## 5th week (Feb 26–Mar 1): Dark energy and gravity beyond general relativity

Feb 26 (Mon) | Feb 27 (Tue) | Feb 28 (Wed) | Feb 29 (Thu) | Mar 1 (Fri) |
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10:00–10:25 coffee |
10:00–10:30 coffee |
10:00–10:30 coffee |
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opening | ||||

10:30–12:10 session |
10:30–11:00 coffee |
10:30–12:10 session |
10:30–11:00 coffee |
10:30–12:00 session |

11:00–12:00 session |
11:00–12:00 session |
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12:00–14:00 lunch |
12:00–14:00 lunch |
12:00–14:00 lunch |
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12:10–13:40 lunch |
12:10–13:40 lunch |
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13:40–15:00 session |
13:40–15:00 session |
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14:00–15:00 session |
14:00–15:00 session |
14:00–15:00 session |
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15:00–15:30 coffee |
15:00–15:30 coffee |
15:00–15:30 coffee |
15:00–15:30 coffee |
15:00–15:30 coffee |

15:30–16:40 session |
15:30–16:30 session |
15:30–16:10 session |
15:30–16:30 session |
15:30–16:30 session |

16:10–16:30 break |
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16:30–17:50 session |
closing | |||

16:40–17:00 break |
18:00–20:00 party |
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17:00–18:10 session |
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## Feb 26 (Mon) one-day workshop

10:00–10:25 coffee

10:25–10:30 Shinji Mukohyama (YITP) "Opening address"

Chair: Takahashi

- 10:30–11:30 (50min+10min) Anne-Christine Davis (Cambridge)

"Modified Gravity in Cosmology and the Laboratory" - 11:30–11:50 (15min+5min) Kota Numajiri (Nagoya)

"Relation of observables and the internal physics of neutron stars under F(R) gravity" [slides] - 11:50–12:10 (15min+5min) Carlos Pastor Marcos (Heidelberg)

"Black Hole and Neutron Star solutions in f(Q) gravity" [slides]

12:10–13:40 lunch

Chair: Yunes

- 13:40–14:40 (50min+10min) Thomas Sotiriou (Nottingham)

"Measuring scalar charge with EMRIs" - 14:40–15:00 (15min+5min) Kotaro Mizui (Waseda)

"Vainshtein screening of time and spatial scalar-field derivatives" [slides]

15:00–15:30 coffee

Chair: Aoki

- 15:30–16:00 (25min+5min) Vicharit Yingcharoenrat (Kavli IPMU)

"EFT of Black Hole Perturbations with Timelike Scalar Profile: Recent Progress" [slides] - 16:00–16:20 (15min+5min) Lewis Croney (KCL)

"Slowly-rolling scalars around rotating black holes" [slides] - 16:20–16:40 (15min+5min) Sergi Sirera Lahoz (Portsmouth)

"Testing the speed of gravity with black hole ringdown" [slides]

16:40–17:00 break

- 17:00–17:30 (25min+5min) Masashi Kimura (Daiichi Inst. Tech.)

"Perturbative quasinormal mode frequencies" - 17:30–17:50 (15min+5min) Jiale Zhang (Ochanomizu)

"Parametrized Black Hole Quasinormal Ringdown Formalism for Higher Overtones" - 17:50–18:10 (15min+5min) Jin Saito (Rikkyo)

"Post-Newtonian approximations in the U-DHOST theory" [slides]

## Feb 27 (Tue) seminar day

10:30–11:00 coffee

Chair: Afshordi

- 11:00–12:00 (50min+10min) Mordehai Milgrom (Weizmann Institute)

"The MOND-cosmology nexus" [slides]

12:00–14:00 lunch

Chair: Aoki

- 14:00–14:30 (25min+5min) Masato Minamitsuji (Lisbon)

"Black hole thermodynamics in Horndeski theories" [slides] - 14:30–15:00 (25min+5min) Justin Feng (LeCosPA)

"Singularity at the demise of a black hole" [slides]

15:00–15:30 coffee

- 15:30–16:00 (25min+5min) Sinya Aoki (YITP)

"A conserved charge in general relativity" [slides] - 16:00–16:30 (25min+5min) Chen-Te Ma (Iowa State U)

"Modular Average and Weyl Anomaly in Two-Dimensional Schwarzian Theory" [slides]

## Feb 28 (Wed) one-day workshop

10:00–10:30 coffee

Chair: Sotiriou

- 10:30–11:30 (50min+10min) Enrico Barausse (SISSA)

"Gravitational wave generation in effective field theories of dark energy" - 11:30–11:50 (15min+5min) Daiki Watarai (RESCEU)

"Physically consistent gravitational waveform for capturing beyond general relativity effects in the compact object merger phase" [slides] - 11:50–12:10 (15min+5min) Che-Yu Chen (RIKEN)

"Resonant orbits and chaos of rotating black holes beyond circularity" [slides]

12:10–13:40 lunch

Chair: Barausse

- 13:40–14:10 (25min+5min) Dina Traykova (AEI)

"Scalar wave emission in theories with kinetic screening" - 14:10–14:40 (25min+5min) Hao-Jui Kuan (AEI)

"Binary neutron star mergers in massive scalar-tensor theory" [slides] - 14:40–15:00 (15min+5min) Tsz Lok Lam (AEI)

"Binary neutron star mergers in massive scalar-tensor theory: fate of post-merger remnants"

15:00–15:30 coffee

Chair: Oshita

- 15:30–15:50 (15min+5min) Shiqian Hu (KCL)

"Seeded vacuum decay with Gauss-Bonnet" [slides] - 15:50–16:10 (15min+5min) Lu Yin (APCTP)

"Is Cosmic Birefringence model-dependent?" [slides]

16:10–16:30 break

- 16:30–17:00 (25min+5min) Jibril Ben Achour (ÉNS Lyon/Munich)

"Exploring non-perturbative gravitational waves in Horndeski gravity" - 17:00–17:30 (25min+5min) Wei-Chen Lin (PNU)

"Spacetime surgery for black hole" - 17:30–17:50 (15min+5min) Sebastian Murk (OIST)

"Kinematic and thermodynamic properties of dynamical regular black holes" [slides]

## Feb 29 (Thu) seminar day

10:30–11:00 coffee

Chair: Davis

- 11:00–12:00 (50min+10min) Andrew Tolley (Imperial)

"Vainshtein Screening, Galileons and Massive Gravity" [slides]

12:00–14:00 lunch

Chair: Aoki

- 14:00–14:30 (25min+5min) Junsei Tokuda (IBS)

"Gravitational positivity bounds from finite energy sum rules" [slides] - 14:30–15:00 (25min+5min) Kazuharu Bamba (Fukushima)

"Holographic dark energy for inflationary cosmology and the trans-Planckian censorship conjecture" [slides]

15:00–15:30 coffee

- 15:30–16:00 (25min+5min) Taishi Katsuragawa (CCNU)

"F(R) gravity and chameleon mechanism in early Universe" - 16:00–16:30 (25min+5min) Anamaria Hell (Kavli IPMU)

"The two faces of R2 gravity"

## Mar 1 (Fri) one-day workshop + party

10:00–10:30 coffee

Chair: Mukohyama

- 10:30–11:30 (50min+10min) Nicolás Yunes (UIUC)

"Parity when gravity waves" - 11:30–12:00 (25min+5min) Filipe Mena (Lisbon)

"Mathematical problems of generalised theories of gravity"

12:00–14:00 lunch

Chair: Takahashi

- 14:00–14:30 (25min+5min) Maria Mylova (Kavli IPMU)

"Effective Field Theory of the Cuscuton" - 14:30–15:00 (25min+5min) Zhibang Yao (Rikkyo)

"Interacting massless gravitons from extended minimal theory of bigravity" [slides]

15:00–15:30 coffee

Chair: Yingcharoenrat

- 15:30–15:50 (15min+5min) Ryuya Kudo (Hirosaki)

"Photon region in stationary cylindrically symmetric spacetimes" [slides] - 15:50–16:10 (15min+5min) Mahmoud Ahmed Ali (Tokyo)

"Irreversible relativistic effects and spacetime curvature" [slides] - 16:10–16:30 (15min+5min) Simran Arora (Birla Inst. Tech. Sci.)

"On the impact of f(Q) gravity on the Large Scale Structure" [slides]

16:30–16:35 Shinji Mukohyama (YITP) "Closing"

18:00–20:00 party