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CERN Document Server Znaleziono 91 rekordów  1 - 10następnykoniec  skocz do rekordu: Szukanie trwało 0.68 sekund. 
1.
4D de Sitter from String Theory via 6D Supergravity / Burgess, C.P. (McMaster U. ; Perimeter Inst. Theor. Phys. ; Dublin Inst.) ; Muia, F. (Cambridge U., DAMTP) ; Quevedo, F. (Cambridge U., DAMTP ; CERN ; New York U., Abu Dhabi)
We obtain de Sitter (dS) solutions from controlled string-theory constructions. [...]
CERN-TH-2024-107 ; arXiv:2408.03852. - 41 p.
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2.
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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3.
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: document - PDF; 2301.00549 - PDF;
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4.
Gravity, Horizons and Open EFTs / Burgess, C.P. (McMaster U. ; Perimeter Inst. Theor. Phys. ; CERN ; Dublin Inst.) ; Kaplanek, Greg (Imperial Coll., London)
Wilsonian effective theories exploit hierarchies of scale to simplify the description of low-energy behaviour and play as central a role for gravity as for the rest of physics. [...]
arXiv:2212.09157 ; CERN-TH-2022-175; Imperial/TP/2022/GK/03 ; CERN-TH-2022-175 ; Imperial/TP/2022/GK/03. - 52 p.
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5.
Minimal decoherence from inflation / Burgess, C.P. (McMaster U. ; Perimeter Inst. Theor. Phys. ; CERN ; Dublin Inst.) ; Holman, R. (Minerva Schools, SF) ; Kaplanek, Greg (McMaster U. ; Perimeter Inst. Theor. Phys. ; Imperial Coll., London) ; Martin, Jerome (Paris, Inst. Astrophys.) ; Vennin, Vincent (LPENS, Paris ; APC, Paris)
We compute the rate with which super-Hubble cosmological fluctuations are decohered during inflation, by their gravitational interactions with unobserved shorter-wavelength scalar and tensor modes. We do so using Open Effective Field Theory methods, that remain under control at the late times of observational interest, contrary to perturbative calculations. [...]
arXiv:2211.11046; CERN-TH-2022-174; Imperial/TP/2022/GK/02.- 2023-07-07 - 31 p. - Published in : JCAP 2307 (2023) 022 Fulltext: 2211.11046 - PDF; document - PDF;
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6.
RG-induced modulus stabilization: perturbative de Sitter vacua and improved D3-$ \overline{\mathrm{D}3} $ inflation / Burgess, C.P. (McMaster U. ; Perimeter Inst. Theor. Phys. ; CERN) ; Quevedo, F. (Cambridge U., DAMTP)
We propose a new mechanism that adapts to string theory a perturbative method for stabilizing moduli without leaving the domain of perturbative control, thereby evading the `Dine-Seiberg' problem. The only required nonperturbative information comes from the standard renormalization-group resummation of leading logarithms that allow us simultaneously to work to a fixed order in the perturbative parameter $\alpha$ and to all orders in $\alpha \ln\tau$ where $\tau$ is a large extra-dimensional modulus. [...]
arXiv:2202.05344; CERN-TH-2022-009.- 2022-06-30 - 48 p. - Published in : JHEP 2206 (2022) 167 Fulltext: 2202.05344 - PDF; document - PDF;
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7.
Yoga Dark Energy: Natural Relaxation and Other Dark Implications of a Supersymmetric Gravity Sector / Burgess, C.P. (McMaster U. ; Perimeter Inst. Theor. Phys. ; CERN) ; Dineen, Danielle (McMaster U.) ; Quevedo, F. (Cambridge U., DAMTP)
We construct a class of 4D `yoga' (naturally relaxed) models for which the gravitational response of heavy-particle vacuum energies is strongly suppressed. The models contain three ingredients: (i) a relaxation mechanism, (ii) a very supersymmetric gravity sector coupled to matter for which supersymmetry is non-linearly realised, and (iii) an accidental approximate scale invariance expressed through the presence of a low-energy dilaton supermultiplet. [...]
arXiv:2111.07286; CERN-TH-2021-192.- 2022-03-30 - 69 p. - Published in : JCAP 2203 (2022) 064 Fulltext: PDF;
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8.
Beyond the standard model effective field theory with $B \rightarrow c \tau^- \overline{\nu}$ / Burgess, C.P. (McMaster U. ; Perimeter Inst. Theor. Phys. ; CERN) ; Hamoudou, Serge (Montreal U.) ; Kumar, Jacky (Montreal U. ; TUM-IAS, Munich) ; London, David (Montreal U.)
Electroweak interactions assign a central role to the gauge group $SU(2)_L \times U(1)_Y$, which is either realized linearly (SMEFT) or nonlinearly (e.g., HEFT) in the effective theory obtained when new physics above the electroweak scale is integrated out. Although the discovery of the Higgs boson has made SMEFT the default assumption, nonlinear realization remains possible. [...]
arXiv:2111.07421; UdeM-GPP-TH-21-290.- 2022-04-01 - 7 p. - Published in : Phys. Rev. D 105 (2022) 073008 Fulltext: PhysRevD.105.073008 - PDF; 2111.07421 - PDF;
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9.
Who's Afraid of the Supersymmetric Dark? The Standard Model vs Low-Energy Supergravity / Burgess, C.P. ; Quevedo, Fernando
Use of supergravity equations in astronomy and late-universe cosmology is often criticized on three grounds: ($i$) phenomenological success usually depends on the supergravity form for the scalar potential applying at the relevant energies; ($ii$) the low-energy scalar potential is extremely sensitive to quantum effects involving very massive particles and so is rarely well-approximated by classical calculations of its form; and ($iii$) almost all Standard Model particles count as massive for these purposes and none of these are supersymmetric. [...]
CERN-TH-2021-177. - 2021. - 28.
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10.
Axion homeopathy: screening dilaton interactions / Burgess, C.P. (McMaster U. ; Perimeter Inst. Theor. Phys. ; CERN) ; Quevedo, F. (Cambridge U., DAMTP)
Cosmologically active Brans-Dicke (or dilaton) scalar fields are generically ruled out by solar system tests of gravity unless their couplings to ordinary matter are much suppressed relative to gravitational strength, and this is a major hindrance when building realistic models of light dilatons coupled to matter. We propose a new mechanism for evading such bounds if matter also couples to a light axion, that exploits nonlinear target-space curvature interactions to qualitatively change how the fields respond to a gravitating source. [...]
arXiv:2110.10352; CERN-TH-2021-176.- Geneva : CERN, 2022-04-05 - 24 p. - Published in : JCAP 2204 (2022) 007 Fulltext: 2110.10352 - PDF; CERN-TH-2021-176 - PDF;
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CERN Document Server : Znaleziono 91 rekordów   1 - 10następnykoniec  skocz do rekordu:
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