DSpace Community:http://hdl.handle.net/10261/492024-03-19T11:12:59Z2024-03-19T11:12:59ZThe trap in the early Universe: impact on the interplay between gravitational waves and LHC physics in the 2HDMBiekötter, ThomasHeinemeyer, SvenNo, José MiguelOlea-Romacho, María OlallaWeiglein, Georghttp://hdl.handle.net/10261/3504882024-03-18T21:49:35Z2024-03-14T15:15:52ZTítulo: The trap in the early Universe: impact on the interplay between gravitational waves and LHC physics in the 2HDM
Autor: Biekötter, Thomas; Heinemeyer, Sven; No, José Miguel; Olea-Romacho, María Olalla; Weiglein, Georg
Resumen: We analyze the thermal history of the 2HDM and determine the parameter regions featuring a first-order electroweak phase transition (FOEWPT) and also much less studied phenomena like high-temperature electroweak (EW) symmetry non-restoration and the possibility of vacuum trapping (i.e. the Universe remains trapped in an EW-symmetric vacuum throughout the cosmological evolution, despite at T = 0 the EW breaking vacuum is deeper). We show that the presence of vacuum trapping impedes a first-order EW phase transition in 2HDM parameter-space regions previously considered suitable for the realization of electroweak baryogenesis. Focusing then on the regions that do feature such a first-order transition, we show that the 2HDM parameter space that would yield a stochastic gravitational wave signal potentially detectable by the future LISA observatory is very contrived, and will be well probed by direct searches of 2HDM Higgs bosons at the HL-LHC, and (possibly) also via measurements of the self-coupling of the Higgs boson at 125 GeV. This has an important impact on the interplay between LISA and the LHC regarding the exploration of first-order phase transition scenarios in the 2HDM: the absence of new physics indications at the HL-LHC would severely limit the prospects of a detection by LISA. Finally, we demonstrate that as a consequence of the predicted enhancement of the self-coupling of the Higgs boson at 125 GeV the ILC would be able to probe the majority of the 2HDM parameter space yielding a FOEWPT through measurements of the self-coupling, with a large improvement in precision with respect to the HL-LHC.2024-03-14T15:15:52ZThree-dimensional hypergravity theories and semigroup expansion methodCaroca, RicardoConcha, PatrickMatulich, JavierRodríguez, EvelynTempo, Davidhttp://hdl.handle.net/10261/3504522024-03-15T21:50:54Z2024-03-14T12:28:17ZTítulo: Three-dimensional hypergravity theories and semigroup expansion method
Autor: Caroca, Ricardo; Concha, Patrick; Matulich, Javier; Rodríguez, Evelyn; Tempo, David
Resumen: In this work, we apply the semigroup expansion method of Lie algebras to construct novel and known three-dimensional hypergravity theories. We show that the expansion procedure considered here yields a consistent way of coupling different three-dimensional Chern-Simons gravity theories with massless spin- 52 gauge fields. First, by expanding the osp (1|4) superalgebra with a particular semigroup a generalized hyper-Poincaré algebra is found. Interestingly, the hyper-Poincaré and hyper-Maxwell algebras appear as subalgebras of this generalized hypersymmetry algebra. Then, we show that the generalized hyper-Poincaré CS gravity action can be written as a sum of diverse hypergravity CS Lagrangians. We extend our study to a generalized hyper-AdS gravity theory by considering a different semigroup. Both generalized hyperalgebras are then found to be related through an Inönü-Wigner contraction which can be seen as a generalization of the existing vanishing cosmological constant limit between the hyper-AdS and hyper-Poincaré gravity theories.2024-03-14T12:28:17ZThe Emergence Proposal in Quantum Gravity and the Species ScaleAlberto CastellanoAlvaro HerráezLuis E. Ibáñezhttp://hdl.handle.net/10261/3504422024-03-15T21:50:16Z2024-03-14T11:45:15ZTítulo: The Emergence Proposal in Quantum Gravity and the Species Scale
Autor: Alberto Castellano; Alvaro Herráez; Luis E. Ibáñez
Resumen: In the Emergence Proposal in QG it is conjectured that all light-particle
kinetic terms are absent in the fundamental UV theory and are generated by
quantum corrections in the IR. It has been argued that this may provide for
some microscopic understanding of the WGC and SDC. In the present paper we take
the first steps towards a systematic study of Emergence in the context of
string theory. We emphasize the crucial role of the species scale in any EFT
coupled to gravity, and discuss its computation in string theory and general
systems with light towers of states. We then introduce the notion of Emergence
and show how kinetic terms for moduli, gauge bosons and fermions may be
generated. One-loop computations play an important role in Emergence, so we
present detailed calculations in $d$ spacetime dimensions for the wave-function
renormalization of scalars, vectors and fermions. We extend and check the
Emergence Proposal in a number string vacua, including 4d $\mathcal{N}=2$
theories arising from type IIA on a CY$_3$, where the towers at strong coupling
are comprised by D0 and (wrapped) D2-branes, and also elaborate on how
instanton corrections would fit within the emergence picture. Higher
dimensional examples are also discussed, including 6d and 7d models arising
from F-/M-theory on an elliptic CY$_3$ or a $K3$ surface. We also consider 10d
string theories and study in some detail the emergence mechanism in type IIA.
We show as well how the flux potential in 4d may be obtained from the emergence
prescription, by analyzing the corresponding decompactification limits to
M-theory. We find that the required kinetic terms for the dual 3-form fields
can arise upon integrating out towers of massive gravitini (and bosonic
superpartners). Our analysis renders support to the Emergence Proposal, and to
the idea that infinite distance singularities may arise in QG as an intrinsic
IR phenomenon.
Descripción: v2: minor changes and typos corrected. 79 pages + Appendices, 11
figures, 8 tables2024-03-14T11:45:15ZThe desert and the swamplandLong, CodyMontero, MiguelVafa, CumrunValenzuela, Irenehttp://hdl.handle.net/10261/3504342024-03-15T02:49:24Z2024-03-14T11:20:46ZTítulo: The desert and the swampland
Autor: Long, Cody; Montero, Miguel; Vafa, Cumrun; Valenzuela, Irene
Resumen: The most natural expectation away from asymptotic limits in moduli space of supergravity theories is the desert scenario, where there are few states between massless fields and the quantum gravity cutoff. In this paper we initiate a systematic study of these regions deep in the moduli space, and use it to place a bound on the number of massless modes by relating it to the black hole species problem. There exists a consistent sub-Planckian UV cutoff (the species scale) which resolves the black hole species problem without bounding the number of light modes. We reevaluate this in the context of supersymmetric string vacua in the desert region and show that even though heuristically the species scale is compatible with expectations, the BPS states of the actual string vacua lead to a stronger dependence of the cutoff scale on the number of massless modes. We propose that this discrepancy, which can be captured by the “BPS desert conjecture”, resurrects the idea of a uniform bound on the number of light modes as a way to avoid the black hole species problem. This conjecture also implies a stronger form of the Tadpole Conjecture, which leads to an obstruction in stabilizing all moduli semi-classically for large number of moduli in flux compactifications.2024-03-14T11:20:46Z