fertile ground for knowledge exchange between communities, foster new collaborations among early career researchers, and map out the shared future research directions of the communities. The structure of the workshop will follow closely our previous meeting: 2 series of lectures in the mornings and seminars in the afternoons.

Mardi 8 Juillet 2025, 14:00 à IHES, Amphithéâtre Léon Motchane	PT-IHES (Séminaire de physique théorique de l'IHES)	hep-th
Dam Thanh Son ( University of Chicago et IHES )	TBA

Mercredi 9 Juillet 2025, 10:30 à IHES, Amphithéâtre Léon Motchane	SEED (Seed Seminar of Mathematics and Physics)	math-ph
Philine Van Vliet ( LPTENS, École Normale Supérieure, Paris, France )	TBA

Mercredi 9 Juillet 2025, 17:00 à LPNHE, Amphitheatre 15, Sorbonne Université, Campus Jussieu ( 17h, café à partir de 16h30 )	SEM-EXCEP (Seminaire exceptionnel)	physics
Giulia Gubitosi ( Associate Professor, Université de Naples, INFN, Chair of COST Action BridgeQG )	Bridging High and Low Energies in Search of Quantum Gravity
Abstract:	The interplay between quantum mechanics and general relativity is one of the most profound open problems in fundamental physics. After decades of purely theoretical investigations, recent experimental advances turned the prospect of a phenomenological approach into a realistic possibility. On the one hand, searches for quantum gravity effects in astrophysical signals constitute nowadays an established field of fundamental research. On the other hand, table-top experiments with quantum systems are now advancing fast towards understanding the role of gravity in quantum systems and testing the possibility that gravity itself is quantized. Investigating the interface between high-energy quantum gravity and quantum aspects of gravity in the low-energy regime, using both theoretical and experimental tools, can provide complementary clues towards the construction of a phenomenologically viable theory of quantum gravity at all scales. In this talk, I will give an overview of the state of the art and key open questions of this research programme and describe the related activities of the COST Action BridgeQG (Bridging high and low energies in search of quantum gravity).

Jeudi 17 Juillet 2025, 11:00 à LPTMC, Jussieu, LPTMC seminar room, towers 13-12, 5th floor, room 523	SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée)	cond-mat
Zhengcheng Gu ( The Chinese University of Hong-Kong )	Tensor network simulation in strongly correlated systems: past, present and future
Abstract:	Tensor network states are new kinds of variational wavefunctions that help us to understand quantum phases and phase transitions beyond Landau paradigm. In this talk, I will first review the major development of tensor network simulation in the past two decades. I will introduce the novel concept of long-range entanglement and entanglement renormalization. Then I will discuss the major breakthroughs made by tensor network simulations in recent years. If time permits, I will also mention the relationship between deep learning and tensor network simulation.

Mardi 9 Septembre 2025, 16:00 à LPTHE, library ( Note the unusual time. )	LPTHE-PPH (Particle Physics at LPTHE)	hep-ph
Vasily Sotnikov ( University of Zurich )	TBA

Vendredi 12 Septembre 2025, 14:00 à LPTHE, library	LPTHE-PPH (Particle Physics at LPTHE)	hep-ph
Ekta Chaubey ( University of Bonn )	TBA