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Challenges and Opportunities of Gravitational Wave Searches above 10 kHz
/ Aggarwal, Nancy (Northwestern U.) ; Aguiar, Odylio D. (Sao Jose, INPE) ; Blas, Diego (Barcelona, IFAE ; ICREA, Barcelona) ; Bauswein, Andreas (Darmstadt, GSI) ; Cella, Giancarlo (INFN, Pisa) ; Clesse, Sebastian (Brussels U.) ; Cruise, Adrian Michael (Birmingham U.) ; Domcke, Valerie (CERN) ; Ellis, Sebastian (Geneva U.) ; Figueroa, Daniel G. (Valencia U., IFIC) et al.
The first direct measurement of gravitational waves by the LIGO and Virgo collaborations has opened up new avenues to explore our Universe. [...]
arXiv:2501.11723 ; CERN-TH-2025-014 ; DESY-25-007.
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138.
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Back to the origins of brane-antibrane inflation
/ Cicoli, Michele (Bologna U. ; INFN, Bologna) ; Hughes, Christopher (Cambridge U., DAMTP) ; Kamal, Ahmed Rakin (Masaryk U., Brno ; Brac U.) ; Francesco Marino (Bologna U.) ; Quevedo, Fernando (Cambridge U., DAMTP ; CERN ; New York U., Abu Dhabi) ; Ramos-Hamud, Mario (Cambridge U., DAMTP) ; Villa, Gonzalo (Cambridge U., DAMTP)
We study a new framework for brane-antibrane inflation where moduli stabilisation relies purely on perturbative corrections to the effective action. This guarantees that the model does not suffer from the eta-problem. [...]
arXiv:2410.00097; CERN-TH-2024-128.-
2025 - 37 p.
- Published in : Eur. Phys. J. C 85 (2025) 315
Fulltext: 2410.00097 - PDF; document - PDF;
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Gravitational Waves from High Temperature Strings
/ Frey, Andrew R. (Winnipeg U.) ; Mahanta, Ratul (Winnipeg U.) ; Maharana, Anshuman (Harish-Chandra Res. Inst.) ; Quevedo, Fernando (Cambridge U., DAMTP ; CERN ; New York U., Abu Dhabi) ; Villa, Gonzalo (Cambridge U., DAMTP)
We study finite temperature effects in string cosmology and their potential gravitational wave signature. Expanding on our recent work arXiv:2310.11494 , we consider a general configuration of highly excited open and closed strings at high enough temperature to be in the Hagedorn phase in 3+1 dimensions, in order to explore its cosmological implications. [...]
arXiv:2408.13803; CERN-TH-2024-108.-
2024-12-23 - 41 p.
- Published in : JHEP 2412 (2024) 174
Fulltext: 2408.13803 - PDF; document - PDF;
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Personal reminiscences of Steven Weinberg
/ Quevedo, Fernando (Cambridge U., DAMTP ; CERN)
My personal recollections are presented regarding my interactions with Steven Weinberg and the impact he had in my career from when I was his graduate student until the present..
arXiv:2407.10033; CERN-TH-2024-105.-
2024-07-06 - 6 p.
Fulltext: PDF;
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On Quantum Transitions and the String Landscape
/ Quevedo, Fernando (speaker) (University of Cambridge)
A brief overview of string cosmology and moduli stabilisation is presented, followed by a discussion of vacuum transitions in gravitational theories and their potential implications for the string landscape..
2024 - 4246.
Theory Colloquia
External link: Event details
In : On Quantum Transitions and the String Landscape
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Light Axiodilatons: Matter Couplings, Weak-Scale Completions and Long-Distance Tests of Gravity
/ Brax, Philippe (IPhT, Saclay ; CERN) ; Burgess, C.P. (CERN ; McMaster U. ; Perimeter Inst. Theor. Phys. ; Dublin Inst.) ; Quevedo, F. (Cambridge U., DAMTP)
We consider the physical implications of very light axiodilatons motivated by a novel mechanism to substantially reduce the vacuum energy proposed in arXiv:2110.10352. We address the two main problems concerning the light axiodilaton that appears in the low-energy limit, namely that the axion has a very low decay constant $f_a \sim $ eV (as read from its kinetic term) and that the dilaton is subject to bounds that are relevant to tests of GR once $\rho_{\rm vac} \leq 10^{-80} M_p^4$. [...]
arXiv:2212.14870.-
2023-08-10 - 39 p.
- Published in : JCAP 2308 (2023) 011
Fulltext: document - PDF; 2212.14870 - PDF;
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EuCAPT White Paper: Opportunities and Challenges for Theoretical Astroparticle Physics in the Next Decade
/ Alves Batista, R. (Madrid, IFT) ; Amin, M.A. (Rice U.) ; Barenboim, G. (Valencia U.) ; Bartolo, N. (U. Padua, Dept. Phys. Astron.) ; Baumann, D. (Amsterdam U. ; U. Amsterdam, GRAPPA ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Bauswein, A. (Darmstadt, GSI) ; Bellini, E. (Geneva U., Dept. Theor. Phys.) ; Benisty, D. (Cambridge U., DAMTP ; Cambridge U., KICC ; Cambridge U., Inst. of Astron.) ; Bertone, G. (Amsterdam U. ; U. Amsterdam, GRAPPA) ; Blasi, P. (GSSI, Aquila ; Gran Sasso) et al.
Astroparticle physics is undergoing a profound transformation, due to a series of extraordinary new results, such as the discovery of high-energy cosmic neutrinos with IceCube, the direct detection of gravitational waves with LIGO and Virgo, and many others. [...]
arXiv:2110.10074.
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UV and IR Effects in Axion Quality Control
/ Burgess, C.P. (McMaster U. ; Perimeter Inst. Theor. Phys.) ; Choi, Gongjun (CERN) ; Quevedo, F. (Cambridge U., DAMTP)
Motivated by recent discussions and the absence of exact global symmetries in UV completions of gravity we re-examine the axion quality problem (and naturalness issues more generally) using antisymmetric Kalb-Ramond (KR) fields rather than their pseudoscalar duals, as suggested by string and higher dimensional theories. Two types of axions can be identified: a model independent $S$-type axion dual to a two form $B_{\mu\nu}$ in 4D and a $T$-type axion coming directly as 4D scalar Kaluza-Klein (KK) components of higher-dimensional tensor fields. [...]
arXiv:2301.00549; CERN-TH-2022-176.-
2024-03-08 - 28 p.
- Published in : JHEP 2403 (2024) 051
Fulltext: 2301.00549 - PDF; document - PDF;
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