New Axion Dark Matter Search with ProtoPlanetary Disks

New Axion Dark Matter Search with Proto-Planetary Disks Tomohiro Fujita (Kyoto & Geneva) TF, Tazaki & Toma PRL 122, 191101 (Editor’s suggestion) 10 th. Sep. 2019 @TAUP

Protoplanetary Disk

Protoplanetary Disk Main Message Observations of Protoplanetary Disks provide a new and best method to search for axion dark matter!

introduction Who is Dark Matter?

introduction DM candidates Scalar Neutrino M-Gravity WIMP PBH Berton&Tait[1810. 01668] Other

introduction DM candidates Scalar Neutrino To identify DM, you need to detect M-Gravity WIMP characteristic signal of a DM candidate! PBH Berton&Tait[1810. 01668] Other

introduction DM candidates Scalar DM Berton&Tait[1810. 01668]

introduction Scalar Dark Matter (∋Axion & ALPs) Different from particle DMs: production & evolution In this talk, we make no assumption on its production

introduction What characterizes ADM?

introduction What characterizes ADM? Fuzzy DM (cf. Lyman-α limit) Decay into γ (hopeless to detect)

introduction What characterizes ADM? ADM breaks parity

introduction What characterizes ADM? ADM breaks parity ADM may be coupled to photon!!

introduction What characterizes ADM? ADM breaks parity ADM may be coupled to photon!! Useful to Search for DM

introduction Axion-Photon Coupling

introduction Axion-Photon Coupling Photon: Axion:

introduction Axion-Photon Coupling Photon: Axion: New terms! Conventionally constant magnetic field is introduced

introduction Axion-Photon Conversion Photon: Axion:

introduction Experiments with AP conversion Axion Helioscope

introduction Experiments with AP conversion Axion Helioscope

Current constraint Target space in our project (Possible region for ALPs DM)

introduction Axion-Photon Coupling Photon: Axion: New terms! Anything other than magnetic fields?

New experiment What if Axion is Dark Matter?

introduction Birefringence Photon Eo. M:

introduction [No superluminality: 1201. 4935] Birefringence Photon Eo. M: Dispersion relations of Left/Right Pol. are modified Speed of light changes depending on polarization!

New Observation Birefringence Another consequence: Rotation of liner pol. Plane Linear pol. Photon can be decomposed into circular pol. With ADM BG phase velocity are different, polarization plane rotates

New Observation Birefringence Rotation angle synchronizes with Axion Motion of the linear polarization plane

New Observation Birefringence Rotation angle synchronizes with Axion Motion of the linear polarization plane

New Observation Birefringence Rotation angle synchronizes with Axion Motion of the linear polarization plane

New Observation Birefringence How can we observe this? ? ?

New Observation Proto. Planetary Disk Observations of PPD can be used! PPD is a flattened gaseous object surrounding a young star. PPDs are bright simply by scattering the central star’s light. Real data Artist’s image

New Observation Polarization of PPD Scattered light should be polarized perpendicular to the scattering plane (=this monitor). Initial polarization Plane is known!!

New Observation Obsevation of PPD [Hashimoto et al. APJL 729: L 17(2011)] We expect a concentric pattern of linear polarization. Our Simulation without Axion DM Observation by SUBARU AB Aurigae (160 pc away)

New Observation Axion DM rotates pol. plane? Axion Birefringence

New Observation Axion DM rotates pol. plane? Axion Birefringence Is this angle 90° or not?

New Observation [Hashimoto et al. APJL 729: L 17(2011)] Obsevation of PPD The observation data reveals Our simulation confirms the effect of multiple Scatterings is negligible.

New Observation New constraint [TF. Tazaki & Toma (2018)] [See also Fedderke+ 1903. 02666]

New Observation New constraint [TF. Tazaki & Toma (2018)] [See also Fedderke+ 1903. 02666] Reach `hinted’ Coupling value Best bound on Fuzzy DM

Summary The same coupling causes Birefringence w/ ADM and linear polarization plane rotates Just beginning. Let’s think new one together!

Fin Thank you！