About Me

I'm a theoretical scientist in Nagoya University, Japan. My main interest is the physics of the early stage of our universe. In particular, I have so far focused on inflation, the accelerated expansion preceding the hot Big-Bang universe. I have proposed a novel analyzing approach to inflation with use of mathematics of random noise called stochastic calculus. Primordial black hole is also my research topic as a direct consequence of particular dynamics of the early universe. I'm working on several production mechanism of gravitational waves as well. I'm from Saitama, Japan. I completed B.Sc. in Physics in 2012 and M.Sc. in Physics in 2014, and received Ph.D. in Physics from the University of Tokyo in March 2017.

Contact Details

Yuichiro Tada
ES bldg. 604, Nagoya University
Furocho Chikusaku Nagoya, Aichi 464-8602 Japan
+81 (0)80-9566-9181
tada.yuichiro.y8@f.mail.nagoya-u.ac.jp

Education

The University of Tokyo

Ph.D. in Physics 23rd March 2017
Department of Physics, Adviser: Dr. Masahiro Kawasaki & Dr. Hitoshi Murayama

The University of Tokyo

M.Sc. in Physics 24th March 2014
Department of Physics, Adviser: Dr. Masahiro Kawasaki & Dr. Hitoshi Murayama

The University of Tokyo

B.Sc. in Physics 23rd March 2012
Department of Phyiscs

Kaichi high school

Graduate March 2008

Career

Nagoya University

Designated Assistant Professor April 2021–Present
Institute for Advanced Research & Department of Physics, C-lab.

High Energy Accelerator Research Organization

Associate Researcher April 2022–March 2023
Institute of Particle and Nuclear Studies

Daido University

Lecturer (part-time) April 2019–March 2021
Classical mechanics 1, 2

Nagoya University

JSPS Fellow (PD) April 2018–March 2021
C-lab., Department of Physics

Institute d'Astrophysique de Paris

PD researcher April 2017–March 2018
Dr. Sébastien Renaux-Petel's Group

The University of Tokyo

JSPS Fellow (DC2) April 2015–March 2017
Kavli IPMU & ICRR

The University of Tokyo

ALPS Fellow October 2012–March 2017
Kavli IPMU & ICRR

2024

[48] Primordial black holes and induced gravitational waves from logarithmic non-Gaussianity
R. Inui, C. Joana, H. Motohashi, S. Pi, Y. Tada and S. Yokoyama
arXiv: 2411.07647 [astro-ph.CO].

[47] Towards a classification of UV completable Higgs inflation in metric-affine gravity
Y. Mikura and Y. Tada
arXiv: 2410.11277 [hep-th].

[46] Improved quantum algorithm for calculating eigenvalues of differential operators and its application to estimating the decay rate of the perturbation distribution tail in stochastic inflation
K. Miyamoto and Y. Tada
arXiv: 2410.02276 [quant-ph].

[45] Constant roll and non-Gaussian tail in light of logarithmic duality
R. Inui, H. Motohashi, S. Pi, Y. Tada and S. Yokoyama
arXiv: 2409.13500 [astro-ph.CO].

[44] STOLAS: STOchastic LAttice Simulation of cosmic inflation
Y. Mizuguchi, T. Murata and Y. Tada
arXiv: 2405.10692 [astro-ph.CO].

[43] Multifield Stochastic Dynamics in GUT Hybrid Inflation and Gravitational Wave Signatures of GUT Higgs Representation
Y. Tada and M. Yamada
Phys. Lett. B 855 (2024), 138854 [arXiv: 2405.08859 [hep-ph]].

[42] The LISA forecast on a smooth crossover beyond the Standard Model through the scalar-induced gravitational waves
A. Escriva, R. Inui, Y. Tada and C. M. Yoo
arXiv: 2404.12591 [astro-ph.CO].

[41] Quintessential interpretation of the evolving dark energy in light of DESI
Y. Tada and T. Terada
Phys. Rev. D 109 (2024) no.12, L121305 [arXiv: 2404.05722 [astro-ph.CO]].

2023

[40] Prospects of detection of subsolar mass primordial black hole and white dwarf binary mergers
T. S. Yamamoto, R. Inui, Y. Tada and S. Yokoyama
Phys. Rev. D 109 (2024) no.10, 103514 [arXiv: 2401.00044 [gr-qc]].

[39] Primordial Black Holes and induced gravitational waves from a smooth crossover beyond Standard Model
A. Escrivà, Y. Tada and C. M. Yoo
arXiv: 2311.17760 [astro-ph.CO].

[38] Cancellation of quantum corrections on the soft curvature perturbations
Y. Tada, T. Terada and J. Tokuda
JHEP 01 (2024), 105 [arXiv: 2308.04732 [hep-th]].

[37] Translating nano-Hertz gravitational wave background into primordial perturbations taking account of the cosmological QCD phase transition
K. T. Abe and Y. Tada
Phys. Rev. D 108 (2023) no.10, L101304 [arXiv: 2307.01653 [astro-ph.CO]].

[36] Stochastic dynamics of multi-waterfall hybrid inflation and formation of primordial black holes
Y. Tada and M. Yamada
JCAP 11 (2023), 089 [arXiv: 2306.07324 [astro-ph.CO]].

[35] Primordial black hole formation in hybrid inflation
Y. Tada and M. Yamada
Phys. Rev. D 107, no.12, 123539 (2023) [arXiv: 2304.01249 [astro-ph.CO]].

[34] Squeezed bispectrum and one-loop corrections in transient constant-roll inflation
H. Motohashi and Y.Tada
JCAP 08 (2023), 069 [arXiv: 2303.16035 [astro-ph.CO]].

2022

[33] Primordial Black Holes
A. Escrivà, F. Kuhnel and Y. Tada
Black Holes in the Era of Gravitational-Wave Astronomy, Elsevier, 2024, 261-377 [arXiv: 2211.05767 [astro-ph.CO]].

[32] Primordial black holes and gravitational waves induced by exponential-tailed perturbations
K. T. Abe, R. Inui, Y. Tada and S. Yokoyama
JCAP 05, 044 (2023) [arXiv: 2209.13891 [astro-ph.CO]].

[31] Hybrid metric-Palatini Higgs inflation
M. He, Y. Mikura and Y. Tada
JCAP 05, 047 (2023) [arXiv: 2209.11051 [hep-th]].

[30] Effective inspiral spin distribution of primordial black hole binaries
Y. Koga, T. Harada, Y. Tada, S. Yokoyama and C. M. Yoo
Astrophys. J. 939, no.2, 65 (2022) [arXiv: 2208.00696 [gr-qc]].

[29] Stochastic formalism for U(1) gauge fields in axion inflation
T. Fujita, K. Mukaida and Y. Tada
JCAP 12 (2022), 026 [arXiv: 2206.12218 [astro-ph.CO]].

[28] Effective treatment of U(1) gauge field and charged particles in axion inflation
T. Fujita, J. Kume, K. Mukaida and Y. Tada
JCAP 09 (2022), 023 [arXiv: 2204.01180 [hep-ph]].

[27] Simulation of Primordial Black Holes with large negative non-Gaussianity
A. Escrivà, Y. Tada, S. Yokoyama and C. M. Yoo
JCAP 05 (2022), no.05, 012 [arXiv: 2202.01028 [astro-ph.CO]].

2021

[26] Statistics of coarse-grained cosmological fields in stochastic inflation
Y. Tada and V. Vennin
JCAP 02 (2022), no.02, 021 [arXiv: 2111.15280 [astro-ph.CO]].

[25] On UV-completion of Palatini-Higgs inflation
Y. Mikura and Y. Tada
JCAP 05 (2022), no.05, 035 [arXiv: 2110.03925 [hep-ph]].

[24] Primordial black holes in peak theory with a non-Gaussian tail
N. Kitajima, Y. Tada, S. Yokoyama and C. M. Yoo
JCAP 10 (2021), 053 [arXiv: 2109.00791 [astro-ph.CO]].

[23] Minimal $k$-inflation in light of the conformal metric-affine geometry
Y. Mikura, Y. Tada and S. Yokoyama
Phys. Rev. D 103 (2021), no.10, L101303 [arXiv: 2103.13045 [hep-th]].

[22] Revisiting non-Gaussianity in non-attractor inflation models in the light of the cosmological soft theorem
T. Suyama, Y. Tada and M. Yamaguchi
PTEP 2021 (2021), no. 7, 073E02 [arXiv: 2101.10682 [hep-th]].

2020

[21] Induced gravitational waves as a cosmological probe of the sound speed during the QCD phase transition
K. T. Abe, Y. Tada and I. Ueda
JCAP 06 (2021), 048 [arXiv: 2010.06193 [astro-ph.CO]].

[20] Local observer effect on the cosmological soft theorem
T. Suyama, Y. Tada and M. Yamaguchi
PTEP 2020 (2020), no.11, 113E01 [arXiv: 2008.13364 [astro-ph.CO]].

[19] A manifestly covariant theory of multifield stochastic inflation in phase space
L. Pinol, S. Renaux-Petel and Y. Tada
JCAP 04 (2021), 048 [arXiv: 2008.07497 [astro-ph.CO]].

[18] Conformal inflation in the metric-affine geometry
Y. Mikura, Y. Tada and S. Yokoyama
EPL 132 (2020), no.3, 39001 [arXiv: 2008.00628 [hep-th]].
Highlights of 2020

[17] Escape from the swamp with spectator
K. Kogai and Y. Tada
Phys. Rev. D 101 (2020), no.10, 103514 [arXiv: 2003.06753 [astro-ph.CO]].

2019

[16] Stochastic inflation with an extremely large number of $e$-folds
N. Kitajima, Y. Tada and F. Takahashi
Phys. Lett. B 800 (2020), 135097 [arXiv: 1908.08694 [hep-ph]].

[15] Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes
Y. Tada and S. Yokoyama
Phys. Rev. D 100 (2019), no. 2, 023537 [arXiv: 1904.10298 [astro-ph.CO]].

2018

[14] Inflationary stochastic anomalies
L. Pinol, S. Renaux-Petel and Y. Tada
Class. Quant. Grav. 36 (2019), no. 7, 07LT01 [arXiv: 1806.10126 [gr-qc]].
Highlights of 2019–20

2017

[13] $\mathcal O(10) M_\odot$ primordial black holes and string axion dark matter
K. Inomata, M. Kawasaki, K. Mukaida, Y. Tada and T. T. Yanagida
Phys. Rev. D 96 (2017), no. 12, 123527 [arXiv: 1709.07865 [astro-ph.CO]].

[12] Does the detection of primordial gravitational waves exclude low energy inflation?
T. Fujita, R. Namba and Y. Tada
Phys. Lett. B 778 (2018), 17 [arXiv: 1705.01533 [astro-ph.CO]].

[11] Inflationary Primordial Black Holes as All Dark Matter
K. Inomata, M. Kawasaki, K. Mukaida, Y. Tada and T. T. Yanagida
Phys. Rev. D 96 (2017), no. 4, 043504 [arXiv: 1701.02544 [astro-ph.CO]].

2016

[10] Inflationary primordial black holes for the LIGO gravitational wave events and pulsar timing array experiments
K. Inomata, M. Kawasaki, K. Mukaida, Y. Tada and T. T. Yanagida
Phys. Rev. D 95 (2017), no. 12, 123510 [arXiv: 1611.06130 [astro-ph.CO]].

[9] Squeezed Bispectrum in the $\delta N$ Formalism: Local Observer Effect in Field Space
Y. Tada and V. Vennin
JCAP 1702 (2017), no. 02, 021 [arXiv: 1609.08876 [astro-ph.CO]].

[8] Primordial black holes as dark matter in supergravity inflation models
M. Kawasaki, A. Kusenko, Y. Tada and T. T. Yanagida
Phys. Rev. D 94 (2016), no. 8, 083523 [arXiv: 1606.07631 [astro-ph.CO]].

[7] Revisiting constraints on small scale perturbations from big-bang nucleosynthesis
K. Inomata, M. Kawasaki and Y. Tada
Phys. Rev. D 94 (2016), no. 4, 043527 [arXiv: 1605.04646 [astro-ph.CO]].

2015

[6] Can massive primordial black holes be produced in mild waterfall hybrid inflation?
M. Kawasaki and Y. Tada
JCAP 1608 (2016), no. 08, 041 [arXiv: 1512.03515 [astro-ph.CO]].

[5] Consistent generation of magnetic fields in axion inflation models
T. Fujita, R. Namba, Y. Tada, N. Takeda and H. Tashiro
JCAP 1505 (2015), no. 05, 054 [arXiv: 1503.05802 [astro-ph.CO]].

[4] Primordial black holes as biased tracers
Y. Tada and S. Yokoyama
Phys. Rev. D 91 (2015), 123534 [arXiv: 1502.01124 [astro-ph.CO]].

2014

[3] Anisotropic CMB distortions from non-Gaussian isocurvature perturbations
A. Ota, T. Sekiguchi, Y. Tada and S. Yokoyama
JCAP 1503 (2015), no. 03, 013 [arXiv: 1412.4517 [astro-ph.CO]].

[2] Non-perturbative approach for curvature perturbations in stochastic-$\delta N$ formalism
T. Fujita, M. Kawasaki and Y. Tada
JCAP 1410 (2014), no. 10, 030 [arXiv: 1405.2187 [astro-ph.CO]].

2013

[1] A new algorithm for calculating the curvature perturbations in stochastic inflation
T. Fujita, M. Kawasaki, Y. Tada and T. Takesako
JCAP 1312 (2013), 036 [arXiv: 1308.4754 [astro-ph.CO]].


Curvature Perturbations and Primordial Black Hole Formation in the Inflationary Universe

Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Kavli Institute for the Physics and Mathematics of the Universe (WPI), UTIAS, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan
Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan

Referees
Dr. Masahiro Kawasaki Supervisor
Dr. Hitoshi Murayama Supervisor
Dr. Koichi Hamaguchi Chief Examiner
Dr. Aya Bamba Examiner
Dr. Masahiro Ibe Examiner
Dr. Shinji Miyoki Examiner
Dr. Jun’ichi Yokoyama Examiner


The stochastic approach to the inflationary universe

Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Kavli Institute for the Physics and Mathematics of the Universe (WPI), UTIAS, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan

Referees
Dr. Masahiro Kawasaki Supervisor
Dr. Hitoshi Murayama Supervisor
Dr. Jun’ichi Yokoyama Examiner


Books

Black Holes in the Era of Gravitational-Wave Astronomy

Invited Chapter "Primordial Black Holes" with A. Escriva, F. Kuhnel

Editor: Manuel Arca Sedda, Elisa Bortolas, Mario Spera
ISBN: 978-0-323-95636-9

Conferences

2024

Evolution of the inhomogeneous universe: From Inflation to structure formation
STOLAS: STOchastic LAttice Simulation of cosmic inflation ▼
Y. Mizuguchi, T. Murata and Y. Tada
7th November 2024 @ KEK
oral, invited

Looping in the Primordial Universe
Cancellation of quantum corrections on the soft curvature perturbations ▼
Y. Tada, T. Terada, J. Tokuda
29th October 2024 @ CERN
oral, refereed

CAS-IBS CTPU-CGA-Tokyo Tech 2024 Workshop on Cosmology, Gravity, Particle Physics
Cancellation of quantum corrections on the soft curvature perturbations ▼
Y. Tada, T. Terada, J. Tokuda
17th October 2024 @ Kyukamura, Irago
invited talk

Dynamics of primordial black hole formation II
Cancellation of quantum corrections on the soft curvature perturbations
Y. Tada, T. Terada, J. Tokuda
7th October 2024 @ Nagoya U.
organiser

iTHEMS Cosmology Forum No.2
Scalar-induced gravitational waves as a cosmological phonograph ▼
Y. Tada
27th September 2024 @ iTHEMS
invited talk

Fourth Mini-workshop on the Early Universe
On the UV-completion and gravitational waves in the reheating of hybrid metric-Palatini Higgs inflation ▼
M. He, T. Hiramatsu, Y. Mikura, Y. Tada
5th September 2024 @ Yatsugatake Commons
oral, refereed

Joint Seminar
Quintessential interpretation of the evolving dark energy in light of DESI ▼
S. Hayashi, H. Miyatake, Y. Tada, T. Terada
17th June 2024 @ UTokyo
invited talk

Joint workshop on General Relativity and Cosmology
Dive into the Cosmic Abyss: Echoes from Primordial Black Hole
Y. Tada
7th March 2024 @ Sunshine Shirako
invited talk

YITP long-term workshop "Gravity and Cosmology 2024"
Cancellation of quantum corrections on the soft curvature perturbations ▼
Y. Tada, T. Terada, J. Tokuda
29th January 2024 @ YITP
oral, refereed

2023

The 32nd Texas Symposium on Relativistic Astrophysics
The present and future of primordial black holes as dark matter
Y. Tada
12th December 2023 @ Everbright International Hotel (Shanghai)
invited talk

KASHIWA DARK MATTER SYMPOSIUM 2023
The present and future of primordial black holes as dark matter
Y. Tada
5th December 2023 @ Kashiwa Library Media Hall
invited talk

JGRG 32
Cancellation of quantum corrections on the soft curvature perturbations ▼
Y. Tada, T. Terada, J. Tokuda
27th September 2023 @ Nagoya U.
oral, refereed

COSMO'23
Squeezed bispectrum and one-loop corrections in transient constant-roll inflation ▼
H. Motohashi, Y. Tada, T. Terada, J. Tokuda
15th September 2023 @ IFT
oral, refereed

YITP International Molecule-type Workshop "Revisiting cosmological non-linearities in the era of precision surveys"
Stochastic approach to the inflationary universe ▼
Y. Tada
27th July 2023 @ YITP
oral, invited

New Horizons in Primordial Black Hole Physics
Statistics of coarse-grained cosmological fields in stochastic inflation ▼
Y. Tada and V. Vennin
19th June 2023 @ Naples
oral, refereed

i-LINK workshop on observational cosmology
Revisiting the formation of massive primordial black holes in hybrid inflation
Y. Tada and M. Yamada
7th June 2023 @ Nagoya
oral, refereed

Domestic Molecule-type Workshop "Non-linear Nature of Cosmological Perturbations and its Observational Consequences"
On the soft theorem in the transient ultra-slow or constant roll inflation
H. Motohashi and Y. Tada
28th March 2023 @ YITP
oral, invited

19th Rencontres du Vietnam "Theory meeting experiments: particle astrophysics and cosmology"
Inflation theory — D'où venons-nous? Que sommes-nous? Où allons-nous? —
Y. Tada
8th January 2023 @ ICISE
oral, invited

2022

TSQS 2022
Stochastic approach to cosmic inflation ▼
Y. Tada
8th November 2022 @ The University of Tokyo
poster, refereed

JGRG31
Hybrid metric-Palatini Higgs inflation ▼
M. He, Y. Mikura, and Y. Tada
25th October 2022 @ The University of Tokyo
oral, refereed

Observational Cosmology Summer Workshop in 2022
Lattice simulation of stochastic inflation
Y. Tada
29th August 2022 @ The Ocean, HAMANAKO BENTEN RESORT & Maisaka cooperation center, Hamamatsu
oral, invited

FY2021 学術変革領域研究「ダークマター」シンポジウム
Primordial black holes and induced gravitational waves in light of the non-Gaussian tail ▼
K. T. Abe, A. Escrivà, N. Kitajima, R. Inui, Y. Tada, S. Yokoyama, C. M. Yoo
30th March 2022 @ Kavli IPMU (online)
oral, invited

2021

JGRG30
Probability density functions of coarse-grained curvature and density perturbations in stochastic inflation ▼
Y. Tada and V. Vennin
9th December 2021 @ Waseda U. (online)
oral, refereed

The KEK-PH + KEK-Cosmo joint workshop on "Primordial Black Holes"
Primordial black holes in peak theory with a non-Gaussian tail ▼
N. Kitajima, Y. Tada, S. Yokoyama and C. M. Yoo
19th October 2021 @ KEK (online)
oral, refereed

COSMO'21
Probability density functions of coarse-grained curvature and density perturbations in stochastic inflation ▼
Y. Tada and V. Vennin
2–6th August 2021 @ The University of Illinois (online)
poster, refereed

2021 NRF-JSPS Workshop in particle physics, cosmology, and gravitation
Primordial black holes in peak theory with a non-Gaussian tail
N. Kitajima, Y. Tada, S. Yokoyama, and C-M. Yoo
21st July 2021 @ Alpensia Resort, Pyeongchang, Korea / online
oral, invited

2020

Online JGRG Workshop 2020
Manifestly covariant theory of stochastic inflation ▼
L. Pinol, S. Renaux-Petel, and Y. Tada
25th November 2020 @ online
poster, refereed
Outstanding Presentation Award Gold Prize

PBH & Stochastic inflation workshop
StocDeltaN: numerical approach to inflation in combination of the stochastic and delta N formalism ▼
S. Renaux-Petel, Y. Tada, and V. Vennin
10th November 2020 @ online
oral, invited

The 14th International Conference on Gravitation, Astrophysics and Cosmology (ICGAC14)
Manifestly covariant theory of stochastic inflation ▼
L. Pinol, S. Renaux-Petel, Y. Tada, and V. Vennin
20th August 2020 @ National Central University, Taiwan (online)
oral, refereed

The 3rd KMI School:Machine Learning in Particle and Astrophysics
StocDeltaN: numerical approach to inflation beyond the perturbation theory in the stochastic formalism ▼
S. Renaux-Petel, Y. Tada, and V. Vennin
6th March 2020 @ Nagoya U.
poster, refereed
POSTPONED

2019

Focus Week on Primordial Black Holes
Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes ▼
Y. Tada and S. Yokoyama
6th December 2019 @ KavliIPMU
oral, refereed

JGRG29
Stochastic inflation with an extremely large number of e-folds ▼
N. Kitajima, Y. Tada, and F. Takahashi
27th November 2019 @ Kobe U.
oral, refereed

Theoretical aspects of non-Gaussianity from modern perspectives
Stochastic approach to non-Gaussianity
Y. Tada and V. Vennin
19th November 2019 @ YITP
oral, refereed

GWPAW 2019
Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes
Y. Tada and S. Yokoyama
16th October 2019 @ Sanjo Kaikan, The University of Tokyo
oral, refereed

COSMO19
Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes ▼
Y. Tada and S. Yokoyama
4th September 2019 @ RWTH Aachen U.
poster, refereed

15th Rencontres du Vietnam "COSMOLOGY"
Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes ▼
Y. Tada and S. Yokoyama
16th August 2019 @ ICISE
oral, invited

3-day workshop: INFLATION AND GEOMETRY
Stochastic formalism and curvature perturbation ▼
T. Fujita, L. Pinol, S. Renaux-Petel, Y. Tada, J. Tokuda, and V. Vennin
13th June 2019 @ IAP
oral, invited

2-day mini-workshop: Axion Cosmology
PBH tower in multi-phase inflation ▼
Y. Tada and S. Yokoyama
15th May 2019 @ YITP
oral, refereed

Future Perspective in Cosmology and Gravity
PBH tower in multi-phase inflation ▼
Y. Tada and S. Yokoyama
3rd April 2019 @ Nagoya U.
oral, refereed

Accelerating Universe in the Dark
PBH tower in multi-phase inflation ▼
Y. Tada and S. Yokoyama
7th March 2019 @ Kyoto U.
oral, refereed

FAPESP-JSPS Workshop on dark energy, dark matter, and galaxies
Aspects of primordial black hole as dark matter
K. Inomata, M. Kawasaki, A. Kusenko, K. Mukaida, Y. Tada, T. T. Yanagida, and S. Yokoyama
19th February 2019 @ U. of Sao Paulo
oral, refereed
Young Representative Speaker

2018

JGRG28
Stochastic formalism and curvature perturbations ▼
T. Fujita, L. Pinol, S. Renaux-Petel, Y. Tada, and J. Tokuda
8th November 2018 @ Rikkyo U.
oral, refereed

MOGRA 2018
Stochastic inflation in a general field space ▼
T. Fujita, L. Pinol, S. Renaux-Petel, Y. Tada, and J. Tokuda
10th August 2018 @ Nagoya U.
oral, refereed

Fifteenth Marcel Grosmann Meeting
Stochastic inflation in a general field space ▼
T. Fujita, L. Pinol, S. Renaux-Petel, Y. Tada, and J. Tokuda
5th July 2018 @ University of Rome "La Sapienza"
oral, refereed

Infrared physics of gauge theories and quantum dynamics of inflation
Subtleties in stochastic formalism - Ito vs. Stratonovich ▼
L. Pinol, S. Renaux-Petel, and Y. Tada
20th–21st January 2018 @ Biwako Club
oral, refereed

2017

COSMO 17
Stochastic Formalism in Curved Field Space ▼
L. Pinol, S. Renaux-Petel, and Y. Tada
28th August–1st September 2017 @ the Universite Paris Diderot site, Amphitheatre Buffon
oral, refereed

Gordon Research Conference & Seminars "String Theory & Cosmology"
Primordial Black Hole, Dark Matter, and Gravitational Wave ▼
K. Inomata, M. Kawasaki, A. Kusenko, K. Mukaida, Y. Tada, and T. T. Yanagida
27th May–2nd June 2017 @ Renaissance Tuscany Il Ciocco, Lucca (Barga), Italy
poster, refereed

2016

The 26th Workshop on General Relativity and Gravitation in Japan (JGRG26)
Squeezed Bispectrum in the delta N Formalism without Gauge Artifact
Y. Tada and V. Vennin
24th–28th October 2016 @ Osaka City University
oral, refereed

RESCEU Summer School
PBH Dark Matter in Supergravity Inflation Models
M. Kawasaki, A. Kusenko, Y. Tada, and T. T. Yanagida
24th–28th August 2016 @ Gifu
oral, not refereed

2015

Second LeCosPA International Symposium "Everything About Gravity"
Can massive primordial black holes be produced in mild waterfall hybrid inflation?
M. Kawasaki and Y. Tada
14th–18th December 2015 @ NTU
oral, refereed

International Conference on Particle Physics and Cosmology (COSMO-15)
PRIMORDIAL BLACK HOLES AS BIASED TRACERS
Y. Tada and S. Yokoyama
7th–11th September 2015 @ Warsaw
oral, refereed

2014

International Conference on Particle Physics and Cosmology (COSMO 2014)
Non-perturbative approach for curvature perturbations in stochastic-delta N formalism
T. Fujita, M. Kawasaki, and Y. Tada
25th–29th August 2014 @ Chicago
poster, refereed

2013

KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2013 FALL)
A new algorithm for calculating the curvature perturbations in stochastic inflation
T. Fujita, M. Kawasaki, Y. Tada, and T. Takesako
30th September–3rd October 2013 @ KEK
oral, refereed


Conferences (JPN)

2024

第13回 観測的宇宙論ワークショップ
DESI による時間発展暗黒エネルギー観測のクインテッセンス解釈 ▼
多田祐一郎, 寺田隆広
2024年9月25日 @ 金沢大
口頭, 査読あり

日本物理学会
DESI による時間発展暗黒エネルギー観測のクインテッセンス解釈 ▼
多田祐一郎, 寺田隆広
2024年9月18日 @ 北海道大
口頭, 査読なし

"Physics meets Mathematics" Summary Workshop
インフレーションと超準解析 — 原始ブラックホールに向けて —
多田祐一郎
2024年2月10–12日 @ 明治元年創業びわ湖畔の料理旅館 恵美寿荘
主催

2023

基研研究会 素粒子物理学の進展2023 (PPP2023)
原始ブラックホールは自然科学なのか
多田祐一郎
2023年9月1日 @ YITP
招待講演

日本物理学会春季大会
多重滝場ハイブリッドインフレーションと原始ブラックホール ▼
多田祐一郎, 山田將樹
2023年3月23日 @ オンライン
口頭, 査読なし

2022

第35回 理論懇シンポジウム
原始ブラックホール研究の近年の進展 ▼
多田祐一郎
2022年12月21–23日 @ 福島
ポスター, 査読あり

第11回観測的宇宙論ワークショップ
曲率ゆらぎへの非摂動的アプローチ ▼
多田祐一郎
2022年12月13日 @ 国立天文台
招待講演

Workshop on Gravitation & Cosmology
Recent progress on stochastic inflation
多田祐一郎
2022年11月29日 @ 富山
集中講義

日本物理学会秋季大会
アクシオンインフレーションにおける U(1) ゲージ場の確率形式 ▼
藤田智弘, 向田享平, 多田祐一郎
2022年9月6日 @ 岡山理科大
口頭, 査読なし

日本物理学会第77回年次大会
原始ブラックホールのピーク理論と非ガウス尾 ▼
A. Escrivà, 北嶋直弥, 多田祐一郎, 横山修一郎, 柳哲文
2022年3月17日 @ オンライン
口頭, 査読なし

2021

DECIGO workshop
インフレーションの「現在」と重力波
多田祐一郎
2021年12月11日 @ オンライン
口頭, 招待

日本物理学会秋季大会
粗視化曲率ゆらぎの確率密度関数 ▼
多田祐一郎 and V. Vennin
2021年9月14日 @ オンライン
口頭, 査読なし

日本物理学会第76回年次大会
インフレーションの確率形式に対する共変な定式化 ▼
L. Pinol, S. Renaux-Petel, 多田祐一郎
2021年3月13日 @ オンライン
口頭, 査読なし

2020

日本物理学会秋季大会
Escape from the swamp with spectator ▼
小粥一寛, 多田祐一郎
2020年9月15日 @ 筑波大学 (オンライン)
口頭, 査読なし

日本物理学会第75回年次大会
極長ストカスティックインフレーション ▼
北嶋直弥, 多田祐一郎, 高橋史宜
2020年3月17日 @ 名古屋大学
口頭, 査読なし

2019

日本物理学会秋季大会
多段階インフレーションによる原始ブラックホールタワー ▼
多田祐一郎, 横山修一郎
2019年9月20日 @ 山形大学
口頭, 査読なし

2018

第31回 理論懇シンポジウム
ストカスティックインフレーションと曲率ゆらぎ ▼
藤田智弘, L. Pinol, S. Renaux-Petel, 多田祐一郎, 徳田順生
2018年12月19–21日 @ 京都大
ポスター, 査読なし
CANCELLED

日本物理学会秋季大会
ストカスティックインフレーションのノイズ処方について ▼
藤田智弘, L. Pinol, S. Renaux-Petel, 多田祐一郎, 徳田順生
2018年9月14日 @ 信州大
口頭, 査読なし

2017

日本物理学会秋季大会
曲がった場空間におけるストカスティック形式 ▼
L. Pinol, S. Renaux-Petel, 多田祐一郎
2017年9月12–15日 @ 宇都宮大学
口頭, 査読なし

2016

日本物理学会秋季大会
超重力ニューインフレーションにおける原始ブラックホール形成
川崎雅裕, A. Kusenko, 多田祐一郎, 柳田勉
2016年9月 @ 宮崎大学
口頭, 査読なし

松江素粒子物理学研究会
Can massive primordial black holes be produced in mild waterfall hybrid inflation?
川崎雅裕, 多田祐一郎
2016年3月 @ 島根大学
口頭, 招待

2015

日本物理学会秋季大会
超対称ハイブリッドインフレーションでの原始ブラックホール形成
川崎雅裕, 多田祐一郎
2015年9月 @ 大阪市立大学
口頭, 査読なし

日本物理学会第70回年次大会
バイアス効果による原始ブラックホール暗黒物質への制限
多田祐一郎, 横山修一郎
2015年3月 @ 早稲田大学
口頭, 査読なし

2014

日本物理学会秋季大会
ストカスティック-δN形式による曲率ゆらぎへの非摂動的アプローチ
藤田智弘, 川崎雅裕, 多田祐一郎
2014年9月 @ 佐賀大学
口頭, 査読なし

2013

日本物理学会秋季大会
ストカスティック効果を用いたインフレーションのゆらぎの解析
藤田智弘, 川崎雅裕, 多田祐一郎, 竹迫知博
2013年9月 @ 高知大学
口頭, 査読なし


Seminars

2024

豊西総合大学
— 星が先かブラックホールが先か &mdash
原始ブラックホール研究の最前線 ▼

多田祐一郎
2024年11月14日 @ 豊田西高校
招待講演

A Complete Guide to Primordial Black Holes ▼
Y. Tada
27th May 2024 @ UTokyo
25th June 2024 @ BNU

Cancellation of quantum corrections on the soft curvature perturbations ▼
Y. Tada, T. Terada, J. Tokuda
21th February 2024 @ CERN

2023

Cancellation of quantum corrections on the soft curvature perturbations ▼
Y. Tada, T. Terada, J. Tokuda,
22nd November 2023 @ ICG (online)

Nano-Hertz stochastic gravitational wave background ▼
Y. Tada
17th October 2023 @ E-lab, Nagoya U.

Stochastic approach to the inflationary universe ▼
Y. Tada
26th May 2023 @ CTP, invited
31st May 2023 @ IBS
13th June 2023 @ LMU
27th June 2023 @ LPENS
14th July 2023 @ Waseda

2022

原始ブラックホールのピーク理論と非ガウス尾 ▼
多田祐一郎
2022年6月7日 @ 立教大, 招待

YLC seminar
Frontier of primordial black hole research — star first or black hole first? —
Y. Tada
22nd March 2022 @ Nagoya U. (online), invited

2021

名大発アカデミックフラッシュ 第2報
宇宙の「インフレ」と「金融工学」
多田祐一郎
2021年9月3日 @ オンライン, 招待

名古屋大学・名古屋市科学館 公開オンラインセミナー
星が先かブラックホールが先か?原始ブラックホール研究の最前線
多田祐一郎
2021年8月22日 @ オンライン, 招待

Self-introduction,
or a biased view of what theoretical cosmologists are recently interested in ▼

Y. Tada
25th May 2021 @ E-lab, Nagoya U. (online), invited

2020

インフレーションの確率形式に対する共変な定式化 ▼
L. Pinol, S. Renaux-Petel, 多田祐一郎, V. Vennin
2020年11月12日 @ 駒場素粒子研, 東大 (online), 招待

Manifestly covariant theory of stochastic inflation ▼
L. Pinol, S. Renaux-Petel, Y. Tada, and V. Vennin
11th November 2020 @ Padova (online)

JGRG Webinar Series
A manifestly covariant theory of multifield stochastic inflation in phase space ▼
L. Pinol, S. Renaux-Petel, and Y. Tada
22nd October 2020 @ online, invited

Manifestly covariant theory of stochastic inflation ▼
L. Pinol, S. Renaux-Petel, Y. Tada, and V. Vennin
20th October 2020 @ KEK (online)

Manifestly covariant theory of stochastic inflation ▼
L. Pinol, S. Renaux-Petel, Y. Tada, and V. Vennin
7th October 2020 @ IBS (online), invited

2019

Aspects of primordial black holes and implication to multi-phase inflation ▼
K. Inomata, M. Kawasaki, A. Kusenko, K. Mukaida, Y. Tada, T. T. Yanagida, and S. Yokoyama
7th June 2019 @ IRAP

Aspects of primordial black holes and implication to multi-phase inflation ▼
K. Inomata, M. Kawasaki, A. Kusenko, K. Mukaida, Y. Tada, T. T. Yanagida, and S. Yokoyama
23rd May 2019 @ Tohoku U., invited

2018

一般的場空間におけるストカスティックインフレーション ▼
藤田智弘, L. Pinol, S. Renaux-Petel, 多田祐一郎, 徳田順生
2018年10月9日 @ 立教大学, 招待

Stochastic inflation in a general field space ▼
T. Fujita, L. Pinol, S. Renaux-Petel, Y. Tada, and J. Tokuda
26th June 2018 @ APC

2017

Stochastic Formalism in Curved Field Space ▼
L. Pinol, S. Renaux-Petel, and Y. Tada
4th September 2017 @ RESCEU
19th September 2017 @ Kobe U.
20th September 2017 @ Nagoya U.

Primordial Black Hole, Dark Matter, and LIGO's Gravitational Wave Event ▼
K. Inomata, M. Kawasaki, A. Kusenko, K. Mukaida, Y. Tada, and T. T. Yanagida
20th April 2017 @ IAP

2016

Primordial Black Hole, Dark Matter, and LIGO's Gravitational Wave Event
K. Inomata, M. Kawasaki, A. Kusenko, K. Mukaida, Y. Tada, and T. T. Yanagida
16th December 2016 @ Waseda U., invited

Stochastic-delta N formalism and massive primordial black hole formation in hybrid inflation
M. Kawasaki and Y. Tada
22nd June 2016 @ ICG, University of Portsmouth

Stochastic-delta N formalism and massive primordial black hole formation in hybrid inflation
M. Kawasaki and Y. Tada
20th June 2016 @ University of Sussex
CANCELLED

Stochastic-delta N formalism and massive primordial black holes in hybrid inflation
M. Kawasaki and Y. Tada
18th April 2016 @ UT hep-th, invited

Stochastic-delta N formalism and massive primordial black holes in hybrid inflation
M. Kawasaki and Y. Tada
29th March 2016 @ Kyoto

Can massive primordial black holes be produced in mild waterfall hybrid inflation?
M. Kawasaki and Y. Tada
29th February 2016 @ RESCEU, invited

Stochastic-delta N formalism and massive primordial black holes in hybrid inflation
M. Kawasaki and Y. Tada
27th January 2016 @ KEK

2015

Stochastic-deltaN formalism and primordial black holes in hybrid inflation
M. Kawasaki and Y. Tada
14th–18th & 21st September 2015 @ Padova & IAP

バイアストレーサーとしての原始ブラックホール
多田祐一郎, 横山修一郎
2015年6月25日 @ 名古屋大学 Cセミナー

Joint seminar of gravity and cosmology
Primordial black holes as biased tracers
Y. Tada and S. Yokoyama
16th February 2015 @ IPMU
materials

2014

Stochastic-δN formalism
T. Fujita, M. Kawasaki, Y. Tada, and T. Takesako
19th–24th August 2014 @ Helsinki U.

Activities

Study Abroad

Prof. Kari Enqvist's group, University of Helsinki 1st October–22nd December 2014
ALPS course work

Peer Review

Classical and Quantum Gravity (CQG)
European Physical Journal C (EPJC)
Journal of Cosmology and Astroparticle Physics (JCAP)
Monthly Notices of the Royal Astronomical Society (MNRAS)
Modern Physics Letters A (MPLA)
Physical Review D (PRD)
Physical Review Letters (PRL)
Progress of Theoretical and Experimental Physics (PTEP)
Universe

Science Member

Physics meets Mathematics (PI)
International Research Network Extragalactic astrophysics and Cosmology (NECO)
理論天文学宇宙物理学懇談会
日本物理学会

Conference Organisation

"Physics meets Mathematics" まとめ合宿 10–12th February 2024
JGRG 32 27th November–1st December 2023

Outreach

名大発アカデミックフラッシュ 第2報
宇宙の「インフレ」と「金融工学」
多田祐一郎
2021年9月3日 @ オンライン, 招待

名古屋大学・名古屋市科学館 公開オンラインセミナー
星が先かブラックホールが先か?原始ブラックホール研究の最前線
多田祐一郎
2021年8月22日 @ オンライン, 招待

Materials

C++ workshop

Awards

CQG 2019–20 Highlights

Inflationary stochastic anomalies
L. Pinol, S. Renaux-Petel and Y. Tada
Class. Quant. Grav. 36, no. 7, 07LT01 (2019) [arXiv: 1806.10126 [gr-qc]].

EPL 2020 Highlights

Conformal inflation in the metric-affine geometry
Y. Mikura, Y. Tada and S. Yokoyama
EPL 132, no.3, 39001 (2020) [arXiv: 2008.00628 [hep-th]].

Outstanding Presentation Award Gold Prize

Online JGRG Workshop 2020 27th November 2020
Manifestly covariant theory of stochastic inflation (poster) ▼
L. Pinol, S. Renaux-Petel, and Y. Tada

Young Representative Speaker

FAPESP-JSPS Workshop on dark energy, dark matter, and galaxies February 2019
Aspects of primordial black hole as dark matter (oral)
K. Inomata, M. Kawasaki, A. Kusenko, K. Mukaida, Y. Tada, T. T. Yanagida, and S. Yokoyama

Director's Award

ICRR Master and Doctor Thesis Workshop 24th February 2017

ポスターアワード1位

天文・天体物理若手夏の学校 2015年7月30日

ポスターアワード1位

天文・天体物理若手夏の学校 2013年8月1日

Funding

Stochastic lattice simulation of the inflationary universe

JSPS Grant-in-Aid for Scientific Research (C) 1st April 2024–31st March 2027
No. 24K07047, Principal Investigator, ¥4,550,000.

Physics meets Mathematics

2023 Collaborative Research Grants for YLC 1st July 2023–31st March 2024
Principal Investigator, ¥1,000,000.

Inflationary universe in light of stochastic calculus, primordial black holes, and gravitational waves

JSPS Grant-in-Aid for Early-Career Scientists 1st April 2021–31st March 2024
No. 21K13918, Principal Investigator, ¥4,680,000.

Aspects of gravity and quantum theory in the stochastic formalism

JSPS Grant-in-Aid for Early-Career Scientists 1st April 2019–31st March 2022
No. 19K14707, Principal Investigator, ¥1,560,000.

Curvature Perturbations and Primordial Black Hole Formation in the Inflationary Universe

Grant-in-Aid for JSPS Fellows 25th April 2018–31st March 2021
No. 18J01992, JSPS Fellow (PD), ¥3,640,000.

小スケール曲率ゆらぎの観測とインフレーション

Grant-in-Aid for JSPS Fellows 24th April 2015–31st March 2017
No. 15J10829, JSPS Fellow (DC2), ¥1,900,000.

Get In Touch.

Address & Phone

Yuichiro Tada
ES bldg. 604, Nagoya University
Furocho Chikusaku Nagoya
Aichi 464-8602 Japan
+81 (0)80-9566-9181

Email

yuichiro.t.tada@gmail.com
tada.yuichiro.y8@f.mail.nagoya-u.ac.jp

tada.yuichiro@e.mbox.nagoya-u.ac.jp
tada_at_iap.fr
yuichiro.tada_at_ipmu.jp